Influence of intraseasonal variability on precipitation in northern South America during the winter season
ABSTRACT Intraseasonal precipitation, wind, and vertically integrated moisture flux variability were assessed from June to August between 1998 and 2009. To that end, we used daily precipitation data from the Tropical Rainfall Measuring Mission ( TRMM ) and ERA ‐Interim reanalysis. The composites of...
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crwiley:10.1002/joc.4845 2024-06-02T08:11:35+00:00 Influence of intraseasonal variability on precipitation in northern South America during the winter season de Oliveira, Cristiano P. Ambrizzi, Tercio Aimola, Luis Conselho Nacional de Desenvolvimento Científico e Tecnológico 2016 http://dx.doi.org/10.1002/joc.4845 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.4845 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.4845 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 37, issue 4, page 2177-2186 ISSN 0899-8418 1097-0088 journal-article 2016 crwiley https://doi.org/10.1002/joc.4845 2024-05-03T10:42:57Z ABSTRACT Intraseasonal precipitation, wind, and vertically integrated moisture flux variability were assessed from June to August between 1998 and 2009. To that end, we used daily precipitation data from the Tropical Rainfall Measuring Mission ( TRMM ) and ERA ‐Interim reanalysis. The composites of precipitation anomalies showed that during the intraseasonal enhancement of convective activity over the area assessed, increased precipitation occurs over the northern coast of South America; the opposite is true during the decrease in intraseasonal convective activity. The convective activity over the region of maximum precipitation variance is intraseasonally enhanced during 210 days, whereas the decrease occurs during 194 days. During the days on which the convective activity over the region of maximum precipitation variance was enhanced (decreased) by the Madden–Julian oscillation, the frequency of African easterly waves (AEWs) cases was greater (lower). The most significant average characteristics observed during this period were the displacement of positive precipitation anomalies toward the north and the intensification of the flux toward the tropical North Atlantic Ocean. This pattern disfavours precipitation over the northern coast of South America. On the other hand, during the dry period of Madden–Julian oscillation, there was a decrease in AEWs cases which, although there was negative precipitation anomalies over the northern coast of South America, there were positive anomalies over northwest South America. Therefore, the increase (decrease) in convective activity over the region of maximum precipitation variance favours (disfavours) the frequency of AEWs over this region and, consequently, the precipitation over the northern coast of South America decreases (increases) during the dry season (June to August). Article in Journal/Newspaper North Atlantic Wiley Online Library International Journal of Climatology 37 4 2177 2186 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT Intraseasonal precipitation, wind, and vertically integrated moisture flux variability were assessed from June to August between 1998 and 2009. To that end, we used daily precipitation data from the Tropical Rainfall Measuring Mission ( TRMM ) and ERA ‐Interim reanalysis. The composites of precipitation anomalies showed that during the intraseasonal enhancement of convective activity over the area assessed, increased precipitation occurs over the northern coast of South America; the opposite is true during the decrease in intraseasonal convective activity. The convective activity over the region of maximum precipitation variance is intraseasonally enhanced during 210 days, whereas the decrease occurs during 194 days. During the days on which the convective activity over the region of maximum precipitation variance was enhanced (decreased) by the Madden–Julian oscillation, the frequency of African easterly waves (AEWs) cases was greater (lower). The most significant average characteristics observed during this period were the displacement of positive precipitation anomalies toward the north and the intensification of the flux toward the tropical North Atlantic Ocean. This pattern disfavours precipitation over the northern coast of South America. On the other hand, during the dry period of Madden–Julian oscillation, there was a decrease in AEWs cases which, although there was negative precipitation anomalies over the northern coast of South America, there were positive anomalies over northwest South America. Therefore, the increase (decrease) in convective activity over the region of maximum precipitation variance favours (disfavours) the frequency of AEWs over this region and, consequently, the precipitation over the northern coast of South America decreases (increases) during the dry season (June to August). |
author2 |
Conselho Nacional de Desenvolvimento Científico e Tecnológico |
format |
Article in Journal/Newspaper |
author |
de Oliveira, Cristiano P. Ambrizzi, Tercio Aimola, Luis |
spellingShingle |
de Oliveira, Cristiano P. Ambrizzi, Tercio Aimola, Luis Influence of intraseasonal variability on precipitation in northern South America during the winter season |
author_facet |
de Oliveira, Cristiano P. Ambrizzi, Tercio Aimola, Luis |
author_sort |
de Oliveira, Cristiano P. |
title |
Influence of intraseasonal variability on precipitation in northern South America during the winter season |
title_short |
Influence of intraseasonal variability on precipitation in northern South America during the winter season |
title_full |
Influence of intraseasonal variability on precipitation in northern South America during the winter season |
title_fullStr |
Influence of intraseasonal variability on precipitation in northern South America during the winter season |
title_full_unstemmed |
Influence of intraseasonal variability on precipitation in northern South America during the winter season |
title_sort |
influence of intraseasonal variability on precipitation in northern south america during the winter season |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1002/joc.4845 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.4845 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.4845 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
International Journal of Climatology volume 37, issue 4, page 2177-2186 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.4845 |
container_title |
International Journal of Climatology |
container_volume |
37 |
container_issue |
4 |
container_start_page |
2177 |
op_container_end_page |
2186 |
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1800757777175412736 |