Late summer northwestward Amazon plume pathway under the action of the North Brazil Current rings
Léa Olivier
(1, 2)
,
Gilles Reverdin
(2)
,
Jacqueline Boutin
(2)
,
R. Laxenaire
(3, 4, 5, 6)
,
Daniele Iudicone
(7)
,
S. Pesant
,
Paulo H R Calil
,
J. Horstmann
,
Douglas Couet
(8, 9)
,
J.M. Erta
,
P. Huber
,
H. Sarmento
,
A. Freire
,
Ariane Koch-Larrouy
(10)
,
Jean-Luc Vergely
(11)
,
Pierre Rousselot
(12, 13)
,
Sabrina Speich
(5)
1
AWI -
Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine
2 PROTEO - Processus et interactions de fine échelle océanique
3 LACy - Laboratoire de l'Atmosphère et des Cyclones
4 COAPS - Center for Ocean-Atmospheric Prediction Studies
5 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
6 FSU - Florida State University [Tallahassee]
7 SZN - Stazione Zoologica Anton Dohrn
8 GOSEE - Global Oceans Systems Ecology & Evolution - Tara Oceans
9 ECOMAP - ECOlogy of MArine Plankton
10 LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales
11 ACRI-ST - Analytic and Computational Research, Inc. - Earth Sciences
12 IMAGO - Instrumentation, Moyens analytiques, Observatoires en Géophysique et Océanographie
13 IRD - Institut de Recherche pour le Développement
2 PROTEO - Processus et interactions de fine échelle océanique
3 LACy - Laboratoire de l'Atmosphère et des Cyclones
4 COAPS - Center for Ocean-Atmospheric Prediction Studies
5 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
6 FSU - Florida State University [Tallahassee]
7 SZN - Stazione Zoologica Anton Dohrn
8 GOSEE - Global Oceans Systems Ecology & Evolution - Tara Oceans
9 ECOMAP - ECOlogy of MArine Plankton
10 LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales
11 ACRI-ST - Analytic and Computational Research, Inc. - Earth Sciences
12 IMAGO - Instrumentation, Moyens analytiques, Observatoires en Géophysique et Océanographie
13 IRD - Institut de Recherche pour le Développement
Léa Olivier
- Fonction : Auteur
- PersonId : 803847
- ORCID : 0000-0001-9014-0979
- IdRef : 27093846X
Gilles Reverdin
- Fonction : Auteur
- PersonId : 6139
- IdHAL : gilles-reverdin
Jacqueline Boutin
- Fonction : Auteur
- PersonId : 180358
- IdHAL : jacqueline-boutin
- ORCID : 0000-0003-2845-4912
- IdRef : 143435353
R. Laxenaire
- Fonction : Auteur
- PersonId : 178707
- IdHAL : remi-laxenaire
- ORCID : 0000-0001-5157-1821
Daniele Iudicone
- Fonction : Auteur
- PersonId : 757541
- ORCID : 0000-0002-7473-394X
- IdRef : 139806903
S. Pesant
- Fonction : Auteur
Paulo H R Calil
- Fonction : Auteur
J. Horstmann
- Fonction : Auteur
J.M. Erta
- Fonction : Auteur
P. Huber
- Fonction : Auteur
H. Sarmento
- Fonction : Auteur
A. Freire
- Fonction : Auteur
Ariane Koch-Larrouy
- Fonction : Auteur
- PersonId : 862096
Sabrina Speich
- Fonction : Auteur
- PersonId : 1274692
- ORCID : 0000-0002-5452-8287
- IdRef : 139807144
Résumé
The North Brazil Current (NBC) flows offshore of the mouth of the Amazon River and seasonally sheds anticyclonic rings (NBC rings) that propagate northwestward and interact with the Amazon River plume (ARP). Mesoscale features have a high temporal variability that is hard to monitor from current weekly and monthly sea surface salinity (SSS) satellite fields. Novel SSS fields with a higher temporal resolution analyzed together with satellite geostrophic currents, chlorophyll-a, and wind speed and in-situ data from the “Microbiomes cruise” on the SV Tara in August–September 2021 revealed a late summer freshwater pathway, which was not well documented in earlier studies. By combining these datasets, we improved the characterization of summer ARP pathways. In 2021, the ARP was a succession of freshwater patches cut off from the main plume by the NBC rings. A patch of about 200.000 km2 with salinity <33.5 pss was observed in September 2021, bringing 0.5 Sv of Amazon water northwestward in a period where the mean ocean currents lead to eastward transport. This patch was shallow, very stratified, and it created a surface steric-height anomaly that was identified as an anticyclonic feature in altimetric sea level products. Once separated from the NBC retroflection, it was mainly driven by Ekman currents. Other similar patches were observed during the 2021 summer, leading to a strong intermittency of the ARP transport. They strongly contributed to make 2021 the year with the largest northwestward freshwater transport in late summer within the 2010–2021 time-period investigated. This freshwater transport pathway is important for all plume-related phenomena, and show the ability of combined SMOS and SMAP data to accurately represent the day-to-day SSS variability.
Domaines
OcéanographieFormat du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Late summer northwestward Amazon plume pathway under the action of the North Brazil Current rings
|
Résumé |
en
The North Brazil Current (NBC) flows offshore of the mouth of the Amazon River and seasonally sheds anticyclonic rings (NBC rings) that propagate northwestward and interact with the Amazon River plume (ARP). Mesoscale features have a high temporal variability that is hard to monitor from current weekly and monthly sea surface salinity (SSS) satellite fields. Novel SSS fields with a higher temporal resolution analyzed together with satellite geostrophic currents, chlorophyll-a, and wind speed and in-situ data from the “Microbiomes cruise” on the SV Tara in August–September 2021 revealed a late summer freshwater pathway, which was not well documented in earlier studies. By combining these datasets, we improved the characterization of summer ARP pathways. In 2021, the ARP was a succession of freshwater patches cut off from the main plume by the NBC rings. A patch of about 200.000 km2 with salinity <33.5 pss was observed in September 2021, bringing 0.5 Sv of Amazon water northwestward in a period where the mean ocean currents lead to eastward transport. This patch was shallow, very stratified, and it created a surface steric-height anomaly that was identified as an anticyclonic feature in altimetric sea level products. Once separated from the NBC retroflection, it was mainly driven by Ekman currents. Other similar patches were observed during the 2021 summer, leading to a strong intermittency of the ARP transport. They strongly contributed to make 2021 the year with the largest northwestward freshwater transport in late summer within the 2010–2021 time-period investigated. This freshwater transport pathway is important for all plume-related phenomena, and show the ability of combined SMOS and SMAP data to accurately represent the day-to-day SSS variability.
|
Auteur(s) |
Léa Olivier
1, 2
, Gilles Reverdin
2
, Jacqueline Boutin
2
, R. Laxenaire
3, 4, 5, 6
, Daniele Iudicone
7
, S. Pesant
, Paulo H R Calil
, J. Horstmann
, Douglas Couet
8, 9
, J.M. Erta
, P. Huber
, H. Sarmento
, A. Freire
, Ariane Koch-Larrouy
10
, Jean-Luc Vergely
11
, Pierre Rousselot
12, 13
, Sabrina Speich
5
1
AWI -
Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine
( 313190 )
- Am Handelshafen 12, 27570 Bremerhaven, Bundesrepublik Deutschland
- Allemagne
2
PROTEO -
Processus et interactions de fine échelle océanique
( 541830 )
- France
3
LACy -
Laboratoire de l'Atmosphère et des Cyclones
( 70806 )
- Faculté des Sciences et techniques - Université de La Réunion 15 avenue René Cassin CS92003 97744 SAINT DENIS CEDEX 9
- France
4
COAPS -
Center for Ocean-Atmospheric Prediction Studies
( 416063 )
- Florida State University , 2000 Levy Avenue , Tallahassee, FL 32306-2741
- États-Unis
5
LMD -
Laboratoire de Météorologie Dynamique (UMR 8539)
( 541698 )
- LMD ENS 24 Rue Lhomond 75231 Paris Cedex 05
- France
6
FSU -
Florida State University [Tallahassee]
( 6406 )
- 600 W College Ave, Tallahassee, FL 32306
- États-Unis
7
SZN -
Stazione Zoologica Anton Dohrn
( 245020 )
- Villa Comunale, 80121 Napoli
- Italie
8
GOSEE -
Global Oceans Systems Ecology & Evolution - Tara Oceans
( 565014 )
- 3 rue Michel-Ange, 75016 Paris
- France
9
ECOMAP -
ECOlogy of MArine Plankton
( 572106 )
- Place Georges Teissier
29680 Roscoff
- France
10
LEGOS -
Laboratoire d'études en Géophysique et océanographie spatiales
( 733 )
- 14 avenue Edouard Belin 31400 Toulouse
- France
11
ACRI-ST -
Analytic and Computational Research, Inc. - Earth Sciences
( 308493 )
- 260 route du Pin Montard 06904 Sophia-Antipolis
- France
12
IMAGO -
Instrumentation, Moyens analytiques, Observatoires en Géophysique et Océanographie
( 86893 )
- France
13
IRD -
Institut de Recherche pour le Développement
( 67872 )
- Siège
Le Sextant
44, bd de Dunkerque
CS 90009
13572 Marseille cedex 02
- France
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Langue du document |
Anglais
|
Nom de la revue |
|
Volume |
307
|
Page/Identifiant |
114165
|
Date de publication |
2024
|
Domaine(s) |
|
Projet(s) Européen(s) |
|
Données associées | |
Mots-clés |
en
Tropical Atlantic Ocean, Amazon River plume, North Brazil current rings, Ekman transport, Sea salinity
|
DOI | 10.1016/j.rse.2024.114165 |
Origine :
Publication financée par une institution
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