中国台风降水分离客观方法的改进研究

The Study on the Objective Technique for Partitioning Tropical Cyclone Precipitation in China

针对中国台风*降水的分离问题,对原客观分离方法进行改进研究。首先提出判别指标,然后对主、客观方法分离台风降水结果进行对比分析,在此基础上确定了将原客观方法中两个重要的参数由固定参数调整为可变参数的方案思路,并最终确定了最佳改进方案。结果显示,客观分离方法的改进效果十分明显。此外,对客观方法进行个例检验,并引入了美国卫星综合降水(CMORPH)资料,结果表明改进后客观方法在双台风降水和台风与中纬度系统相互作用产生的降水识别上均表现出较强的能力。

An advanced technique for partitioning tropical cyclone precipitation is studied. First, indices describing the differences between the subjective and objective partitioning precipitation are defined. Second, an idea for generating developing scheme was drawn up. changing the two important fixed parameters into variable parameters. Finally, the best scheme for the advanced technique is determined. Results show that the advanced technique has made a great improvement. Then, case verifications, especially with NOAA＇ s CMORPPI data, prove that the advanced technique showed relative strong ability in distinguishing precipitations from two different TCs or a TC with a mid-latitude system.