DOI: 10.1007/s00382-016-3344-8
Scopus记录号: 2-s2.0-84987615720
论文题名: The role of synoptic and intraseasonal anomalies on the life cycle of rainfall extremes over South America: non-summer conditions
作者: Hirata F.E. ; Grimm A.M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 2017-01-02 起始页码: 313
结束页码: 326
语种: 英语
英文摘要: Previous study showed that the interaction of synoptic disturbances with intraseasonal anomalies is important for heavy rainfall in the South Atlantic Convergence Zone and the La Plata basin during the austral summer. Here, we conduct similar analysis to study the evolution of rainfall extremes during austral spring (SON), fall (MAM) and winter (JJA). A relatively homogeneous region over southeastern South America, whose limits change little from season to season, is heavily affected by extreme precipitation events, as indicated by the value of the 95th percentile of daily rainfall, higher during the spring season (16.94 mm day−1) and lower in winter (13.79 mm day−1). From 1979 to 2013, extreme rainfall events are more frequent in spring (131 events) and less frequent in fall (112 events). Similar to summertime extreme events, synoptic-scale waves continue to be the main drivers of extreme precipitation over the region. The interaction between these waves and intraseasonal anomalies during the development of rainfall extremes over southeastern South America is observed especially during neutral ENSO and La Niña conditions. Warm ENSO phases tend to favor more frequent extremes in all three seasons and extreme events during El Niños are associated with synoptic waves, with no significant interaction with intraseasonal anomalies. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53161
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Physics, Universidade Federal do Paraná, Curitiba, Brazil
Recommended Citation:
Hirata F.E.,Grimm A.M.. The role of synoptic and intraseasonal anomalies on the life cycle of rainfall extremes over South America: non-summer conditions[J]. Climate Dynamics,2017-01-01,49(2017-01-02)