Airborne Measurements of Areal Spectral Surface Albedo over Different Sea and Land Surfaces
Author
Wendisch, Manfred
Pilewskie, Peter
Jakel, Evelyn
Schmidt, Sebastian
Pommier, John
Howard, Steve
Jonsson, Haflidi H.
Guan, Hong
Schroder, Marc
Mayer, Bernhard
Date
2005Metadata
Show full item recordAbstract
Airborne measurements of the ratio of spectral upward and downward irradiances
(so-called spectral albedo) are used to derive the areal spectral surface albedo in the
wavelength range from 330 to 1670 nm. The data were collected over different sea and
land surfaces in cloudless atmospheric conditions during three field campaigns.
Measurements from the Albedometer (developed at IfT) and the NASA Solar Spectral
Flux Radiometer (SSFR) are employed. Spectral radiative transfer calculations show that
atmospheric scattering and absorption within the layer beneath the flight level
considerably contribute to the airborne albedo measurements reported here, even for low
flight altitudes (0.2–0.5 km). To remove this atmospheric masking, a nonlinear
extrapolation of the airborne albedo measurements to the ground is performed. The
nonlinearity is due to the vertically inhomogeneous distribution of the particle
microphysical properties. This fact underlines the importance of aerosol profile
measurements for the proper correction of atmospheric masking. Examples of the
extrapolated areal spectral surface albedos are discussed in terms of their solar zenith angle
dependence, their small-scale, and general variability. Finally, typical areal spectral surface
albedos for different sea and land surfaces, as derived from the three measurement
campaigns, are supplied in parameterized form for use in radiative transfer
applications.
Description
Journal of Geophysical Research, Vol. 109 (D08203), 4633
The article of record as published may be located at http://dx.doi.org/ 10.1029/2003JD004392.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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