Tropical South Atlantic influence on Northeastern Brazil precipitation and ITCZ displacement during the past 2300 years
2019
Recent paleoclimatic studies suggest that changes in the
tropicalrainbelt across the Atlantic Ocean during the past two millennia are linked to a latitudinal shift of the
Intertropical Convergence Zone(ITCZ) driven by the
Northern Hemisphere(NH) climate. However, little is known regarding other potential drivers that can affect
tropical Atlanticrainfall, mainly due to the scarcity of adequate and high-resolution records. In this study, we fill this gap by reconstructing precipitation changes in Northeastern Brazil during the last 2,300 years from a high-resolution lake record of hydrogen isotope compositions of plant waxes. We find that regional precipitation along the coastal area of South America was not solely governed by north-south displacements of the ITCZ due to changes in NH climate, but also by the contraction and expansion of the
tropicalrainbelt due to variations in sea surface temperature and southeast
trade windsin the
tropicalSouth Atlantic Basin.
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