Diagnosis of atmospheric circulation shifts in the central Tibetan Plateau: Evidence from stable isotopes

Li, Yao, Yu, Wusheng, Tian, Lide, Lewis, Stephen, Yoshimura, Kei, Weng, Cheng, Cui, Jiangpeng, Ma, Yaoming, Guo, Rong, Zhang, Jingyi, Jing, Zhaowei, Shao, Lili, Guo, Ziaoyu, and Wang, Yong (2023) Diagnosis of atmospheric circulation shifts in the central Tibetan Plateau: Evidence from stable isotopes. Atmospheric Research, 282. 106536.

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The productivity of the alpine meadows in the central Tibetan Plateau (TP) is usually linked to atmospheric circulation shifts between the westerlies and Indian monsoon. Hence, it is critical to identify the dates of these circulation shifts, i.e., the Indian monsoon onset and retreat. However, the exact timing of the Indian monsoon onset in the central TP is highly uncertain. Here, we diagnose the atmospheric circulation shifts in the central TP during 2016–2018 using hydrogen and oxygen stable isotopes. Our results show that the Indian monsoon onset was marked by sharp decreases of the stable isotopes in both water vapor and precipitation (δ2Hv and δ2Hp) in mid-late June, which is approximately one month later than previous findings. In the subsequent period, the Indian monsoon replaced the westerlies across the central TP, where water vapor and precipitation were characterized by persistently lower stable isotope values. Substantial increases of the δ2Hv and δ2Hp values in late September denoted the Indian monsoon retreat. The δ2Hv and δ2Hp values also record fluctuations of the Indian monsoon intensity and the occasional intrusions of the westerlies even during the monsoon season. Our findings propose that stable isotopes can be used as indicators of atmospheric circulation shifts and may act as potential indices to monitor the vegetation growth in the central TP.

Item ID: 78822
Item Type: Article (Research - C1)
ISSN: 1873-2895
Keywords: Atmospheric circulation shifts, Westerlies, Indian monsoon, Stable isotopes, Central Tibetan Plateau
Copyright Information: © 2022 Elsevier B.V. All rights reserved.
Date Deposited: 31 May 2023 01:29
FoR Codes: 37 EARTH SCIENCES > 3701 Atmospheric sciences > 370199 Atmospheric sciences not elsewhere classified @ 30%
37 EARTH SCIENCES > 3703 Geochemistry > 370303 Isotope geochemistry @ 30%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management @ 40%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1801 Air quality, atmosphere and weather > 180103 Atmospheric processes and dynamics @ 80%
18 ENVIRONMENTAL MANAGEMENT > 1806 Terrestrial systems and management > 180699 Terrestrial systems and management not elsewhere classified @ 20%
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