Journal of Geophysical Research Space Physics
Supporting Information for
Parameterizations for narrowband and broadband albedo
of pure snow, and snow containing mineral dust and black carbon
Cheng Dang1, Richard E. Brandt2 and Stephen G. Warren1
1Department
of Atmospheric Sciences, University of Washington, Seattle,
WA 98195-1640, USA
2Atmospheric
Sciences Research Center, University at Albany - State University of New York,
Whiteface Mountain Field Station, Wilmington, NY 12997, USA
Content of this file
Figure S1-S5
Figure S1. Single-scattering quantities for pure snow: (a) Extinction efficiency Qext;
(b) single-scattering coalbedo 1-  ; (c) asymmetry parameter g;
Figure S2. Errors in broadband albedo reduction induced by using BC-snow albedo
reduction parameterization suggested in Section 5.2. The dashed curves, solid
curves, and asterisks show errors of albedo reduction in three different ranges of BC
mass fraction listed in Table 1. Different colors are different snow grain radius
ranges from 5 – 2500 μm as indicated in the right bottom corner.
Figure S3. Evaluation of albedo reduction calculated using BC equivalent factor f
(snow containing only dust).
Top panels: the solid curves are broadband (all wave and visible) albedo reduction
calculated using DISORT for different snow grain radius and dust mass fraction; the
dots are broadband albedo reduction calculated using parameterization of BC-snow
albedo reduction suggested in Section 5.2 and corresponding BC equivalent mass
fraction for given dust mass fraction. Bottom panels: absolute error of broadband
albedo reduction induced by using parameterization and BC equivalent mass
fraction.
Figure S4. Evaluation of albedo reduction calculated using BC equivalent factor f
(snow containing both BC and dust, allwave band, snow grain radius r = 100 μm and
1000 μm).
Top panels: the solid curves are allwave-broadband albedo reduction calculated
using DISORT for different snow grain radius and mixture of BC and dust mass
fractions; the dots are broadband albedo reduction calculated using
parameterization of BC albedo reduction suggested in Section 5.2 and
corresponding BC equivalent mass fraction for given amount of dust and BC
mixture. Bottom panels: absolute error of broadband albedo reduction calculated
using parameterization and BC equivalent mass fraction.
Figure S5. Evaluation of albedo reduction calculated using BC equivalent factor f
(snow containing both BC and dust, visible, snow grain radius r = 100 μm and 1000
μm).
Top panels: the solid curves are visible-broadband albedo reduction calculated
using DISORT for different snow grain radius and mixture of BC and dust mass
fractions; the dots are broadband albedo reduction calculated using
parameterization of BC albedo reduction suggested in Section 5.2 and
corresponding BC equivalent mass fraction for given amount of dust and BC
mixture. Bottom panels: absolute error of broadband albedo reduction calculated
using parameterization and BC equivalent mass fraction.