Abrupt Freshening Since the Early Little Ice Age in Lake Sayram of Arid Central Asia Inferred From an Alkenone Isomer Proxy
Hydroclimatic variations of arid central Asia (ACA) significantly impact regional ecosystems and human civilizations. Here we present a lake water salinity record of the last 3,000 years from Lake Sayram in the core area of ACA using a new alkenone isomer-based RIK(37)index. Our record shows an abru...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , , , , , |
Format: | Report |
Language: | English |
Published: |
AMER GEOPHYSICAL UNION
2020
|
Subjects: | |
Online Access: | http://ir.ieecas.cn/handle/361006/15243 http://ir.ieecas.cn/handle/361006/15244 https://doi.org/10.1029/2020GL089257 |
Summary: | Hydroclimatic variations of arid central Asia (ACA) significantly impact regional ecosystems and human civilizations. Here we present a lake water salinity record of the last 3,000 years from Lake Sayram in the core area of ACA using a new alkenone isomer-based RIK(37)index. Our record shows an abrupt decrease in salinity by more than 5 parts per thousand since the "early" Little Ice Age (LIA) (about CE 1150), which can be attributed to the combined effect of regional wetting, cooling, and topographic features. Combined with other moisture records in the region, we find two periods of relatively wet conditions during CE 1150-1550 and 1850 to present, which may be linked to Arctic sea ice expansion due to natural variability and, from CE 1950, anthropogenically induced warming. The wet conditions during CE 1206-1260 may have favored the spread of the Mongol Empire across the entire core area of ACA. |
---|