FN Archimer Export Format
PT J
TI Combining an Eddy Detection Algorithm with In-Situ Measurements to Study North Brazil Current Rings
BT 
AF Subirade, Corentin
   L'Hégaret, Pierre
   Speich, Sabrina
   Laxenaire, Rémi
   Karstensen, Johannes
   CARTON, Xavier
AS 1:1,2;2:1;3:1;4:1,3;5:4;6:5;
FF 1:;2:;3:;4:;5:;6:;
C1 Laboratoire de Meteorologie Dynamique (LMD), UMR 8539 CNRS, Ecole Normale Superieure, 75005 Paris, France
   Laboratoire d’Océanologie et Géosciences (LOG), UMR 8187, Université Littoral Côte d’Opale, 59140 Dunkerque, France
   Laboratoire de L’Atmosphere et des Cyclones (LACy), UMR 8105 CNRS, Universite de La Reunion, Meteo-France, 97744 Saint-Denis, France
   GEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel, Germany
   Laboratoire d’Océanographie Physique et Spatiale (LOPS), Institut Universitaire Européen de la Mer IUEM, Université de Bretagne Occidentale (UBO), Brest, CNRS, IRD, Ifremer, 29280 Plouzané, France
C2 ENS, FRANCE
   UNIV LITTORAL COTE D'OPALE, FRANCE
   UNIV LA REUNION, FRANCE
   IFM GEOMAR, GERMANY
   UBO, FRANCE
UM LOPS
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-europe
   copubli-univ-france
IF 5
TC 2
UR https://archimer.ifremer.fr/doc/00831/94258/101662.pdf
   https://archimer.ifremer.fr/doc/00831/94258/101663.zip
LA English
DT Article
CR EUREC4A_OA
BO L'Atalante
DE ;ocean mesoscale eddies;satellite altimetry;tropical Atlantic;EUREC(4)A-OA;multi-decadal time series;spatio-temporal variability
AB North Brazil Current (NBC) rings are believed to play a key role in the Atlantic Ocean circulation and climate. Here, we use a new collection of high-resolution in-situ observations acquired during the EUREC4A-OA field experiment together with satellite altimetry to define, with unprecedented detail, the structure and evolution of these eddies. In-situ observations reveal a more complex structure than previously documented. In particular, we highlight a measurable impact of the Amazon outflow in creating a barrier layer over a large portion of the eddies. We show that this unprecedented data set allows us to estimate the accuracy of satellite altimetry gridded fields. The geostrophic velocities derived from satellite altimetry turn out to be considerably lower (up to 50% in amplitude) than the values measured by current meters. However, eddy properties as detected by TOEddies, a newly developed algorithm show to be relatively precise. For example, the eddy center and maximum azimuthal velocity contour fall within 25 ± 5 km and 16 ± 9 km, respectively, from the in-situ observed values. We apply TOEddies to 27 years of satellite altimetry to investigate the generic NBC rings behavior. We found a mean generation rate of 4.5 ± 1.1 rings per year, and a strong seasonal cycle in all eddy properties. 
PY 2023
PD APR
SO Remote Sensing
SN 2072-4292
PU MDPI
VL 15
IS 7
UT 000969814600001
DI 10.3390/rs15071897
ID 94258
ER

EF