Anticyclonic Eddies Connecting the Western Boundaries of Indian and Atlantic Oceans

Journal of Geophysical Research: Oceans - Tập 123 Số 11 - Trang 7651-7677 - 2018
Rémi Laxenaire1,2,3, Sabrina Speich3, Bruno Blanke4, Alexis Chaigneau5,6,7, Cori Pegliasco7, Alexandre Stegner3
1COAPS - Center for Ocean-Atmospheric Prediction Studies (Florida State University , 2000 Levy Avenue , Tallahassee, FL 32306-2741 - United States)
2FSU - Florida State University [Tallahassee] (600 W College Ave, Tallahassee, FL 32306 - United States)
3Laboratoire de Météorologie Dynamique, LMD‐IPSL, UMR 8539, École Polytechnique, ENS, CNRS Paris France
4Laboratoire d'Océanographie Physique et Spatiale, UMR 6523, CNRS, Ifremer, IRD, UBO Brest France
5Institut de Recherches Halieutiques et Océanologiques du Bénin, Cotonou, Benin
6International Chair in Mathematical Physics and Applications (UNESCO Chair) University of Abomey‐Calavi Cotonou Benin
7Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, UMR, CNES, CNRS, IRD, UPS Toulouse France

Tóm tắt

AbstractThe Indo‐Atlantic interocean exchanges achieved by Agulhas Rings are tightly linked to global ocean circulation and climate. Yet they are still poorly understood because they are difficult to identify and follow. We propose here an original assessment on Agulhas Rings, achieved by TOEddies, a new eddy identification and tracking algorithm that we applied over 24 years of satellite altimetry. Its main novelty lies in the detection of eddy splitting and merging events. These are particularly abundant and significantly impact the concept of a trajectory associated with a single eddy, which becomes less obvious than previously admitted. To overcome this complication, we have defined a network of segments that group together in relatively complex trajectories. Such a network provides an original assessment of the routes and the history of Agulhas Rings. It links 730,481 eddies into 6,363 segments that cluster into Agulhas Ring trajectories of different orders. Such an order depends on the affiliation of the eddies and segments, in a similar way as a tree of life. Among them, we have identified 122 order 0 trajectories that can be considered as the major trajectories associated to a single eddy, albeit it has undergone itself splitting and merging events. Despite the disappearance of many eddies in the altimeter signal in the Cape Basin, a significant fraction can be followed from the Indian Ocean to the South Brazil Current with, on average, 3.5 years to cross the entire South Atlantic.

Từ khóa


Tài liệu tham khảo

10.1029/1998JC900047

10.1029/2011JC007140

10.1002/2016GL071269

10.1029/2010JC006236

10.1029/94JC00383

10.1038/nature19853

10.1038/nature09983

10.1002/grl.50243

10.1038/nature07426

10.1029/2008GL035132

10.1016/S0967-0645(02)00379-X

10.1016/S0967-0645(02)00377-6

Boyer T. P. Antonov J. I. Baranova O. K. Coleman C. Garcia H. E. Grodsky A. Johnson D. R. Locarnini R. A. Mishonov A. V. O'Brien T. D. et al. (2013).World ocean database.

10.1175/1520-0485(1995)025<0902:AEASVU>2.0.CO;2

10.1002/2014GL061770

10.1023/A:1013779219578

10.1002/2017JC012969

10.1016/j.pocean.2009.07.012

10.1016/j.pocean.2008.10.013

10.1029/2011JC007134

10.1029/2004JC002815

10.1175/1520-0485(1998)028<0433:GVOTFB>2.0.CO;2

10.1016/j.pocean.2011.01.002

10.1029/2007GL030812

10.1007/s10236-017-1089-5

10.1126/science.215.4529.161

10.1175/1520-0485(1990)020<0758:WMOME>2.0.CO;2

10.1016/j.dsr.2010.07.008

10.1016/j.dsr.2010.07.004

10.1029/2006JC003952

10.1029/1999JC000201

10.1175/2399.1

Duacs/AVISO+(2014).A new version of SSALTO/Duacs products available in April 2014. Version 1.1 CNES. [Available athttp://www.aviso.altimetry.fr/fileadmin/documents/data/duacs/Duacs2014.pdf.].

Duacs/AVISO+, 2015, SSALTO/DUACS user handbook:(M) SLA and (M) ADT near‐real time and delayed time products, CLS‐DOS‐NT‐06‐034, 6, 74

Duacs/AVISO+(2017).Mesoscale eddy trajectory Atlas product handbook. SALP‐MU‐P‐EA‐23126‐CLS.

10.2989/025776191784287574

Edelsbrunner H., 2010, Computational topology: An introduction

10.1007/s00454-002-2885-2

10.1175/JPO-D-14-0254.1

10.1038/sdata.2015.28

10.1002/2015JC011047

10.1029/1999JC900060

10.1357/0022240973224175

10.1126/science.227.4690.1030

10.1029/JC095iC03p03117

10.1029/92JC00485

10.1029/2007GL032100

10.1016/j.dsr.2018.08.005

10.1017/jfm.2013.391

10.1016/j.dsr2.2013.10.015

10.1175/1520-0485(2004)034<1610:SOASVU>2.0.CO;2

10.1029/95JC02333

10.1002/2017JC013158

10.1175/JPO2826.1

10.1007/BF02233852

10.1175/JTECH-D-17-0010.1

10.1029/2011GL048588

10.1002/2015JC011435

Lumpkin R. &Pazos M.(2007).Measuring surface currents with Surface Velocity Program drifters: The instrument its data and some recent results.Lagrangian analysis and prediction of coastal and ocean dynamics(pp.39–67).

Lutjeharms J. R. E., 2006, The Agulhas Current

10.1175/1520-0485(1988)018<1570:TROTAC>2.0.CO;2

10.1038/325138a0

10.1175/JTECH-D-14-00019.1

10.1016/j.procs.2016.05.491

10.1029/1998JC900131

10.1029/RG023i002p00165

10.1017/S0022112088002435

10.1002/2014JC010176

10.1175/2009JTECHO725.1

10.1016/0011-7471(70)90059-8

10.1016/0198-0149(86)90106-8

10.1002/2015GL065625

10.1002/2015JC010950

10.1029/2005JC002945

10.1029/2006GL026854

10.5194/os-12-1067-2016

10.5194/os-12-1249-2016

10.1017/S0022112075001504

10.1029/2010JC006505

10.1002/2014GL061773

10.1029/2009GL037987

10.1002/grl.50782

10.1029/1998JC900099

Sangrà P., 2005, Life history of an anticyclonic eddy, Journal of Geophysical Research, 03021

Schlax M. G. &Chelton D. B.(2016).The “growing method” of eddy identification and tracking in two and three dimensions.

10.1029/2001JC000804

10.1029/1999JC000046

10.1175/1520-0485(1994)024<2129:MAMOTM>2.0.CO;2

10.1357/002224000763485755

10.1126/science.277.5334.1956

Souza J. M. A. C., 2011, Estimation of the Agulhas ring impacts on meridional heat fluxes and transport using ARGO floats and satellite data, Geophysical Research Letters, 28, L21602

10.5194/os-7-317-2011

10.1175/1520-0485(1997)027<1743:GCOOVE>2.0.CO;2

10.1109/TVCG.2017.2743938

10.1175/2010JPO4602.1

10.1175/JPO3108.1

10.1029/2009JC005585

10.1175/1520-0485(2004)034<1884:OTASMF>2.0.CO;2

10.1126/science.1261447

10.1002/2015JC011620

10.1002/2015GL064089

10.1175/1520-0485(2001)031<2385:SOTAOC>2.0.CO;2

10.1175/1520-0485(1999)029<2266:IOIEOT>2.0.CO;2

10.1016/S0921-8181(02)00121-2

10.1016/0167-2789(91)90088-Q

10.1109/TVCG.2011.162

10.1029/1999JC900062

10.5194/os-10-39-2014

10.5194/os-11-361-2015

Thông tin
Thông tin xuất bản

Journal of Geophysical Research: Oceans

Tập 123 Số 11

7651-7677

Thông tin tác giả