DOI: 10.1007/s00382-014-2088-6
Scopus记录号: 2-s2.0-84897577365
论文题名: Role of the global oceans and land-atmosphere interaction on summertime interdecadal variability over northern Argentina
作者: Barreiro M. ; Díaz N. ; Renom M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-07-08 起始页码: 1733
结束页码: 1753
语种: 英语
英文关键词: Interdecadal
; Land-atmosphere interaction
; Northern Argentina
; Predictability
; Rainfall variability
英文摘要: This study uses experiments with an atmospheric general circulation model (AGCM) to address the role of the oceans and the effect of land-atmosphere coupling on the predictability of summertime rainfall over northern Argentina focusing on interdecadal time scales during 1901-2006. Ensembles of experiments where the AGCM is forced with historical sea surface temperature (SST) in the global, Pacific and tropical-North Atlantic domains are used. The role of land-atmosphere interaction is assessed comparing the output of simulations with active and climatological soil moisture. A maximum covariance analysis between precipitation and SST reveals the impact of the Pacific Decadal Oscillation, the Atlantic Multidecadal Oscillation and the equatorial-tropical South Atlantic on rainfall over northern Argentina. Model simulations further show that while the dominant influence comes from the Pacific basin, the Atlantic influence can explain a large transition from dry to wet decades over northern Argentina during the beginning of the 1970s. Analysis of anomalies before and after the transition reveals an upper level anticyclonic circulation off the Patagonian coast with barotropic structure. This circulation enhances the moisture transport and convergence in northern Argentina and, together with enhanced evaporation, increased the rainfall after 1970. The SST pattern is dominated by cold conditions in the equatorial Atlantic and warm eastern Pacific and South Atlantic. We also found that land-atmosphere interaction leads to a representation of the long term rainfall evolution over northern Argentina that is closer to the observed one. Moreover, it leads to a smaller dispersion among ensemble members, thus resulting in a larger signal-to-noise ratio. © 2014 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54643
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Unidad de Ciencias de la Atmósfera, Instituto de Fisica, Universidad de la República, Igua 4225, 11400 Montevideo, Uruguay
Recommended Citation:
Barreiro M.,Díaz N.,Renom M.. Role of the global oceans and land-atmosphere interaction on summertime interdecadal variability over northern Argentina[J]. Climate Dynamics,2014-01-01,42(2017-07-08)