Ice Cloud Optical Thickness, Effective Radius, And Ice Water Path Inferred From Fused MISR and MODIS Measurements Based on a Pixel-Level Optimal Ice Particle Roughness Model

被引:11
|
作者
Wang, Yi [1 ]
Yang, Ping [1 ]
Hioki, Souichiro [1 ]
King, Michael D. [1 ,2 ]
Baum, Bryan A. [3 ]
Di Girolamo, Larry [4 ]
Fu, Dongwei [4 ]
机构
[1] Texas A&M Univ, Dept Atmospher Sci, College Stn, TX 77843 USA
[2] Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO USA
[3] Sci & Technol Corp, Madison, WI USA
[4] Univ Illinois, Dept Atmospher Sci, Urbana, IL USA
关键词
ice clouds; MISR; MODIS; optical thickness; effective radius; ice particle model; RADIATIVE PROPERTIES; SURFACE-ROUGHNESS; LIGHT-SCATTERING; CIRRUS CLOUDS; MICROPHYSICS; SENSITIVITY; RETRIEVALS; INSTRUMENT; PRODUCTS; CRYSTALS;
D O I
10.1029/2019JD030457
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The Multi-angle Imaging SpectroRadiometer (MISR) provides measurements over a wider scattering-angle range for a given location than a cross-track scanning sensor such as the MODerate resolution Imaging Spectroradiometer (MODIS). Based on a full year (2013) of fused MISR-MODIS datasets, we develop a variable surface roughness model for ice particles with the goal of identifying the optimal degree of roughness in the ice model for a given pixel containing single-layer ice clouds. For the MISR-MODIS observations over oceans, severe roughness values are often selected for a pixel when optical thickness (tau) and particle effective radius (R-eff) are large in conjunction with larger cloud heterogeneity index (H-sigma) or a warmer cloud top temperature. Furthermore, tau, R-eff, and ice water path are retrieved with the optimal model and compared to operational MODIS Collection 6 (MC6) products that assume a constant roughness. In general, the retrievals based on the present optimal model lead to greater consistency with MISR measurements, and result in larger median tau by 10.1% and smaller median R-eff by 6.5% but almost identical ice water path in comparison with the MC6 counterparts. The higher average tau value is caused by a slightly larger number of large tau cases, but the smaller average R-eff value is due to the shifting of the retrieved R-eff value toward smaller values by approximately 2-4 mu m in comparison to the MC6 distribution over all seasons. Both tau retrievals have similar regional and monthly variations, but a larger annual cycle of R-eff is associated with the optimal model.
引用
收藏
页码:12126 / 12140
页数:15
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