气候变化领域集成服务门户(CCPortal): Recent intensification of extreme precipitation events in the La Plata Basin in Southern South America (1981

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DOI	10.1016/j.atmosres.2020.105299
	Recent intensification of extreme precipitation events in the La Plata Basin in Southern South America (1981–2018)
	Cerón W.L.; Kayano M.T.; Andreoli R.V.; Avila-Diaz A.; Ayes I.; Freitas E.D.; Martins J.A.; Souza R.A.F.
发表日期	2021
ISSN	0169-8095
卷号	249
英文摘要	Changes and trends in ten extreme daily rainfall indices in the La Plata Basin (LPB) during the 1981–2018 period were analyzed. These indices were evaluated for three regions in the LPB, namely the northern, central, and southern LPB (N-LPB, C-LPB, and S-LPB, respectively). A decrease in the maximum rainfall over five consecutive days (RX5day) and an increase in the consecutive dry days (CDD) were observed in N-LPB, mainly during the austral winter. An increase in the total wet-day precipitation was found in S-LPB, particularly during September–November (SON), and during December–February (DJF). The number of heavy precipitation days (R10mm) and CDD indices in S-LPB during SON showed a breaking point in 1999 and were followed by an increase in R10mm after 1999. Therefore, we discussed the large-scale climatic features that could be related to the breaking point in the extreme precipitation indices found in the S-LPB during SON, through correlation analysis. Our results indicate that R10mm shows significant positive correlations with the sea surface temperature (SST) in the Southwestern Subtropical Atlantic Region, mainly between 32°S–22°S and 50 W–34°W. The SST anomaly index in this oceanic region for SON during 1981–2018 displayed a significant upward change in 1999. Furthermore, the correlation map between this index and the vertically integrated moisture flux (VIMF) and its divergence, shows negative correlations in the S-LPB, which means a decrease of the moisture divergence in this region. This implies an increase (decrease) of R10mm, and a decrease (increase) of CDD in the S-LPB after (before) 1999. This relationship results from an anticyclone in the Southwestern Atlantic extending into the LPB up to 60°W, which causes an increase in the northwesterly moisture flux over central and southern parts of the basin, enhancing the moisture convergence over S-LPB. These insights have not been discussed previously, and might be relevant for future modeling studies and monitoring tasks. © 2020 Elsevier B.V.
英文关键词	CHIRPS; Climate extreme indices; Extreme daily rainfall; La Plata Basin; Precipitation trends and changes
语种	英语
scopus关键词	Lanthanum; Moisture; Rain; Surface waters; Extreme precipitation; Extreme precipitation events; Moisture convergence; Negative correlation; Positive correlations; Sea surface temperature (SST); Southern south america; Southwestern Atlantic; Oceanography; climate conditions; diurnal variation; extreme event; future prospect; precipitation intensity; seasonal variation; trend analysis; La Plata Basin
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141659
作者单位	Department of Geography, Faculty of Humanities, Universidad del Valle, Calle 13 #100-00, PO Box: 25360, Cali, Colombia; Post-Graduate Climate and Environmental Studies Program, Instituto Nacional de Pesquisa da Amazonia, Universidade do Estado do Amazonas, Ave. André Araújo, 2936, Manaus, CEP 69060-001, Brazil; Centro de Previsão de Tempo e Estudos Climáticos, Instituto Nacional de Pesquisas Espaciais, Av. dos Astronautas, 1758, São José dos Campos, SP 12227-010, Brazil; Escola Superior de Tecnologia, Universidade do Estado do Amazonas, Av. Darcy Vargas, 1200, Parque 10 de Novembro, Manaus, AM 69050-020, Brazil; Department of Agricultural Engineering, Federal University of Viçosa, Viçosa, 36570-900, Brazil; Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Rua do Matão, 1226, São Paulo, SP 05508-090, Brazil; Federal University of Technology, Paraná, Av. dos Pioneiros 3131, Londrina, PR, Brazil
推荐引用方式 GB/T 7714	Cerón W.L.,Kayano M.T.,Andreoli R.V.,等. Recent intensification of extreme precipitation events in the La Plata Basin in Southern South America (1981–2018)[J],2021,249.
APA	Cerón W.L..,Kayano M.T..,Andreoli R.V..,Avila-Diaz A..,Ayes I..,...&Souza R.A.F..(2021).Recent intensification of extreme precipitation events in the La Plata Basin in Southern South America (1981–2018).Atmospheric Research,249.
MLA	Cerón W.L.,et al."Recent intensification of extreme precipitation events in the La Plata Basin in Southern South America (1981–2018)".Atmospheric Research 249(2021).