Regional differences in the effects of atmospheric moisture residence time on precipitation isotopes over Eurasia

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2024-11-22 DOI:10.1016/j.atmosres.2024.107813

Qinqin Wang , Yuwei Liu , Guofeng Zhu , Siyu Lu , Longhu Chen , Yinying Jiao , Wenmin Li , Wentong Li , Yuhao Wang

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Abstract

Regional variations in atmospheric moisture residence time (RT) highlight the need to obtain independent observation indexes to constrain different model-based estimates. Stable isotopes of oxygen and hydrogen naturally exist in water molecules that can provide such observational constraints. We analyzed the relationship between RT and precipitation isotopes (δ²H and δ¹⁸O) across different climatic zones in Eurasia from 1980 to 2020. Our analysis reveals that: (1) Both precipitation isotopes and RT showed significant increasing trends during 1980–2020. The increase in RT corresponds to weakened net isotopic distillation over Eurasia, suggesting reduced atmospheric circulation intensity under warming conditions. (2) The spatial patterns of RT and precipitation isotopes vary significantly among different moisture source regions, reflecting distinct moisture transport and precipitation formation processes. (3) On long-term scales, RT generally shows positive correlations with precipitation isotopes, except in plateau regions. The RT-δ¹⁸O relationship exhibits latitude-dependent variations, with similar slopes in regions sharing common moisture sources. These findings enhance our understanding of the long-term controls on precipitation isotopic composition and atmospheric moisture cycling patterns across Eurasia.

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大气水汽停留时间对欧亚大陆降水同位素影响的区域差异

大气湿气停留时间（RT）的区域性变化突出表明，需要获得独立的观测指标来制约不同的基于模式的估算。水分子中天然存在的氧和氢的稳定同位素可以提供这种观测约束。我们分析了 1980 年至 2020 年欧亚大陆不同气候带 RT 与降水同位素（δ2H 和 δ18O）之间的关系。我们的分析表明(1) 1980-2020 年间，降水同位素和 RT 均呈显著上升趋势。RT的增加与欧亚大陆上空净同位素蒸馏的减弱相对应，表明在气候变暖条件下大气环流强度减弱。(2）RT 和降水同位素的空间模式在不同水汽源区之间存在显著差异，反映了不同的水汽输送和降水形成过程。(3）在长期尺度上，除高原地区外，RT 一般与降水同位素呈正相关。RT 与δ18O 的关系呈现出纬度依赖性变化，在具有共同水汽来源的地区，两者的斜率相似。这些发现加深了我们对整个欧亚大陆降水同位素组成和大气水汽循环模式的长期控制的理解。

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.