Orbital Asian summer monsoon dynamics revealed using an isotope-enabled global climate model

Thibaut Caley (), Didier M. Roche and Hans Renssen
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Thibaut Caley: Earth and Climate Cluster, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam
Didier M. Roche: Earth and Climate Cluster, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam
Hans Renssen: Earth and Climate Cluster, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract The Asian summer monsoon dynamics at the orbital scale are a subject of considerable debate. The validity of Asian speleothem δ18O records as a proxy for summer monsoon intensity is questioned together with the ultimate forcing and timing of the monsoon. Here, using the results of a 150,000-year transient simulation including water isotopes, we demonstrate that Asian speleothem δ18O records are not a valid proxy for summer monsoon intensity only at the orbital timescale. Rather, our results show that these records reflect annual variations in hydrologic processes and circulation regime over a large part of the Indo-Asian region. Our results support the role of internal forcing, such as sea surface temperature in the equatorial Pacific, to modulate the timing of monsoon precipitation recorded in paleo-proxies inside the Asian region.

Date: 2014
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DOI: 10.1038/ncomms6371

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