Auxiliary material for Paper [paper number] Spectral Bidirectional Reflectance of Antarctic Snow: Measurements and Parameterization Stephen R. Hudson, Stephen G. Warren, Richard E. Brandt, and Thomas C. Grenfell Department of Atmospheric Sciences, University of Washington, Seattle, Washington, USA [Journal Reference, exactly following journal article, including DOI (10.1029/).] The supplementary material for this paper consists of 8 ASCII tables. Two of these tables, albedo.txt and brdf.txt, contain data collected at Dome C station on the East Antarctic Plateau during the austral summers of 2003-2004 and 2004-2005. The other tables contain the empirical orthogonal functions (EOFs) used in the parameterization described in this paper. The necessary EOFs for each parameterization are presented in a separate table. A description of each file follows. ---- albedo.txt This table contains values of the albedo of the snow at Dome C, which are used in the parameterizations for wavelengths longer than 950 nm, and are plotted in Figure 6. These values were determined by first averaging five albedo measurements, then performing an 11-nanometer running mean on the values at wavelengths of 1825 nm or less, and a 101-nanometer running mean on the values at longer wavelengths. Each of the five individual albedo measurements was made over undisturbed, clean snow at the edge of our BRDF measurement field of view between 2300 and 2330 LST on 30 December 2004, a period when the solar disk was completely obscured by overcast. The measurements were made with the ASD instrument described in section 3.2, with the input fiber optic receiving light reflected from a Spectralon plate which was leveled, first facing up, then down. There are two columns: wavelength: Wavelength in nanometers, a three- or four-digit integer albedo: The albedo at the wavelength in column 1, a floating point number formatted as F6.4 (0.####) ---- brdf.txt This table contains the anisotropic reflectance factor (R) of the snow at Dome C, as described in the paper. The data are presented for wavelengths from 350 to 2400 nm at 25-nanometer intervals, at each solar zenith angle observed. For each combination of wavelength and solar zenith angle, the value of R is given first for a viewing zenith angle 7.5 degrees, relative azimuth angle 0 degrees (7.5,0). Only the one value at 7.5 degrees is given because no measurements were made at 7.5 degrees, and R at all azimuths at this viewing zenith angle were assumed to be equal to the median of all observations at viewing zenith angle 22.5 degrees). Following the (7.5,0) entry, the values of R for relative azimuths 0 to 180 degrees, in 15-degree intervals are given, first for viewing zenith 22.5 degrees, then 37.5, 52.5, 67.5, and 82.5 degrees. R is assumed symmetric across the principal plane. All of the data in this table at wavelengths with albedo greater than 0.15 were used in the development of the parameterization except those at wavelengths of 1450 nm and higher with viewing zenith angles larger than 52.5 degrees and all those at wavelength 1425 nm. There are five columns: wl: Wavelength in nanometers, a three- or four-digit integer sza: Solar zenith angle in degrees at the time of the observation, a floating point number formatted at F5.2 (##.##) vza: Viewing zenith angle in degrees, a floating point number formatted as F4.1 az: Relative azimuth angle in degrees (measured clockwise from the solar azimuth to the viewing azimuth), a one- to three-digit integer R: The anisotropic reflectance factor corresponding to the parameters in the first four columns, a floating point number formatted as F6.3 ---- eof_A.txt This table contains the first and second EOFs (the data in the first and second columns of U in Equation 6) for parameterization A (see Table 1 in the paper). There are four columns: vza: Viewing zenith angle in degrees, a floating point number formatted as F4.1 az: Relative azimuth angle in degrees (measured clockwise from the solar azimuth to the viewing azimuth), a floating point number formatted as F5.1 EOF1: The value of the first EOF at that combination of viewing angles, a floating point number formatted as F7.4 EOF2: The values of the second EOF at that combination of viewing angles, a floating point number formatted as F7.4 ---- eof_B.txt This table contains the first and second EOFs (the data in the first and second columns of U in Equation 6) for parameterization B (see Table 1 in the paper). There are four columns: vza: Viewing zenith angle in degrees, a floating point number formatted as F4.1 az: Relative azimuth angle in degrees (measured clockwise from the solar azimuth to the viewing azimuth), a floating point number formatted as F5.1 EOF1: The value of the first EOF at that combination of viewing angles, a floating point number formatted as F7.4 EOF2: The values of the second EOF at that combination of viewing angles, a floating point number formatted as F7.4 ---- eof_C.txt This table contains the first and second EOFs (the data in the first and second columns of U in Equation 6) for parameterization C (see Table 1 in the paper). There are four columns: vza: Viewing zenith angle in degrees, a floating point number formatted as F4.1 az: Relative azimuth angle in degrees (measured clockwise from the solar azimuth to the viewing azimuth), a floating point number formatted as F5.1 EOF1: The value of the first EOF at that combination of viewing angles, a floating point number formatted as F7.4 EOF2: The values of the second EOF at that combination of viewing angles, a floating point number formatted as F7.4 ---- eof_D.txt This table contains the first, second, and third EOFs (the data in the first, second, and third columns of U in Equation 6) for parameterization D (see Table 1 in the paper). There are five columns: vza: Viewing zenith angle in degrees, a floating point number formatted as F4.1 az: Relative azimuth angle in degrees (measured clockwise from the solar azimuth to the viewing azimuth), a floating point number formatted as F5.1 EOF1: The value of the first EOF at that combination of viewing angles, a floating point number formatted as F7.4 EOF2: The values of the second EOF at that combination of viewing angles, a floating point number formatted as F7.4 EOF3: The values of the third EOF at that combination of viewing angles, a floating point number formatted as F7.4 ---- eof_E.txt This table contains the first EOFs (the data in the first column of U in Equation 6) for parameterization E (see Table 1 in the paper). There are three columns: vza: Viewing zenith angle in degrees, a floating point number formatted as F4.1 az: Relative azimuth angle in degrees (measured clockwise from the solar azimuth to the viewing azimuth), a floating point number formatted as F5.1 EOF1: The value of the first EOF at that combination of viewing angles, a floating point number formatted as F7.4 ---- eof_F.txt This table contains the first and second EOFs (the data in the first and second columns of U in Equation 6) for parameterization F (see Table 1 in the paper). There are four columns: vza: Viewing zenith angle in degrees, a floating point number formatted as F4.1 az: Relative azimuth angle in degrees (measured clockwise from the solar azimuth to the viewing azimuth), a floating point number formatted as F5.1 EOF1: The value of the first EOF at that combination of viewing angles, a floating point number formatted as F7.4 EOF2: The values of the second EOF at that combination of viewing angles, a floating point number formatted as F7.4