科研之友
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摘要
Power spectrum and wavelet were used to analyze data from 6 wind profiler stations in the Beijing-Tianjin-Hebei city cluster area during summer 2010. The results show the differences of frequencies among 6 stations are smaller closer to the ground, and bigger farther away from the ground. The differences of frequencies greater than 1-day are smaller than the frequencies less than 1-day. Obvious diurnal oscillations, which are different with locations of stations and effects by topography, are identified at hundreds meters level for all of stations. The spectra of some stations below 1 km indicate 5/3 power-law scaling regions for the frequencies higher than diurnal. High frequencies, less than 1 day, at lower level usually are accompanied with rainfall, during which upper and lower winds oscillate and interact. Diurnal mean wind vectors show two wind transitions, which are 05 similar to 06 h LST and 20 similar to 21 h LST. More pronounced differences of wind directions are identified below 1500 m. Southerly winds occurrence and its depth are associated with mountain-valley breeze and sea breeze in this area. Wind speed correlation coefficients between stations increase with height. Suggestions for deploying wind profiler radars are given in this paper.
- 出版日期2016-5
