Sa. Christopher et al., Shortwave direct radiative forcing of biomass burning aerosols estimated using VIRS and CERES data, GEOPHYS R L, 27(15), 2000, pp. 2197-2200
Using collocated data from the Visible Infrared Scanner (VIRS) and the Clou
ds and the Earth's Radiant Energy Budget Scanner (CERES) from the Tropical
Rainfall Measuring (TRMM) satellite, observational estimates of the instant
aneous Shortwave Aerosol Radiative Forcing (SWARF) of smoke aerosols at the
top-of-atmosphere (TOA) are obtained for four days in May 1998 during a bi
omass-burning episode in Central America. The detection of smoke aerosols i
s demonstrated using VIRS imagery. Assuming a single scattering albedo (ome
ga(o)) of 0.86 (at 0.63 mu m) that is representative of absorbing aerosols,
smoke optical thickness (tau(0.63)) is retrieved over ocean areas. The ave
rage tau(0.63) for these four days was 1.2 corresponding to a SWARF value o
f -68 Wm(-2) The SWARF changes from -24 to -99 Wm(-2) as tau(0.63) changes
from 0.2 to 2.2. Global observational estimates of biomass burning aerosol
radiative forcing can be obtained by combining data sets from TRMM and Terr
a satellites.