王圣杰|西北师范大学分享 http://blog.sciencenet.cn/u/Z2112132 新疆降水同位素 Stable Water Isotopes in Arid Central Asia

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[转载]JGR-Atmospheres2017:水汽路径对新疆天山降水同位素的影响

已有 596 次阅读 2021-11-11 14:22 |个人分类:亚洲中部干旱区同位素|系统分类:论文交流|文章来源:转载

Shengjie Wang, Mingjun Zhang, Jagoda Crawford, Catherine E. Hughes, Mingxia Du, Xuemei Liu. The effect of moisture source and synoptic conditions on precipitation isotopes in arid central Asia. Journal of Geophysical Research: Atmospheres, 2017, 122(5): 2667–2682. DOI: 10.1002/2015JD024626.

https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2015JD024626


Abstract

The stable isotope composition of precipitation has been widely applied to trace moisture sources. In the westerly dominated areas of central Asia, the isotopic composition of precipitation significantly correlates with surface air temperature, and the temperature effect is widely accepted. However, the significance of isotopes in tracing water vapor source is not clear for this region, and a further investigation using event-based observations is still needed. Based on a network around the Tianshan Mountains, the westerly regime of precipitation isotopes is investigated. Although the seasonality of precipitation isotopes for the northern and southern basins of the Tianshan Mountains is similar, the more arid climate and leeward landform of the southern basin lead to weak moisture transport and relatively enriched oxygen isotopes. Of the synoptic systems resulting in heavy precipitation, the central Asian vortex more commonly leads to depleted isotopic ratios in precipitation, which is related to the contribution of northerly moisture and/or surface moisture. The specific humidity-adjusted Lagrangian diagnostic indicates that the heavy precipitation on the southern basin stations usually has relatively local moisture sources in this arid climate and that terrestrial moisture evaporated from Europe and central Asia, rather than marine moisture from the Atlantic Ocean, is more likely to be the direct moisture source. A sensitivity analysis for target height and adjusting threshold of specific humidity is also applied to the improved Lagrangian diagnostic. Overall, the findings were unaffected by different conditions, and the moisture was more likely to be locally sourced, as indicated by higher specific humidity thresholds.




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