South American monsoon response to iceberg discharge in the North Atlantic

Author(s):Show less -

Strikis, Nicolas M. ^{[1, 2]} ; Cruz, Francisco W. ^[1] ; Barreto, Eline A. S. ^[1] ; Naughton, Filipa ^{[3, 4]} ; Vuille, Mathias ^[5] ; Cheng, Hai ^{[6, 7]} ; Voelker, Antje H. L. ^{[3, 4]} ; Zhang, Haiwei ^[6] ; Karmann, Ivo ^[1] ; Edwards, R. Lawrence ^[7] ; Auler, Augusto S. ^[8] ; Santos, Roberto Ventura ^[9] ; Sales, Hamilton Reis ^[10]

Affiliation

^[1] Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo - Brazil

^[2] Univ Fed Fluminense, Dept Geoquim, BR-24020141 Niteroi, RJ - Brazil

^[3] Inst Portugues Mar & Atmosfera, P-1495006 Lisbon - Portugal

^[4] Algarve Univ, Ctr Marine Sci, P-8005139 Faro - Portugal

^[5] SUNY Albany, Dept Atmospher & Environm Sci, Albany, NY 12222 - USA

^[6] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Shaanxi - Peoples R China

^[7] Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 - USA

^[8] Inst Carste, BR-30360260 Belo Horizonte, MG - Brazil

^[9] Univ Brasilia, Inst Geociencias, BR-70297400 Brasilia, DF - Brazil

^[10] Inst Fed Educ Ciencia & Tecnol Norte Minas Gerais, BR-39480000 Januaria - Brazil

• Document type: Journal article
• Source: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA; v. 115, n. 15, p. 3788-3793, APR 10 2018.
• Web of Science Citations: 9

Abstract

Heinrich Stadials significantly affected tropical precipitation through changes in the interhemispheric temperature gradient as a result of abrupt cooling in the North Atlantic. Here, we focus on changes in South American monsoon precipitation during Heinrich Stadials using a suite of speleothem records covering the last 85 ky B.P. from eastern South America. We document the response of South American monsoon precipitation to episodes of extensive iceberg discharge, which is distinct from the response to the cooling episodes that precede the main phase of ice-rafted detritus deposition. Our results demonstrate that iceberg discharge in the western subtropical North Atlantic led to an abrupt increase in monsoon precipitation over eastern South America. Our findings of an enhanced Southern Hemisphere monsoon, coeval with the iceberg discharge into the North Atlantic, are consistent with the observed abrupt increase in atmospheric methane concentrations during Heinrich Stadials. (AU)

• FAPESP's process: 16/00299-4 - Geochemistry of vadose percolation in karst systems: implications for paleoclimatic interpretations os speleothem records
• Grantee: Ivo Karmann
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/01187-4 - A calibration study in Central Brazil caves: implications for the paleoclimate inferences from speleothem records
• Grantee: Ivo Karmann
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/50260-6 - Structure and evolution of the Amazonian biota and its environment: an integrative approach
• Grantee: Lúcia Garcez Lohmann
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants