Possible impact of the Atlantic Multidecadal Oscillation on the South American summer monsoon

被引：76
作者：
Chiessi, Cristiano M. [1 ,2 ]
Mulitza, Stefan [1 ]
Paetzold, Juergen [1 ]
Wefer, Gerold [1 ]
Marengo, Jose A. [2 ]
机构：
[1] Univ Bremen, MARUM, Ctr Marine Environm Sci, D-28359 Bremen, Germany
[2] Natl Inst Space Res, Ctr Earth Syst Sci, BR-12227010 Sao Jose Dos Campos, SP, Brazil
来源：
GEOPHYSICAL RESEARCH LETTERS | 2009年 / 36卷
关键词：
VARIABILITY; CLIMATE; BRAZIL; CIRCULATION; PRECIPITATION; RAINFALL; RECORDS;
D O I：
10.1029/2009GL039914
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
The South American summer monsoon (SASM) is the main source of precipitation for the most densely populated and agriculturally productive regions of tropical and subtropical South America. Here we investigate the impact of the Atlantic Multidecadal Oscillation (AMO) on the SASM using similar to 4500 yr long proxy records of the discharge variability of the La Plata River Drainage Basin (PRDB), subtropical South America. We measured the stable oxygen composition of planktic foraminifera (related to the extension of the PRDB plume), and Ti intensity in bulk sediment (related to the source of the terrigenous sediments) from a marine sediment core. Spectral and wavelet analyses of our records indicate an oscillation with period of similar to 64 yr. We conclude that the observed oscillation reflects variability in the SASM activity associated to the AMO. Sea surface temperature and atmospheric circulation anomalies triggered by the AMO would control the variability in SASM activity. Citation: Chiessi, C. M., S. Mulitza, J. Patzold, G. Wefer, and J. A. Marengo (2009), Possible impact of the Atlantic Multidecadal Oscillation on the South American summer monsoon, Geophys. Res. Lett., 36, L21707, doi: 10.1029/2009GL039914.
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页数：5
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