乌鲁木齐冬季焚风天气过程大气扩散条件特征分析

doi:10.12118/j.issn.1000–6060.2021.06.03

Abstract

Abstract:

On the basis of hourly surface meteorological data, radiosonde second-level data, and wind profile radar data collected from 2013 to 2017, the low-level foehn wind and its evolution characteristics in Urumqi City, Xinjiang, China, were identified. According to various calculation parameters and methods in the boundary layer, including mixed layer thickness, inversion layer thickness, ventilation coefficient, and static stability index, the variation of the boundary-layer diffusion conditions in Urumqi City during the evolution of low-level foehn wind were analyzed. The results demonstrated that the atmospheric diffusion conditions in Urumqi City have been most favorable in summer and worst in winter (maximum thickness of the mixed layer=0.44×10³ m; ventilation coefficient=1.52×10³ m²·s^-1; inversion layer thickness=768 m; temperature difference of the inversion layer=4.82 ℃; static stability index=6.36), and December and January were extremely unfavorable in terms of pollutant diffusion. In the five stages of low-level foehn evolution, the thickness of the atmospheric mixing layer and the ventilation coefficient first increased and then decreased, and the value has been the lowest in the vigorous period of foehn development. The thickness, strength, and static stability index of the inversion layer were opposite, and the maximum value occurred in the vigorous period. The air pressure at each station also decreased during the development and the prosperous period of the foehn weather process. The temperature and wind speed of the high-altitude station at the bottom of the foehn increased, whereas those of the low-altitude station decreased, indicating that the foehn made the lower atmosphere more stable and was not conducive to the diffusion of pollutants. Generally, horizontal diffusion capacity and vertical exchange capacity are weakened by foehn, and the atmosphere is easy to condense. For future operations, the foehn development trend can be used to predict diffusion conditions, providing a reference for the air pollution forecast and the control of urban agglomeration in Urumqi City.

Key words: low-altitude foehn, boundary layer diffusion conditions, meteorological elements, Urumqi City

ZHAO Keming,LI Na,LI Xia,SUN Mingjing,SHI Junjie,AN Dawei,PU Jie,ZHENG Bohua. Characteristic analysis of atmospheric diffusion conditions of winter foehn weather process in Urumqi City[J].Arid Land Geography, 2021, 44(6): 1534-1544.

Figures/Tables 7

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