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

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

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3621707c&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 21, CiteID L21707

Mathematics

Logic

5

Biogeosciences: Paleoclimatology And Paleoceanography (3344, 4900), Paleoceanography: Continental Climate Records, Paleoceanography: Thermohaline, Oceanography: Biological And Chemical: Geochemistry

Scientific paper

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 ˜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 ˜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.

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