Base class for a model which computes surface mass flux rate (ice thickness per time) from precipitation and temperature. More...
#include <localMassBalance.hh>
Inheritance diagram for pism::surface::LocalMassBalance:Classes | |
| class | Changes |
| struct | DegreeDayFactors |
| A struct which holds degree day factors. More... | |
Public Member Functions | |
| LocalMassBalance (Config::ConstPtr config, units::System::Ptr system) | |
| virtual | ~LocalMassBalance ()=default |
| std::string | method () const |
| virtual unsigned int | get_timeseries_length (double dt)=0 |
| virtual void | get_PDDs (double dt_series, const std::vector< double > &S, const std::vector< double > &T, std::vector< double > &PDDs)=0 |
| Count positive degree days (PDDs). Returned value in units of K day. More... | |
| virtual void | get_snow_accumulation (const std::vector< double > &T, std::vector< double > &precip_rate)=0 |
| virtual Changes | step (const DegreeDayFactors &ddf, double PDDs, double ice_thickness, double old_firn_depth, double old_snow_depth, double accumulation)=0 |
Protected Attributes | |
| std::string | m_method |
| const Config::ConstPtr | m_config |
| const units::System::Ptr | m_unit_system |
| const double | m_seconds_per_day |
Detailed Description
Base class for a model which computes surface mass flux rate (ice thickness per time) from precipitation and temperature.
This is a process model. At each spatial location, it uses a 1D array, with a time dimension, for the temperature used in melting snow or ice. At each spatial location it assumes the precipitation is time-independent.
This process model does not know its location on the ice sheet, but simply computes the surface mass balance from three quantities:
- the time interval \([t,t+\Delta t]\),
- time series of values of surface temperature at \(N\) equally-spaced times in the time interval
- a scalar precipation rate which is taken to apply in the time interval.
This model also uses degree day factors passed-in in DegreeDayFactors ddf, and the standard deviation pddStdDev. The latter is the standard deviation of the modeled temperature away from the input temperature time series which contains the part of location-dependent temperature cycle on the time interval.
- Note
- Please avoid using
config.get...("...")calls inside those methods of this class which are called inside loops over spatial grids. Doing otherwise increases computational costs. - This base class should be more general. For instance, it could allow as input a time series for precipation rate.
- Please avoid using
Definition at line 54 of file localMassBalance.hh.
The documentation for this class was generated from the following files:
- src/coupler/surface/localMassBalance.hh
- src/coupler/surface/localMassBalance.cc
