Alteration in the large-scale circulation of south america triggered by the upper-tropospheric cyclonic vortices of Northeast Brazil
This study investigates how Upper-Tropospheric Cyclonic Vortices (UTCVs), which commonly form over Northeast Brazil (NEB), influence large-scale moisture transport across South America. UTCVs are the most important weather systems occurring in the pre-rainy season in Northeast Brazil and their under...
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| Published in | Dynamics of atmospheres and oceans Vol. 111; p. 101582 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.09.2025
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| Online Access | Get full text |
| ISSN | 0377-0265 |
| DOI | 10.1016/j.dynatmoce.2025.101582 |
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| Abstract | This study investigates how Upper-Tropospheric Cyclonic Vortices (UTCVs), which commonly form over Northeast Brazil (NEB), influence large-scale moisture transport across South America. UTCVs are the most important weather systems occurring in the pre-rainy season in Northeast Brazil and their understanding provides insights for improving short-term weather forecasting. Using 20 years of ERA-Interim reanalysis data (1999–2018) provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) and GOES satellite imagery, we analyze circulation changes associated with UTCVs and their impacts on rainfall in NEB. Results show that while moisture typically enters South America from the tropical Atlantic and moves westward into the Amazon, approximately 36 % of UTCVs disrupted this pattern by inducing a west-to-east moisture flow from the Amazon toward NEB. These events led to enhanced convergence over the vortex region and significantly increased precipitation. We present a conceptual model summarizing these mechanisms, providing new insights into the hydrometeorological role of UTCVs in regional rainfall variability and forecasting.
•Approximately 36% of UTCVs redirected moisture from the Amazon to Northeast Brazil, altering the typical flow.•Atlantic and Amazonian moisture interaction intensified convergence and rainfall over the UTCV region.•UTCVs affected continental circulation, showing features comparable to monsoon dynamics.•The study reveals how UTCVs modulate large-scale moisture transport across South America. |
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| AbstractList | This study investigates how Upper-Tropospheric Cyclonic Vortices (UTCVs), which commonly form over Northeast Brazil (NEB), influence large-scale moisture transport across South America. UTCVs are the most important weather systems occurring in the pre-rainy season in Northeast Brazil and their understanding provides insights for improving short-term weather forecasting. Using 20 years of ERA-Interim reanalysis data (1999–2018) provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) and GOES satellite imagery, we analyze circulation changes associated with UTCVs and their impacts on rainfall in NEB. Results show that while moisture typically enters South America from the tropical Atlantic and moves westward into the Amazon, approximately 36 % of UTCVs disrupted this pattern by inducing a west-to-east moisture flow from the Amazon toward NEB. These events led to enhanced convergence over the vortex region and significantly increased precipitation. We present a conceptual model summarizing these mechanisms, providing new insights into the hydrometeorological role of UTCVs in regional rainfall variability and forecasting.
•Approximately 36% of UTCVs redirected moisture from the Amazon to Northeast Brazil, altering the typical flow.•Atlantic and Amazonian moisture interaction intensified convergence and rainfall over the UTCV region.•UTCVs affected continental circulation, showing features comparable to monsoon dynamics.•The study reveals how UTCVs modulate large-scale moisture transport across South America. |
| ArticleNumber | 101582 |
| Author | Arraut, Josefina Moraes de Souza, Enio Pereira Lyra, Matheus José Arruda |
| Author_xml | – sequence: 1 givenname: Matheus José Arruda orcidid: 0000-0003-0890-762X surname: Lyra fullname: Lyra, Matheus José Arruda email: matheus.lyra@icat.ufal.br organization: Federal University of Alagoas, Brazil – sequence: 2 givenname: Josefina Moraes surname: Arraut fullname: Arraut, Josefina Moraes organization: Federal University of Campina Grande, Brazil – sequence: 3 givenname: Enio Pereira surname: de Souza fullname: de Souza, Enio Pereira organization: Federal University of Campina Grande, Brazil |
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| Cites_doi | 10.1175/JCLI-D-15-0065.1 10.1175/2009JAMC2030.1 10.1002/joc.6738 10.26848/rbgf.v16.3.p1104-1114 10.1002/qj.828 10.1038/s41598-018-38003-6 10.1175/JCLI-D-18-0700.1 10.3402/tellusa.v33i6.10775 10.1007/s00382-004-0461-6 10.1175/1520-0477(1997)078<1069:APICOW>2.0.CO;2 10.1007/BF01047006 10.1007/s00703-006-0207-6 10.1016/j.jsames.2022.103911 10.1175/1520-0493(1998)126<0725:APAFMF>2.0.CO;2 10.1029/96JD01936 10.1175/BAMS-87-1-63 10.1007/s00704-012-0637-7 10.1175/1520-0442(2004)017<2261:COTLJE>2.0.CO;2 10.1590/0102-7786355000003 10.1038/nature13636 10.1175/2011JCLI4189.1 10.1007/s00382-020-05223-4 10.1007/s00704-016-1840-8 10.1007/s00382-021-05873-y 10.1029/94GL01710 10.1029/TR032i005p00683 |
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| Keywords | Tropical region Moisture transport UTCV Amazon rainforest |
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| SubjectTerms | Amazon rainforest Moisture transport Tropical region UTCV |
| Title | Alteration in the large-scale circulation of south america triggered by the upper-tropospheric cyclonic vortices of Northeast Brazil |
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