2019/2020 drought impacts on South America and atmospheric and oceanic influences
The 2019/2020 drought in South America caused many impacts on several sectors, as agriculture, water resources and environment, which are reported here. Besides, there is a discussion about anomalies in the atmosphere and ocean during the analyzed period. In a regional scale, there was a reduction o...
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ftconicet:oai:ri.conicet.gov.ar:11336/167349 2023-10-09T21:54:12+02:00 2019/2020 drought impacts on South America and atmospheric and oceanic influences Gomes, Mariah Souza Fonseca de Albuquerque Cavalcanti, Iracema Muller, Gabriela Viviana application/pdf http://hdl.handle.net/11336/167349 eng eng Elsevier info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S2212094721000918 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.wace.2021.100404 http://hdl.handle.net/11336/167349 Gomes, Mariah Souza; Fonseca de Albuquerque Cavalcanti, Iracema; Muller, Gabriela Viviana; 2019/2020 drought impacts on South America and atmospheric and oceanic influences; Elsevier; Weather and Climate Extremes; 34; 12-2021; 1-13 2212-0947 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ ATMOSPHERE AND OCEAN FEATURES DROUGHT IMPACTS PRECIPITATION ANOMALIES SOUTH AMERICA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.wace.2021.100404 2023-09-24T19:39:51Z The 2019/2020 drought in South America caused many impacts on several sectors, as agriculture, water resources and environment, which are reported here. Besides, there is a discussion about anomalies in the atmosphere and ocean during the analyzed period. In a regional scale, there was a reduction of humidity flux over the continent, and in a large scale, the occurrence of different processes could have contributed to the dry conditions. There was a persistent pattern of west-east convection anomalies in the tropical Pacific that could be related to the steady conditions observed over South America and southeast South Atlantic from September 2019 to March 2020. The extreme positive phase of the Indian Ocean Dipole during 2019 austral spring was another event that could have influenced temperature and precipitation in South America through a wavetrain from the Indian Ocean to the South American continent. The Sudden Stratospheric Warming that occurred in September 2019 induced the negative phase of the Southern Annular Mode in December, which generated subsidence over the subtropics and affected the precipitation over South America. In addition, from September 2019 to March 2020, the heating observed in the stratosphere propagated to the troposphere over South America. Ocean indices from 1982 to 2020 are analyzed in the context of dry conditions in the continent and it was observed the relations with AMO, PDO, IOD and El Niño 3.4. From September 2019 to March 2020, there were positive SST anomalies in all oceans, mainly in the North Atlantic Ocean, which could have contributed also to subsidence over South America through a meridional circulation, as seen in other cases. At the end of the studied period, the development of La Niña extended the situation of reduced precipitation in Southern Brazil. Fil: Gomes, Mariah Souza. Centro de Previsao de Tempo e Estudos Climáticos. Instituto Nacional de Pesquisas Espaciais; Brasil Fil: Fonseca de Albuquerque Cavalcanti, Iracema. Centro de Previsao de Tempo e Estudos ... Article in Journal/Newspaper North Atlantic CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Austral Pacific Indian Weather and Climate Extremes 34 100404 |
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Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
ATMOSPHERE AND OCEAN FEATURES DROUGHT IMPACTS PRECIPITATION ANOMALIES SOUTH AMERICA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
ATMOSPHERE AND OCEAN FEATURES DROUGHT IMPACTS PRECIPITATION ANOMALIES SOUTH AMERICA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Gomes, Mariah Souza Fonseca de Albuquerque Cavalcanti, Iracema Muller, Gabriela Viviana 2019/2020 drought impacts on South America and atmospheric and oceanic influences |
topic_facet |
ATMOSPHERE AND OCEAN FEATURES DROUGHT IMPACTS PRECIPITATION ANOMALIES SOUTH AMERICA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
The 2019/2020 drought in South America caused many impacts on several sectors, as agriculture, water resources and environment, which are reported here. Besides, there is a discussion about anomalies in the atmosphere and ocean during the analyzed period. In a regional scale, there was a reduction of humidity flux over the continent, and in a large scale, the occurrence of different processes could have contributed to the dry conditions. There was a persistent pattern of west-east convection anomalies in the tropical Pacific that could be related to the steady conditions observed over South America and southeast South Atlantic from September 2019 to March 2020. The extreme positive phase of the Indian Ocean Dipole during 2019 austral spring was another event that could have influenced temperature and precipitation in South America through a wavetrain from the Indian Ocean to the South American continent. The Sudden Stratospheric Warming that occurred in September 2019 induced the negative phase of the Southern Annular Mode in December, which generated subsidence over the subtropics and affected the precipitation over South America. In addition, from September 2019 to March 2020, the heating observed in the stratosphere propagated to the troposphere over South America. Ocean indices from 1982 to 2020 are analyzed in the context of dry conditions in the continent and it was observed the relations with AMO, PDO, IOD and El Niño 3.4. From September 2019 to March 2020, there were positive SST anomalies in all oceans, mainly in the North Atlantic Ocean, which could have contributed also to subsidence over South America through a meridional circulation, as seen in other cases. At the end of the studied period, the development of La Niña extended the situation of reduced precipitation in Southern Brazil. Fil: Gomes, Mariah Souza. Centro de Previsao de Tempo e Estudos Climáticos. Instituto Nacional de Pesquisas Espaciais; Brasil Fil: Fonseca de Albuquerque Cavalcanti, Iracema. Centro de Previsao de Tempo e Estudos ... |
format |
Article in Journal/Newspaper |
author |
Gomes, Mariah Souza Fonseca de Albuquerque Cavalcanti, Iracema Muller, Gabriela Viviana |
author_facet |
Gomes, Mariah Souza Fonseca de Albuquerque Cavalcanti, Iracema Muller, Gabriela Viviana |
author_sort |
Gomes, Mariah Souza |
title |
2019/2020 drought impacts on South America and atmospheric and oceanic influences |
title_short |
2019/2020 drought impacts on South America and atmospheric and oceanic influences |
title_full |
2019/2020 drought impacts on South America and atmospheric and oceanic influences |
title_fullStr |
2019/2020 drought impacts on South America and atmospheric and oceanic influences |
title_full_unstemmed |
2019/2020 drought impacts on South America and atmospheric and oceanic influences |
title_sort |
2019/2020 drought impacts on south america and atmospheric and oceanic influences |
publisher |
Elsevier |
url |
http://hdl.handle.net/11336/167349 |
geographic |
Austral Pacific Indian |
geographic_facet |
Austral Pacific Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S2212094721000918 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.wace.2021.100404 http://hdl.handle.net/11336/167349 Gomes, Mariah Souza; Fonseca de Albuquerque Cavalcanti, Iracema; Muller, Gabriela Viviana; 2019/2020 drought impacts on South America and atmospheric and oceanic influences; Elsevier; Weather and Climate Extremes; 34; 12-2021; 1-13 2212-0947 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.wace.2021.100404 |
container_title |
Weather and Climate Extremes |
container_volume |
34 |
container_start_page |
100404 |
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1779317701724864512 |