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DOI | 10.1002/joc.5847 |
A climatology of quasi-linear convective systems and associated synoptic-scale environments in southern Brazil | |
Ribeiro, Bruno Z.1; Seluchi, Marcelo E.2 | |
2019-02-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
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ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2019 |
卷号 | 39期号:2页码:857-877 |
文章类型 | Article |
语种 | 英语 |
国家 | Brazil |
英文摘要 | This study presents a 9-year climatology and composite analysis of quasi-linear convective systems (QLCSs) in southern Brazil (SB). QLCSs are identified using radar imagery and defined as a 100-km long, 40-dBZ convective line that lasts for at least 1 hr. QLCS cases associated with at least three severe wind reports are classified as severe. Composites of the synoptic-scale environments and severe convective weather parameters are constructed for severe and non-severe cases of three synoptic patterns found as the most recurrent in QLCS cases. QLCSs are more frequent and more likely to be severe during spring, while very few cases occur during winter. Most cases occur during late night and morning, corroborating previous research of mesoscale convective systems in this area, but the percentages of severe cases are higher in late afternoon and early night. Faster QLCSs, particularly those with velocities greater than 50 km/hr, have higher probability of being severe in comparison to slower systems. The three synoptic patterns more often related to QLCS occurrence in SB are characterized by a mid-level trough upstream of SB (type 1), a mid-level trough west of the Andes (type 2) and predominance of zonal flow over SB (type 3). In general, there is a low-pressure system over northwestern Argentina extending a trough to SB, where low-level moisture flux convergence and warm advection occur. In severe cases, the sea-level pressure is lower in northwestern Argentina and there is greater low-level northwesterly flow over SB. The type 1 is the most frequent pattern when QLCSs are observed in SB and is also the type with higher percentage of severe cases. Convective available potential energy (CAPE) and downdraft CAPE are good discriminators between severe and non-severe cases in type 1 and 2 environments, while the 1,000-500-hPa bulk wind difference is a better predictor in type 3 cases. |
英文关键词 | quasi-linear convective systems severe thunderstorms southern Brazil synoptic climatology |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000459665000019 |
WOS关键词 | LOW-LEVEL MESOVORTICES ; SQUALL LINES ; SEVERE THUNDERSTORM ; BOW ECHOES ; SUPERCELL ; FORECAST ; AMERICA ; EVOLUTION ; DYNAMICS ; DERECHOS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/37142 |
专题 | 气候变化 |
作者单位 | 1.INPE, CPTEC, Rodovia Presidente Dutra,Km 39, BR-12630000 Cachoeira Paulista, SP, Brazil; 2.Ctr Nacl Monitoramento & Alertas Desastres Nat CE, Sao Jose Dos Campos, Brazil |
推荐引用方式 GB/T 7714 | Ribeiro, Bruno Z.,Seluchi, Marcelo E.. A climatology of quasi-linear convective systems and associated synoptic-scale environments in southern Brazil[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019,39(2):857-877. |
APA | Ribeiro, Bruno Z.,&Seluchi, Marcelo E..(2019).A climatology of quasi-linear convective systems and associated synoptic-scale environments in southern Brazil.INTERNATIONAL JOURNAL OF CLIMATOLOGY,39(2),857-877. |
MLA | Ribeiro, Bruno Z.,et al."A climatology of quasi-linear convective systems and associated synoptic-scale environments in southern Brazil".INTERNATIONAL JOURNAL OF CLIMATOLOGY 39.2(2019):857-877. |
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