DOI: 10.1175/JCLI-D-15-0803.1
Scopus记录号: 2-s2.0-84987984754
论文题名: Interdecadal variability of Southeastern South America rainfall and moisture sources during the austral summertime
作者: Martín-Gómez V. ; Hernández-Garcia E. ; Barreiro M. ; López C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 18 起始页码: 6751
结束页码: 6763
语种: 英语
Scopus关键词: Atmospheric temperature
; Climatology
; Moisture
; Rain
; Recycling
; Surface waters
; Synchronization
; Tropics
; Atmospheric circulation anomaly
; Climate variability
; Inter-decadal variability
; Interdecadal changes
; Rainfall variability
; Sea surface temperature anomalies
; Southeastern South America
; Variability
; Oceanography
英文摘要: Sea surface temperature (SST) anomalies over the tropical oceans are able to generate extratropical atmospheric circulation anomalies that can induce rainfall variability and changes in the sources of moisture. The work reported here evaluates the interdecadal changes in the moisture sources for southeastern South America (SESA) during austral summer, and it is divided into two complementary parts. In the first part the authors construct a climate network to detect synchronization periods among the tropical oceans and the precipitation over SESA. Afterward, taking into account these results, the authors select two periods with different degrees of synchronization to compare the spatial distribution of the SESA moisture sources. Results show that during the last century there were three synchronization periods among the tropical oceans and the precipitation over SESA (during the 1930s, 1970s, and 1990s) and suggest that the main moisture sources of SESA are the recycling over the region, the central-eastern shore of Brazil together with the surrounding Atlantic Ocean, and the southwestern South Atlantic surrounding the SESA domain. Comparison of SESA moisture sources for the 1980s (a period of nonsignificant synchronization) and the 1990s (a synchronized period) shows that the principal differences are in the intensity of the recycling and in the strength of the central-eastern shore of Brazil. Moreover, the authors find that a region centered at (20°S, 300°E) is a moisture source for SESA only during the 1990s. These differences can be associated with the development of a low-level anticyclonic (cyclonic) anomaly circulation over central-eastern Brazil that favors the transport of moisture from central Brazil (central-eastern shore of Brazil) toward SESA in the 1990s (1980s). © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50176
Appears in Collections: 气候变化事实与影响
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作者单位: Instituto de Física, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay; Instituto de Física Interdisciplinar y Sistemas Complejos, Campus Universitat de les Illes Balears, Palma de Mallorca, Spain
Recommended Citation:
Martín-Gómez V.,Hernández-Garcia E.,Barreiro M.,et al. Interdecadal variability of Southeastern South America rainfall and moisture sources during the austral summertime[J]. Journal of Climate,2016-01-01,29(18)