Holocene Dune Mobility and Forcing Mechanisms at the Northern Margin of the East Asian Monsoon

作     者：HE Zhong ZHOU Jie YANG Linhai HE Hongming 

作者机构：Institute of Soil and Water Conservation Northwest A&F University Institute of Soil and Water Conservation Chinese Academy of Sciences & Ministry of Water Resource Key Laboratory of Desert and Desertification Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2013年第87卷第4期

页      面：1168-1178页

核心收录：

学科分类：070905[理学-第四纪地质学] 0709[理学-地质学] 07[理学] 09[农学] 0903[农学-农业资源与环境] 

基　　金：financially supported by the National Science Foundation of China(Grant No.41102102) "Strategic Priority Research Program"of the Chinese Academy of Sciences(Grant No.XDB03020300) the Key Research Program of the Chinese Academy of Sciences(Grant No.KZZD-EW-04-03) 

主　　题：Holocene dune mobility luminescence dating East Asian Monsoon forcing mechanisms 

摘      要：Dune fields at the northern margin of the East Asian monsoon （EAM）, are mosaics of mobile and vegetation-stabilized aeolian dunes. These sand dunes are highly sensitive to environmental change, thus the distribution and the timing of their development may provide important clues to past environmental dynamics. Due to the strong wind erosion and dune migration, long and continuous stratigraphic records are seldom preserved. Synthesizing a large body of events, ultimately producing a relatively complete and high-resolution record, may be a proper method to investigate the dune development history and climate change. In this study, we synthesized a large body of luminescence ages for aeolian deposits from the Mu Us, Otindag, Horqin dune fields at the northern margin of the EAM. The results show that these dune fields, as a whole experienced a most extensive mobility during the early Holocene, followed by a widespread shift toward limited mobility and soil development in the mid-Holocene, and widespread reactivation occurred during late Holocene. The dune developments are directly linked to the effective moisture change controlled by the EAM changes, which respond to the low latitude summer insolation variation. The increased subsidence at the margin contrary to the core EAM, the delay from the feedback of the soil-vegetation-air coupled system, the increased evaporation due to the high temperature all play partial role in the lag of the margin EAM effective moisture change to the low latitude summer insolation. The asynchronous end of the wetter mid-Holocene mainly responds to the southeastwardly shift of the precipitation belt, while the regional sensitivity, response speed and internal feedback also contributed. The correspondence between dune records and North Atlantic drift-ice records of the rapid climate changes implies a close relationship between North Atlantic climate and the frequent dune activity at the northern margin of EAM.