Humidity changes and possible forcing mechanisms over the last millennium in arid Central Asia
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Published:2022-05-06
Issue:5
Volume:18
Page:975-988
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
Feng Shengnan, Liu XingqiORCID, Shi FengORCID, Mao Xin, Li Yun, Wang Jiaping
Abstract
Abstract. Hydroclimate changes have exerted a significant influence on the historical
trajectory of ancient civilizations in arid Central Asia where the central
routes of the Silk Road have been hosted. However, the climate changes on
different timescales and their possible forcing mechanisms over the last
millennium remain unclear due to low-resolution records. Here, we provide a
continuous high-resolution humidity history in arid Central Asia over the
past millennium based on the ∼1.8-year high-resolution
multiproxy records with good chronological control from Lake Dalongchi in
the central Tian Shan. Generally, the climate was dry during the
Medieval Warm Period (MWP) and Current Warm Period (CWP) and wet during the
Little Ice Age (LIA), which could be attributed to the influence of the
North Atlantic Oscillation (NAO) and the Atlantic Multidecadal Oscillation
(AMO). Furthermore, we find that the humidity oscillation was dramatic and
unstable at multidecadal to century scales. Especially within the LIA, four
wet episodes and three dry periods occurred. The continuous wavelet analysis
and wavelet coherence show that the humidity oscillation is modulated by the
Gleissberg cycle at the century scale and by the quasi-regular period of El
Niño–Southern Oscillation (ENSO) at the multidecadal scale. Our findings
suggest that the effect of the solar cycle and the quasi-regular period of
ENSO should be seriously evaluated for hydroclimate predictions and climate
simulations in arid Central Asia in the future.
Funder
National Key Research and Development Program of China National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
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