Synoptic patterns of South Atlantic Convergence Zone episodes associated with heavy rainfall events in the city of Rio de Janeiro, Brazil
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| Format: | Artículo científico |
| Sprache: | en |
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Universidad Nacional Autónoma de México
2022
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| _version_ | 1876477010113462272 |
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| author | Gustavo Carlos Juan Escobar |
| author_facet | Gustavo Carlos Juan Escobar |
| contents | Synoptic patterns of South Atlantic Convergence Zone episodes associated with heavy rainfall events in the city of Rio de Janeiro, Brazil Gustavo Carlos Juan Escobar Ana Clara de Almeida Marques Claudine Pereira Dereczynski Biología SACZ composite analysis synoptic climatology principal pattern sequence analysis The present study provides a synoptic characterization of South Atlantic Convergence Zone (SACZ) episodes that caused heavy rainfall events (HRE) in the city of Rio de Janeiro (CRJ) between 2006 and 2016. A total of 77 SACZ episodes were identified in the CRJ (SCRJ), which represented 81% of the total SACZ events in Brazil. At least one day of HRE during the SACZ period (SHRE) was found in 37 SCRJ episodes, representing almost half (48%) of the SACZ events in the CRJ. In 68.6% of these cases, the heavy rainfall occurred on the first two days of the SHRE period. The mean synoptic pattern of SHRE showed a cold front in the Atlantic Ocean connected with a low-pressure system located near the coast of Rio de Janeiro state (RJ). The 850 hPa specific humidity showed a dipole pattern with positive anomalies in southeastern Brazil and negative anomalies in southern Brazil since the day before the occurrence of SHRE. An anomalous upper-level ridge in southeastern Brazil was relevant to intensifying the heavy rainfall in the CRJ. The synoptic classification showed four main surface synoptic patterns associated with SHRE. The two most frequent patterns were associated with a cold front close to the coast of RJ, and the other two were related to the presence of an anticyclone with blocking characteristics and to the presence of a weak extratropical cyclone near the coast of RJ. 2022 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56581609006 https://www.redalyc.org/journal/565/56581609006/ https://www.redalyc.org/journal/565/56581609006/html/ https://www.redalyc.org/journal/565/56581609006/56581609006.epub https://www.redalyc.org/journal/565/56581609006/movil 10.20937/ATM.52942 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.2 Vol.35 |
| format | Artículo científico |
| id | redalyc_56581609006 |
| institution | Redalyc |
| language | en |
| publishDate | 2022 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Synoptic patterns of South Atlantic Convergence Zone episodes associated with heavy rainfall events in the city of Rio de Janeiro, Brazil Gustavo Carlos Juan Escobar Biología SACZ composite analysis synoptic climatology principal pattern sequence analysis Synoptic patterns of South Atlantic Convergence Zone episodes associated with heavy rainfall events in the city of Rio de Janeiro, Brazil Gustavo Carlos Juan Escobar Ana Clara de Almeida Marques Claudine Pereira Dereczynski Biología SACZ composite analysis synoptic climatology principal pattern sequence analysis The present study provides a synoptic characterization of South Atlantic Convergence Zone (SACZ) episodes that caused heavy rainfall events (HRE) in the city of Rio de Janeiro (CRJ) between 2006 and 2016. A total of 77 SACZ episodes were identified in the CRJ (SCRJ), which represented 81% of the total SACZ events in Brazil. At least one day of HRE during the SACZ period (SHRE) was found in 37 SCRJ episodes, representing almost half (48%) of the SACZ events in the CRJ. In 68.6% of these cases, the heavy rainfall occurred on the first two days of the SHRE period. The mean synoptic pattern of SHRE showed a cold front in the Atlantic Ocean connected with a low-pressure system located near the coast of Rio de Janeiro state (RJ). The 850 hPa specific humidity showed a dipole pattern with positive anomalies in southeastern Brazil and negative anomalies in southern Brazil since the day before the occurrence of SHRE. An anomalous upper-level ridge in southeastern Brazil was relevant to intensifying the heavy rainfall in the CRJ. The synoptic classification showed four main surface synoptic patterns associated with SHRE. The two most frequent patterns were associated with a cold front close to the coast of RJ, and the other two were related to the presence of an anticyclone with blocking characteristics and to the presence of a weak extratropical cyclone near the coast of RJ. 2022 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56581609006 https://www.redalyc.org/journal/565/56581609006/ https://www.redalyc.org/journal/565/56581609006/html/ https://www.redalyc.org/journal/565/56581609006/56581609006.epub https://www.redalyc.org/journal/565/56581609006/movil 10.20937/ATM.52942 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.2 Vol.35 |
| title | Synoptic patterns of South Atlantic Convergence Zone episodes associated with heavy rainfall events in the city of Rio de Janeiro, Brazil |
| topic | Biología SACZ composite analysis synoptic climatology principal pattern sequence analysis |
| url | https://www.redalyc.org/articulo.oa?id=56581609006 https://www.redalyc.org/journal/565/56581609006/ https://www.redalyc.org/journal/565/56581609006/html/ https://www.redalyc.org/journal/565/56581609006/56581609006.epub https://www.redalyc.org/journal/565/56581609006/movil |