HR: 0800h
AN: A41B-0431    [Abstracts]
TI: ABI Solar Channel Bidirectional Reflectance Simulation
AU: * Ding, S
EM: dingsg@ariel.met.tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843,
AU: Yang, P
EM: pyang@ariel.met.tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843,
AU: Heidinger, A
EM: Heidinger@noaa.gov
AF: Office of Research and Applications, NOAA/NESDIS, Office of Research and Applications, NOAA/NESDIS, Madison, WI 53706,
AU: Pavolonis, M
EM: Pavolonis@noaa.gov
AF: Office of Research and Applications, NOAA/NESDIS, Office of Research and Applications, NOAA/NESDIS, Madison, WI 53706,
AU: Baum, B
EM: bryan.baum@ssec.wisc.edu
AF: Space Science and Engineering Center, University of Wisconsin-Madison, Space Science and Engineering Center, University of Wisconsin-Madison, Madison, WI 53706,
AU: Huang, H A
EM: allen.huang@ssec.wisc.edu
AF: Space Science and Engineering Center, University of Wisconsin-Madison, Space Science and Engineering Center, University of Wisconsin-Madison, Madison, WI 53706,
AB: The objective of this study is to develop an ABI simulator (specifically, a fast radiative transfer model for single- layer clouds). The first step of this effort is to develop the lookup tables of the bidirectional reflectance of ice clouds at corresponding ABI channels. To develop the ice cloud bidirectional reflectance lookup tables, we first recomputed the shortwave single- scattering properties of ice crystals with geometries of droxtals, hexagonal plates, hollow columns, solid columns, 3D bullet rosettes and aggregates. The single-scattering properties were computed for 45 size bins ranging from 2 to 9500 ?m. This scattering database contains the asymmetry factor, single-scattering albedo, extinction cross-section, and scattering phase function. The data of individual ice cloud particle size distributions are derived from five field campaigns: a) FIRE-I; b) FIRE-II; c) ARM-IOP; d) TRMM, and e) CRYSTALFACE. Furthermore, the bulk scattering properties are averaged with a final set of 9 De values ranging from 5 to 200 ?m with an increment of log(De/2)=0.2. Each De model includes the microphysical and scattering properties such as ice water content, extinction efficiency, single-scattering albedo, asymmetry factor and scattering phase function. Integrating the bulk scattering properties with a discrete ordinate radiative transfer model (DISORT), we calculated the lookup tables of the bidirectional reflectance of ice clouds at corresponding ABI channels. Furthermore, we also compared the radiances simulated at the ABI and MODIS channels.
DE: 0319 Cloud optics
DE: 0320 Cloud physics and chemistry
DE: 0321 Cloud/radiation interaction
DE: 1640 Remote sensing (1855)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting