Assessing the Moisture Transports Associated With Nocturnal Low-Level Jets in Continental South America
Given the crucial role of low-level circulation in convective events, this study presents a climatological characterization of the moisture sources and sinks associated with the occurrence of nocturnal low-level jets (NLLJs) in South America. Six selected NLLJ cores are identified according to the j...
Published in: | Frontiers in Environmental Science |
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2021
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Online Access: | https://doi.org/10.3389/fenvs.2021.657764 https://doaj.org/article/241e0d8421a84255a90ef0f3cb222162 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:241e0d8421a84255a90ef0f3cb222162 2023-05-15T17:37:08+02:00 Assessing the Moisture Transports Associated With Nocturnal Low-Level Jets in Continental South America Dejanira Ferreira Braz Tércio Ambrizzi Rosmeri Porfírio da Rocha Iago Algarra Raquel Nieto Luis Gimeno 2021-04-01 https://doi.org/10.3389/fenvs.2021.657764 https://doaj.org/article/241e0d8421a84255a90ef0f3cb222162 en eng Frontiers Media S.A. 2296-665X doi:10.3389/fenvs.2021.657764 https://doaj.org/article/241e0d8421a84255a90ef0f3cb222162 undefined Frontiers in Environmental Science, Vol 9 (2021) nocturnal low-level jet South America moisture transport precipitation Lagrangian model geo socio Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.3389/fenvs.2021.657764 2023-01-22T19:30:52Z Given the crucial role of low-level circulation in convective events, this study presents a climatological characterization of the moisture sources and sinks associated with the occurrence of nocturnal low-level jets (NLLJs) in South America. Six selected NLLJ cores are identified according to the jet index that considers a vertical wind speed shear of the lower troposphere at 00:00 local time (LT). The Lagrangian FLEXible PARTicle (FLEXPART) model was used to provide the outputs for tracking atmospheric air masses to determine the moisture sources and sinks for the NLLJ cores (Argentina, Venezuela, and the regions of Brazil: south—Brazil-S, southeast—Brazil-SE, north—Brazil-N, and northeast—Brazil-NE). The analysis is based on 37 years (1980–2016) of the ERA-Interim reanalysis. We found that the NLLJ index is stronger in the warm periods of a year (austral spring and summer) for the six selected regions. The NLLJ frequency is also higher in the warm months of the year, except in Brazil-NE where it is very frequent in all months. In Brazil-NE, the NLLJ also persists for 8 or more days, while the other NLLJs frequently persist for 1–2 days. The NLLJs occupy a broad low-level layer (from 1000 to 700 hPa) and exhibit a mean speed between 7 and 12 ms–1, which peaks mostly at 900 hPa. The moisture transport for each NLLJ shows that in addition to the intense local moisture sources, the NLLJs in Argentina and Brazil-S receive moisture from the tropical-subtropical South Atlantic Ocean and the Amazon basin, while the tropical-subtropical South Atlantic Ocean is the main moisture source for the NLLJ in Brazil-SE. Both moisture sources and sinks are stronger in the austral summer and fall. The NLLJ in Brazil receives moisture from the tropical South Atlantic (TSA) Ocean, which has weak seasonality. The moisture sources for the NLLJs in Brazil-N and Venezuela come from the tropical North Atlantic (TNA) Ocean in the austral summer and fall, while the TSA Ocean appears as an additional moisture source in the austral winter. ... Article in Journal/Newspaper North Atlantic South Atlantic Ocean Unknown Argentina Austral Frontiers in Environmental Science 9 |
institution |
Open Polar |
collection |
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fttriple |
language |
English |
topic |
nocturnal low-level jet South America moisture transport precipitation Lagrangian model geo socio |
spellingShingle |
nocturnal low-level jet South America moisture transport precipitation Lagrangian model geo socio Dejanira Ferreira Braz Tércio Ambrizzi Rosmeri Porfírio da Rocha Iago Algarra Raquel Nieto Luis Gimeno Assessing the Moisture Transports Associated With Nocturnal Low-Level Jets in Continental South America |
topic_facet |
nocturnal low-level jet South America moisture transport precipitation Lagrangian model geo socio |
description |
Given the crucial role of low-level circulation in convective events, this study presents a climatological characterization of the moisture sources and sinks associated with the occurrence of nocturnal low-level jets (NLLJs) in South America. Six selected NLLJ cores are identified according to the jet index that considers a vertical wind speed shear of the lower troposphere at 00:00 local time (LT). The Lagrangian FLEXible PARTicle (FLEXPART) model was used to provide the outputs for tracking atmospheric air masses to determine the moisture sources and sinks for the NLLJ cores (Argentina, Venezuela, and the regions of Brazil: south—Brazil-S, southeast—Brazil-SE, north—Brazil-N, and northeast—Brazil-NE). The analysis is based on 37 years (1980–2016) of the ERA-Interim reanalysis. We found that the NLLJ index is stronger in the warm periods of a year (austral spring and summer) for the six selected regions. The NLLJ frequency is also higher in the warm months of the year, except in Brazil-NE where it is very frequent in all months. In Brazil-NE, the NLLJ also persists for 8 or more days, while the other NLLJs frequently persist for 1–2 days. The NLLJs occupy a broad low-level layer (from 1000 to 700 hPa) and exhibit a mean speed between 7 and 12 ms–1, which peaks mostly at 900 hPa. The moisture transport for each NLLJ shows that in addition to the intense local moisture sources, the NLLJs in Argentina and Brazil-S receive moisture from the tropical-subtropical South Atlantic Ocean and the Amazon basin, while the tropical-subtropical South Atlantic Ocean is the main moisture source for the NLLJ in Brazil-SE. Both moisture sources and sinks are stronger in the austral summer and fall. The NLLJ in Brazil receives moisture from the tropical South Atlantic (TSA) Ocean, which has weak seasonality. The moisture sources for the NLLJs in Brazil-N and Venezuela come from the tropical North Atlantic (TNA) Ocean in the austral summer and fall, while the TSA Ocean appears as an additional moisture source in the austral winter. ... |
format |
Article in Journal/Newspaper |
author |
Dejanira Ferreira Braz Tércio Ambrizzi Rosmeri Porfírio da Rocha Iago Algarra Raquel Nieto Luis Gimeno |
author_facet |
Dejanira Ferreira Braz Tércio Ambrizzi Rosmeri Porfírio da Rocha Iago Algarra Raquel Nieto Luis Gimeno |
author_sort |
Dejanira Ferreira Braz |
title |
Assessing the Moisture Transports Associated With Nocturnal Low-Level Jets in Continental South America |
title_short |
Assessing the Moisture Transports Associated With Nocturnal Low-Level Jets in Continental South America |
title_full |
Assessing the Moisture Transports Associated With Nocturnal Low-Level Jets in Continental South America |
title_fullStr |
Assessing the Moisture Transports Associated With Nocturnal Low-Level Jets in Continental South America |
title_full_unstemmed |
Assessing the Moisture Transports Associated With Nocturnal Low-Level Jets in Continental South America |
title_sort |
assessing the moisture transports associated with nocturnal low-level jets in continental south america |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/fenvs.2021.657764 https://doaj.org/article/241e0d8421a84255a90ef0f3cb222162 |
geographic |
Argentina Austral |
geographic_facet |
Argentina Austral |
genre |
North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic South Atlantic Ocean |
op_source |
Frontiers in Environmental Science, Vol 9 (2021) |
op_relation |
2296-665X doi:10.3389/fenvs.2021.657764 https://doaj.org/article/241e0d8421a84255a90ef0f3cb222162 |
op_rights |
undefined |
op_doi |
https://doi.org/10.3389/fenvs.2021.657764 |
container_title |
Frontiers in Environmental Science |
container_volume |
9 |
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1766136897326809088 |