HR: 09:45h
AN: A11B-08    [PDF]
TI: Retrieval of Cirrus Properties from Solar Spectral Irradiance During CRYSTAL-FACE
AU: * Pilewskie, P
EM: Peter.Pilewskie-1@nasa.gov
AF: NASA Ames Research Center, M/S 245-4, Moffett Field, CA 94035 United States
AU: Guan, H
EM: guan@clio.arc.nasa.gov
AF: BAER Institute, 560 Third St. West, Sonoma, CA 95476 United States
AU: Platnick, S
EM: steven.platnick@nasa.gov
AF: NASA Goddard Space Flight Center, Code 913, Greenbelt, MD 20771 United States
AU: Yang, P
EM: pyang@ariel.met.tamu.edu
AF: Texas A&M University, TAMU 3150, College Station, TX 77843 United States
AU: Bergstrom, R
EM: bergstrom@baeri.org
AF: BAER Institute, 560 Third St. West, Sonoma, CA 95476 United States
AU: Wendisch, M
EM: wendisch@tropos.de
AF: Institute for Tropospheric Research, Permoserstr. 15, Leipzig, DEU 04318
AB: We examine spectrally resolved solar irradiance measured from above (NASA ER-2) and below (CIRPAS Twin Otter) tropical anvils during CRYSTAL-FACE in order to derive relationships between the scattered (reflected and transmitted) radiation and cirrus microphysical properties. Retrieved parameters are interpreted with respect to other remote sensing methods and to microphysical quantities obtained in situ. In particular we compare with simultaneous MODIS Airborne Simulator (MAS) and MODIS retrievals, which provide a directional inference of cloud properties, compared to the hemispherically integrated spectral irradiance. For both the spectral irradiance and MAS/MODIS retrievals identical ice crystal single-scattering models (twelve size distributions, four crystal habits) are used. This analysis is useful to determine if a directional bias exists between the directly measured spectral irradiance and the computed irradiance using cloud parameters derived from MAS/MODIS. We also show the relationship between infrared forcing and visible optical thickness for thin cirrus over the CRYSTAL-FACE domain.
DE: 0320 Cloud physics and chemistry
DE: 0360 Transmission and scattering of radiation
DE: 1640 Remote sensing
DE: 3314 Convective processes
DE: 3359 Radiative processes
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting