Controls on Stable Water Isotopes in Monsoonal Precipitation Across the Bay of Bengal: Atmosphere and Surface Analysis

Zhang, Jingyi, Yu, Wusheng, Lewis, Stephen, Thompson, Lonnie G, Bowen, Gabriel J, Yoshimura, Kei, Werner, Martin, Chakraborty, Supriyo, Jing, Zhaowei, Ma, Yaoming, Guo, Xiaoyu, Xu, Baiqing, Wu, Guangjian, Guo, Rong, Qu, Dongmei, and Cauquoin, Alexandre (2023) Controls on Stable Water Isotopes in Monsoonal Precipitation Across the Bay of Bengal: Atmosphere and Surface Analysis. Geophysical Research Letters, 50 (5). e2022GL102229.

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Abstract

Stable hydrogen isotopes in monsoonal precipitation (δDp) at three sites (Port Blair, Barisal and Darjeeling) reveal the factors governing δDp variations over a south-north gradient across the Bay of Bengal. We found that the δDp at each site continuously decreases from May to September and these trends become more pronounced from south to north. The decreasing trends of downstream δDp closely follow the decreasing trends of upstream stable hydrogen isotopes in water vapor (δDv), which indicates that upstream δDv properties shape initial spatiotemporal patterns of the downstream δDp (“shaping effect”). Additionally, our results demonstrate that, during moisture transport, upstream vertical air motions (convection and downward motion) and topographic relief magnify the amplitude of the decreasing trends of downstream δDp (“magnifying effect”). Our findings imply that upstream δDv properties and relevant atmospheric and topographical conditions along the moisture transport pathway need to be considered collectively to better interpret paleoclimate records.

Item ID: 78821
Item Type: Article (Research - C1)
ISSN: 1944-8007
Copyright Information: © 2023. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date Deposited: 06 Jun 2023 02:11
FoR Codes: 37 EARTH SCIENCES > 3701 Atmospheric sciences > 370104 Atmospheric composition, chemistry and processes @ 35%
37 EARTH SCIENCES > 3703 Geochemistry > 370303 Isotope geochemistry @ 35%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management @ 30%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1801 Air quality, atmosphere and weather > 180103 Atmospheric processes and dynamics @ 70%
18 ENVIRONMENTAL MANAGEMENT > 1806 Terrestrial systems and management > 180699 Terrestrial systems and management not elsewhere classified @ 30%
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