利用欧洲中期天气预报中心(ECMWF)数值预报产品和德国数值预报产品,对宁夏石嘴山市2014年2月4—6日一次久旱转连阴雪天气过程的预报能力进行了对比分析检验。结果表明,此次过程中ECMWF数值预报模式较德国模式的形势场预报准确,随着预报...利用欧洲中期天气预报中心(ECMWF)数值预报产品和德国数值预报产品,对宁夏石嘴山市2014年2月4—6日一次久旱转连阴雪天气过程的预报能力进行了对比分析检验。结果表明,此次过程中ECMWF数值预报模式较德国模式的形势场预报准确,随着预报时效的延长,两种模式的预报准确率也均随之降低;从要素预报来看,24、48、72 h 700 h Pa湿度场及850 h Pa温度场两种模式预报结果均较实况偏差较大,但72 h比24、48 h预报更接近实况。展开更多
The authors use numerical model integral products in a third level forecast of synthetically multi-level analog forecast technology.This is one of the strongest points of this study,which also includes the re-ducing m...The authors use numerical model integral products in a third level forecast of synthetically multi-level analog forecast technology.This is one of the strongest points of this study,which also includes the re-ducing mean vacant-forecast rate method,which pos-sesses many advantages with regard to filtering the analog term.Moreover,the similitude degree between samples is assessed using a combination of meteorological elements,which works better than that described using a single element in earlier analog forecast studies.Based on these techniques,the authors apply the model output,air sounding,surface observation and weather map data from 1990 to 2002 to perform an analog experiment of the quasi-stationary front rainstorm.The most important re-sults are as follows:(1) The forecast successful index is 0.36,and was improved after the forecast model was re-vised.(2) The forecast precise rate (0.59) and the lost-forecast rate (0.33) are also better than those of other methods.(3) Based on the model output data,the syn-thetically multilevel analog forecast technology can pro-duce more accurate forecasts of a quasi-stationary front rainstorm.(4) Optimal analog elements reveal that trig-gering mechanisms are located in the lower troposphere while upper level systems are more important in main-taining the phase of the rainstorm.These variables should be first taken into account in operational forecasts of the quasi-stationary front rainstorm.(5) In addition,experi-ments reveal that the position of the key zone is mainly decided by the position of the system causing the heavy rainfall.展开更多
文摘利用欧洲中期天气预报中心(ECMWF)数值预报产品和德国数值预报产品,对宁夏石嘴山市2014年2月4—6日一次久旱转连阴雪天气过程的预报能力进行了对比分析检验。结果表明,此次过程中ECMWF数值预报模式较德国模式的形势场预报准确,随着预报时效的延长,两种模式的预报准确率也均随之降低;从要素预报来看,24、48、72 h 700 h Pa湿度场及850 h Pa温度场两种模式预报结果均较实况偏差较大,但72 h比24、48 h预报更接近实况。
基金financially supported by the National Basic Research Program of China (Grant No. 2009CB421 401)
文摘The authors use numerical model integral products in a third level forecast of synthetically multi-level analog forecast technology.This is one of the strongest points of this study,which also includes the re-ducing mean vacant-forecast rate method,which pos-sesses many advantages with regard to filtering the analog term.Moreover,the similitude degree between samples is assessed using a combination of meteorological elements,which works better than that described using a single element in earlier analog forecast studies.Based on these techniques,the authors apply the model output,air sounding,surface observation and weather map data from 1990 to 2002 to perform an analog experiment of the quasi-stationary front rainstorm.The most important re-sults are as follows:(1) The forecast successful index is 0.36,and was improved after the forecast model was re-vised.(2) The forecast precise rate (0.59) and the lost-forecast rate (0.33) are also better than those of other methods.(3) Based on the model output data,the syn-thetically multilevel analog forecast technology can pro-duce more accurate forecasts of a quasi-stationary front rainstorm.(4) Optimal analog elements reveal that trig-gering mechanisms are located in the lower troposphere while upper level systems are more important in main-taining the phase of the rainstorm.These variables should be first taken into account in operational forecasts of the quasi-stationary front rainstorm.(5) In addition,experi-ments reveal that the position of the key zone is mainly decided by the position of the system causing the heavy rainfall.
