To improve the snow albedo parameterizations in E3SM land model
a. Non-spherical snow shape
b. Internal mixing of black carbon (BC) and snow
c. Internal mixing of dust and snow
d. SZA dependence of solar irradiance
Reference: SNICAR_AD v3: https://gmd.copernicus.org/preprints/gmd-2021-182/; https://github.com/mflanner/SNICARv3