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DOI | 10.1002/joc.5248 |
Changes in the patterns of extreme rainfall events in southern Brazil | |
Fernandes, Lais G.; Rodrigues, Regina R. | |
2018-03-15 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
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ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2018 |
卷号 | 38期号:3页码:1337-1352 |
文章类型 | Article |
语种 | 英语 |
国家 | Brazil |
英文摘要 | In this study we have examined changes in frequency and intensity of extreme rainfall events for the state of Santa Catarina (SC) in southern Brazil during austral spring and summer. The results show that changes in El Nino-Southern Oscillation (ENSO) between 1979-1999 and 2000-2015 due to different phases of Interdecadal Pacific Oscillation have an impact on the teleconnection patterns from the Pacific to South America. As a consequence, precipitation over SC in the late period is less likely to be linked to ENSO. Moreover, there have been changes not only in the frequency and intensity of extreme events between the two periods but also in the mechanisms that cause the extremes affecting the spatial distribution of the extremes. In spring, the extreme events are less likely to occur during El Nino events and more frequent during La Nina and neutral years. The classical mechanism, of an enhanced South Atlantic Lower Level Jet (SALLJ) bringing moisture to SC, is no longer responsible for the extremes in the spring. The current main mechanism is associated with the presence of frontal systems during ENSO years and the presence of the South Atlantic Convergence Zone (SACZ) to the north combined with an anticyclonic system off the South American coast during neutral years. As a consequence the extreme events are currently more frequent at stations in the eastern side of SC. In summer during neutral years, SACZ events have become less frequent at the same time that atmospheric blocking events have become more frequent, explaining the decrease in extremes. On the other hand, SACZ events have become more frequent during La Nina years and so do the extremes in SC, with El Nino events playing a less important role. |
英文关键词 | ENSO Interdecadal Pacific Oscillation extreme rainfall events South America southern Brazil |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426729300017 |
WOS关键词 | SUMMER MONSOON RAINFALL ; EL-NINO ; SURFACE-TEMPERATURE ; INTERDECADAL VARIABILITY ; PRECIPITATION EVENTS ; ATLANTIC ; AMERICA ; CIRCULATION ; OSCILLATION ; STATIONARY |
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/36981 |
专题 | 气候变化 |
作者单位 | Univ Fed Santa Catarina, Dept Geosci, Campus Trindade,CP 476, Florianopolis, SC, Brazil |
推荐引用方式 GB/T 7714 | Fernandes, Lais G.,Rodrigues, Regina R.. Changes in the patterns of extreme rainfall events in southern Brazil[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2018,38(3):1337-1352. |
APA | Fernandes, Lais G.,&Rodrigues, Regina R..(2018).Changes in the patterns of extreme rainfall events in southern Brazil.INTERNATIONAL JOURNAL OF CLIMATOLOGY,38(3),1337-1352. |
MLA | Fernandes, Lais G.,et al."Changes in the patterns of extreme rainfall events in southern Brazil".INTERNATIONAL JOURNAL OF CLIMATOLOGY 38.3(2018):1337-1352. |
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