globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-015-2533-1
Scopus记录号: 2-s2.0-84947491620
论文题名:
A correlated shortening of the North and South American monsoon seasons in the past few decades
作者: Arias P.A.; Fu R.; Vera C.; Rojas M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期:2017-11-12
起始页码: 3183
结束页码: 3203
语种: 英语
英文关键词: Cross-equatorial flow ; Global warming ; North American monsoon ; North Atlantic subtropical high ; South American monsoon ; Southern Amazon wet season
英文摘要: Our observational analysis shows that the wet seasons of the American monsoon systems have shortened since 1978 due to correlated earlier retreats of the North American monsoon (NAM) and late onsets of the southern Amazon wet season, an important part of the South American monsoon (SAM). These changes are related to the combination of the global sea surface temperature (SST) warming mode, the El Niño-Southern Oscillation (ENSO), the Atlantic Multidecadal Oscillation (AMO), the westward shift of the North Atlantic subtropical high (NASH), and the enhancement of Pacific South American and Pacific North American wave train patterns, which induces variations of the regional circulation at interannual and decadal scales. The joint contributions from these forcing factors are associated with a stronger and more equatorward regional Hadley cell, which enhances convergence towards the equator, strengthening and possibly delaying the retreat of the tropical part of the NAM. This in turn accelerates the demise of the northern NAM and delays the reversal of the cross-equatorial flow over South America, reducing moisture transport to the SAM and delaying its onset. In addition, the thermodynamic response to warming appears to cause local drier land conditions over both regions, reinforcing the observed changes in these monsoons. Although previous studies have identified the isolated influence of the regional Hadley cell, ENSO, AMO, global SST warming, and NASH on the NAM, the correlated changes between NAM and SAM through variations of the cross-equatorial flow had not been established before. © 2015, Springer-Verlag Berlin Heidelberg.
资助项目: CONICYT, Comisión Nacional de Investigación Científica y Tecnológica ; FONDECYT, Comisión Nacional de Investigación Científica y Tecnológica ; NSF, Comisión Nacional de Investigación Científica y Tecnológica ; CONICYT, Comisión Nacional de Investigación Científica y Tecnológica
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53927
Appears in Collections:过去全球变化的重建

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作者单位: Grupo de Ingeniería y Gestión Ambiental (GIGA), Escuela Ambiental, Universidad de Antioquia, Calle 67 # 53-108, Bloque 20, Oficina 441, A. A. 1226, Medellín, Colombia; Departamento de Geofísica, Universidad de Chile, Santiago, Chile; Department of Geological Sciences, The University of Texas at Austin, Austin, TX, United States; Centro de Investigaciones del Mar y la Atmósfera, CONICET-UBA, DCAO/FCEN, UMI, IFAECI/CNRS, Buenos Aires, Argentina

Recommended Citation:
Arias P.A.,Fu R.,Vera C.,et al. A correlated shortening of the North and South American monsoon seasons in the past few decades[J]. Climate Dynamics,2015-01-01,45(2017-11-12)
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