GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Simulation of a torrential rainstorm in Xinjiang and gravity wave analysis |
Rui Yang(杨瑞)1,2, Yi Liu(刘毅)1, Ling-Kun Ran(冉令坤)1, Yu-Li Zhang(张玉李)1 |
1 Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract We used a weather research and forecasting model to simulate a torrential rainstorm that occurred in Xinjiang, China during June 16-17, 2016. The model successfully simulated the rainfall area, precipitation intensity, and changes in precipitation. We identified a clear wave signal using the two-dimensional fast Fourier transform method; the waves propagated westwards, with wavelengths of 45-20 km, periods of 50-120 min, and phase velocities mainly concentrated in the -25 m/s to -10 m/s range. The results of wavelet cross-spectral analysis further confirmed that the waves were gravity waves, peaking at 11:00 UTC, June 17, 2016. The gravity wave signal was identified along 79.17-79.93°E, 81.35-81.45°E and 81.5-81.83°E. The gravity waves detected along 81.5-81.83°E corresponded well with precipitation that accumulated in 1 h, indicating that gravity waves could be considered a rainstorm precursor in future precipitation forecasts.
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Received: 29 September 2017
Revised: 21 December 2017
Accepted manuscript online:
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PACS:
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92.60.-e
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(Properties and dynamics of the atmosphere; meteorology)
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92.60.Wc
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(Weather analysis and prediction)
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92.60.jf
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(Precipitation)
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Fund: Project supported by China Special Fund for Meteorological Research in the Public Interest (Grant No.GYHY201406002),the National Natural Science Foundation of China (Grant Nos.41575065 and 41405049),the National Natural Science Foundation International Cooperation Project,China (Grant No.41661144024),and Strategic Priority Research Program of Chinese Academy of Sciences (Grant No.XDA17010100). |
Corresponding Authors:
Ling-Kun Ran
E-mail: rlk@mail.iap.ac.cn
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Cite this article:
Rui Yang(杨瑞), Yi Liu(刘毅), Ling-Kun Ran(冉令坤), Yu-Li Zhang(张玉李) Simulation of a torrential rainstorm in Xinjiang and gravity wave analysis 2018 Chin. Phys. B 27 059201
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