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

摘要

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,combined with the background information of rice cultivation from multi-source satellite database together with an reference to the monitoring indexes of cold dew wind disaster to verify the precision of CLDAS data,so as to provide a reference for monitoring chilling damage caused by cold dew wind in late rice production in Guangxi.The results showed that the cold wind dew caused heavy damage to an area of 3 159.76 km 2,moderate damage to an area of 559.77 km 2 and light damage to an area of 2 452.14 km 2.The correlation coefficients between CLDAS inversion temperature and actual temperature of 12 verification meteorological stations were all larger than 0.93,and the difference in daily average temperature was 0.3℃.The time difference between maximum and minimum temperature provided by CLDAS and corresponding actual temperature from 12 meteorological stations was less than 1 h.The temperature data provided by CLDAS was in accordance with actual temperature data.With an advantage of rapidly,minutely and accurately monitoring the grade distribution of local cold dew wind disaster for late rice,CLDAS can be used in monitoring cold dew wind in late rice production in Guangxi.