陆面热力因子应用于中国夏季降水预测的初步试验

A preliminary test of the summer rainfall prediction in China based on the land surface thermal factors

基于对中国东部夏季降水与欧亚大陆土壤温度和全球海表温度的相关分析,选取不同关键区的土壤温度和海表温度作为夏季降水的预测因子。利用1961-1990年的资料,分别以土壤温度作为第1组预测因子,海表温度作为第2组预测因子,综合海表温度与土壤温度因子作为第3组预测因子,使用改进的典型相关分析和集合典型相关分析法对中国东部夏季降水场进行预测,建立了相应的预测模型。然后,利用1991—2010年的资料进行了独立样本预测试验。在独立样本预测试验中,综合海表温度与土壤温度因子建立的模型比只用海表温度进行预测的各项预测评分高,说明加入土壤温度因子后预测效果有所提高。基于陆面热力因子的预测模型对夏季降水有一定的技巧,而综合海温与陆面热力因子的预测模型对中国东部夏季降水有较高的预测能力。

Based on the correlation analysis between the April soil temperature （ST）over the Eurasian continent,the global sea surface temperature （SST）in the previous winter and the summer precipitation in eastern China,STs and SSTs over the key regions are selected as the predictors of the summer rainfall prediction.Based on the observations during the period 1961 -1990,the BarnettˉPreisendorfer canonical correlation analysis （BPˉCCA）and the ensemble canonical correlation analysis （ECC） are used to build statistical prediction models of the summer rainfall in eastern China with taking ST,SST or SST combined with ST as the predictors,respectively.The independent sample test is performed by using the observations during 1991 -2010.The results show that the model using SST combined with ST as predictor exhibits higher predictive skill than that only using one of them,implying that consideration of the ST improves the performance of the prediction model.The prediction model based on the land surface thermal factors has some skills in predicting the summer precipitation in eastern China,and the way using the combination of SST with ST shows a better performance in the summer precipitation prediction.