Independent Evaluation of the Ability of Spaceborne Radar and Lidar to Retrieve the Microphysical and Radiative Properties of Ice Clouds
Independent Evaluation of the Ability of Spaceborne Radar and Lidar to Retrieve the Microphysical and Radiative Properties of Ice Clouds
复制标题
星载雷达和激光雷达反演冰云微物理和辐射特性能力的独立评估
DOI：
10.1175/jtech1837.1
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发表时间：
2006
影响因子：
2.2
通讯作者：
V. P. Baptista
中科院分区：
文献类型：
--
作者：
R. Hogan;D. Donovan;C. Tinel;Malcolm E. Brooks;D. Bouniol;A. Illingworth;J. Pedro;V. P. Baptista
雷达和激光雷达在太空中的结合提供了独特的潜力，可以在全球范围内检索冰水含量和粒径的垂直剖面，最近开发的两种算法声称已经克服了这种方法的主要困难-纠正激光雷达信号的消失。本文对这些算法进行了“盲测试”，使用真实的94 ghz雷达和355 nm激光雷达从飞机测量的尺寸光谱中模拟的后向散射剖面，包括分子散射、多次散射和仪器噪声的影响。对真实的和检索到的微物理剖面进行辐射计算，以估计远程推断辐射通量剖面的准确性。研究发现，可见消光剖面可以独立于大小分布的性质、粒子的习惯、平均消光与后向散射比或仪器校准误差的假设来检索。本地错误在r…
Abstract The combination of radar and lidar in space offers the unique potential to retrieve vertical profiles of ice water content and particle size globally, and two algorithms developed recently claim to have overcome the principal difficulty with this approach—that of correcting the lidar signal for extinction. In this paper “blind tests” of these algorithms are carried out, using realistic 94-GHz radar and 355-nm lidar backscatter profiles simulated from aircraft-measured size spectra, and including the effects of molecular scattering, multiple scattering, and instrument noise. Radiation calculations are performed on the true and retrieved microphysical profiles to estimate the accuracy with which radiative flux profiles could be inferred remotely. It is found that the visible extinction profile can be retrieved independent of assumptions on the nature of the size distribution, the habit of the particles, the mean extinction-to-backscatter ratio, or errors in instrument calibration. Local errors in r...