Assessment of 20th‐century reanalysis circulation patterns associated with El Niño–Southern Oscillation impacts on the tropical Atlantic and northeastern Brazil rainy season
Abstract The present study investigates how the 20th‐century atmospheric reanalyses (ERA‐20C and NOAA‐20CR) reproduce the known impacts of El Niño–Southern Oscillation (ENSO) on the tropical North Atlantic (TNA) atmospheric circulation from the boreal winter to spring and the consequences on northea...
Published in: | International Journal of Climatology |
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Language: | English |
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Online Access: | http://dx.doi.org/10.1002/joc.6750 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.6750 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6750 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6750 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6750 |
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crwiley:10.1002/joc.6750 2024-06-02T08:11:43+00:00 Assessment of 20th‐century reanalysis circulation patterns associated with El Niño–Southern Oscillation impacts on the tropical Atlantic and northeastern Brazil rainy season Pinheiro, Enzo da Rocha, Rosmeri Porfirio Drumond, Anita Conselho Nacional de Desenvolvimento Científico e Tecnológico Coordenação de Aperfeiçoamento de Pessoal de Nível Superior 2020 http://dx.doi.org/10.1002/joc.6750 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.6750 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6750 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6750 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6750 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 41, issue 7, page 3824-3840 ISSN 0899-8418 1097-0088 journal-article 2020 crwiley https://doi.org/10.1002/joc.6750 2024-05-03T11:03:56Z Abstract The present study investigates how the 20th‐century atmospheric reanalyses (ERA‐20C and NOAA‐20CR) reproduce the known impacts of El Niño–Southern Oscillation (ENSO) on the tropical North Atlantic (TNA) atmospheric circulation from the boreal winter to spring and the consequences on northeastern Brazil (NEB) precipitation during its rainy season (boreal spring). For the period 1979–2010, comparisons of atmospheric patterns associated with ENSO events are made through the use of anomaly composites of variables provided by ERA‐20C, NOAA‐20CR and satellite‐era reanalyses (ERA‐Interim and NCEP‐Reanalysis 2). We also evaluate the ability of the reanalyses to reproduce the interannual variability of precipitation during the boreal spring over Ceará state (located in NEB) by statistically comparing them with Funceme rain‐gauge and Global Precipitation Climatology Center (GPCC) datasets. As the main result, both 20th‐century reanalyses capture the major features in the tropical Pacific representing the climatic system during ENSO years as well as its impacts on the tropical Atlantic, in agreement with previous studies. However, some differences are noted, such as (a) NOAA‐20CR differs from the other reanalyses since it indicates stronger (weaker) near‐surface (upper levels) wind anomalies over the central‐western equatorial Pacific in both El Niño and La Niña composites; (b) over the tropical Atlantic, all reanalyses indicate the existence of an omega anomalies dipole between 10°N and 10°S for both ENSO phases although a weaker signal is seen in NOAA‐20CR; (c) NOAA‐20CR underestimates the intensity of the precipitation anomalies over the NEB during El Niño and La Niña years, and this is associated with the weaker vertical velocity anomalies. These results indicate that ERA‐20C is the most appropriate 20th‐century reanalysis to study the long‐term interannual variability in the tropical Atlantic associated with ENSO and its impacts on precipitation in northeastern Brazil. Article in Journal/Newspaper North Atlantic Wiley Online Library Pacific International Journal of Climatology 41 7 3824 3840 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The present study investigates how the 20th‐century atmospheric reanalyses (ERA‐20C and NOAA‐20CR) reproduce the known impacts of El Niño–Southern Oscillation (ENSO) on the tropical North Atlantic (TNA) atmospheric circulation from the boreal winter to spring and the consequences on northeastern Brazil (NEB) precipitation during its rainy season (boreal spring). For the period 1979–2010, comparisons of atmospheric patterns associated with ENSO events are made through the use of anomaly composites of variables provided by ERA‐20C, NOAA‐20CR and satellite‐era reanalyses (ERA‐Interim and NCEP‐Reanalysis 2). We also evaluate the ability of the reanalyses to reproduce the interannual variability of precipitation during the boreal spring over Ceará state (located in NEB) by statistically comparing them with Funceme rain‐gauge and Global Precipitation Climatology Center (GPCC) datasets. As the main result, both 20th‐century reanalyses capture the major features in the tropical Pacific representing the climatic system during ENSO years as well as its impacts on the tropical Atlantic, in agreement with previous studies. However, some differences are noted, such as (a) NOAA‐20CR differs from the other reanalyses since it indicates stronger (weaker) near‐surface (upper levels) wind anomalies over the central‐western equatorial Pacific in both El Niño and La Niña composites; (b) over the tropical Atlantic, all reanalyses indicate the existence of an omega anomalies dipole between 10°N and 10°S for both ENSO phases although a weaker signal is seen in NOAA‐20CR; (c) NOAA‐20CR underestimates the intensity of the precipitation anomalies over the NEB during El Niño and La Niña years, and this is associated with the weaker vertical velocity anomalies. These results indicate that ERA‐20C is the most appropriate 20th‐century reanalysis to study the long‐term interannual variability in the tropical Atlantic associated with ENSO and its impacts on precipitation in northeastern Brazil. |
author2 |
Conselho Nacional de Desenvolvimento Científico e Tecnológico Coordenação de Aperfeiçoamento de Pessoal de Nível Superior |
format |
Article in Journal/Newspaper |
author |
Pinheiro, Enzo da Rocha, Rosmeri Porfirio Drumond, Anita |
spellingShingle |
Pinheiro, Enzo da Rocha, Rosmeri Porfirio Drumond, Anita Assessment of 20th‐century reanalysis circulation patterns associated with El Niño–Southern Oscillation impacts on the tropical Atlantic and northeastern Brazil rainy season |
author_facet |
Pinheiro, Enzo da Rocha, Rosmeri Porfirio Drumond, Anita |
author_sort |
Pinheiro, Enzo |
title |
Assessment of 20th‐century reanalysis circulation patterns associated with El Niño–Southern Oscillation impacts on the tropical Atlantic and northeastern Brazil rainy season |
title_short |
Assessment of 20th‐century reanalysis circulation patterns associated with El Niño–Southern Oscillation impacts on the tropical Atlantic and northeastern Brazil rainy season |
title_full |
Assessment of 20th‐century reanalysis circulation patterns associated with El Niño–Southern Oscillation impacts on the tropical Atlantic and northeastern Brazil rainy season |
title_fullStr |
Assessment of 20th‐century reanalysis circulation patterns associated with El Niño–Southern Oscillation impacts on the tropical Atlantic and northeastern Brazil rainy season |
title_full_unstemmed |
Assessment of 20th‐century reanalysis circulation patterns associated with El Niño–Southern Oscillation impacts on the tropical Atlantic and northeastern Brazil rainy season |
title_sort |
assessment of 20th‐century reanalysis circulation patterns associated with el niño–southern oscillation impacts on the tropical atlantic and northeastern brazil rainy season |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/joc.6750 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.6750 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6750 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6750 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6750 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
International Journal of Climatology volume 41, issue 7, page 3824-3840 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.6750 |
container_title |
International Journal of Climatology |
container_volume |
41 |
container_issue |
7 |
container_start_page |
3824 |
op_container_end_page |
3840 |
_version_ |
1800757943250976768 |