A comparison of cloud top heights computed from airborne lidar and MAS radiance data using CO2 slicing
A comparison of cloud top heights computed from airborne lidar and MAS radiance data using CO2 slicing
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DOI：
10.1029/1999jd900796
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发表时间：
1999-10
影响因子：
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通讯作者：
R. Frey;B. Baum;W. Menzel;S. Ackerman;C. Moeller;J. Spinhirne
中科院分区：
文献类型：
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作者：
R. Frey;B. Baum;W. Menzel;S. Ackerman;C. Moeller;J. Spinhirne
来自美国国家航空航天局 (NASA) ER-2 高空飞机上两台仪器的数据已被用于迄今为止最大规模的验证研究，以评估二氧化碳切片云高度算法的准确性。 MODIS（中分辨率成像光谱辐射计）机载模拟器 (MAS) 对上涌辐射率的红外测量用于生成云顶高度，然后与云激光雷达系统 (CLS) 得出的数据进行比较，在 0.532 毫米处使用双偏振操作。 1996 年 4 月和 5 月亚音速飞机尾迹和云效应特别研究 (SUCCESS) 现场实验期间进行了 10 个飞行日的比较，其中包括各种单层和多层云条件。总体而言，在 32% 和 64% 的情况下，CO2 切片方法将云高度检索到激光雷达高度的 6500 m 以内和 61500 m 以内。通过对云高度误差作为 CO2 切片算法中各种误差源的函数的模拟，得出的结论是，多层云的问题次要于正确规范晴空辐射率的问题。
Data from two instruments onboard the National Aeronautics and Space Administration (NASA) ER-2 high-altitude aircraft have been utilized in the largest validation study to date in assessing the accuracy of the CO2-slicing cloud height algorithm. Infrared measurements of upwelling radiance from the MODIS (Moderate- Resolution Imaging Spectroradiometer) airborne simulator (MAS) were used to generate cloud top heights and then compared to those derived from the Cloud Lidar System (CLS), operating with dual polarization at 0.532 mm. The comparisons were performed for 10 flight days during the Subsonic Aircraft Contrail and Cloud Effects Special Study (SUCCESS) field experiment during April and May 1996 which included various single- layer and multilayer cloud conditions. Overall, the CO2-slicing method retrieved cloud heights to within 6500 m and to within 61500 m of the lidar heights in 32 and 64% of the cases, respectively. From a simulation of cloud height errors as a function of various error sources in the CO2-slicing algorithm, it was concluded that the problem of multilayer clouds is secondary to that of proper specification of clear-sky radiances.