HR: 0830h
AN: A11E-0017    [PDF]
TI: Comparisons of Sunphotometer-derived Optical Depths and Surface Radiation Measurements and their Effects on the Aerosol Surface Forcing Estimation
AU: Jefferson, A
EM: anne.jefferson@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80305 United States
AU: * Kim, S
EM: sang-woo.kim@noaa.gov
AF: Seoul National University, Seoul, Korea, Seoul, 151-747 Korea, Republic of
AU: Yoon, S
AF: Seoul National University, Seoul, Korea, Seoul, 151-747 Korea, Republic of
AU: Dutton, E G
EM: ellsworth.g.dutton@noaa.gov
AF: NOAA CLimate Monitoring and Diagnostics Lab, 325 Broadway, Boulder, CO 80305 United States
AU: Ogren, J
AF: NOAA CLimate Monitoring and Diagnostics Lab, 325 Broadway, Boulder, CO 80305 United States
AU: Bush, B C
AF: Scripps Institute of Oceanography, University of California, San Diego, La Jolla, CA 92093 United States
AU: Kim, J
AF: KMA, Meteorological Research Institute, Applied Meteorology Lab, Seoul, 151-747 Korea, Republic of
AU: Holben, B N
AF: NASA Goddard Space Flight Center, Code 923, Greenbelt, MD 92093 United States
AB: To quantify and understand the uncertainties of current estimates of aerosol climate radiative forcing, aerosol optical and radiative properties relevant to the computation of direct radiative forcing were measured at Gosan surface site in South Korea during the Aerosol Characterization Experiment in Asia (ACE-Asia) in the April of 2001. This study will investigate the performance of current radiometric measurements and its impact on the aerosol surface forcing estimation. The instantaneous aerosol direct radiative forcing (ADRF) by atmospheric aerosols can be estimated using column aerosol optical depth ( ) and surface solar irradiance (SSI) measurements. Uncertainties in and SSI measurements determine the accuracy of the ADRF and aerosol surface forcing efficiency ( sfc, Wm-2/ ). To assess and understand the effects of the inherent uncertainties of radiometric measurements on ADRF and sfc, we will present the comparisons of independent measurements of 500 and SSI by three different types of sunphotometers and sets of radiometers. We will present calculations of the ADRF and sfc using two analytical methods, a direct calculation using measurement data and a hybrid approach which uses both model and measurement data. The variances of ADRF and sfc, derived from combinations of and SSI data, will also be presented. These comparisons highlight the importance of radiation measurements in obtaining more accurate assessments of aerosol radiative forcing.
UR: http://www.cmdl.noaa.gov
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0342 Middle atmosphere--energy deposition
DE: 0360 Transmission and scattering of radiation
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting