Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis
We analyzed the ability of the Estimating the Circulation and Climate of the Ocean – Phase II (ECCO2) reanalysis to represent the hydrographic properties and variability of Antarctic Bottom Water (AABW) in the Southern Ocean. We used a 20-year (1992–2011) observational database to perform comparison...
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ftunivfurg:oai:repositorio.furg.br:1/5864 2023-11-12T04:07:06+01:00 Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis Azeneu, Marina do Valle Chagas Duarte, Rodrigo Kerr Pereira Mata, Mauricio Magalhães 2014 application/pdf http://repositorio.furg.br/handle/1/5864 https://doi.org/10.5194/os-10-923-2014 eng eng AZENEU, Marina do Valle Chagas; DUARTE, Rodrigo Kerr Pereira; MATA, Mauricio Magalhães. Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis. Ocean Science, v. 10, n.6, p.923–946, 2014. Disponível em: <http://www.ocean-sci.net/10/923/2014/os-10-923-2014.html>. Acesso em 22 Jan 2016. 2005-7172 1738-5261 http://repositorio.furg.br/handle/1/5864 doi:10.5194/os-10-923-2014 open access article 2014 ftunivfurg https://doi.org/10.5194/os-10-923-2014 2023-10-24T21:01:51Z We analyzed the ability of the Estimating the Circulation and Climate of the Ocean – Phase II (ECCO2) reanalysis to represent the hydrographic properties and variability of Antarctic Bottom Water (AABW) in the Southern Ocean. We used a 20-year (1992–2011) observational database to perform comparisons of hydrographic properties and reanalysis output for the same time period. Four case studies based on current meter data and the AABW volume transport estimates previously reported in the literature were also evaluated. The opening and maintenance of an oceanic polynya in the Weddell Sea sector is observed after 2004 in the reanalysis product. Moreover, intense deep water production due to deep convection occurs, which leads to a scenario in which the Weddell Sea is flooded with AABW. For this reason, our analyses focused on the period that was identified as more reliable (1992–2004). The main Southern Ocean oceanographic features, as well as the characteristic shape of the regional potential temperature–salinity (θ–S) diagrams, are coincident with observations. However, the reanalysis output produces surface waters that are generally denser than observations due to the reproduction of waters that are generally saltier than expected, which probably resulted from the strong seasonality of sea ice concentrations. Bottom waters are warmer and less dense, while intermediate waters are statistically closest to the observations. The differences in bottom water properties are partially due to the inability of the reanalysis to properly reproduce the formation and export of dense waters from the shelf and the consequent absence of the densest AABW variety for most of the analyzed period. Despite differences in the absolute values, the upper AABW limit (γ n ≥ 28.27 kg m−3 ) and AABW occupied area estimates are coincident with the observations in the World Ocean Circulation Experiment (WOCE) repeat sections SR2 and SR4. Moreover, the AABW volume export and current velocity variability are correlated with the observed time ... Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Weddell Sea RI FURG (Repositório da Universidade Federal do Rio Grande) Antarctic Southern Ocean Weddell Weddell Sea Ocean Science 10 6 923 946 |
institution |
Open Polar |
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RI FURG (Repositório da Universidade Federal do Rio Grande) |
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ftunivfurg |
language |
English |
description |
We analyzed the ability of the Estimating the Circulation and Climate of the Ocean – Phase II (ECCO2) reanalysis to represent the hydrographic properties and variability of Antarctic Bottom Water (AABW) in the Southern Ocean. We used a 20-year (1992–2011) observational database to perform comparisons of hydrographic properties and reanalysis output for the same time period. Four case studies based on current meter data and the AABW volume transport estimates previously reported in the literature were also evaluated. The opening and maintenance of an oceanic polynya in the Weddell Sea sector is observed after 2004 in the reanalysis product. Moreover, intense deep water production due to deep convection occurs, which leads to a scenario in which the Weddell Sea is flooded with AABW. For this reason, our analyses focused on the period that was identified as more reliable (1992–2004). The main Southern Ocean oceanographic features, as well as the characteristic shape of the regional potential temperature–salinity (θ–S) diagrams, are coincident with observations. However, the reanalysis output produces surface waters that are generally denser than observations due to the reproduction of waters that are generally saltier than expected, which probably resulted from the strong seasonality of sea ice concentrations. Bottom waters are warmer and less dense, while intermediate waters are statistically closest to the observations. The differences in bottom water properties are partially due to the inability of the reanalysis to properly reproduce the formation and export of dense waters from the shelf and the consequent absence of the densest AABW variety for most of the analyzed period. Despite differences in the absolute values, the upper AABW limit (γ n ≥ 28.27 kg m−3 ) and AABW occupied area estimates are coincident with the observations in the World Ocean Circulation Experiment (WOCE) repeat sections SR2 and SR4. Moreover, the AABW volume export and current velocity variability are correlated with the observed time ... |
format |
Article in Journal/Newspaper |
author |
Azeneu, Marina do Valle Chagas Duarte, Rodrigo Kerr Pereira Mata, Mauricio Magalhães |
spellingShingle |
Azeneu, Marina do Valle Chagas Duarte, Rodrigo Kerr Pereira Mata, Mauricio Magalhães Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis |
author_facet |
Azeneu, Marina do Valle Chagas Duarte, Rodrigo Kerr Pereira Mata, Mauricio Magalhães |
author_sort |
Azeneu, Marina do Valle Chagas |
title |
Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis |
title_short |
Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis |
title_full |
Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis |
title_fullStr |
Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis |
title_full_unstemmed |
Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis |
title_sort |
assessment of the representation of antarctic bottom water properties in the ecco2 reanalysis |
publishDate |
2014 |
url |
http://repositorio.furg.br/handle/1/5864 https://doi.org/10.5194/os-10-923-2014 |
geographic |
Antarctic Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
op_relation |
AZENEU, Marina do Valle Chagas; DUARTE, Rodrigo Kerr Pereira; MATA, Mauricio Magalhães. Assessment of the representation of antarctic bottom water properties in the ECCO2 reanalysis. Ocean Science, v. 10, n.6, p.923–946, 2014. Disponível em: <http://www.ocean-sci.net/10/923/2014/os-10-923-2014.html>. Acesso em 22 Jan 2016. 2005-7172 1738-5261 http://repositorio.furg.br/handle/1/5864 doi:10.5194/os-10-923-2014 |
op_rights |
open access |
op_doi |
https://doi.org/10.5194/os-10-923-2014 |
container_title |
Ocean Science |
container_volume |
10 |
container_issue |
6 |
container_start_page |
923 |
op_container_end_page |
946 |
_version_ |
1782327926671278080 |