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Centennial-scale solar forcing of the South American Monsoon System recorded in stalagmites.

Abstract：

:The South American Monsoon System (SAMS) is generally considered to be highly sensitive to Northern Hemisphere (NH) temperature variations on multi-centennial timescales. The direct influence of solar forcing on moisture convergence in global monsoon systems on the other hand, while well explored in modeling studies, has hitherto not been documented in proxy data from the SAMS region. Hence little is known about the sensitivity of the SAMS to solar forcing over the past millennium and how it might compete or constructively interfere with NH temperature variations that occurred primarily in response to volcanic forcing. Here we present a new annually-resolved oxygen isotope record from a 1500-year long stalagmite recording past changes in precipitation in the hitherto unsampled core region of the SAMS. This record details how solar variability consistently modulated the strength of the SAMS on centennial time scales during the past 1500 years. Solar forcing, besides the previously recognized influence from NH temperature changes and associated Intertropical Convergence Zone (ITCZ) shifts, appears as a major driver affecting SAMS intensity at centennial time scales.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Novello VF,Vuille M,Cruz FW,Stríkis NM,de Paula MS,Edwards RL,Cheng H,Karmann I,Jaqueto PF,Trindade RI,Hartmann GA,Moquet JS

doi

10.1038/srep24762

subject

Has Abstract

pub_date

2016-04-21 00:00:00

pages

24762

issn

2045-2322

pii

srep24762

journal_volume

6

pub_type

杂志文章

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