Analysis and Numerical Simulation of Characteristics of Wind Field at Low-level Stratosphere over Xinjiang Region in Summer
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Abstract:
The evolution characteristics of the wind field at the lowlevel stratosphere are analyzed based on FNL reanalysis data from June to August 2017. After that, highresolution numerical simulations of the wind field at the lowlevel stratosphere are evaluated by sounding data at the Urumqi station. Results show that the temporal transition of the stratosphere zonal wind over the Xinjiang region varied with latitude. Meanwhile, the starting and ending time of the quasizero wind layer also varied with latitude. Starting time of the quasizero wind layer was earlier in the southern region than in the northern region. However, it was the opposite of the ending time. In summer, the quasizero wind layer existed between 70 hPa and 40 hPa over the Xinjiang region. Variation of the quasizero wind layer altitude presented a trend of declining first and then rising later. Results of the numerical simulation of the quasizero wind layer showed that the trends of the quasizero wind layer parameters over time displayed good agreement between simulations and soundings. The mean absolute error of the initial height of the quasizero wind layer was 467 m. The rootmeansquare error of wind speed at the initial height of the quasizero wind layer was 1.75 m/s.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.