Spatiotemporal Variation of Water Vapor Budget over the Tibetan Plateau and Its Regulation on Precipitation

IF 1.5 4区 地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES 热带气象学报 Pub Date : 2022-01-01 DOI:10.46267/j.1006-8775.2022.015
Wang Hui-mei, Z. Ping
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引用次数: 2

Abstract

: The spatiotemporal variations of water vapor budget (Bt) and their relationships with local precipitation over the Tibetan Plateau (TP) are critical for understanding the characteristics of spatial distributions and evolutions of water resources over the TP. Based on a boundary of the TP, this paper explored the spatiotemporal characteristics of Bt over the TP using the European Centre for Medium-Range Weather Forecasts interim (ERA-Interim) reanalysis datasets. On the climatological mean, the TP is a water vapor sink throughout four seasons and the seasonal variation of Bt is closely associated with the water vapor budget at the southern boundary of the TP. The transient water vapor transport is quasi-meridional in the mid- and high-latitude areas and plays a leading role in winter Bt but contributes little in other seasons. At the interannual timescale, the variation of Bt is mainly determined by anomalous water vapor transports at the western and southern boundaries. The Bay of Bengal, the North Arabian Sea, and mid-latitude West Asia are the main sources of excessive water vapor for a wetter TP. At the southern and western boundaries, the transient water vapor budget regulates one-third to four-fifths of Bt anomalies. Moreover, the variability of the TP Bt is closely associated with precipitation over the central-southern and southeastern parts of the TP in summer and winter, which is attributed to the combined effect of the stationary and transient water vapor budgets. Given the role of the transient water vapor transport, the linkage between the TP Bt and local precipitation is tighter.
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青藏高原水汽收支时空变化及其对降水的调控
:青藏高原水汽收支(Bt)的时空变化及其与局地降水的关系对了解青藏高原水资源的空间分布和演变特征至关重要。基于青藏高原边界,利用欧洲中期天气预报中心(ERA-Interim)再分析数据,探讨了青藏高原上空Bt的时空特征。在气候平均值上,青藏高原是一个贯穿四季的水汽汇,青藏高原南边界的水汽收支与季节变化密切相关。中高纬地区瞬态水汽输送为准经向输送,在冬季起主导作用,其他季节贡献不大。在年际尺度上,Bt的变化主要由西部和南部边界的异常水汽输送决定。孟加拉湾、北阿拉伯海和中纬度西亚是较湿润总水汽的主要来源。在南部和西部边界,瞬态水汽收支调节了三分之一到五分之四的Bt异常。夏季和冬季,青藏高原中南部和东南部的降水与青藏高原Bt的变率密切相关,这主要是由于稳定和瞬态水汽收支的共同作用。考虑到瞬态水汽输送的作用,TP Bt与局地降水的联系更为紧密。
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来源期刊
热带气象学报
热带气象学报 METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
1.80
自引率
8.30%
发文量
2793
审稿时长
6-12 weeks
期刊介绍: Information not localized
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