Module smb_oggm
Module smb_oggm
implements the monthly temperature index model calibrated on geodetic mass balance (MB) data (Hugonnet, 2021) by OGGM. The yearly surface mass balance is computed with:
where \(P_i^{sol}\) is the monthly solid precipitation, \(T_i\) is the monthly temperature, and \(T_{melt}\) is the air temperature above which ice melt is assumed to occur (parameter temp_melt
). The parameter \(d_f\) is the melt factor (parameter melt_f
), and \(\frac{\rho_w}{\rho_i}\) is the ratio of water to ice density. Solid precipitation \(P_i^{sol}\) is computed from precipitation and temperature such that it equals precipitation when the temperature is lower than a certain threshold (parameter temp_all_solid
), zero above another threshold (parameter temp_all_liq
), with a linear transition between the two. Module oggm_shop
provides all calibrated parameters [1].
Contributors: Guillaume Jouvet, Fabien Maussion
Reference: Maussion, Fabien, et al. "The open global glacier model (OGGM) v1. 1." Geoscientific Model Development 12.3 (2019): 909-931.
Config Structure
Parameters
Name | Type | Units | Description | Default Value |
---|---|---|---|---|
update_freq | float | y | Update the mass balance each X years | 1 |
ice_density | float | kg m^{-3} | Density of ice for conversion of SMB into ice equivalent | 910.0 |
wat_density | float | kg m^{-3} | Density of water | 1000.0 |
melt_enhancer | float | dimless | Melt enhancer factor | 1 |