DOI: 10.1002/2015GL066314
论文题名: Two summers of São Paulo drought: Origins in the western tropical Pacific
作者: Seth A. ; Fernandes K. ; Camargo S.J.
刊名: Geophysical Research Letters
ISSN: 0094-8312
EISSN: 1944-8043
出版年: 2015
卷: 42, 期: 24 起始页码: 10816
结束页码: 10823
语种: 英语
英文关键词: drought
; southeast Brazil
Scopus关键词: Atmospheric temperature
; Oceanography
; Surface waters
; Convective heating
; Geopotential height anomalies
; Large-scale dynamics
; Low pressure systems
; Precipitation deficits
; Southeast Brazil
; Southwest Atlantic
; Tropical Pacific ocean
; Drought
; anticyclone
; atmospheric convection
; drought
; geopotential
; low pressure system
; precipitation (climatology)
; regional climate
; sea surface temperature
; spatiotemporal analysis
; summer
; teleconnection
; temperature anomaly
; Atlantic Ocean
; Atlantic Ocean (South)
; Brazil
; California
; Pacific Ocean
; Pacific Ocean (South)
; Pacific Ocean (West)
; Sao Paulo [Brazil]
; United States
英文摘要: Two years of drought in Southeast Brazil have led to water shortages in São Paulo, the country's most populous city. We examine the observed drought during austral summers of 2013/2014 and 2014/2015 and the related large-scale dynamics. The 2013-2014 precipitation deficits were more concentrated in the state of São Paulo, while in 2014-2015 moderate deficits were seen throughout the region. We find that a persistent warm sea surface temperature (SST) anomaly in the western tropical Pacific Ocean was an important driver of drought via atmospheric teleconnection in the two December-February seasons. The warm SST and associated convective heating initiated a wave train across the South Pacific. The resulting anticyclonic geopotential height anomaly over the southwest Atlantic expanded the westward margin of the South Atlantic high and prevented low-pressure systems from entering southeast Brazil from midlatitudes. This mechanism suggests a hemispheric symmetry to that proposed for the recent California drought. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955213220&doi=10.1002%2f2015GL066314&partnerID=40&md5=b1e9acd21c19b36cf6dfc3ed4443e391
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7928
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geography, University of Connecticut, Storrs, CT, United States
Recommended Citation:
Seth A.,Fernandes K.,Camargo S.J.. Two summers of São Paulo drought: Origins in the western tropical Pacific[J]. Geophysical Research Letters,2015-01-01,42(24).