典型文献
Height Variation in the Summer Quasi-Zero Wind Layer over Dunhuang,Northwest China:A Diagnostic Study
文献摘要：
This study investigates the variation in the stratospheric quasi-zero wind layer(QZWL)over Dunhuang,Gansu Province,China,on 9 August 2020 using sounding observations from the Dunhuang national reference station and the fifth generation of ECMWF atmospheric reanalysis data(ERA5).The QZWL over Dunhuang was located between 18.6 and 20.4 km on 9 August 2020.The South Asian high(SAH)and subtropical westerly jet jointly af-fected the QZWL.As the SAH retreated westward,the upper-level westerly jet over Dunhuang strengthened,and the jet axis height increased.As a result,the zonal westerly wind was lifted to a higher altitude,and the wind speed of 100-70 hPa increased,raising the QZWL.In addition,the east-west oscillation of the SAH occurred earlier than the adjustment of the QZWL altitude,which can be used as a forecasting indicator for the QZWL.To further explore the mechanism responsible for the QZWL adjustment,the forcing terms in the equations for zonal wind,kinetic energy,and vertical wind shear were analyzed.The results showed that the upper-level geopotential gradient was the basic physical factor forcing the local change in zonal wind and kinetic energy.The change in zonal wind and kinetic en-ergy led to the uplift of the QZWL.The results revealed that the vertical shear of horizontal wind could adequately indicate the stratospheric QZWL location.
文献关键词：
中图分类号：
作者姓名：
Yi YUAN;Yi LIU;Lingkun RAN;Hua ZHANG
作者机构：
School of Environmental Studies,China University of Geosciences,Wuhan 430074;Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029;State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,China Meteorological Administration,Beijing 100081
文献出处：
引用格式：
[1]Yi YUAN;Yi LIU;Lingkun RAN;Hua ZHANG-.Height Variation in the Summer Quasi-Zero Wind Layer over Dunhuang,Northwest China:A Diagnostic Study)[J].气象学报（英文版）,2022(04):618-630
A类：
QZWL
B类：
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AB值：
0.530741
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