科研之友
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摘要
By using the principle of physical decomposition of atmospheric variables from troposphere to stratosphere, it was found that the 400 hPa regional-scale positive temperature anomaly and the 250 hPa regional-scale positive geo-potential height anomaly can well indicate the ground higher temperature and heat wave (HW) events. Theoretical analysis and case study present that near 43 degrees N the regional-scale quasi-stationary wavelength reaches its maximum, where the wave is stable to produce regional-persistent HW events. The regional-scale quasi-stationary waves associated with dry HW events in South China, the south of Yangtze River, along the middle and lower reaches of the Yangtze River and North China remain above 6. 5 days. The center of regional-scale quasi-stationary wave is 6 similar to 12 latitudes in the north of regional dry HW central positions on average. The northwestward-shift regional-scale wave in the low latitudes (on the south of the Subtropical High) becomes stationary only when it reaches the westerly region in the north of the Subtropical High ridge.
- 出版日期2012-5
- 单位北京大学
