基于CLDAS数据的广西晚稻寒露风监测精准度评估

Evaluation of Cold Dew Wind Monitoring Precision for Late Rice Based on CLDAS Data in Guangxi

为广西晚稻生产寒露风低温冷害的监测提供参考,利用中国陆面同化系统(CLDAS)气温产品,结合多源卫星数据库的水稻种植本底信息,参考寒露风灾害监测指标,对广西2011年9月19—27日的晚稻寒露风低温过程进行动态监测,以验证CLDAS提供数据的精准度。结果表明:此次寒露风造成广西晚稻重度受灾面积3 159.76km^2,中度受灾面积559.77km^2,轻度受灾面积2 452.14km^2;CLDAS反演气温与12个验证气象站点实测气温的相关系数均大于0.93,日平均温差为0.3℃;CLDAS反演的最高气温和最低气温与气象站点实测相应气温的时间差小于1h。CLDAS提供的气温数据与实际监测的气温数据较一致,并具有快速详细监测当地晚稻寒露风灾害等级分布状况的优势,且精准度较高。CLDAS可用于广西地区晚稻生产的寒露风天气监测。

The low temperature process of cold dew wind（from September 19 to 27 in 2011）for late rice production was dynamically monitored by using CLDAS temperature,combining with the background information of rice cultivation from multi-source satellite database and referencing monitoring indexes of cold dew wind disaster to verify the precision of CLDAS data and to provide a reference for monitoring of chilling damage caused by cold dew wind in late rice production in Guangxi.Result：The severe,moderate and mild damage area of late rice caused by the cold dew wind is 3 159.76 km^2,559.77 km^2 and2 452.14 km^2 respectively.The correlation coefficients between CLDAS inversion temperature and actual temperature of 12 verification meteorological stations all are more than 0.93 and the difference in daily average temperature is 0.3℃.The time difference between maximum and minimum temperature provided by CLDAS and corresponding actual temperature from 12 meteorological stations is less than 1 h.The temperature data provided by CLDAS is in accordance with actual temperature data.CLDAS with an advantage of rapidly,minutely and accurately monitoring grade distribution of local cold dew wind disaster for late rice can be used in monitoring of cold dew wind in late rice production in Guangxi.