The Relative Contribution of the Water Masses to the Sea Level Variation in the South Atlantic
The sea level changes due to steric contributions have become more relevant in the past decades because oceans store the largest part of the heat from anthropogenic greenhouse gas emissions. Recent studies showed evidence that the sea level variation is mainly attributed to the first 2000 m of the w...
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Biblioteca Digital de Teses e Dissertações da USP
2023
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ftunivsaopaulo:oai:teses.usp.br:tde-29052023-141351 2023-07-16T03:52:45+02:00 The Relative Contribution of the Water Masses to the Sea Level Variation in the South Atlantic A Contribuição Relativa das Massas d´água na Variação do Nível do Mar no Atlântico Sul Rocha, Thamirys Cavaton Sato, Olga Tiemi 2023-03-24 application/pdf https://www.teses.usp.br/teses/disponiveis/21/21135/tde-29052023-141351/ https://doi.org/10.11606/D.21.2023.tde-29052023-141351 en eng Biblioteca Digital de Teses e Dissertações da USP Universidade de São Paulo Instituto Oceanográfico https://www.teses.usp.br/teses/disponiveis/21/21135/tde-29052023-141351/ doi:10.11606/D.21.2023.tde-29052023-141351 Reter o conteúdo por motivos de patente, publicação e/ou direitos autoriais. Água Central do Atlântico Sul Água Circumpolar Água Intermediária Antártica Água Profunda do Atlântico Norte Água Tropical espessura das massas d'água por efeitos estéricos Tropical Surface Water South Atlantic Central Water North Atlantic Deep Water Circumpolar Deep Water Antarctic Intermediate Water Water-mass layer thickness due to steric contribution Dissertação (Mestrado) 2023 ftunivsaopaulo https://doi.org/10.11606/D.21.2023.tde-29052023-141351 2023-06-24T23:15:11Z The sea level changes due to steric contributions have become more relevant in the past decades because oceans store the largest part of the heat from anthropogenic greenhouse gas emissions. Recent studies showed evidence that the sea level variation is mainly attributed to the first 2000 m of the water column. Therefore, our purpose was to quantify how much of the individual water masses variation is correlated to the sea level changes. To quantify the layer thickness variability of the Tropical Surface Water (TSW), South Atlantic Central Water (SACW), Antarctic Intermediate Water (AAIW), Circumpolar Water (CDW), the North Atlantic (NADW), and the lower layers (LOWER), we used WOA18 data, altimetric satellites data, and the outputs from ECCO and HYCOM models. The layer thickness had seasonal and interannual variability, but only the TSW, SACW, and AAIW were consistent between the models. The main process observed on ECCO analysis was an alternating expansion and contraction between consecutive water masses, while on HYCOM, only the LOWER expanded and the other water masses contracted. The TSW (ECCO) showed the largest contribution (44% to 90%) to the sea level, followed by the SACW (0% to 44%), AAIW (0% to 44%), UCDW (~11%), UNADW(~11%), and LOWER (5%) between 0ºS and 40ºS. The TSW was the only water mass whose relative explained variance decreased southward, while the other five water masses increased southward. The SACW and AAIW had a higher explained variance (11% - 88%) between 40ºS to 50ºS, and the LOWER had the highest value (>44%) between 50ºS and 55ºS. HYCOM results were similar to ECCO, except that the TSW explained variance was higher (44% to 90%) only between 0ºS to 25ºS and SACW (44% to 90%) was between 25ºS to 45ºS. The correlation between the altimeter sea level and ECCO showed higher values (>70%) from 0ºS 10ºS to 40ºW--15ºE. This indicates that the hypothesis of this work is valid for this region. Even though HYCOM presented a correlation higher than 75% for most of the basin, the layer ... Master Thesis Antarc* Antarctic Antártica NADW North Atlantic Deep Water North Atlantic University of São Paulo: Digital Library of Theses and Dissertations Antarctic |
institution |
Open Polar |
collection |
University of São Paulo: Digital Library of Theses and Dissertations |
op_collection_id |
ftunivsaopaulo |
language |
English |
topic |
Água Central do Atlântico Sul Água Circumpolar Água Intermediária Antártica Água Profunda do Atlântico Norte Água Tropical espessura das massas d'água por efeitos estéricos Tropical Surface Water South Atlantic Central Water North Atlantic Deep Water Circumpolar Deep Water Antarctic Intermediate Water Water-mass layer thickness due to steric contribution |
spellingShingle |
Água Central do Atlântico Sul Água Circumpolar Água Intermediária Antártica Água Profunda do Atlântico Norte Água Tropical espessura das massas d'água por efeitos estéricos Tropical Surface Water South Atlantic Central Water North Atlantic Deep Water Circumpolar Deep Water Antarctic Intermediate Water Water-mass layer thickness due to steric contribution Rocha, Thamirys Cavaton The Relative Contribution of the Water Masses to the Sea Level Variation in the South Atlantic |
topic_facet |
Água Central do Atlântico Sul Água Circumpolar Água Intermediária Antártica Água Profunda do Atlântico Norte Água Tropical espessura das massas d'água por efeitos estéricos Tropical Surface Water South Atlantic Central Water North Atlantic Deep Water Circumpolar Deep Water Antarctic Intermediate Water Water-mass layer thickness due to steric contribution |
description |
The sea level changes due to steric contributions have become more relevant in the past decades because oceans store the largest part of the heat from anthropogenic greenhouse gas emissions. Recent studies showed evidence that the sea level variation is mainly attributed to the first 2000 m of the water column. Therefore, our purpose was to quantify how much of the individual water masses variation is correlated to the sea level changes. To quantify the layer thickness variability of the Tropical Surface Water (TSW), South Atlantic Central Water (SACW), Antarctic Intermediate Water (AAIW), Circumpolar Water (CDW), the North Atlantic (NADW), and the lower layers (LOWER), we used WOA18 data, altimetric satellites data, and the outputs from ECCO and HYCOM models. The layer thickness had seasonal and interannual variability, but only the TSW, SACW, and AAIW were consistent between the models. The main process observed on ECCO analysis was an alternating expansion and contraction between consecutive water masses, while on HYCOM, only the LOWER expanded and the other water masses contracted. The TSW (ECCO) showed the largest contribution (44% to 90%) to the sea level, followed by the SACW (0% to 44%), AAIW (0% to 44%), UCDW (~11%), UNADW(~11%), and LOWER (5%) between 0ºS and 40ºS. The TSW was the only water mass whose relative explained variance decreased southward, while the other five water masses increased southward. The SACW and AAIW had a higher explained variance (11% - 88%) between 40ºS to 50ºS, and the LOWER had the highest value (>44%) between 50ºS and 55ºS. HYCOM results were similar to ECCO, except that the TSW explained variance was higher (44% to 90%) only between 0ºS to 25ºS and SACW (44% to 90%) was between 25ºS to 45ºS. The correlation between the altimeter sea level and ECCO showed higher values (>70%) from 0ºS 10ºS to 40ºW--15ºE. This indicates that the hypothesis of this work is valid for this region. Even though HYCOM presented a correlation higher than 75% for most of the basin, the layer ... |
author2 |
Sato, Olga Tiemi |
format |
Master Thesis |
author |
Rocha, Thamirys Cavaton |
author_facet |
Rocha, Thamirys Cavaton |
author_sort |
Rocha, Thamirys Cavaton |
title |
The Relative Contribution of the Water Masses to the Sea Level Variation in the South Atlantic |
title_short |
The Relative Contribution of the Water Masses to the Sea Level Variation in the South Atlantic |
title_full |
The Relative Contribution of the Water Masses to the Sea Level Variation in the South Atlantic |
title_fullStr |
The Relative Contribution of the Water Masses to the Sea Level Variation in the South Atlantic |
title_full_unstemmed |
The Relative Contribution of the Water Masses to the Sea Level Variation in the South Atlantic |
title_sort |
relative contribution of the water masses to the sea level variation in the south atlantic |
publisher |
Biblioteca Digital de Teses e Dissertações da USP |
publishDate |
2023 |
url |
https://www.teses.usp.br/teses/disponiveis/21/21135/tde-29052023-141351/ https://doi.org/10.11606/D.21.2023.tde-29052023-141351 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antártica NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Antártica NADW North Atlantic Deep Water North Atlantic |
op_relation |
https://www.teses.usp.br/teses/disponiveis/21/21135/tde-29052023-141351/ doi:10.11606/D.21.2023.tde-29052023-141351 |
op_rights |
Reter o conteúdo por motivos de patente, publicação e/ou direitos autoriais. |
op_doi |
https://doi.org/10.11606/D.21.2023.tde-29052023-141351 |
_version_ |
1771547036510846976 |