Articles | Volume 15, issue 2
https://doi.org/10.5194/os-15-333-2019
© Author(s) 2019. 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-15-333-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Seasonal and inter-annual variability of water column properties along the Rottnest continental shelf, south-west Australia
Miaoju Chen
CORRESPONDING AUTHOR
Oceans Graduate School & the UWA Oceans Institute, the University of Western
Australia, Perth, 6009, Australia
Charitha B. Pattiaratchi
Oceans Graduate School & the UWA Oceans Institute, the University of Western
Australia, Perth, 6009, Australia
Anas Ghadouani
School of Engineering, the University of
Western Australia, Perth, 6009, Australia
Christine Hanson
Oceans Graduate School & the UWA Oceans Institute, the University of Western
Australia, Perth, 6009, Australia
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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.
Jessica Kolbusz, Jan Zika, Charitha Pattiaratchi, and Alan Jamieson
Ocean Sci., 20, 123–140, https://doi.org/10.5194/os-20-123-2024, https://doi.org/10.5194/os-20-123-2024, 2024
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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.
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.
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.
Amar V. V. Nanda, Leah Beesley, Luca Locatelli, Berry Gersonius, Matthew R. Hipsey, and Anas Ghadouani
Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2017-307, https://doi.org/10.5194/hess-2017-307, 2017
Revised manuscript not accepted
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When anthropological effects result in changes to wetland hydrology; this often leads to a decline in their ecological integrity. We present a policy oriented approach that assesses the suitability of management when rigorous ecological data are lacking. We link ecological objectives from management authorities to threshold values for water depth defined in policy. Results show insufficient water levels for key ecological objectives and we conclude that current policy is ineffective.
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.
Elke S. Reichwaldt and Anas Ghadouani
Hydrol. Earth Syst. Sci., 20, 2679–2689, https://doi.org/10.5194/hess-20-2679-2016, https://doi.org/10.5194/hess-20-2679-2016, 2016
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We assessed if nitrogen stable isotopes in mussels are a suitable indicator, capable of resolving spatial and temporal variability of nutrient pollution in an urban estuary. Our results highlight the value of using stable isotope analysis as an integrative tool to establish an understanding of local processes and pollution levels in theses urban aquatic systems. We suggest that mussels can become a robust tool for the detection of emerging anthropogenic pollutants of concern in urban water systems.
S. C. Sinang, E. S. Reichwaldt, and A. Ghadouani
Hydrol. Earth Syst. Sci., 19, 2179–2195, https://doi.org/10.5194/hess-19-2179-2015, https://doi.org/10.5194/hess-19-2179-2015, 2015
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
D. J. Barrington, A. Ghadouani, and G. N. Ivey
Hydrol. Earth Syst. Sci., 17, 2097–2105, https://doi.org/10.5194/hess-17-2097-2013, https://doi.org/10.5194/hess-17-2097-2013, 2013
Related subject area
Approach: In situ Observations | Depth range: Shelf-sea depth | Geographical range: Shelf Seas | Phenomena: Temperature, Salinity and Density Fields
Vertical distribution of water mass properties under the influence of subglacial discharge in Bowdoin Fjord, northwestern Greenland
The Barents Sea frontal zones and water masses variability (1980–2011)
The 2011 marine heat wave in Cockburn Sound, southwest Australia
Transport of warm Upper Circumpolar Deep Water onto the western Antarctic Peninsula continental shelf
Seasonal and inter-annual temperature variability in the bottom waters over the western Black Sea shelf
On the freshening of the northwestern Weddell Sea continental shelf
Yoshihiko Ohashi, Shigeru Aoki, Yoshimasa Matsumura, Shin Sugiyama, Naoya Kanna, and Daiki Sakakibara
Ocean Sci., 16, 545–564, https://doi.org/10.5194/os-16-545-2020, https://doi.org/10.5194/os-16-545-2020, 2020
Short summary
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Subglacial freshwater discharge affects fjord circulation, material transport, and biological productivity. To better understand the influence of subglacial discharge on properties of vertical water mass profiles of Bowdoin Fjord in northwestern Greenland, observations and numerical experiments were conducted. The vertical distributions of turbid freshwater outflow near the surface and at the subsurface were likely due to the amount of subglacial discharge and fjord stratification, respectively.
L. Oziel, J. Sirven, and J.-C. Gascard
Ocean Sci., 12, 169–184, https://doi.org/10.5194/os-12-169-2016, https://doi.org/10.5194/os-12-169-2016, 2016
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The Barents Sea (BS) is a subpolar region and a zone transition where the Atlantic and the Arctic water masses meets and creates the "Polar Front". This study, based on one of the largest hydrological data set, showed for the first time that the "Polar Front" splits into two branches in the eastern part of the BS. This study also showed that, in a context of climate change, the BS experiences an "Atlantification", which goes along with a north-eastward shift of the frontal structure.
T. H. Rose, D. A. Smale, and G. Botting
Ocean Sci., 8, 545–550, https://doi.org/10.5194/os-8-545-2012, https://doi.org/10.5194/os-8-545-2012, 2012
D. G. Martinson and D. C. McKee
Ocean Sci., 8, 433–442, https://doi.org/10.5194/os-8-433-2012, https://doi.org/10.5194/os-8-433-2012, 2012
G. I. Shapiro, F. Wobus, and D. L. Aleynik
Ocean Sci., 7, 585–596, https://doi.org/10.5194/os-7-585-2011, https://doi.org/10.5194/os-7-585-2011, 2011
H. H. Hellmer, O. Huhn, D. Gomis, and R. Timmermann
Ocean Sci., 7, 305–316, https://doi.org/10.5194/os-7-305-2011, https://doi.org/10.5194/os-7-305-2011, 2011
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