Sea ice in the Weddell Sea and its relationship with the South Atlantic Subtropical High and precipitation in South America
Abstract This study aims to evaluate the position and intensity of the South Atlantic Subtropical High (SASH), related to sea ice extent (SIE) retraction and expansion in the Weddell Sea, assessing precipitation in South America. We assess the difference between atmospheric fields related to SIE (fo...
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ftdoajarticles:oai:doaj.org/article:8bc5bd845f9043729b6be47a93de3290 2023-05-15T18:17:32+02:00 Sea ice in the Weddell Sea and its relationship with the South Atlantic Subtropical High and precipitation in South America CAMILA B. CARPENEDO TÉRCIO AMBRIZZI RAFAEL CESAR SILVA 2022-10-01T00:00:00Z https://doi.org/10.1590/0001-3765202220211623 https://doaj.org/article/8bc5bd845f9043729b6be47a93de3290 EN eng Academia Brasileira de Ciências http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652022000801101&tlng=en https://doaj.org/toc/1678-2690 1678-2690 doi:10.1590/0001-3765202220211623 https://doaj.org/article/8bc5bd845f9043729b6be47a93de3290 Anais da Academia Brasileira de Ciências, Vol 94, Iss suppl 4 (2022) sea ice south atlantic aubtropical high weddell sea south america south american monsoon system Science Q article 2022 ftdoajarticles https://doi.org/10.1590/0001-3765202220211623 2022-12-30T20:31:58Z Abstract This study aims to evaluate the position and intensity of the South Atlantic Subtropical High (SASH), related to sea ice extent (SIE) retraction and expansion in the Weddell Sea, assessing precipitation in South America. We assess the difference between atmospheric fields related to SIE (four most intense retraction events minus four most intense expansion events) in February. To this end, we used NSIDC SIE, ERA-5 reanalysis, CHIRPS precipitation, ICOADS SST, ONI/SAM indexes (CPC/NOAA). In the following month, under neutral ENSO and SAM, we observed tropospheric warming in the Weddell Sea and cooling in the mid-latitudes South Atlantic. There is a weakening of both the Weddell Sea circumpolar low and the high pressures between tropical and subtropical latitudes, in addition to the equatorward shift of the Ferrel cell. Therefore, SASH weakens and contracts, resulting in a reduction of the tropical Atlantic moisture supply to South America and negative precipitation anomalies in the tropical region - similar to the suppression pattern of the South Atlantic Convergence Zone. Our results suggest that SIE retraction (expansion) in the Weddell Sea may contribute to the weakening (strengthening) of the SASH and an early-ending (longer-ending) or drier-ending (wetter-ending) rainy season in tropical South America. Article in Journal/Newspaper Sea ice Weddell Sea Directory of Open Access Journals: DOAJ Articles Weddell Sea Weddell Anais da Academia Brasileira de Ciências 94 suppl 4 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
sea ice south atlantic aubtropical high weddell sea south america south american monsoon system Science Q |
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sea ice south atlantic aubtropical high weddell sea south america south american monsoon system Science Q CAMILA B. CARPENEDO TÉRCIO AMBRIZZI RAFAEL CESAR SILVA Sea ice in the Weddell Sea and its relationship with the South Atlantic Subtropical High and precipitation in South America |
topic_facet |
sea ice south atlantic aubtropical high weddell sea south america south american monsoon system Science Q |
description |
Abstract This study aims to evaluate the position and intensity of the South Atlantic Subtropical High (SASH), related to sea ice extent (SIE) retraction and expansion in the Weddell Sea, assessing precipitation in South America. We assess the difference between atmospheric fields related to SIE (four most intense retraction events minus four most intense expansion events) in February. To this end, we used NSIDC SIE, ERA-5 reanalysis, CHIRPS precipitation, ICOADS SST, ONI/SAM indexes (CPC/NOAA). In the following month, under neutral ENSO and SAM, we observed tropospheric warming in the Weddell Sea and cooling in the mid-latitudes South Atlantic. There is a weakening of both the Weddell Sea circumpolar low and the high pressures between tropical and subtropical latitudes, in addition to the equatorward shift of the Ferrel cell. Therefore, SASH weakens and contracts, resulting in a reduction of the tropical Atlantic moisture supply to South America and negative precipitation anomalies in the tropical region - similar to the suppression pattern of the South Atlantic Convergence Zone. Our results suggest that SIE retraction (expansion) in the Weddell Sea may contribute to the weakening (strengthening) of the SASH and an early-ending (longer-ending) or drier-ending (wetter-ending) rainy season in tropical South America. |
format |
Article in Journal/Newspaper |
author |
CAMILA B. CARPENEDO TÉRCIO AMBRIZZI RAFAEL CESAR SILVA |
author_facet |
CAMILA B. CARPENEDO TÉRCIO AMBRIZZI RAFAEL CESAR SILVA |
author_sort |
CAMILA B. CARPENEDO |
title |
Sea ice in the Weddell Sea and its relationship with the South Atlantic Subtropical High and precipitation in South America |
title_short |
Sea ice in the Weddell Sea and its relationship with the South Atlantic Subtropical High and precipitation in South America |
title_full |
Sea ice in the Weddell Sea and its relationship with the South Atlantic Subtropical High and precipitation in South America |
title_fullStr |
Sea ice in the Weddell Sea and its relationship with the South Atlantic Subtropical High and precipitation in South America |
title_full_unstemmed |
Sea ice in the Weddell Sea and its relationship with the South Atlantic Subtropical High and precipitation in South America |
title_sort |
sea ice in the weddell sea and its relationship with the south atlantic subtropical high and precipitation in south america |
publisher |
Academia Brasileira de Ciências |
publishDate |
2022 |
url |
https://doi.org/10.1590/0001-3765202220211623 https://doaj.org/article/8bc5bd845f9043729b6be47a93de3290 |
geographic |
Weddell Sea Weddell |
geographic_facet |
Weddell Sea Weddell |
genre |
Sea ice Weddell Sea |
genre_facet |
Sea ice Weddell Sea |
op_source |
Anais da Academia Brasileira de Ciências, Vol 94, Iss suppl 4 (2022) |
op_relation |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652022000801101&tlng=en https://doaj.org/toc/1678-2690 1678-2690 doi:10.1590/0001-3765202220211623 https://doaj.org/article/8bc5bd845f9043729b6be47a93de3290 |
op_doi |
https://doi.org/10.1590/0001-3765202220211623 |
container_title |
Anais da Academia Brasileira de Ciências |
container_volume |
94 |
container_issue |
suppl 4 |
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1766191829778169856 |