青藏高原东南部及其邻近地区FY-2E卫星晴空大气可降水量评估

为了解青藏高原东南部及邻近地区FY-2E卫星大气可降水量(FY-2ETPW)的可靠性,利用2010~2012年探空计算值(RS TPW)对其进行对比分析。结果表明:青藏高原地区月平均FY-2ETPW除7月偏小外,其余月份都偏大,相对偏差仅有6月和7月在25%以内,其余月份都在50%以上,尤其是1月高达780.45%,FY-2ETPW与RS TPW之间为负相关系数,FY-2ETPW在青藏高原地区不可靠;低海拔地区,6月和7月平均FY-2ETPW偏小,其余月份都偏大,5~8月相对偏差不足4%,但1月相对偏差却高达105.84%;低海拔地区4~10月,FY-2E TPW与RS TPW相关系数大于0.5,FY-2ETPW订正模型估计标准误差为6.57mm,个别站点误差较大,还有待进一步的改进。

EVALUATION OF TOTAL PRECIPITABLE WATER DERIVED FROM FY-2E SATELLITE DATA OVER THE SOUTHEAST OF TIBETAN PLATEAU AND ITS ADJACENT AREAS

In order to understand the reliability of total precipitable water vapor (TPW) derived from FY 2E satellite data over the Southeast of Tibetan Plateau and its adjacent areas, FY 2E TPWs are compared with the radiosonde (RS) TPWs during the period from 2010-2012. The results show that over the Tibetan Plateau the average monthly FY 2E TPWs are larger than RS TPWs except in July. The relative errors are less than 25% in June and July and more than 50% in other months, especially in January as high as 78045%. The correlation coefficient between FY 2E TPW and RS TPW is negative. Over the low altitudes the average monthly FY 2E TPWs are larger than RS TPWs in June and July and smaller in other months. The relative errors are less than 4% in May to August, but in January as high as 105.84%. The correlation coefficient is greater than 0.5 during the period from April to October. The linear correction model of FY 2E TPW with a standard error of 6.57 mm could be improved to count error in individual sites.