Density

Bulk density of newly fallen snow as a piecewise function of atmospheric temperature, following Anderson (1976) as parameterized in Eq. 5.10 of Oleson et al. (2010, CLM Tech Note Ch. 5). Three regimes: (1) warm snow (T_atm > T_f + 2 K) → rho_sno = 50 + 1.7*17^1.5 (saturated warm-side value); (2) intermediate (T_f - 15 K < T_atm <= T_f + 2 K) → rho_sno = 50 + 1.7*((T_atm - T_f + 15)/1K)^1.5; (3) cold (T_atm <= T_f - 15 K) → rho_sno = 50 (saturated cold-side floor). Migrated from UrbanCanopy.jl@9200edd4 src/hydrology.jl:25 (`SnowDensity` @component). Parameterized as observed-only: T_atm is the input parameter; rho_sno is an algebraic output.