Articles | Volume 20, issue 1
https://doi.org/10.5194/os-20-123-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-20-123-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
02 Feb 2024
Research article |
| 02 Feb 2024
| 02 Feb 2024
Water properties and bottom water patterns in hadal trench environments
Minderoo-UWA Deep-Sea Research Centre, University of Western Australia, Crawley, 6009, Australia
School of Mathematics and Statistics, University of New South Wales, Sydney, 2052, Australia
Charitha Pattiaratchi
Oceans Graduate School, University of Western Australia, Crawley, 6009, Australia
Alan Jamieson
Minderoo-UWA Deep-Sea Research Centre, University of Western Australia, Crawley, 6009, Australia
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Jan D. Zika and Taimoor Sohail
Geosci. Model Dev., 17, 8049–8068, https://doi.org/10.5194/gmd-17-8049-2024, https://doi.org/10.5194/gmd-17-8049-2024, 2024
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We describe a method to relate fluxes of heat and freshwater at the sea surface to the resulting distribution of seawater among categories such as warm and salty or cold and salty. The method exploits the laws that govern how heat and salt change when water mixes. The method will allow the climate community to improve estimates of how much heat the ocean is absorbing and how rainfall and evaporation are changing across the globe.
Sharani Kodithuwakku, Charitha Pattiaratchi, Simone Cosoli, and Yasha Hetzel
EGUsphere, https://doi.org/10.5194/egusphere-2024-2901, https://doi.org/10.5194/egusphere-2024-2901, 2024
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Mesoscale eddies are rotating structures in the ocean. This study investigates the surface and subsurface characteristics of mesoscale eddies in the vicinity of Perth submarine canyon off the southwest coast of Western Australia using Ocean Gliders. Eight Seaglider missions that intersected eddies revealed nine distinct vertical structures, comprising four cyclonic and five anti-cyclonic eddies. There was upwelling in cyclonic eddies and downwelling in anti-cyclonic eddies.
Neill Mackay, Taimoor Sohail, Jan David Zika, Richard G. Williams, Oliver Andrews, and Andrew James Watson
Geosci. Model Dev., 17, 5987–6005, https://doi.org/10.5194/gmd-17-5987-2024, https://doi.org/10.5194/gmd-17-5987-2024, 2024
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The ocean absorbs carbon dioxide from the atmosphere, mitigating climate change, but estimates of the uptake do not always agree. There is a need to reconcile these differing estimates and to improve our understanding of ocean carbon uptake. We present a new method for estimating ocean carbon uptake and test it with model data. The method effectively diagnoses the ocean carbon uptake from limited data and therefore shows promise for reconciling different observational estimates.
Jessica Kolbusz, Tim Langlois, Charitha Pattiaratchi, and Simon de Lestang
Biogeosciences, 19, 517–539, https://doi.org/10.5194/bg-19-517-2022, https://doi.org/10.5194/bg-19-517-2022, 2022
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Western rock lobster larvae spend up to 11 months in offshore waters before ocean currents and their ability to swim transport them back to the coast. In 2008, there was a reduction in the number of puerulus (larvae) settling into the fishery. We use an oceanographic model to see how the environment may have contributed to the reduction. Our results show that a combination of effects from local currents and a widespread quiet period in the ocean off WA likely led to less puerulus settlement.
Charitha Pattiaratchi, Mirjam van der Mheen, Cathleen Schlundt, Bhavani E. Narayanaswamy, Appalanaidu Sura, Sara Hajbane, Rachel White, Nimit Kumar, Michelle Fernandes, and Sarath Wijeratne
Ocean Sci., 18, 1–28, https://doi.org/10.5194/os-18-1-2022, https://doi.org/10.5194/os-18-1-2022, 2022
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The Indian Ocean receives a large proportion of plastics, but very few studies have addressed the sources, transport pathways, and sinks. There is a scarcity of observational data for the Indian Ocean. Most plastic sources are derived from rivers, although the amount derived from fishing activity (ghost nets, discarded ropes) is unknown. The unique topographic features of the Indian Ocean that create the monsoons and reversing currents have a large influence on the transport and sinks.
Mirjam van der Mheen, Erik van Sebille, and Charitha Pattiaratchi
Ocean Sci., 16, 1317–1336, https://doi.org/10.5194/os-16-1317-2020, https://doi.org/10.5194/os-16-1317-2020, 2020
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A large percentage of global ocean plastic enters the Indian Ocean through rivers, but the fate of these plastics is generally unknown. In this paper, we use computer simulations to show that floating plastics
beachand end up on coastlines throughout the Indian Ocean. Coastlines where a lot of plastic enters the ocean are heavily affected by beaching plastic, but plastics can also beach far from the source on remote islands and countries that contribute little plastic pollution of their own.
Jan D. Zika, Jean-Baptiste Sallée, Andrew J. S. Meijers, Alberto C. Naveira-Garabato, Andrew J. Watson, Marie-Jose Messias, and Brian A. King
Ocean Sci., 16, 323–336, https://doi.org/10.5194/os-16-323-2020, https://doi.org/10.5194/os-16-323-2020, 2020
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The ocean can regulate climate by distributing heat and carbon dioxide into its interior. This work has resulted from a major experiment aimed at understanding how that distribution occurs. In the experiment an artificial tracer was released into the ocean. After release the tracer was tracked as it was distorted by ocean currents. Using novel methods we reveal how the tracer's distortions follow the movement of the underlying water masses in the ocean and we estimate the rate at which it mixes.
Miaoju Chen, Charitha B. Pattiaratchi, Anas Ghadouani, and Christine Hanson
Ocean Sci., 15, 333–348, https://doi.org/10.5194/os-15-333-2019, https://doi.org/10.5194/os-15-333-2019, 2019
Julie A. Trotter, Charitha Pattiaratchi, Paolo Montagna, Marco Taviani, James Falter, Ron Thresher, Andrew Hosie, David Haig, Federica Foglini, Quan Hua, and Malcolm T. McCulloch
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-319, https://doi.org/10.5194/bg-2018-319, 2018
Manuscript not accepted for further review
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The first ROV exploration of the Perth Canyon offshore southwest Australia discovered diverse
hot spotsof deep-sea biota to depths of ~ 2000 m. Some corals were living below the carbonate saturation horizon. Extensive coral graveyards found at ~ 700 and ~ 1700 m are between ~ 18 000 and ~ 30 000 years old, indicating these corals flourished during the last ice age. Anthropogenic carbon detected within the upper ~ 800 m highlights the increasing threat of climate change to deep-sea ecosystems.
Sarik Salim, Charitha Pattiaratchi, Rafael Tinoco, Giovanni Coco, Yasha Hetzel, Sarath Wijeratne, and Ravindra Jayaratne
Earth Surf. Dynam., 5, 399–415, https://doi.org/10.5194/esurf-5-399-2017, https://doi.org/10.5194/esurf-5-399-2017, 2017
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The aim of this paper was to verify the existence of a mean critical velocity concept in terms of turbulent bursting phenomena. Laboratory experiments were undertaken in a unidirectional current flume where an acoustic Doppler velocimeter was used. Results in the laboratory conditions both above and below the measured mean critical velocity highlighted the need to re-evaluate the accuracy of a single time-averaged critical velocity for the initiation of sediment entrainment.
Peter R. Oke, Roger Proctor, Uwe Rosebrock, Richard Brinkman, Madeleine L. Cahill, Ian Coghlan, Prasanth Divakaran, Justin Freeman, Charitha Pattiaratchi, Moninya Roughan, Paul A. Sandery, Amandine Schaeffer, and Sarath Wijeratne
Geosci. Model Dev., 9, 3297–3307, https://doi.org/10.5194/gmd-9-3297-2016, https://doi.org/10.5194/gmd-9-3297-2016, 2016
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The Marine Virtual Laboratory (MARVL) is designed to help ocean modellers hit the ground running. Usually, setting up an ocean model involves a handful of technical steps that time and effort. MARVL provides a user-friendly interface that allows users to choose what options they want for their model, including the region, time period, and input data sets. The user then hits "go", and MARVL does the rest – delivering a "take-away bundle" that contains all the files needed to run the model.
J. Reisser, B. Slat, K. Noble, K. du Plessis, M. Epp, M. Proietti, J. de Sonneville, T. Becker, and C. Pattiaratchi
Biogeosciences, 12, 1249–1256, https://doi.org/10.5194/bg-12-1249-2015, https://doi.org/10.5194/bg-12-1249-2015, 2015
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Subsurface observations of ocean plastics are very scarce but essential for adequate estimates of marine plastic pollution levels. We sampled plastics from the sea surface to a depth of 5m, at 0.5m intervals. Vertical mixing was dependent on sea state and affected the abundance, mass, and sizes of plastic debris floating at the sea surface. This has important implications for studies assessing at-sea plastic load, size distribution, drifting pattern, and impact on marine species and habitats.
A. de Vos, C. B. Pattiaratchi, and E. M. S. Wijeratne
Biogeosciences, 11, 5909–5930, https://doi.org/10.5194/bg-11-5909-2014, https://doi.org/10.5194/bg-11-5909-2014, 2014
S. R. Kularatne, J. Doucette, and C. B. Pattiaratchi
Earth Surf. Dynam. Discuss., https://doi.org/10.5194/esurfd-2-215-2014, https://doi.org/10.5194/esurfd-2-215-2014, 2014
Revised manuscript has not been submitted
Related subject area
Approach: In situ Observations | Properties and processes: Overturning circulation, gyres and water masses
Circulation of Baffin Bay and Hudson Bay waters on the Labrador Shelf and into the subpolar North Atlantic
Continued warming of deep waters in the Fram Strait
Observed change and the extent of coherence in the Gulf Stream system
Anomalous North Pacific subtropical mode water volume and density decrease in a recent stable Kuroshio Extension period from Argo observations
New insights into the eastern subpolar North Atlantic meridional overturning circulation from OVIDE
The Southern Ocean deep mixing band emerges from a competition between winter buoyancy loss and upper stratification strength
Comparing observed and modelled components of the Atlantic Meridional Overturning Circulation at 26° N
Long-term eddy modulation affects the meridional asymmetry of the halocline in the Beaufort Gyre
Technical note: Determining Arctic Ocean halocline and cold halostad depths based on vertical stability
The Iceland–Faroe warm-water flow towards the Arctic estimated from satellite altimetry and in situ observations
Elodie Duyck, Nicholas P. Foukal, and Eleanor Frajka-Williams
EGUsphere, https://doi.org/10.5194/egusphere-2024-2541, https://doi.org/10.5194/egusphere-2024-2541, 2024
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This study uses drifters – instruments that follow surface ocean currents – to investigate the pathways of Arctic origin waters that enter the North Atlantic west of Greenland. It shows that these waters remain close to the coast as they flow around the Labrador Sea, and only spread into the open ocean south of the Labrador Sea. These results contribute to better understanding how the North Atlantic will be affected by additional freshwater from Greenland and the Arctic in the coming decades.
Salar Karam, Céline Heuzé, Mario Hoppmann, and Laura de Steur
Ocean Sci., 20, 917–930, https://doi.org/10.5194/os-20-917-2024, https://doi.org/10.5194/os-20-917-2024, 2024
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A long-term mooring array in the Fram Strait allows for an evaluation of decadal trends in temperature in this major oceanic gateway into the Arctic. Since the 1980s, the deep waters of the Greenland Sea and the Eurasian Basin of the Arctic have warmed rapidly at a rate of 0.11°C and 0.05°C per decade, respectively, at a depth of 2500 m. We show that the temperatures of the two basins converged around 2017 and that the deep waters of the Greenland Sea are now a heat source for the Arctic Ocean.
Helene Asbjørnsen, Tor Eldevik, Johanne Skrefsrud, Helen L. Johnson, and Alejandra Sanchez-Franks
Ocean Sci., 20, 799–816, https://doi.org/10.5194/os-20-799-2024, https://doi.org/10.5194/os-20-799-2024, 2024
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The Gulf Stream system is essential for northward ocean heat transport. Here, we use observations along the path of the extended Gulf Stream system and an observationally constrained ocean model to investigate variability in the Gulf Stream system since the 1990s. We find regional differences in the variability between the subtropical, subpolar, and Nordic Seas regions, which warrants caution in using observational records at a single latitude to infer large-scale circulation change.
Jing Sheng, Cong Liu, Yanzhen Gu, Peiliang Li, Fangguo Zhai, and Ning Zhou
Ocean Sci., 20, 817–834, https://doi.org/10.5194/os-20-817-2024, https://doi.org/10.5194/os-20-817-2024, 2024
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The homogeneous water column, named mode water, retains atmosphere conditions and biogeochemical elements from the deep winter mixed layer and became weaker and warmer in the North Pacific subtropical ocean in 2018–2021 even though the Kuroshio Extension was stable. Locally anomalous east wind transporting warm water to the north and enhanced near-surface stratification hinder the deepening of the winter mixed layer. This study has broad implications for climate change and biogeochemical cycles.
Herlé Mercier, Damien Desbruyères, Pascale Lherminier, Antón Velo, Lidia Carracedo, Marcos Fontela, and Fiz F. Pérez
Ocean Sci., 20, 779–797, https://doi.org/10.5194/os-20-779-2024, https://doi.org/10.5194/os-20-779-2024, 2024
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We study the Atlantic Meridional Overturning Circulation (AMOC) measured between Greenland and Portugal between 1993–2021. We identify changes in AMOC limb volume and velocity as two major drivers of AMOC variability at subpolar latitudes. Volume variations dominate on the seasonal timescale, while velocity variations are more important on the decadal timescale. This decomposition proves useful for understanding the origin of the differences between AMOC time series from different analyses.
Romain Caneill, Fabien Roquet, and Jonas Nycander
Ocean Sci., 20, 601–619, https://doi.org/10.5194/os-20-601-2024, https://doi.org/10.5194/os-20-601-2024, 2024
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In winter, heat loss increases density at the surface of the Southern Ocean. This increase in density creates a mixed layer deeper than 250 m only in a narrow deep mixing band (DMB) located around 50° S. North of the DMB, the stratification is too strong to be eroded, so mixed layers are shallower. The density of cold water is almost not impacted by temperature changes. Thus, heat loss does not significantly increase the density south of the DMB, so no deep mixed layers are produced.
Harry Bryden, Jordi Beunk, Sybren Drijfhout, Wilco Hazeleger, and Jennifer Mecking
Ocean Sci., 20, 589–599, https://doi.org/10.5194/os-20-589-2024, https://doi.org/10.5194/os-20-589-2024, 2024
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There is widespread interest in whether the Gulf Stream will decline under global warming. We analyse 19 coupled climate model projections of the AMOC over the 21st century. The model consensus is that the AMOC will decline by about 40 % due to reductions in northward Gulf Stream transport and southward deep western boundary current transport. Whilst the wind-driven Gulf Stream decreases by 4 Sv, most of the decrease in the Gulf Stream is due to a reduction of 7 Sv in its thermohaline component.
Jinling Lu, Ling Du, and Shuhao Tao
Ocean Sci., 19, 1773–1789, https://doi.org/10.5194/os-19-1773-2023, https://doi.org/10.5194/os-19-1773-2023, 2023
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With the recent developments in observations and reanalysis data in the Beaufort Gyre, we investigate an improved understanding of eddy activity and asymmetrical halocline variability in the upper ocean. The halocline structures on the southern and northern sides of the central gyre have tended to be identical since 2014. The results suggest that enhanced eddy modulation through eddy fluxes influences oceanic stratification, resulting in reduced meridional asymmetry of the halocline.
Enrico P. Metzner and Marc Salzmann
Ocean Sci., 19, 1453–1464, https://doi.org/10.5194/os-19-1453-2023, https://doi.org/10.5194/os-19-1453-2023, 2023
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The Arctic Ocean cold halocline separates the cold surface mixed layer from the underlying warm Atlantic Water, and thus provides a precondition for sea ice formation. Here, we introduce a new method for detecting the halocline base and compare it to two existing methods. We show that the largest differences between the methods are found in the regions that are most prone to a halocline retreat in a warming climate, and we discuss the advantages and disadvantages of the three methods.
Bogi Hansen, Karin M. H. Larsen, Hjálmar Hátún, Steffen M. Olsen, Andrea M. U. Gierisch, Svein Østerhus, and Sólveig R. Ólafsdóttir
Ocean Sci., 19, 1225–1252, https://doi.org/10.5194/os-19-1225-2023, https://doi.org/10.5194/os-19-1225-2023, 2023
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Based on in situ observations combined with sea level anomaly (SLA) data from satellite altimetry, volume as well as heat (relative to 0 °C) transport of the Iceland–Faroe warm-water inflow towards the Arctic (IF inflow) increased from 1993 to 2021. The reprocessed SLA data released in December 2021 represent observed variations accurately. The IF inflow crosses the Iceland–Faroe Ridge in two branches, with retroflection in between. The associated coupling to overflow reduces predictability.
Cited articles
Abernathey, R. P., Cerovecki, I., Holland, P. R., Newsom, E., Mazloff, M., and Talley, L. D.: Water-mass transformation by sea ice in the upper branch of the Southern Ocean overturning, Nat. Geosci., 9, 596–601, https://doi.org/10.1038/ngeo2749, 2016.
Arvapalli., S. R., Bajish, C. C., and Kurian P, J.: Hydrographic observations in the rift valley of Southwest Indian Ridge from 63∘ E–69∘ E, Dynam. Atmos. Oceans, 97, 101284, https://doi.org/10.1016/j.dynatmoce.2022.101284, 2022.
Atmadipoera, A., Molcard, R., Madec, G., Wijffels, S. E., Sprintall, J., Koch-Larrouy, A., Jaya, I., and Supangat, A.: Characteristics and variability of the Indonesian throughflow water at the outflow straits, Deep-Sea Res. Pt. I., 56, 1942–1954, https://doi.org/10.1016/j.dsr.2009.06.004, 2009.
Bai, Y., Zhao, L., Xiao, J., and Lin, S.: Contraction and warming of Antarctic Bottom Water in the Amundsen Sea, Acta Oceanol. Sin., 41, 68–79, https://doi.org/10.1007/s13131-021-1829-8, 2022.
Bayhaqi, A., Iskandar, I., Surinati, D., Budiman, A. S., Wardhana, A. K., Dirhamsyah, Yuan, D., and Lestari, D. O.: Water mass characteristic in the outflow region of the Indonesian throughflow during and post 2016 negative Indian ocean dipole event, IOP Conf. Ser. Earth Environ. Sci., 149, 012053, https://doi.org/10.1088/1755-1315/149/1/012053, 2018.
Beliaev, G. M.: Deep Sea Ocean Trenches and Their Fauna, Nauka Publishing House, Moscow, 255 pp., ISBN 5-02-005276-0, 1989.
Boeira Dias, F., Rintoul, S. R., Richter, O., Galton-Fenzi, B. K., Zika, J. D., Pellichero, V., and Uotila, P.: Sensitivity of simulated water mass transformation on the Antarctic shelf to tides, topography and model resolution, Front. Mar. Sci., 10, 1027704, https://doi.org/10.3389/fmars.2023.1027704, 2023.
Bongiovanni, C., Stewart, H. A., and Jamieson, A. J.: High-resolution multibeam sonar bathymetry of the deepest place in each ocean, Geosci. Data J., 9, 108–123, https://doi.org/10.1002/gdj3.122, 2021.
Campos, E. J. D., van Caspel, M. C., Zenk, W., Morozov, E. G., Frey, D. I., Piola, A. R., Meinen, C. S., Sato, O. T., Perez, R. C., and Dong, S.: Warming Trend in Antarctic Bottom Water in the Vema Channel in the South Atlantic, Geophys. Res. Lett., 48, e2021GL094709, https://doi.org/10.1029/2021GL094709, 2021.
Chinni, V., Singh, S., Bhushan, R., Rengarajan, R., and Sarma, V.: Spatial variability in dissolved iron concentrations in the marginal and open waters of the Indian Ocean, Mar. Chem., 208, 11–28, https://doi.org/10.1016/j.marchem.2018.11.007, 2019.
Choi, Y. and Nam, S.: East–west contrasting changes in Southern Indian Ocean Antarctic Bottom Water salinity over three decades, Sci. Rep., 12, 12175, https://doi.org/10.1038/s41598-022-16331-y, 2022.
Cimoli, L., Mashayek, A., Johnson, H. L., Marshall, D. P., Naveira Garabato, A. C., Whalen, C. B., Vic, C., de Lavergne, C., Alford, M. H., MacKinnon, J. A., and Talley, L. D.: Significance of Diapycnal Mixing Within the Atlantic Meridional Overturning Circulation, AGU Adv., 4, e2022AV000800, https://doi.org/10.1029/2022AV000800, 2023.
Dickson, R. R. and Brown, J.: The production of North Atlantic Deep Water: sources, rates, and pathways, J. Geophys. Res., 99, 12319–12341, https://doi.org/10.1029/94jc00530, 1994.
Fine, R. A., Smethie, W. M., Bullister, J. L., Rhein, M., Min, D.-H., Warner, M. J., Poisson, A., and Weiss, R. F.: Decadal ventilation and mixing of Indian Ocean waters, Deep-Sea Res. Pt. I, 55, 20–37, https://doi.org/10.1016/j.dsr.2007.10.002, 2008.
Fujio, S.: Deep current measurements at 38∘ N east of Japan, J. Geophys. Res., 110, C02010, https://doi.org/10.1029/2004JC002288, 2005.
Fujio, S., Yanagimoto, D., and Taira, K.: Deep current structure above the Izu-Ogasawara Trench, J. Geophys. Res., 105, 6377–6386, 2000.
Ganachaud, A.: Large-scale mass transports, water mass formation, and diffusivities estimated from World Ocean Circulation Experiment (WOCE) hydrographic data, J. Geophys. Res., 108, 3213, https://doi.org/10.1029/2002JC001565, 2003.
Ganachaud, A. and Wunsch, C.: Improved estimates of global ocean circulation, heat transport and mixing from hydrographic data, Nature, 408, 453–457, 2000.
Germineaud, C., Cravatte, S., Sprintall, J., Alberty, M., Grenier, M., and Ganachaud, A.: Deep pacific circulation: New insights on pathways through the Solomon Sea, Deep-Sea Res. Pt. I, 171, 103510, https://doi.org/10.1016/j.dsr.2021.103510, 2021.
Glud, R. N., Wenzhöfer, F., Middelboe, M., Oguri, K., Turnewitsch, R., Canfield, D. E., and Kitazato, H.: High rates of microbial carbon turnover in sediments in the deepest oceanic trench on Earth, Nat. Geosci., 6, 284–288, https://doi.org/10.1038/ngeo1773, 2013.
Goodman, P. J.: The Role of North Atlantic Deep Water Formation in an OGCM's Ventilation and Thermohaline Circulation, J. Phys. Oceanogr., 28, 1759–1785, https://doi.org/10.1175/1520-0485(1998)028<1759:TRONAD>2.0.CO;2, 1998.
Gordon, A. L.: Interocean exchange of thermocline water, J. Geophys. Res.-Ocean., 91, 5037–5046, https://doi.org/10.1029/JC091iC04p05037, 1986a.
Gordon, A. L.: Is there a global scale ocean circulation?, Eos Trans. Am. Geophys. Union, 67, 109–110, https://doi.org/10.1029/EO067i009p00109, 1986b.
Gordon, A. L., Huber, B. A., and Abrahamsen, E. P.: Interannual Variability of the Outflow of Weddell Sea Bottom Water, Geophys. Res. Lett., 47, e2020GL087014, https://doi.org/10.1029/2020GL087014, 2020.
Gouretski, V., Cheng, L., and Boyer, T.: On the Consistency of the Bottle and CTD Profile Data, J. Atmos. Ocean. Technol., 39, 1869–1887, https://doi.org/10.1175/JTECH-D-22-0004.1, 2022.
Greenaway, S. F., Sullivan, K. D., Umfress, H., Beittel, A. B., and Wagner, K. D.: Revised depth of the Challenger Deep from submersible transects; including a general method for precise, pressure-derived depths in the ocean, Deep-Sea Res. Pt. I, 178, 103644, https://doi.org/10.1016/j.dsr.2021.103644, 2021.
van Haren, H.: Challenger Deep internal wave turbulence events, Deep-Sea Res. Pt. I, 165, 103400, https://doi.org/10.1016/j.dsr.2020.103400, 2020a.
van Haren, H.: Slow persistent mixing in the abyss, Ocean Dynam., 70, 339–352, 2020b.
van Haren, H.: Thermistor string corrections in data from very weakly stratified deep-ocean waters, Deep-Sea Res. Pt. I, 189, 103870, https://doi.org/10.1016/j.dsr.2022.103870, 2022.
van Haren, H.: How and what turbulent are deep Mariana Trench waters?, Dynam. Atmos. Oceans, 103, 101372, https://doi.org/10.1016/j.dynatmoce.2023.101372, 2023.
van Haren, H., Berndt, C., and Klaucke, I.: Ocean mixing in deep-sea trenches: New insights from the Challenger Deep, Mariana Trench, Deep-Sea Res. Pt. I, 129, 1–9, https://doi.org/10.1016/j.dsr.2017.09.003, 2017.
van Haren, H., Uchida, H., and Yanagimoto, D.: Further correcting pressure effects on SBE911 CTD-conductivity data from hadal depths, J. Oceanogr., 77, 137–144, https://doi.org/10.1007/s10872-020-00565-3, 2021.
Hautala, S. L. and Finucane, G.: Persistence of the Large-Scale Interior Deep Ocean Circulation in Global Repeat Hydrographic Sections, Geophys. Res. Lett., 49, e2021GL097264, https://doi.org/10.1029/2021GL097264, 2022.
Helland-Hansen, B.: Nogen hydrografiske metoder, Naturforsker Möte Kristiania, Forh. Skand. Naturf. Mote, 16, 357–359, 1916.
Huang, C., Xie, Q., Wang, D., Shu, Y., Xu, H., Xiao, J., Zu, T., Long, T., and Zhang, T.: Seasonal variability of water characteristics in the Challenger Deep observed by four cruises, Sci. Rep., 8, 11791, https://doi.org/10.1038/s41598-018-30176-4, 2018.
Ichino, M. C., Clark, M. R., Drazen, J. C., Jamieson, A. J., Jones, D. O. B., Martin, A. P., Rowden, A. A., Shank, T. M., Yancey, P. H., and Ruhl, H. A.: The distribution of benthic biomass in hadal trenches: A modelling approach to investigate the effect of vertical and lateral organic matter transport to the seafloor, Deep-Sea Res. Pt. I, 100, 21–33, https://doi.org/10.1016/j.dsr.2015.01.010, 2015.
IOC, SCOR and IAPSO: The international thermodynamic equation of seawater – 2010: Calculation and use of thermodynamic properties, Intergovernmental Oceanographic Commission, Manuals and Guides No. 56, UNESCO (English), 196 pp., 2010.
Jacobs, S. S., Giulivi, C. F., and Dutrieux, P.: Persistent Ross Sea Freshening From Imbalance West Antarctic Ice Shelf Melting, J. Geophys. Res.-Ocean., 127, e2021JC017808, https://doi.org/10.1029/2021JC017808, 2022.
Jamieson, A. and Linley, T.: Hydrozoans, scyphozoans, larvaceans and ctenophores observed in situ at hadal depths, J. Plank. Res., 43, 20–32, https://doi.org/10.1093/plankt/fbaa062, 2021.
Jamieson, A. J.: The Hadal Zone; Life in the Deepest Oceans, Cambridge University Press, ISBN: 9781107016743, 2015.
Jamieson, A. J.: A contemporary perspective on hadal science, Deep-Sea Res. Pt. II, 155, 4–10, https://doi.org/10.1016/j.dsr2.2018.01.005, 2018.
Jamieson, A. J. and Fujii, T.: Trench Connection, Biol. Lett., 7, 641–643, https://doi.org/10.1098/rsbl.2011.0231, 2011.
Jamieson, A. J. and Stewart, H. A.: Hadal zones of the Northwest Pacific Ocean, Prog. Oceanogr., 190, 102477, https://doi.org/10.1016/j.pocean.2020.102477, 2021.
Jamieson, A. J., Fujii, T., Mayor, D. J., Solan, M., and Priede, I. G.: Hadal trenches: the ecology of the deepest places on Earth, Trends Ecol. Evol., 25, 190–197, https://doi.org/10.1016/j.tree.2009.09.009, 2010.
Jamieson, A. J., Stewart, H. A., Rowden, A. A., and Clark, M. R.: Geomorphology and benthic habitats of the Kermadec Trench, Southwest Pacific Ocean, in: Seafloor Geomorphology as Benthic Habitat, Elsevier, 949–966, https://doi.org/10.1016/B978-0-12-814960-7.00059-2, 2020.
Jamieson, A. J., Linley, T. D., Eigler, S., and Macdonald, T.: A global assessment of fishes at lower abyssal and upper hadal depths (5000 to 8000 m), Deep-Sea Res. Pt. I, 178, 103642, https://doi.org/10.1016/j.dsr.2021.103642, 2021a.
Jamieson, A. J., Stewart, H. A., Weston, J., and Bongiovanni, C.: Hadal fauna of the South Sandwich Trench, Southern Ocean: Baited camera survey from the Five Deeps Expedition., Deep-Sea Res. Pt. II, 194, 104987, https://doi.org/10.1016/j.dsr2.2021.104987, 2021b.
Jamieson, A. J., Bond, T., and Vescovo, V.: No recovery of a large-scale anthropogenic sediment disturbance on the Pacific seafloor after 77 years at 6460 m depth, Mar. Pollut. Bull., 175, 113374–113374, https://doi.org/10.1016/j.marpolbul.2022.113374, 2022.
Jiang, H., Xu, H., Vetter, P. A., Xie, Q., Yu, J., Shang, X., and Yu, L.: Ocean Circulation in the Challenger Deep Derived From Super-Deep Underwater Glider Observation, Geophys. Res. Lett., 48, e2021GL093169, https://doi.org/10.1029/2021GL093169, 2021.
Johnson, G. C.: Deep water properties, velocities, and dynamics over ocean trenches, J. Mar. Res., 56, 329–347, https://doi.org/10.1357/002224098321822339, 1998.
Johnson, G. C.: Quantifying Antarctic Bottom Water and North Atlantic Deep Water volumes, J. Geophys. Res.-Ocean., 113, 1–13, https://doi.org/10.1029/2007JC004477, 2008.
Johnson, G. C., Purkey, S. G., Zilberman, N. V., and Roemmich, D.: Deep Argo quantifies bottom water warming rates in the Southwest Pacific Basin, Geophys. Res. Lett., 46, 2662–2669, 2019.
Joyce, T. M., Warren, B. A., and Talley, L. D.: The geothermal heating of the abyssal subarctic Pacific Ocean, Deep-Sea Res. Pt. I, 33, 1003–1015, https://doi.org/10.1016/0198-0149(86)90026-9, 1986.
Karstensen, J. and Tomczak, M.: Age determination of mixed water masses using CFC and oxygen data, J. Geophys. Res.-Ocean., 103, 18599–18609, https://doi.org/10.1029/98JC00889, 1998.
Katsumata, K. and Fukasawa, M.: Changes in meridional fluxes and water properties in the Southern Hemisphere subtropical oceans between 1992/1995 and 2003/2004, Prog. Oceanogr., 89, 61–91, https://doi.org/10.1016/j.pocean.2010.12.008, 2011.
Kawabe, M.: Deep Water Properties and Circulation in the Western North Pacific, in: Deep Ocean Circulation, Physical and Chemical Aspects, edited by: Teramoto, T., Elsevier, Amsterdam, 17–37, https://doi.org/10.1016/S0422-9894(08)71315-1, 1993.
Kawabe, M. and Fujio, S.: Pacific ocean Circulation Based on Observation, J. Oceanogr., 66, 389–403, https://doi.org/10.1007/s10872-010-0034-8, 2010.
Kawabe, M., Fujio, S., and Yanagimoto, D.: Deep-water circulation at low latitudes in the western North Pacific, Deep-Sea Res. Pt. I, 50, 631–656, https://doi.org/10.1016/S0967-0637(03)00040-2, 2003.
Kawagucci, S., Makabe, A., Kodama, T., Matsui, Y., Yoshikawa, C., Ono, E., Wakita, M., Nunoura, T., Uchida, H., and Yokokawa, T.: Hadal water biogeochemistry over the Izu-Ogasawara Trench observed with a full-depth CTD-CMS, Ocean Sci., 14, 575–588, https://doi.org/10.5194/os-14-575-2018, 2018.
Khatiwala, S., Primeau, F., and Holzer, M.: Ventilation of the deep ocean constrained with tracer observations and implications for radiocarbon estimates of ideal mean age, Earth Planet. Sc. Lett., 325/326, 116–125, https://doi.org/10.1016/j.epsl.2012.01.038, 2012.
Kobayashi, T., Sato, K., and King, B. A.: Observed features of salinity bias with negative pressure dependency for measurements by SBE 41 CP and SBE 61 CTD sensors on deep profiling floats, Prog. Oceanogr., 198, 102686, https://doi.org/10.1016/j.pocean.2021.102686, 2021.
Koltermann, K. P., Gouretski, V., and Jancke, K.: Hydrographic Atlas of the World Ocean Circulation Experiment (WOCE), Volume 3: Atlantic Ocean, edited by: Sparrow, M., Chapman, P., and Gould, J., International WOCE Project Office, Southampton, UK, ISBN 090417557X, 2011
Leffanue, H. and Tomczak, M.: Using OMP analysis to observe temporal variability in water mass distribution, J. Mar. Syst., 48, 3–14, https://doi.org/10.1016/j.jmarsys.2003.07.004, 2004.
Lele, R., Purkey, S. G., Nash, J. D., Mackinnon, J. A., Thurnherr, A. M., Whalen, C. B., Mecking, S., Voet, G., and Talley, L. D.: Abyssal Heat Budget in the Southwest Pacific Basin, J. Phys. Oceanogr., 51, 3317–3333, https://doi.org/10.1175/JPO-D-21-0045.1, 2021.
Liu, M. and Tanhua, T.: Water masses in the Atlantic Ocean: characteristics and distributions, Ocean Sci., 17, 463–486, https://doi.org/10.5194/os-17-463-2021, 2021.
Liu, X.: Flow Pathways of Abyssal Water in the Yap Trench and Adjacent Channels and Basins, Front. Mar. Sci., 9, 16, https://doi.org/10.3389/fmars.2022.910941, 2022.
Liu, X., Liu, Y., Cao, W., and Sun, C.: Water characteristics of abyssal and hadal zones in the southern Yap Trench observed with the submersible Jiaolong, J. Oceanol. Limnol., 38, 593–605, https://doi.org/10.1007/s00343-019-8368-6, 2020.
Ma, K., Chen, Z.-H., Li, Z.-R., Song, Z.-J., Yuan, Z.-W., Wu, B., Jiao, Q., and Wang, Z.-M.: Study on 10 000-m Hydrological Observations in the Mariana Trench, Oceanol. Limnol. Sin., 52, 1075–1087, https://doi.org/10.11693/hyhz20201100320, 2021.
Macdonald, A., Mecking, S., Robbins, P., Toole, J., Johnson, G., Talley, L., Cook, M., and Wijffels, S. E.: The WOCE-era 3-D Pacific Ocean circulation and heat budget, Prog. Oceanogr., 82, 281–325, https://doi.org/10.1016/J.POCEAN.2009.08.002, 2009.
Mantyla, A. W. and Reid, J. L.: Measurements of water characteristics at depths greater than 10 km in the Marianas Trench, Deep-Sea Res., 25, 169–173, https://doi.org/10.1016/0146-6291(78)90004-8, 1978.
Mantyla, A. W. and Reid, J. L.: On the origins of deep and bottom waters of the Indian Ocean, J. Geophys. Res.-Ocean., 100, 2417–2439, 1995.
Mitsuzawa, K. and Holloway, G.: Characteristics of deep currents along trenches in the northwest Pacific, J. Geophys. Res.-Ocean., 103, 13085–13092, 1998.
Nagano, A., Ichikawa, K., Ichikawa, H., Yoshikawa, Y., and Murakami, K.: Large ageostrophic currents in the abyssal layer southeast of Kyushu, Japan, by direct measurement of LADCP, J. Oceanogr., 69, 259–268, https://doi.org/10.1007/s10872-013-0170-z, 2013.
Naveira Garabato, A. C., McDonagh, E. L., Stevens, D. P., Heywood, K. J., and Sanders, R. J.: On the export of Antarctic Bottom Water from the Weddell Sea, Deep-Sea Res. Pt. II, 49, 4715–4742, https://doi.org/10.1016/S0967-0645(02)00156-X, 2002.
Naveira Garabato, A. C., Williams, A. P., and Bacon, S.: The three-dimensional overturning circulation of the Southern Ocean during the WOCE era, Prog. Oceanogr., 120, 41–78, https://doi.org/10.1016/j.pocean.2013.07.018, 2014.
Naveira Garabato, A. C., MacGilchrist, G. A., Brown, P. J., Evans, D. G., Meijers, A. J., and Zika, J. D.: High-latitude ocean ventilation and its role in Earth's climate transitions, Philos. T. R. Soc., 375, 20160324, https://doi.org/10.1098/rsta.2016.0324, 2017.
Nunoura, T., Hirai, M., Yoshida-Takashima, Y., Nishizawa, M., Kawagucci, S., Yokokawa, T., Miyazaki, J., Koide, O., Makita, H., Takaki, Y., Sunamura, M., and Takai, K.: Distribution and niche separation of planktonic microbial communities in the water columns from the surface to the hadal waters of the Japan Trench under the Eutrophic Ocean, Front. Microbiol., 7, 1–12, https://doi.org/10.3389/fmicb.2016.01261, 2016.
Oguri, K., Kawamura, K., Sakaguchi, A., Toyofuku, T., Kasaya, T., Murayama, M., Fujikura, K., Glud, R. N., and Kitazato, H.: Hadal disturbance in the Japan Trench induced by the 2011 Tohoku-Oki earthquake, Sci. Rep., 3, 1915, https://doi.org/10.1038/srep01915, 2013.
Oguri, K., Masqué, P., Zabel, M., Stewart, H. A., MacKinnon, G., Rowden, A. A., Berg, P., Wenzhöfer, F., and Glud, R. N.: Sediment Accumulation and Carbon Burial in Four Hadal Trench Systems, J. Geophys. Res.-Biogeo., 127, e2022JG006814, https://doi.org/10.1029/2022JG006814, 2022.
Orsi, A. H. and Whitworth, T.: Hydrographic Atlas of the World Ocean Circulation Experiment (WOCE), Volume 1: Southern Ocean, edited by: Sparrow, M., Chapman, P., and Gould, J., International WOCE Project Office, Southampton, U.K., ISBN 0-904175-49-9, 2004.
Orsi, A. H., Nowlin, W. D., and Whitworth, T.: On the circulation and stratification of the Weddell Gyre, Deep-Sea Res. Pt. I, 40, 169–203, https://doi.org/10.1016/0967-0637(93)90060-G, 1993.
Orsi, A. H., Johnson, G. C., and Bullister, J. L.: Circulation, mixing, and production of Antarctic Bottom Water, Prog. Oceanogr., 43, 55–109, https://doi.org/10.1016/S0079-6611(99)00004-X, 1999.
Pond, S. and Pickard, G. L.: Introductory dynamical oceanography, Gulf Professional Publishing, Elsevier, ISBN: 978-0-08-057054-9, https://doi.org/10.1016/C2009-0-24288-7, 1983.
Purkey, S. G., Johnson, G. C., Talley, L. D., Sloyan, B. M., Wijffels, S. E., Smethie, W., Mecking, S., and Katsumata, K.: Unabated Bottom Water Warming and Freshening in the South Pacific Ocean, J. Geophys. Res.-Ocean., 124, 1778–1794, https://doi.org/10.1029/2018JC014775, 2019.
Rahmstorf, S. and England, M. H.: Influence of Southern Hemisphere Winds on North Atlantic Deep Water Flow, J. Phys. Oceanogr., 27, 2040–2054, https://doi.org/10.1175/1520-0485(1997)027<2040:IOSHWO>2.0.CO;2, 1997.
Reid, J. L.: On the total geostrophic circulation of the pacific ocean: Flow patterns, tracers, and transports, Prog. Oceanogr., 39, 263–352, https://doi.org/10.1016/S0079-6611(97)00012-8, 1997.
Rintoul, S. R.: On the Origin and Influence of Adélie Land Bottom Water, in: Ocean, Ice, and Atmosphere: Interactions at the Antarctic Continental Margin, American Geophysical Union (AGU), 151–171, https://doi.org/10.1029/AR075p0151, 1985.
Robinson, A. and Stommel, H.: The oceanic thermocline and the associated thermohaline circulation 1, Tellus A, 11, 295–308, 1959.
Roemmich, D., Hautala, S., and Rudnick, D.: Northward abyssal transport through the Samoan passage and adjacent regions, 101, 14039–14055, https://doi.org/10.1029/96JC00797, 1996.
Schmidt, C., Morrison, A. K., and England, M. H.: Wind– and sea-ice–driven interannual variability of Antarctic Bottom Water formation, J. Geophys. Res.-Ocean., 128, e2023JC019774, https://doi.org/10.1029/2023JC019774, 2023.
Schmitz, W.: On the interbasin-scale thermohaline circulation, Rev. Geophys., 33, 151–173, 1995.
Sea-Bird Scientific: SBE Data Processing, SBE Data Processing, Sea-bird Scientific, 2017, https://www.seabird.com/software (last access: 5 November 2022), 2018.
Sea-Bird Scientific: SBE 49 FastCAT CTD Sensor User Manual, Bellevue, Washington, USA, https://www.seabird.com/asset-get.download.jsa?id=54627862506 (last access: 10 January 2023), 2020.
Siedler, G., Holfort, J., Zenk, W., Müller, T. J., and Csernok, T.: Deep-water flow in the Mariana and Caroline Basins, J. Phys. Oceanogr., 34, 566–581, https://doi.org/10.1175/2511.1, 2004.
Singh, S. P., Singh, S. K., Goswami, V., Bhushan, R., and Rai, V. K.: Spatial distribution of dissolved neodymium and εNd in the Bay of Bengal: Role of particulate matter and mixing of water masses, Geochim. Cosmochim. Ac., 94, 38–56, https://doi.org/10.1016/j.gca.2012.07.017, 2012.
Sloyan, B. M.: Antarctic bottom and lower circumpolar deep water circulation in the eastern Indian Ocean, J. Geophys. Res.-Ocean., 111, C02006, https://doi.org/10.1029/2005JC003011, 2006.
Sloyan, B. M. and Rintoul, S. R.: The Southern Ocean Limb of the Global Deep Overturning Circulation, J. Phys. Oceanogr., 31, 143–173, https://doi.org/10.1175/1520-0485(2001)031<0143:TSOLOT>2.0.CO;2, 2001.
Sloyan, B. M., Wanninkhof, R., Kramp, M., Johnson, G. C., Talley, L. D., Tanhua, T., McDonagh, E., Cusack, C., O'Rourke, E., McGovern, E., Katsumata, K., Diggs, S., Hummon, J., Ishii, M., Azetsu-Scott, K., Boss, E., Ansorge, I., Perez, F. F., Mercier, H., Williams, M. J. M., Anderson, L., Lee, J. H., Murata, A., Kouketsu, S., Jeansson, E., Hoppema, M., and Campos, E.: The Global Ocean Ship-Based Hydrographic Investigations Program (GO-SHIP): A Platform for Integrated Multidisciplinary Ocean Science, Front. Mar. Sci., 6, 445, https://doi.org/10.3389/fmars.2019.00445, 2019.
Solodoch, A., Stewart, A. L., Hogg, A. McC., Morrison, A. K., Kiss, A. E., Thompson, A. F., Purkey, S. G., and Cimoli, L.: How Does Antarctic Bottom Water Cross the Southern Ocean?, Geophys. Res. Lett., 49, e2021GL097211, https://doi.org/10.1029/2021GL097211, 2022.
Stewart, H. A. and Jamieson, A. J.: Habitat heterogeneity of hadal trenches: Considerations and implications for future studies, Prog. Oceanogr., 161, 47–65, https://doi.org/10.1016/j.pocean.2018.01.007, 2018.
Stommel, H. and Arons, A. B.: On the abyssal circulation of the world ocean-I. Stationary planetary flow patterns on a sphere, Deep-Sea Res., 5, 80–82, 1959.
Swan, J. A., Jamieson, A. J., Linley, T. D., and Yancey, P. H.: Worldwide distribution and depth limits of decapod crustaceans (Penaeoidea, Oplophoroidea) across the abyssal-hadal transition zone of eleven subduction trenches and five additional deep-sea features, J. Crustac. Biol., 41, ruaa102, https://doi.org/10.1093/jcbiol/ruaa102, 2021.
Taft, B. A., Hayes, S. P., Fruederich, G. E., and Codispoti, A.: Flow of Abyssal Water into the Samoa Passage, Deep-Sea Res., 38, 103–128, 1991.
Taira, K.: Super-deep CTD Measurements in the Izu-Ogasawara Trench and a Comparison of Geostrophic Shears with Direct Measurements, J. Oceanogr., 62, 753–758, 2006.
Taira, K., Kitagawa, S., Yamashiro, T., and Yanagimoto, D.: Deep and Bottom Currents in the Challenger Deep, Mariana Trench, Measured with Super-Deep Current Meters, J. Oceanogr., 60, 919–926, 2004.
Taira, K., Yanagimoto, D., and Kitagawa, S.: Deep CTD Casts in the Challenger Deep, Mariana Trench, J. Oceanogr., 61, 447–454, 2005.
Talley, L. D.: Hydrographic Atlas of the World Ocean Circulation Experiment (WOCE), Vol. 2, Pacific Ocean, WOCE International Project Office Southampton, edited by: Sparrow, M., Chapman, P., and Gould, J., Southampton, UK, ISBN 0-904175-54-5, 2007.
Talley, L. D.: Descriptive physical oceangraphy: an introduction, Academic Press, ISBN: 978-0-7506-4552-2, 2011.
Talley, L. D.: Closure of the global overturning circulation through the Indian, Pacific, and southern oceans, Oceanography, 26, 80–97, https://doi.org/10.5670/oceanog.2013.07, 2013a.
Talley, L. D.: Hydrographic Atlas of the World Ocean Circulation Experiment (WOCE), Vol. 4, Indian Ocean, eScholarship, University of California, edited by: Sparrow, M., Chapman, P., and Gould, J., International WOCE Project Office, Southampton, UK, ISBN 0904175588, 2013b.
Tamsitt, V., Abernathey, R. P., Mazloff, M. R., Wang, J., and Talley, L. D.: Transformation of Deep Water Masses Along Lagrangian Upwelling Pathways in the Southern Ocean, J. Geophys. Res.-Ocean., 123, 1994–2017, https://doi.org/10.1002/2017JC013409, 2018.
Thomas, G., Purkey, S. G., Roemmich, D., Foppert, A., and Rintoul, S. R.: Spatial Variability of Antarctic Bottom Water in the Australian Antarctic Basin From 2018–2020 Captured by Deep Argo, Geophys. Res. Lett., 47, e2020GL089467, https://doi.org/10.1029/2020GL089467, 2020.
Tian, Z., Zhou, C., Xiao, X., Wang, T., Qu, T., Yang, Q., Zhao, W., and Tian, J.: Water-Mass Properties and Circulation in the Deep and Abyssal Philippine Sea, J. Geophys. Res.-Ocean., 126, e2020JC016994, https://doi.org/10.1029/2020JC016994, 2021.
Tomczak, M.: Some historical, theoretical and applied aspects of quantitative water mass analysis, J. Mar. Res., 57, 275–303, https://doi.org/10.1357/002224099321618227, 1999.
Tomczak, M. and Large, D. G.: Optimum multiparameter analysis of mixing in the thermocline of the eastern Indian Ocean, J. Geophys. Res.-Ocean., 94, 16141–16149, 1989.
Turnewitsch, R., Falahat, S., Stehlikova, J., Oguri, K., Glud, R. N., Middelboe, M., Kitazato, H., Wenzhöfer, F., Ando, K., Fujio, S., and Yanagimoto, D.: Recent sediment dynamics in hadal trenches: Evidence for the influence of higher-frequency (tidal, near-inertial) fluid dynamics, Deep-Sea Res. Pt. I, 90, 125–138, https://doi.org/10.1016/j.dsr.2014.05.005, 2014.
Wang, F., Zhang, L., Hu, D., Wang, Q., Zhai, F., and Hu, S.: The vertical structure and variability of the western boundary currents east of the Philippines: case study from in situ observations from December 2010 to August 2014, J. Oceanogr., 73, 743–758, https://doi.org/10.1007/s10872-017-0429-x, 2017.
Wang, W., Köhl, A., and Stammer, D.: The deep meridional overturning circulation in the Indian Ocean inferred from the GECCO synthesis, Dynam. Atmos. Oceans, 58, 44–61, https://doi.org/10.1016/j.dynatmoce.2012.08.001, 2012.
Warren, B. A.: Deep circulation of the world ocean, in: Evolution of physical oceanography, edited by: Warren, B. A. and Wunsch, C., Massachusetts Institude of Technology, Boston, 6–40, ISBN: 978-0262231046, 1981.
Warren, B. A. and Brechner Owens, W.: Some preliminary results concerning deep Northern-Boundary currents in the North Pacific, Prog. Oceanogr., 14, 537–551, https://doi.org/10.1016/0079-6611(85)90027-8, 1985.
Watling, L., Guinotte, J., Clark, M. R., and Smith, C. R.: A proposed biogeography of the deep ocean floor, Prog. Oceanogr., 111, 91–112, https://doi.org/10.1016/j.pocean.2012.11.003, 2013.
Webb, T. J., Vanden Berghe, E., and O'Dor, R.: Biodiversity's big wet secret: The global distribution of marine biological records reveals chronic under-exploration of the deep pelagic ocean, PLoS ONE, 5, e10223, https://doi.org/10.1371/journal.pone.0010223, 2010.
Weston, J. J. and Jamieson, A. J.: The Multi-Ocean Distribution of the Hadal Amphipod, Hirondellea dubia (Crustacea, Amphipoda), Front. Mar. Sci., 9, 824640, https://doi.org/10.3389/fmars.2022.824640, 2022.
Wijffels, S. E., Hall, M. M., Joyce, T., Torres, D. J., Hacker, P., and Firing, E.: Multiple deep gyres of the western North Pacific: A WOCE section along 149∘ E, J. Geophys. Res.-Ocean., 103, 12985–13009, https://doi.org/10.1029/98JC01016, 1998.
Wijffels, S. E., Sprintall, J., Fieux, M., and Bray, N.: The JADE and WOCE I10/IR6 throughflow sections in the southeast Indian Ocean, Part 1: Water mass distribution and variability, Deep-Sea Res. Pt. II, 49, 1341–1362, 2002.
Wust, G.: Thermometric Measurement of Depth, Int. Hydrogr. Rev., 10, 28–49, 1933.
Zhai, F. and Gu, Y.: Abyssal Circulation in the Philippine Sea, J. Ocean Univ. China, 19, 249–262, https://doi.org/10.1007/s11802-020-4241-7, 2020.
Zhang, L. and Delworth, T.: Impact of the Antarctic bottom water formation on the Weddell Gyre and its northward propagation characteristics in GFDL CM2.1 model, J. Geophys. Res.-Ocean., 121, 5825–5846, https://doi.org/10.1002/2016JC011790, 2016.
Zhou, C., Xu, H., Xiao, X., Zhao, W., Yang, J., Yang, Q., Jiang, H., Xie, Q., Long, T., Wang, T., Huang, X., Zhang, Z., Guan, S., and Tian, J.: Intense Abyssal Flow Through the Yap-Mariana Junction in the Western North Pacific, Geophys. Res. Lett., 49, e2021GL096530, https://doi.org/10.1029/2021GL096530, 2022.
Zhou, S., Meijers, A. J. S., Meredith, M. P., Abrahamsen, E. P., Holland, P. R., Silvano, A., Sallée, J.-B., and Østerhus, S.: Slowdown of Antarctic Bottom Water export driven by climatic wind and sea-ice changes, Nat. Clim. Change, 1–9, 701–709, https://doi.org/10.1038/s41558-023-01695-4, 2023.
Zilberman, N., Roemmich, D., and Gilson, J.: Deep-ocean circulation in the Southwest Pacific Ocean interior: Estimates of the mean flow and variability using Deep Argo data, Geophys. Res. Lett., 47, e2020GL088342, https://doi.org/10.1029/2020GL088342, 2020.
Short summary
We collected observations of the ocean environment at depths over 6000 m in the Southern Ocean, Indian Ocean, and western Pacific using sensor-equipped landers. We found that trench locations impact the water characteristics over these depths. Moving northward, they generally warmed but differed due to their position along bottom water circulation paths. These insights stress the importance of further research in understanding the environment of these deep regions and their importance.
We collected observations of the ocean environment at depths over 6000 m in the Southern Ocean,...
