DOI: 10.1007/s00382-017-3932-2
Scopus记录号: 2-s2.0-85030179058
论文题名: Characterizing the exceptional 2014 drought event in São Paulo by drought period length
作者: Zou Y. ; Macau E.E.N. ; Sampaio G. ; Ramos A.M.T. ; Kurths J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期: 2018-01-02 起始页码: 433
结束页码: 442
语种: 英语
英文关键词: Drought period length
; Precipitation
; Sea level pressure
; Sea surface temperature
; South Atlantic ocean
; Southeast Brazil
Scopus关键词: climate conditions
; climate variation
; drought
; extreme event
; high pressure system
; precipitation (climatology)
; sea level pressure
; sea surface temperature
; summer
; Amazonia
; Atlantic Ocean
; Atlantic Ocean (South)
; Brazil
; Sao Paulo [Brazil]
; Sao Paulo [Sao Paulo (STT)]
英文摘要: In the last decade, the southeast region of Brazil has been suffering severe water shortages. Here, we propose to compute the expected drought period length to characterize the drought events in the region of São Paulo. We report the unique properties of the exceptional drought event during the austral summer 2014 by showing the differences and similarities to the very dry season in 2001 and the mild dry seasons in 2006 and 2015. Furthermore, we investigate the correlations of the abnormal precipitation deficit with the ocean and atmospheric patterns. In comparison to other drought events, we validate the hypothetical mechanism that underlies the exceptional drought 2014: (1) The existence of an anomalous high pressure center in the area acts as a blocking mechanism that prevents moisture transport from the Amazon and passage of cold front systems from south Brazil. This blocking high has been observed in all dry seasons considered, with much larger magnitude in 2014. (2) The much faster increasing trend of the anomalous sea surface temperature acts as a strong feedback which intensified the extreme climate conditions. The unprecedented increasing trend of the SST in 2014 was not observed in other climate variables representing a high pressure center. Therefore, we conclude that the exceptional drought 2014 was enhanced by the feedback mechanism of anomalous warming of SST in the South Atlantic Oceans, which was resulted from the anomalous high pressure. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109231
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Physics, East China Normal University, Shanghai, 200062, China; Instituto Nacional de Pesquisas Espaciais, São José dos Campos, São Paulo, Brazil; Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista, São Paulo, Brazil; Potsdam Institute for Climate Impact Research, 60 12 03, Potsdam, 14412, Germany; Department of Physics, Humboldt University Berlin, Newtonstraße 15, Berlin, 12489, Germany; Institute for Complex Systems and Mathematical Biology, University of Aberdeen, Aberdeen, AB243UE, United Kingdom
Recommended Citation:
Zou Y.,Macau E.E.N.,Sampaio G.,et al. Characterizing the exceptional 2014 drought event in São Paulo by drought period length[J]. Climate Dynamics,2018-01-01,51(2018-01-02)