کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6426476 | 1634114 | 2014 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Holocene moisture change revealed by the Rb/Sr ratio of aeolian deposits in the southeastern Mu Us Desert, China
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Holocene moisture change revealed by the Rb/Sr ratio of aeolian deposits in the southeastern Mu Us Desert, China Holocene moisture change revealed by the Rb/Sr ratio of aeolian deposits in the southeastern Mu Us Desert, China](/preview/png/6426476.png)
چکیده انگلیسی
Systematic analysis of the Rb and Sr contents and Rb/Sr ratios in different lithological units of the palaeosol-aeolian sequence in the southeastern Mu Us Desert revealed that the Rb/Sr ratio is an accurate proxy for past East Asian summer monsoonal strength and moisture change. A lower Sr content and a higher Rb/Sr ratio, chemical index of alteration (CIA), and clay and organic matter (OM) content in the palaeosol are coincident with stronger Asian summer monsoons and increased precipitation, whereas a higher Sr content and a lower Rb/Sr ratio, CIA, and clay and OM content correspond to a dry climate with weaker summer monsoonal strength. Based on these results, the history of Holocene moisture changes was reconstructed as follows: the moisture was lower before 7.5Â ka and approached an optimal climate between 7.5Â ka and 4.6Â ka, afterwards, the climate tended to be dry. Additionally, six millennial-scale dry events were recorded at the times of â¼7.5Â ka, 7.0-6.8Â ka, 6.6-5.7Â ka, 4.6-4.1Â ka, 3.7-3.5Â ka, and 3.3-2.5Â ka, which were very accordant with cold phases evidenced by ice cores and deep-sea deposits in the low and high latitudes of the Northern Hemisphere. These were also coincident with weaker Asian summer monsoonal intervals revealed by stalagmites within the dating uncertainties, probably implying a prominent synchronism of Holocene millennial-scale climate changes in the Mu Us Desert and global climate changes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aeolian Research - Volume 13, June 2014, Pages 109-119
Journal: Aeolian Research - Volume 13, June 2014, Pages 109-119
نویسندگان
Bing Liu, Heling Jin, Liangying Sun, Zhong Sun, Qinghe Niu, Shengbo Xie, Guanhua Li,