3 years ago

Sandy Loess Records of Precipitation Changes and Monsoon Migrations in the Hunshandake SandyLandsince the Last Glacial Maximum

Zhiyong Han, Xusheng Li, Yong Wang, Huayu Lu, Qianqian Yang, Shuangwen Yi, Cunjuan Lv, Yuwen Zhou, Zhiwei Xu, Mengyao Jiang

Abstract

The Hunshandake Sandy Land (Hunshandake) in central Inner Mongolia, China,is located within the fringe of the East Asian summer monsoon (EASM) domains. Precipitation records in Hunshandake are essential to studying the migrations of the EASM. This workreproduced the precipitation changes since the Last Glacial Maximum (LGM) by measuring the magnetic susceptibility and carbonate content through optically stimulated luminescence (OSL) dating of two sandy loess profiles within the sandy land to obtain a high resolution sedimentary chronological sequence. In addition, aeolian topsoilsamples were collected along the modern precipitation gradient and their magnetic susceptibility valueswere compared among the monsoon region, the monsoon marginal region, and the non‐monsoon region. The results demonstrate the following: (1) from 25 ka to 15 ka, precipitation was low in Hunshandake and exhibited no substantial variability or trend; from 15 ka to 6 ka, precipitation increased gradually and reached its maximum at approximately6 ka; after 6 ka, precipitation decreased again;(2) precipitation changes in Hunshandake since the LGM were mainly determined by the migration of the EASM; and(3) changes in the monsoon migrations in Hunshandake since the LGM are primarily drivenby the changes in global ice volume and subordinately by solar radiation.

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