摘要
Widespread aeolian deposits on the Tibetan Plateau(TP)have provided valuable palaeoclimatic information.However,the primary factors(e.g.,climate factors,human activity,and vegetation cover)controlling aeolian deposition remain elusive.In this paper,we use a dataset that comprises new and published ages of Holocene aeolian sand and loess in the middle reaches of the Yarlung Zangbo River to identify the primary controlling factors and palaeoclimatic implications of aeolian deposition.Several intervals of enhanced aeolian accumulation centered at 8.5-7.8,6.4-5.8,4.5-4.0,3.1-1.8,and 0.9 ka are identified,generally consistent with regional low rainfall events and weak Indian summer monsoon(ISM).This suggests that regional wetness,dominated by the ISM,may play a key role in modulating dust emissions and aeolian deposition on centennial timescales.Our results show that on centennial-to millennial-scales,ISM activity can be reconstructed by non-continuous aeolian deposits in the monsoon dominated TP.
Widespread aeolian deposits on the Tibetan Plateau (TP) have provided valuable palaeoclimatic information. However, the primary factors (e.g., climate factors, human activity, and vegetation cover) controlling aeolian deposition remain elusive. In this paper, we use a dataset that comprises new and published ages of Holocene aeolian sand and loess in the middle reaches of the Yarlung Zangbo River to identify the primary controlling factors and palaeoclimatic implications of aeolian deposition. Several intervals of enhanced aeolian accumulation centered at 8.5–7.8, 6.4–5.8, 4.5–4.0, 3.1–1.8, and 0.9 ka are identified, generally consistent with regional low rainfall events and weak Indian summer monsoon (ISM). This suggests that regional wetness, dominated by the ISM, may play a key role in modulating dust emissions and aeolian deposition on centennial timescales. Our results show that on centennial- to millennial-scales, ISM activity can be reconstructed by non-continuous aeolian deposits in the monsoon dominated TP.
作者
李拓宇
张继峰
伍永秋
杜世松
莫多闻
廖奕楠
陈智童
刘建宝
李庆
LI Tuoyu;ZHANG Jifeng;WU Yongqiu;DU Shisong;MO Duowen;LIAO Yinan;CHEN Zhitong;LIU Jianbao;LI Qing(Capital Normal University,Beijing 100048,China;Key Laboratory of Alpine Ecology(LAE),Institute of Tibetan Plateau Research,CAS,Beijing 100101,China;MOE Engineering Center of Desertification and Blown-sand Control,Beijing Normal University,Beijing 100875,China;Laboratory for Earth Surface Processes,Ministry of Education,College of Urban and Environmental Sciences,Peking University,Beijing 100871,China;Institute of Geographical Sciences,Hebei Engineering Research Center of Geographic Information Application,Hebei Academy of Sciences,Shijiazhuang 050011,China)
基金
National Natural Science Foundation of China,No.41601191,No.41871070,No.41877460
National Basic Research Program of China,No.2013CB956001
Special Researcher Project of Henan Province。
