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Late Holocene hydroclimatic variations and possible forcing mechanisms over the eastern Central Asia
Jianghu Lan;  Hai Xu;  Keke Yu;  Enguo Sheng;  Kangen Zhou;  Tianli Wang;  Yuanda Ye;  Dongna Yan;  Huixian Wu;  Peng Cheng;  Waili Abuliezi;  Liangcheng Tan
2019
发表期刊Science China Earth Sciences
卷号62期号:8页码:1288-1301
摘要

Hydroclimatic variations over the eastern Central Asia are highly sensitive to changes in hemispheric-scale atmospheric circulation systems. To fully understand the long-term variability and relationship between hydroclimate and atmospheric circulation system, we present a high-resolution lascustrine record of late Holocene hydroclimate from Lake Sayram, Central Tianshan Mountains, China, based on the total organic carbon, total nitrogen, and carbonate contents, carbon/nitrogen ratios, and grain size. Our results reveal four periods of substantially increased precipitation at the interval of 4000–3780, 3590–3210, 2800–2160, and 890–280 cal yr BP, and one period of slightly increased precipitation from 1700–1370 cal yr BP. These wetter periods broadly coincide with those identified in other records from the mid-latitude Westerlies-dominated eastern Central Asia, including the northern Tibetan Plateau. As such, a similar hydroclimatic pattern existed over this entire region during the late Holocene. Based on a close similarity of our record with reconstruction of North Atlantic Oscillation indices and solar irradiance, we propose that decreased solar irradiance and southern migration of the entire circum-North Atlantic circulation system, particularly the main pathway of the mid-latitude Westerlies, significantly influenced hydroclimate in eastern Central Asia during the late Holocene. Finally, the inferred precipitation at Lake Sayram has increased markedly over the past 100 years, although this potential future changes in hydroclimate in Central Asia need for further investigation.

关键词Lake Sayram hydroclimatic Variation late Holocene mid-latitude Westerlies north Atlantic Oscillation Index
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10860
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
2.Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China
3.Key Laboratory of Disaster Monitoring and Mechanism Simulating of Shaanxi Province, Baoji University of Arts and Sciences, Baoji 721013, Shaanxi, China
4.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
5.University of Chinese Academy of Sciences, Beijing 100049, China
6.Administrative Committee of Lake Sayram, Bozhou 833400, China
7.Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an 710049, China
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GB/T 7714
Jianghu Lan;Hai Xu;Keke Yu;Enguo Sheng;Kangen Zhou;Tianli Wang;Yuanda Ye;Dongna Yan;Huixian Wu;Peng Cheng;Waili Abuliezi;Liangcheng Tan. Late Holocene hydroclimatic variations and possible forcing mechanisms over the eastern Central Asia[J]. Science China Earth Sciences,2019,62(8):1288-1301.
APA Jianghu Lan;Hai Xu;Keke Yu;Enguo Sheng;Kangen Zhou;Tianli Wang;Yuanda Ye;Dongna Yan;Huixian Wu;Peng Cheng;Waili Abuliezi;Liangcheng Tan.(2019).Late Holocene hydroclimatic variations and possible forcing mechanisms over the eastern Central Asia.Science China Earth Sciences,62(8),1288-1301.
MLA Jianghu Lan;Hai Xu;Keke Yu;Enguo Sheng;Kangen Zhou;Tianli Wang;Yuanda Ye;Dongna Yan;Huixian Wu;Peng Cheng;Waili Abuliezi;Liangcheng Tan."Late Holocene hydroclimatic variations and possible forcing mechanisms over the eastern Central Asia".Science China Earth Sciences 62.8(2019):1288-1301.
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