HR: 1340h
AN: A43D-0130    [Abstracts]
TI: A Multi-Data Comparison of Shortwave Climate Forcing Changes
AU: * Palle, E
EM: epb@bbso.njit.edu
AF: Big Bear Solar observatory, New Jersey Institute of Technology, 40386 north Shore Lane, Big Bear City, CA 92314 United States
AU: Montanes-Rodriguez, P
EM: pmr@bbso.njit.edu
AF: Big Bear Solar observatory, New Jersey Institute of Technology, 40386 north Shore Lane, Big Bear City, CA 92314 United States
AU: Goode, P R
EM: pgoode@bbso.njit.edu
AF: Big Bear Solar observatory, New Jersey Institute of Technology, 40386 north Shore Lane, Big Bear City, CA 92314 United States
AU: Koonin, S E
EM: koonin@caltech.edu
AF: W.K. Kellogg Radiation Laboratory, California Institute of Technology, n/a, Pasadena, CA 91125 United States
AU: Wild, M
EM: martin.wild@env.ethz.ch
AF: Institute for Atmospheric and Climate Science ETH, Swiss Federal Institute of Technology, Winterthurerstrasse 190, Zurich, CH-8057 Switzerland
AU: Casadio, S
EM: Stefano.Casadio@esa.int
AF: Institute for Geophysics, Astrophysics, and Meteorology, n/a, Graz, 546679 Austria
AB: Traditionally the earth's reflectance has been assumed to be roughly constant, but large decadal variability, not reproduced by current climate models, has been reported lately from a variety of sources. We compare here the available datasets related to earth's reflectance, in order to assess the observational constraints on the models. We find a consistent picture among all datasets of an albedo decreased during 1985-2000 between 2-3 and 6-7 W/m2, which is highly climatologically significant. The largest discrepancy among the datasets occurs during 2000-2004, when several sets reveal an increasing trend in the reflectance, while CERES observations show a steady decrease of about 2 W/m2. Additionally, analysis of the recently realeased ISCCP data for 2000-2004 are presented. These later findings show a consistency in long-term trends between earthshine reflectance measurements and the global cloud properties and climate change.
DE: 0321 Cloud/radiation interaction
DE: 0343 Planetary atmospheres (5210, 5405, 5704)
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 3310 Clouds and cloud feedbacks
DE: 3359 Radiative processes
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005