气候变化领域集成服务门户(CCPortal): Moisture evolution in Central Asia since 26 ka: Insights from a Kyrgyz loess section; Western Tian Shan

CCPortal

DOI	10.1016/j.quascirev.2020.106604
	Moisture evolution in Central Asia since 26 ka: Insights from a Kyrgyz loess section; Western Tian Shan
	Li Y.; Song Y.; Orozbaev R.; Dong J.; Li X.; Zhou J.
发表日期	2020
ISSN	0277-3791
卷号	249
英文摘要	Central Asia (CA) is located in the hinterland of the Eurasian continent, and faces an extreme risk of continued aridification under the current global warming trend. To predict future climate change in CA, paleoclimate studies provide essential references. However, the mechanisms underlying climate changes in CA remain relatively poorly known. Here, we investigate moisture variations in CA, as recorded in a 6-m loess section in the Western Tian Shan, Kyrgyzstan, which has accumulated since ∼26 ka based on the radiometric AMS 14C dating. We reconstructed the evolution of the wind regime and moisture conditions in the Western Tian Shan with a modified grain size index (GSIm) and a new L∗ proxy (ΔL∗). While the frequency-dependent magnetic susceptibility (χfd), redness (a∗) and yellowness (b∗) did not provide reliable paleoclimatic indicators, due to weak pedogenesis and other controlling factors. The GSIm records demonstrated a precipitation maximum in summer before ∼15 ka, shifting to a maximum in spring after ∼15 ka, probably associated with large-scale modulation of the latitudinal climatic zones and atmospheric circulation in response to retreat of the Northern Hemisphere ice sheets. Based on the ΔL∗ records, we place emphases on the important role of temperature-modulated evaporation in moisture evolution across CA; however, this has only influenced moisture evolution in spring and summer, with little effect on winter moisture conditions. Moreover, the ΔL∗ records may also indicate that atmospheric humidity can partly affect the long-term effective moisture variations. © 2020 Elsevier Ltd
英文关键词	Central Asia; Climate dynamics; Color; Forcing mechanisms; Grain size; Loess; Moisture
语种	英语
scopus关键词	Atmospheric humidity; Global warming; Magnetic susceptibility; Sediments; Springs (components); Atmospheric circulation; Controlling factors; Frequency dependent; Future climate; Moisture conditions; Moisture variation; Northern Hemispheres; Paleoclimate studies; Moisture; aridification; aridity; atmospheric circulation; climate change; dating method; global warming; ice sheet; loess; Northern Hemisphere; paleoclimate; pedogenesis; precipitation (climatology); reconstruction; seasonal variation; Central Asia; Kyrgyzstan; Tien Shan
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151263
作者单位	State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Institute of Geology, National Academy of Sciences of Kyrgyz Republic, Bishkek, 720040, Kyrgyzstan; Applied Geology Department, American University of Central Asia, Bishkek, 720060, Kyrgyzstan; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China; Research Center for Ecology and Environment of Central Asia (Bishkek), Bishkek, 720040, Kyrgyzstan
推荐引用方式 GB/T 7714	Li Y.,Song Y.,Orozbaev R.,et al. Moisture evolution in Central Asia since 26 ka: Insights from a Kyrgyz loess section; Western Tian Shan[J],2020,249.
APA	Li Y.,Song Y.,Orozbaev R.,Dong J.,Li X.,&Zhou J..(2020).Moisture evolution in Central Asia since 26 ka: Insights from a Kyrgyz loess section; Western Tian Shan.Quaternary Science Reviews,249.
MLA	Li Y.,et al."Moisture evolution in Central Asia since 26 ka: Insights from a Kyrgyz loess section; Western Tian Shan".Quaternary Science Reviews 249(2020).