The surface thermal signature and air–sea coupling over the Agulhas rings propagating in the South Atlantic Ocean interior
The surface signature of Agulhas rings propagating across the South Atlantic Ocean is observed based on three independent data sets: Advanced Microwave Scanning Radiometer for the Earth Observing System/Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) (TMI/AMSR-E) satellite sea surf...
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ftdoajarticles:oai:doaj.org/article:65213a36704940be92b2ab315b0c6cd3 2023-05-15T18:20:58+02:00 The surface thermal signature and air–sea coupling over the Agulhas rings propagating in the South Atlantic Ocean interior J. M. A. C. Souza B. Chapron E. Autret 2014-07-01T00:00:00Z https://doi.org/10.5194/os-10-633-2014 https://doaj.org/article/65213a36704940be92b2ab315b0c6cd3 EN eng Copernicus Publications http://www.ocean-sci.net/10/633/2014/os-10-633-2014.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-10-633-2014 https://doaj.org/article/65213a36704940be92b2ab315b0c6cd3 Ocean Science, Vol 10, Iss 4, Pp 633-644 (2014) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2014 ftdoajarticles https://doi.org/10.5194/os-10-633-2014 2022-12-30T21:08:44Z The surface signature of Agulhas rings propagating across the South Atlantic Ocean is observed based on three independent data sets: Advanced Microwave Scanning Radiometer for the Earth Observing System/Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) (TMI/AMSR-E) satellite sea surface temperature, Argo profiling floats and a merged winds product derived from scatterometer observations and reanalysis results. A persistent pattern of cold (negative) sea surface temperature (SST) anomalies in the eddy core, with warm (positive) anomalies at the boundary, is revealed. This pattern contrasts with the classical idea of a warm core anticyclone. Taking advantage of a moving reference frame corresponding to the altimetry-detected Agulhas rings, modifications of the surface winds by the ocean-induced currents and SST gradients are evaluated using satellite SST and wind observations. As obtained, the averaged stationary thermal expression and mean eddy-induced circulation are coupled to the marine atmospheric boundary layer, leading to surface wind anomalies. Consequently, an average Ekman pumping associated with these mean surface wind variations consistently emerges. This average Ekman pumping is found to explain very well the SST anomaly signatures of the detected Agulhas rings. Particularly, this mechanism seems to be the key factor determining that these anticyclonic eddies exhibit stationary imprints of cold SST anomalies near their core centers. A residual phase with the maximum sea surface height (SSH) anomaly and wind speed anomaly is found to the right of the mean wind direction, apparently maintaining a coherent stationary thermal expression coupled to the marine atmospheric boundary layer. Article in Journal/Newspaper South Atlantic Ocean Directory of Open Access Journals: DOAJ Articles Ocean Science 10 4 633 644 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 J. M. A. C. Souza B. Chapron E. Autret The surface thermal signature and air–sea coupling over the Agulhas rings propagating in the South Atlantic Ocean interior |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
The surface signature of Agulhas rings propagating across the South Atlantic Ocean is observed based on three independent data sets: Advanced Microwave Scanning Radiometer for the Earth Observing System/Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) (TMI/AMSR-E) satellite sea surface temperature, Argo profiling floats and a merged winds product derived from scatterometer observations and reanalysis results. A persistent pattern of cold (negative) sea surface temperature (SST) anomalies in the eddy core, with warm (positive) anomalies at the boundary, is revealed. This pattern contrasts with the classical idea of a warm core anticyclone. Taking advantage of a moving reference frame corresponding to the altimetry-detected Agulhas rings, modifications of the surface winds by the ocean-induced currents and SST gradients are evaluated using satellite SST and wind observations. As obtained, the averaged stationary thermal expression and mean eddy-induced circulation are coupled to the marine atmospheric boundary layer, leading to surface wind anomalies. Consequently, an average Ekman pumping associated with these mean surface wind variations consistently emerges. This average Ekman pumping is found to explain very well the SST anomaly signatures of the detected Agulhas rings. Particularly, this mechanism seems to be the key factor determining that these anticyclonic eddies exhibit stationary imprints of cold SST anomalies near their core centers. A residual phase with the maximum sea surface height (SSH) anomaly and wind speed anomaly is found to the right of the mean wind direction, apparently maintaining a coherent stationary thermal expression coupled to the marine atmospheric boundary layer. |
format |
Article in Journal/Newspaper |
author |
J. M. A. C. Souza B. Chapron E. Autret |
author_facet |
J. M. A. C. Souza B. Chapron E. Autret |
author_sort |
J. M. A. C. Souza |
title |
The surface thermal signature and air–sea coupling over the Agulhas rings propagating in the South Atlantic Ocean interior |
title_short |
The surface thermal signature and air–sea coupling over the Agulhas rings propagating in the South Atlantic Ocean interior |
title_full |
The surface thermal signature and air–sea coupling over the Agulhas rings propagating in the South Atlantic Ocean interior |
title_fullStr |
The surface thermal signature and air–sea coupling over the Agulhas rings propagating in the South Atlantic Ocean interior |
title_full_unstemmed |
The surface thermal signature and air–sea coupling over the Agulhas rings propagating in the South Atlantic Ocean interior |
title_sort |
surface thermal signature and air–sea coupling over the agulhas rings propagating in the south atlantic ocean interior |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/os-10-633-2014 https://doaj.org/article/65213a36704940be92b2ab315b0c6cd3 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Ocean Science, Vol 10, Iss 4, Pp 633-644 (2014) |
op_relation |
http://www.ocean-sci.net/10/633/2014/os-10-633-2014.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-10-633-2014 https://doaj.org/article/65213a36704940be92b2ab315b0c6cd3 |
op_doi |
https://doi.org/10.5194/os-10-633-2014 |
container_title |
Ocean Science |
container_volume |
10 |
container_issue |
4 |
container_start_page |
633 |
op_container_end_page |
644 |
_version_ |
1766199941282136064 |