Articles | Volume 16, issue 5
https://doi.org/10.5194/os-16-1317-2020
© Author(s) 2020. 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-16-1317-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
| 
30 Oct 2020
Research article | Highlight paper |
| 30 Oct 2020
| 30 Oct 2020
Beaching patterns of plastic debris along the Indian Ocean rim
Mirjam van der Mheen
CORRESPONDING AUTHOR
Oceans Graduate School and the UWA Oceans Institute, the University of Western Australia, Perth, Australia
Erik van Sebille
Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, the Netherlands
Charitha Pattiaratchi
Oceans Graduate School and the UWA Oceans Institute, the University of Western Australia, Perth, Australia
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EGUsphere, https://doi.org/10.5194/egusphere-2024-1596, https://doi.org/10.5194/egusphere-2024-1596, 2024
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EGUsphere, https://doi.org/10.5194/egusphere-2024-1649, https://doi.org/10.5194/egusphere-2024-1649, 2024
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Geosci. Commun., 7, 91–100, https://doi.org/10.5194/gc-7-91-2024, https://doi.org/10.5194/gc-7-91-2024, 2024
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Simulating the transport of floating particles on the ocean surface is crucial for solving many societal issues. Here, we investigate how the representation of wind-generated surface waves impacts particle transport simulations. We find that different wave-driven processes can alter the transport patterns, and that commonly adopted approximations are not always adequate. This implies that ideally coupled ocean-wave models should be used for surface particle transport simulations.
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.
Philippe F. V. W. Frankemölle, Peter D. Nooteboom, Joe Scutt Phillips, Lauriane Escalle, Simon Nicol, and Erik van Sebille
Ocean Sci., 20, 31–41, https://doi.org/10.5194/os-20-31-2024, https://doi.org/10.5194/os-20-31-2024, 2024
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Tor Nordam, Ruben Kristiansen, Raymond Nepstad, Erik van Sebille, and Andy M. Booth
Geosci. Model Dev., 16, 5339–5363, https://doi.org/10.5194/gmd-16-5339-2023, https://doi.org/10.5194/gmd-16-5339-2023, 2023
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Stefanie L. Ypma, Quinten Bohte, Alexander Forryan, Alberto C. Naveira Garabato, Andy Donnelly, and Erik van Sebille
Ocean Sci., 18, 1477–1490, https://doi.org/10.5194/os-18-1477-2022, https://doi.org/10.5194/os-18-1477-2022, 2022
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Reint Fischer, Delphine Lobelle, Merel Kooi, Albert Koelmans, Victor Onink, Charlotte Laufkötter, Linda Amaral-Zettler, Andrew Yool, and Erik van Sebille
Biogeosciences, 19, 2211–2234, https://doi.org/10.5194/bg-19-2211-2022, https://doi.org/10.5194/bg-19-2211-2022, 2022
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Victor Onink, Erik van Sebille, and Charlotte Laufkötter
Geosci. Model Dev., 15, 1995–2012, https://doi.org/10.5194/gmd-15-1995-2022, https://doi.org/10.5194/gmd-15-1995-2022, 2022
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Mikael L. A. Kaandorp, Stefanie L. Ypma, Marijke Boonstra, Henk A. Dijkstra, and Erik van Sebille
Ocean Sci., 18, 269–293, https://doi.org/10.5194/os-18-269-2022, https://doi.org/10.5194/os-18-269-2022, 2022
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A large amount of marine litter, such as plastics, is located on or around beaches. Both the total amount of this litter and its transport are poorly understood. We investigate this by training a machine learning model with data of cleanup efforts on Dutch beaches between 2014 and 2019, obtained by about 14 000 volunteers. We find that Dutch beaches contain up to 30 000 kg of litter, largely depending on tides, oceanic transport, and how exposed the beaches are.
Peter D. Nooteboom, Peter K. Bijl, Christian Kehl, Erik van Sebille, Martin Ziegler, Anna S. von der Heydt, and Henk A. Dijkstra
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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.
C. Kehl, R. P. B. Fischer, and E. van Sebille
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., V-4-2021, 217–224, https://doi.org/10.5194/isprs-annals-V-4-2021-217-2021, https://doi.org/10.5194/isprs-annals-V-4-2021-217-2021, 2021
Rebeca de la Fuente, Gábor Drótos, Emilio Hernández-García, Cristóbal López, and Erik van Sebille
Ocean Sci., 17, 431–453, https://doi.org/10.5194/os-17-431-2021, https://doi.org/10.5194/os-17-431-2021, 2021
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Plastic pollution is a major environmental issue affecting the oceans. The number of floating and sedimented pieces has been quantified by several studies. But their abundance in the water column remains mostly unknown. To fill this gap we model the dynamics of a particular type of particle, rigid microplastics sinking rapidly in open sea in the Mediterranean. We find they represent a small but appreciable fraction of the total sea plastic and discuss characteristics of their sinking motion.
David Wichmann, Christian Kehl, Henk A. Dijkstra, and Erik van Sebille
Nonlin. Processes Geophys., 28, 43–59, https://doi.org/10.5194/npg-28-43-2021, https://doi.org/10.5194/npg-28-43-2021, 2021
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Fluid parcels transported in complicated flows often contain subsets of particles that stay close over finite time intervals. We propose a new method for detecting finite-time coherent sets based on the density-based clustering technique of ordering points to identify the clustering structure (OPTICS). Unlike previous methods, our method has an intrinsic notion of coherent sets at different spatial scales. OPTICS is readily implemented in the SciPy sklearn package, making it easy to use.
Chris S. M. Turney, Richard T. Jones, Nicholas P. McKay, Erik van Sebille, Zoë A. Thomas, Claus-Dieter Hillenbrand, and Christopher J. Fogwill
Earth Syst. Sci. Data, 12, 3341–3356, https://doi.org/10.5194/essd-12-3341-2020, https://doi.org/10.5194/essd-12-3341-2020, 2020
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The Last Interglacial (129–116 ka) experienced global temperatures and sea levels higher than today. The direct contribution of warmer conditions to global sea level (thermosteric) are uncertain. We report a global network of sea surface temperatures. We find mean global annual temperature anomalies of 0.2 ± 0.1˚C and an early maximum peak of 0.9 ± 0.1˚C. Our reconstruction suggests warmer waters contributed on average 0.08 ± 0.1 m and a peak contribution of 0.39 ± 0.1 m to global sea level.
Linda K. Dämmer, Lennart de Nooijer, Erik van Sebille, Jan G. Haak, and Gert-Jan Reichart
Clim. Past, 16, 2401–2414, https://doi.org/10.5194/cp-16-2401-2020, https://doi.org/10.5194/cp-16-2401-2020, 2020
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The compositions of foraminifera shells often vary with environmental parameters such as temperature or salinity; thus, they can be used as proxies for these environmental variables. Often a single proxy is influenced by more than one parameter. Here, we show that while salinity impacts shell Na / Ca, temperature has no effect. We also show that the combination of different proxies (Mg / Ca and δ18O) to reconstruct salinity does not seem to work as previously thought.
David Wichmann, Christian Kehl, Henk A. Dijkstra, and Erik van Sebille
Nonlin. Processes Geophys., 27, 501–518, https://doi.org/10.5194/npg-27-501-2020, https://doi.org/10.5194/npg-27-501-2020, 2020
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The surface transport of heat, nutrients and plastic in the North Atlantic Ocean is organized into large-scale flow structures. We propose a new and simple method to detect such features in ocean drifter data sets by identifying groups of trajectories with similar dynamical behaviour using network theory. We successfully detect well-known regions such as the Subpolar and Subtropical gyres, the Western Boundary Current region and the Caribbean Sea.
Erik van Sebille, Philippe Delandmeter, John Schofield, Britta Denise Hardesty, Jen Jones, and Andy Donnelly
Ocean Sci., 15, 1341–1349, https://doi.org/10.5194/os-15-1341-2019, https://doi.org/10.5194/os-15-1341-2019, 2019
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The Galápagos Archipelago and Galápagos Marine Reserve are among the world's most iconic wildlife refuges. Yet, plastic litter is now found even in this remote archipelago. It is unclear where this plastic originates from. In this study, we show that remote coastal sources of plastic pollution are fairly localized and limited to South American and Central American coastlines. Identifying how plastic ends up in the Galápagos aids integrated management opportunities to reduce plastic pollution.
Philippe Delandmeter and Erik van Sebille
Geosci. Model Dev., 12, 3571–3584, https://doi.org/10.5194/gmd-12-3571-2019, https://doi.org/10.5194/gmd-12-3571-2019, 2019
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Parcels is a framework to compute how ocean currents transport
stuffsuch as plankton and plastic around. In the latest version 2.0 of Parcels, we focus on more accurate interpolation schemes and implement methods to seamlessly combine data from different sources (such as winds and currents, possibly in different regions). We show that this framework is very efficient for tracking how microplastic is transported through the North Sea into the Arctic.
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.
Fabrice Ardhuin, Yevgueny Aksenov, Alvise Benetazzo, Laurent Bertino, Peter Brandt, Eric Caubet, Bertrand Chapron, Fabrice Collard, Sophie Cravatte, Jean-Marc Delouis, Frederic Dias, Gérald Dibarboure, Lucile Gaultier, Johnny Johannessen, Anton Korosov, Georgy Manucharyan, Dimitris Menemenlis, Melisa Menendez, Goulven Monnier, Alexis Mouche, Frédéric Nouguier, George Nurser, Pierre Rampal, Ad Reniers, Ernesto Rodriguez, Justin Stopa, Céline Tison, Clément Ubelmann, Erik van Sebille, and Jiping Xie
Ocean Sci., 14, 337–354, https://doi.org/10.5194/os-14-337-2018, https://doi.org/10.5194/os-14-337-2018, 2018
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The Sea surface KInematics Multiscale (SKIM) monitoring mission is a proposal for a future satellite that is designed to measure ocean currents and waves. Using a Doppler radar, the accurate measurement of currents requires the removal of the mean velocity due to ocean wave motions. This paper describes the main processing steps needed to produce currents and wave data from the radar measurements. With this technique, SKIM can provide unprecedented coverage and resolution, over the global ocean.
Michael Lange and Erik van Sebille
Geosci. Model Dev., 10, 4175–4186, https://doi.org/10.5194/gmd-10-4175-2017, https://doi.org/10.5194/gmd-10-4175-2017, 2017
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Here, we present version 0.9 of Parcels (Probably A Really Computationally Efficient Lagrangian Simulator). Parcels is an experimental prototype code aimed at exploring novel approaches for Lagrangian tracking of virtual ocean particles in the petascale age. The modularity, flexibility and scalability will allow the code to be used to track water, nutrients, microbes, plankton, plastic and even fish.
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.
Chris S. M. Turney, Christopher J. Fogwill, Jonathan G. Palmer, Erik van Sebille, Zoë Thomas, Matt McGlone, Sarah Richardson, Janet M. Wilmshurst, Pavla Fenwick, Violette Zunz, Hugues Goosse, Kerry-Jayne Wilson, Lionel Carter, Mathew Lipson, Richard T. Jones, Melanie Harsch, Graeme Clark, Ezequiel Marzinelli, Tracey Rogers, Eleanor Rainsley, Laura Ciasto, Stephanie Waterman, Elizabeth R. Thomas, and Martin Visbeck
Clim. Past, 13, 231–248, https://doi.org/10.5194/cp-13-231-2017, https://doi.org/10.5194/cp-13-231-2017, 2017
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The Southern Ocean plays a fundamental role in global climate but suffers from a dearth of observational data. As the Australasian Antarctic Expedition 2013–2014 we have developed the first annually resolved temperature record using trees from subantarctic southwest Pacific (52–54˚S) to extend the climate record back to 1870. With modelling we show today's high climate variability became established in the ~1940s and likely driven by a Rossby wave response originating from the tropical Pacific.
Christopher J. Fogwill, Erik van Sebille, Eva A. Cougnon, Chris S. M. Turney, Steve R. Rintoul, Benjamin K. Galton-Fenzi, Graeme F. Clark, E. M. Marzinelli, Eleanor B. Rainsley, and Lionel Carter
The Cryosphere, 10, 2603–2609, https://doi.org/10.5194/tc-10-2603-2016, https://doi.org/10.5194/tc-10-2603-2016, 2016
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Here we report new data from in situ oceanographic surveys and high-resolution ocean modelling experiments in the Commonwealth Bay region of East Antarctica, where in 2010 there was a major reconfiguration of the regional icescape due to the collision of the 97 km long iceberg B09B with the Mertz Glacier tongue. Here we compare post-calving observations with high-resolution ocean modelling which suggest that this reconfiguration has led to the development of a new polynya off Commonwealth Bay.
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.
Paulina Cetina-Heredia, Erik van Sebille, Richard Matear, and Moninya Roughan
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-53, https://doi.org/10.5194/bg-2016-53, 2016
Revised manuscript not accepted
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Characterizing phytoplankton growth influences fisheries and climate. We use a lagrangian approach to identify phytoplankton blooms in the Great Australian Bight (GAB), and associate them with nitrate sources. We find that 88 % of the nitrate utilized in blooms is originated between the GAB and the SubAntarctic Front. Large nitrate concentrations are supplied at depth but do not reach the euphotic zone often. As a result, 55 % of blooms utilize nitrate supplied in the top 100 m.
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
Cited articles
Andrady, A.: Microplastics in the marine environment, Mar. Pollut.
Bull., 62, 1596–1605, https://doi.org/10.1016/j.marpolbul.2011.05.030, 2011. a
Ashok, K. and Guan, Z.: Individual and combined influences of ENSO and the
Indian Ocean Dipole on the Indian Summer Monsoon, Am.
Meteorol. Soc., 17, 3141–3155,
https://doi.org/10.1175/1520-0442(2004)017<3141:IACIOE>2.0.CO;2, 2004. a
Bower, A.: A simple kinematic mechanism for mixing fluid parcels across a
meandering jet, J. Phys. Oceanogr., 21, 173–180,
https://doi.org/10.1175/1520-0485(1991)021<0173:ASKMFM>2.0.CO;2, 1991. a
Brambilla, E. and Talley, L.: Surface drifter exchange between the North
Atlantic subtropical and subpolar gyres, J. Geophys. Res.-Oceans, 111, 1–16, https://doi.org/10.1029/2005JC003146, 2006. a
Cózar, A., Echevarria, F., Gonzalez-Gordillo, J., Irigoien, X., Ubeda, B., Hernandez-Leon, S., Palma, A., Navarro, S., de Lomas, J. G., Ruiz, A.,
de Puelles, M. F., and Duarte, C.: Plastic debris in the open ocean, P. Natl. Acad. Sci. USA,
111, 10239–10244, https://doi.org/10.1073/pnas.1314705111, 2014. a
Cummings, J.: Operational multivariate ocean data assimilation, Q.
J. Roy. Meteor. Soc., 131, 3583–3604,
https://doi.org/10.1256/qj.05.105, 2005. a
Cummings, J. and Smedstad, O.: Variational data assimilation for the global
ocean, Data Assimilation for Atmospheric, Oceanic and Hydrologic
Applications, 2, 303–343, https://doi.org/10.1007/978-3-642-35088-7_13, 2013. a
Delandmeter, P. and van Sebille, E.: The Parcels v2.0 Lagrangian framework: new field interpolation schemes, Geosci. Model Dev., 12, 3571–3584, https://doi.org/10.5194/gmd-12-3571-2019, 2019. a
de Vos, A., Pattiaratchi, C. B., and Wijeratne, E. M. S.: Surface circulation and upwelling patterns around Sri Lanka, Biogeosciences, 11, 5909–5930, https://doi.org/10.5194/bg-11-5909-2014, 2014. a, b, c
Dijkstra, H.: Dynamical Oceanography, chap. 11 Equatorial ocean circulation, Springer, Heidelberg, Germany, 241–272, 2008. a
Eriksen, M., Maximenko, N., Thiel, M., Cummins, A., Lattin, G., Wilson, S.,
Hafner, J., Zellers, A., and Rifman, S.: Plastic pollution in the South
Pacific subtropical gyre, Mar. Pollut. Bull., 68, 71–76,
https://doi.org/10.1016/j.marpolbul.2012.12.021, 2013. a
Eriksen, M., Lebreton, L., Carson, H., Thiel, M., Moore, C., Borerro, J.,
Galgani, F., Ryan, P., and Reisser, J.: Plastic pollution in the world's
oceans: More than 5 trillion plastic pieces weighing over 250,000 tons afloat
at sea, PLOS ONE, 9, e111913, https://doi.org/10.1371/journal.pone.0111913, 2014. a
Escalle, L., Phillips, J., Brownjohn, M., Brouwer, S., Gupta, A., van Sebille, E., Hampton, J., and Pilling, G.: Environmental versus operational drivers of
drifting FAD beaching in the Western and Central Pacific Ocean,
Sci. Rep., 9, 1–12, https://doi.org/10.1038/s41598-019-50364-0, 2019. a
Froyland, G., Stuart, R., and van Sebille, E.: How well-connected is the
surface of the global ocean?, Chaos, 24, 033126, https://doi.org/10.1063/1.4892530, 2014. a
Gordon, A.: The brawniest retroflection, Nature, 421, 904–905,
https://doi.org/10.1038/421904a, 2003. a
Hinata, H., Ohno, K., Sagawa, N., Kataoka, T., and Takeoka, H.: Numerical
modeling of the beach process of marine plastics: 2. A diagnostic approach
with onshore-offshore advection-diffusion equations for buoyant plastics,
Mar. Pollut. Bull., 160, 1–13, https://doi.org/10.1016/j.marpolbul.2020.111548,
2020a. a
Hinata, H., Sagawa, N., Kataoka, T., and Takeoaka, H.: Numerical modeling of
the beach process of marine plastics: A probabilistic and diagnostic
approach with a particle tracking method, Mar. Pollut. Bull., 152,
1–13, https://doi.org/10.1016/j.marpolbul.2020.110910, 2020b. a
HYCOM Consortium for Data Assimilative Modeling: GOFS 3.1: 41-layer HYCOM + NCODA Global 1∕12∘ Reanalysis, available at: https://www.hycom.org/data/glbv0pt08/expt-53ptx, last access: 27 October 2020. a
Imhof, H., Sigl, R., Brauer, E., Feyl, S., Giesemann, P., Klink, S., Leupolz,
K., Löder, M., Löschel, L., Missun, J., Muszynski, S., Ramsperger,
A., Schrank, I., Speck, S., Steibl, S., Trotter, B., Winter, I., and
Laforsch, C.: Spatial and temporal variation of macro-, meso- and
microplastic abundance on a remote coral island of the Maldives, Indian
Ocean, Mar. Pollut. Bull., 116, 340–347,
https://doi.org/10.1016/j.marpolbul.2017.01.010, 2017. a, b, c, d, e
Isobe, A., Kubo, K., Tamura, Y., Kako, S., Nakashima, E., and Fujii, N.:
Selective transport of microplastics and mesoplastics by drifting in coastal
waters, Mar. Pollut. Bull., 89, 324–330,
https://doi.org/10.1016/j.marpolbul.2014.09.041, 2014. a
Lange, M. and van Sebille, E.: Parcels v0.9: prototyping a Lagrangian ocean analysis framework for the petascale age, Geosci. Model Dev., 10, 4175–4186, https://doi.org/10.5194/gmd-10-4175-2017, 2017. a
Law, K.: Plastics in the marine environment, Annu. Rev. Mar. Sci.,
9, 205–229, https://doi.org/10.1146/annurev-marine-010816-060409, 2017. a
Lebreton, L., Greer, S., and Borrero, J.: Numerical modelling of floating
debris in the world's oceans, Mar. Pollut. Bull., 64, 653–661,
https://doi.org/10.1016/j.marpolbul.2011.10.027, 2012. a, b, c
Lebreton, L., Egger, M., and Slat, B.: A global mass budget for positively
buoyant macroplastic debris in the ocean, Sci. Rep., 9, 12922,
https://doi.org/10.1038/s41598-019-49413-5, 2019. a, b, c, d
Maximenko, N., Hafner, J., and Niiler, P.: Pathways of marine debris derived
from trajectories of Lagrangian drifters, Mar. Pollut. Bull., 65,
51–62, https://doi.org/10.1016/j.marpolbul.2011.04.016, 2012. a, b, c
McAdam, R. and van Sebille, E.: Surface connectivity and interocean exchanges
from drifter-based transition matrices, J. Geophys. Res.-Oceans, 123, 514–532, https://doi.org/10.1002/2017JC013363, 2018. a
Moore, C., Moore, S., Leecaster, M., and Weisberg, S.: A comparison of plastic and plankton in the North Pacific central gyre, Mar. Pollut.
Bull., 42, 1297–1300, https://doi.org/10.1016/S0025-326X(01)00114-X, 2001. a
Morris, R.: Plastic debris in the surface waters of the South Atlantic,
Mar. Pollut. Bull., 11, 164–166, https://doi.org/10.1016/0025-326X(80)90144-7,
1980. a
Paul, S., Chakraborty, A., Pandey, P., Basu, S., Satsangi, S., and
Ravichandran, M.: Numerical simulation of Bay of Bengal circulation
features from ocean general circulation model, Mar. Geod., 32, 1–18,
https://doi.org/10.1080/01490410802661930, 2009. a, b, c
Pawlowicz, R., Hannah, C., and Rosenberger, A.: Lagrangian observations of
estuarine residence times, dispersion and trapping in the Salish Sea,
Estuar. Coast. Shelf Sci., 225, 106246, https://doi.org/10.1016/j.ecss.2019.106246,
2019. a
Peliz, A., Marchesiello, P., Dubert, J., Marta-Almeida, M., Roy, C., and
Queiroga, H.: A study of crab larvae dispersal on the Western Iberian
Shelf: Physical processes, J. Marine Syst., 68, 215–235,
https://doi.org/10.1016/j.jmarsys.2006.11.007, 2007. a
Qui, Y. and Yu, W.: Behaviour of the Wrytki Jet observed with surface
drifting buoys and satellite altimeter, Geophys. Res. Lett., 36,
1–5, https://doi.org/10.1029/2009GL039120, 2009. a, b
Reisser, J., Shaw, J., Wilcox, C., Hardesty, B., Proietti, M., Thums, M., and
Pattiaratchi, C.: Marine plastic pollution in waters around Australia:
Characteristics, concentrations, and pathways, PLoS ONE, 8, e80466,
https://doi.org/10.1371/journal.pone.0080466, 2013. a
Ryan, P.: A simple technique for counting marine debris at sea reveals steep
litter gradients between the Straits of Malacca and the Bay of
Bengal, Mar. Pollut. Bull., 69, 128–136,
https://doi.org/10.1016/j.marpolbul.2013.01.016, 2013. a
Saji, N., Goswami, B., Vinayachandran, P., and Yamagata, T.: A dipole mode in
the tropical Indian Ocean, Nature, 401, 360–363, https://doi.org/10.1038/43854,
1999. a, b, c
Schmidt, C., Krauth, T., and Wagner, S.: Export of plastic debris by rivers
into the sea, Environ. Sci. Technol., 51,
12246–12253, https://doi.org/10.1021/acs.est.7b02368, 2017. a, b, c, d
Sprintall, J., Wijffels, S., Molcard, R., and Jaya, I.: Direct estimates of the Indonesian Throughflow entering the Indian Ocean: 2004-2006, J. Geophys. Res.-Oceans, 114, 1–19, https://doi.org/10.1029/2008JC005257,
2009. a
Sprintall, J., Wijffels, S., Molcard, R., and Jaya, I.: Direct evidence of the South Java Current system in Ombai Strait, Dynam. Atmos. Oceans, 50, 140–156, https://doi.org/10.1016/j.dynatmoce.2010.02.006, 2010. a, b
The State of the ocean climate: Dipole Mode Index (DMI), available at: http://stateoftheocean.osmc.noaa.gov/sur/ind/dmi.php, last access: 27 October 2020. a
van der Mheen, M.: Indian Ocean beaching, Zenodo, https://doi.org/10.5281/zenodo.4138759, 2020. a
van der Mheen, M., van Sebille, E., and Pattiaratchi, C.: Beaching at 8 km from coastline with 0.05/5 days probability, Beaching patterns of plastic debris along the Indian Ocean rim, Copernicus Publications, https://doi.org/10.5446/47056, 2020a. a, b, c
van der Mheen, M., van Sebille, E., and Pattiaratchi, C.: Beaching at 8 km from coastline with 0.50/5 days probability, Beaching patterns of plastic debris along the Indian Ocean rim, https://doi.org/10.5446/47057, 2020b.
a, b, c
van der Mheen, M., van Sebille, E., and Pattiaratchi, C.: Beaching at 8 km from coastline with 0.95/5 days probability, Beaching patterns of plastic debris along the Indian Ocean rim, https://doi.org/10.5446/47058, 2020c. a, b, c
van Sebille, E., England, M., and Froyland, G.: Origin, dynamics and evolution of ocean garbage patches from observed surface drifters, Environ. Res. Lett., 7, 044040, https://doi.org/10.1088/1748-9326/7/4/044040, 2012. a
Wessel, P.: GSHHG A Global Self-consistent, Hierarchical, High-resolution Geography Database, available at: https://www.soest.hawaii.edu/pwessel/gshhg/,
last access: 27 October 2020. a
Wessel, P. and Smith, W.: A global self-consistent, hierarchical,
high-resolution shoreline database, J. Geophys. Res.-Sol.
Ea., 101, 8741–8743, https://doi.org/10.1029/96JB00104, 1996. a, b
Wyrtki, K.: An equatorial jet in the Indian Ocean, Science, 181, 262–264, https://doi.org/10.1126/science.181.4096.262, 1973. a
Zhang, H.: Transport of microplastics in coastal seas, Estuar. Coast.
Shelf Sci., 199, 74–86, https://doi.org/10.1016/j.ecss.2017.09.032, 2017. a, b, c
Zhang, Z., Wu, H., Peng, G., Xu, P., and Li, D.: Coastal ocean dynamics reduce the export of microplastics to the open ocean, Sci. Total
Environ., 713, 1–12, https://doi.org/10.1016/j.scitotenv.2020.136634, 2020. a
Short summary
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.
A large percentage of global ocean plastic enters the Indian Ocean through rivers, but the fate...
