青藏高原降水对初始土壤水分的响应:边界层垂直热扩散和水汽扩散的各自影响

IF 2.8 3区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Feimin Zhang, Kaixuan Bi, Sentao Wei, Chenghai Wang
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引用次数: 0

摘要

本研究探讨了青藏高原初始土壤湿度对降水模拟的影响,以及边界层垂直扩散对热量(Kh)和水汽(Kq)的各自影响。结果表明,边界层垂直扩散对土壤水分的响应主要在白天明显。较湿的地表对应较弱的垂直扩散,可加强低层大气的热强迫和动力抬升,并促进边界层顶部附近的水汽饱和,防止环境干燥空气的夹带/侵入,这些都有利于增加对流和降水。TP上空较湿的陆面可以加强TP西北部冷与TP东南部暖的对比,有利于降水的东南传播。从热量和水汽的角度来看,Kh 影响大气的稳定性,而 Kq 影响水汽及其在边界层的垂直输送。通过影响边界层中水汽和大气稳定条件的相对重要性,Kh 和 Kq 对降水强度具有竞争效应。调整 Kh 和 Kq 的相对强度将使竞争效应失效。较强的 Kh 和较弱的 Kq 将抑制水汽向边界层顶部的垂直输送,并削弱边界层中的对流不稳定性,从而减轻高估的降水量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Response of Precipitation to Initial Soil Moisture over the Tibetan Plateau: Respective Effects of Boundary Layer Vertical Heat and Vapor Diffusions
This study investigates the influences of initial soil moisture over the Tibetan Plateau (TP) on precipitation simulation, and the respective effects of boundary layer vertical diffusion for heat (Kh) and vapor (Kq). Results indicate that the responses of boundary layer vertical diffusion to soil moisture are obvious mainly in the daytime. Wetter land surface corresponds to weaker vertical diffusion, which could strengthen thermal forcing and dynamic lifting in the lower atmosphere, and encourage water vapor saturation near the top of boundary layer to prevent the environmental dry air entrainment/invasion, these would be beneficial to more convection and precipitation. Wetter land surface over the TP could enhance the contrast between the cold in the northwestern TP and the warm in the southeastern TP, which would be conducive to the southeastward propagation of precipitation. The simulation of heat and moisture in the boundary layer could be improved by perturbing the relative intensity of Kh and Kq. From the perspective of heat and moisture, Kh affects atmospheric stability, while Kq affects moisture and its vertical transport in the boundary layer. The Kh and Kq have competitive effects on precipitation intensity by influencing relative importance of moisture and atmospheric stability conditions in the boundary layer. Adjusting the relative intensity of Kh and Kq would deactivate the competitive effects. Stronger Kh but weaker Kq would alleviate the overestimated precipitation by inhibiting vertical transport of moisture to the top of boundary layer and attenuating convective instability in the boundary layer.
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来源期刊
Monthly Weather Review
Monthly Weather Review 地学-气象与大气科学
CiteScore
6.40
自引率
12.50%
发文量
186
审稿时长
3-6 weeks
期刊介绍: Monthly Weather Review (MWR) (ISSN: 0027-0644; eISSN: 1520-0493) publishes research relevant to the analysis and prediction of observed atmospheric circulations and physics, including technique development, data assimilation, model validation, and relevant case studies. This research includes numerical and data assimilation techniques that apply to the atmosphere and/or ocean environments. MWR also addresses phenomena having seasonal and subseasonal time scales.
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