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Mineralogical evidence of reduced East Asian summer monsoon rainfall on the Chinese loess plateau during the early Pleistocene interglacials

Meng, Xianqiang and Liu, Lianwen and Wang, Xingchen T. and Balsam, William and Chen, Jun and Ji, Junfeng (2018) Mineralogical evidence of reduced East Asian summer monsoon rainfall on the Chinese loess plateau during the early Pleistocene interglacials. Earth and Planetary Science Letters, 486 . pp. 61-69. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20180130-140046897

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Abstract

The East Asian summer monsoon (EASM) is an important component of the global climate system. A better understanding of EASM rainfall variability in the past can help constrain climate models and better predict the response of EASM to ongoing global warming. The warm early Pleistocene, a potential analog of future climate, is an important period to study EASM dynamics. However, existing monsoon proxies for reconstruction of EASM rainfall during the early Pleistocene fail to disentangle monsoon rainfall changes from temperature variations, complicating the comparison of these monsoon records with climate models. Here, we present three 2.6 million-year-long EASM rainfall records from the Chinese Loess Plateau (CLP) based on carbonate dissolution, a novel proxy for rainfall intensity. These records show that the interglacial rainfall on the CLP was lower during the early Pleistocene and then gradually increased with global cooling during the middle and late Pleistocene. These results are contrary to previous suggestions that a warmer climate leads to higher monsoon rainfall on tectonic timescales. We propose that the lower interglacial EASM rainfall during the early Pleistocene was caused by reduced sea surface temperature gradients across the equatorial Pacific, providing a testable hypothesis for climate models.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.epsl.2017.12.048DOIArticle
https://www.sciencedirect.com/science/article/pii/S0012821X18300049PublisherArticle
Additional Information:© 2018 Elsevier B.V. Received 30 April 2017, Revised 29 December 2017, Accepted 29 December 2017, Available online 28 January 2018. We thank X. Wang and R. Hu for helpful discussions and three anonymous reviewers for their insightful comments. We also thank F. Li for assistance in the laboratory. This study was funded by the National Science Foundation of China (41230526 and 41273111) and supported by Program B for Outstanding Ph.D. candidate of Nanjing University.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China41230526
National Natural Science Foundation of China41273111
Nanjing UniversityUNSPECIFIED
Subject Keywords:monsoon rainfall; loess; carbonate; ENSO; Chinese Loess Plateau
Record Number:CaltechAUTHORS:20180130-140046897
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180130-140046897
Official Citation:Xianqiang Meng, Lianwen Liu, Xingchen T. Wang, William Balsam, Jun Chen, Junfeng Ji, Mineralogical evidence of reduced East Asian summer monsoon rainfall on the Chinese loess plateau during the early Pleistocene interglacials, Earth and Planetary Science Letters, Volume 486, 15 March 2018, Pages 61-69, ISSN 0012-821X, https://doi.org/10.1016/j.epsl.2017.12.048. (https://www.sciencedirect.com/science/article/pii/S0012821X18300049)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84586
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:31 Jan 2018 00:10
Last Modified:31 Jan 2018 00:10

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