GMS-5估计可降水量的研究

STUDY OF TOTAL PRECIPITABLE WATER BY GMS5

文章证明了由静止气象卫星ＧＭＳ－５的分裂窗通道和水汽通道亮温反演可降水量的可行性，探讨了ＧＭＳ－５红外通道亮温与可降水量的关系，建立了由３个通道亮温反演可降水量的经验公式．用６０组大气平均廓线，对公式模拟检验误差为０．１８ｇ／ｃｍ２，而用实际１２４组探空和对应的ＧＭＳ－５亮温资料进行检验，误差为０．４０ｇ／ｃｍ２．用得到的经验公式可反演大范围的晴空可降水量分布．

The feasibility for the retrieval of precipitable water(PW) by using GMS5 infrared“Split Window”and vapor channel brightness temperatures (BT) is demonstrated. The relationship between GMS5 IR channel BT and PW is discussed and an empirical formula of retrieval PW is presented by using the three channels of BT. The results show that RMS errors simulated from 60 groups of atmospheric mean profiles and retrieved by GMS5 realtime BT data and 124 radiosonde data are 0.18 g/cm2 and 0.40 g/cm2, respectively. The wide range PW distribution of clear air can be retrieved by using this empirical formula.