FY-3C VIRR大气可降水产品在新疆地区的精度评价

Accuracy Assessment of FY-3C VIRR Total Precipitable Water Products in Xinjiang

探讨FY-3C VIRR大气可降水产品在新疆地区的可靠性,基于探空数据,采用多评价指标,对FY-3C VIRR大气可降水量的旬产品和月产品进行全面评估。结果表明:FY-3C VIRR旬和月大气可降水产品与探空数据变化一致,但存在系统性高估;在一年时间中,旬产品和月产品均具有单峰变化特征,旬产品与探空数据的误差在4月上旬最小,9月下旬最大,而月产品在3月最小,9月最大;整体上,旬产品的均方根误差比月产品略大,但平均偏差、相关系数和相对误差均小于月产品;对单一站点,旬产品和月产品在伊宁的精度最高,阿勒泰、乌鲁木齐和库车的精度较高,东疆的哈密和南疆的喀什、若羌和和田的精度较差,民丰的精度最差。

In order to analyze the reliability of applying FY-3C VIRR total precipitable water products to Xinjiang Province,the accuracy of FY-3C VIRR ten-day and monthly total precipitable water products were assessed by using multiple evaluation indica-tors based on radiosonde data collected.The results indicate that FY-3C VIRR ten-day and monthly total precipitable water prod-ucts show good agreement with radiosonde data and systematic overestimation.The products have the characteristic of single peak variation in yearly scale.The error between the FY-3C VIRR ten-day total precipitable water product and the sounding data is the smallest in early April and the largest in late September,while the FY-3C VIRR monthly total precipitable water product is the smallest in March and the largest in September.The root mean square error of the FY-3C VIRR ten-day total precipitable water product is slightly larger than the FY-3C VIRR monthly total precipitable water product,but the average deviation,correlation co-efficient and relative error are less than the FY-3C VIRR monthly total precipitable water product.For a single site,Yining has the highest accuracy,and the accuracy of Altay,Urumqi and Kuqa is relatively high.The accuracy of Kashi,Ruoqiang and Hotan and Hami is poor,and Minfeng has the worst accuracy.