long
This module defined in Classlong calculates long-wave radiation. Incoming Longwave radiation to Melting Snow: Observations, Sensitivity and Estimation in Northern Environments (Sicart et al., 2005?).
Observations
- Qsi (W/m^2) - incident short-wave.
Observation Functions
- QsiDtot(W/m^2*d) - daily total (cumulative) of average interval incident short-wave fluxes, Qsi.
observationVariables
- Qli# (W/m^2) - calculated incoming long-wave.
Variables
- tau () - atmospheric transmissivity.
- Long (W/m^2) - calculated incoming long-wave. Same as generated observation.
Parameters
- none.
Variable Inputs
- hru_t (°C) - air temperature.
- hru_ea (kPa) - vapour pressure.
- hru_rh (%) - relative humidity.
- QdroDext (global)(MJ/m^2*d) - daily extraTerrestial direct.
- QdroD (global) (MJ/m^2*d) - daily clear-sky direct.
Notes
tau = QsiDtot*(864000/10E6)/QdroDext.
Qli = 1.24*(e/T)^(1/7) (1 + 0.44*RH - 0.18*tau)sbcT^4 where RH lie in the range of 0 and 1 and T is °K.
The declared observation, Qsi# cannot be used as input as the daily total cannot be calculated. If an attempt is made by the module to use a declared observation it will be automatically converted to the simple observation, i.e. Qsi# converted to Qsi.
History.
March 2008 - temperature, vapour pressure and relative humidity changed from using observations to the HRU variables.