Simulation of a torrential rainstorm in Xinjiang and gravity wave analysis

• 来源期刊: 中国物理B（英文版）
• 关键词: gravity wave rainstorm spectral analysis methods weather research and forecasting model
• 年，卷（期）: 2018,（5）
• 页码范围: 573-580
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/5/059201

摘要

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.