modules_Qmelt2 (03/21/16)

CRHM Borland

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Qmelt2

This module defined in Classqmelt to calculate the ground flux for hummuck-covered hillslopes in the Artic tundra. CRHM compatible.

Observations

  • none

Variables

  • Qm (MJ/m2 Dt) - snow melt during the time step, calculated  using the mean daily air temperature.
  • cum_Qm (MJ/m2 Dt) - cumulative snow melt (from daily mean air temperature) over time.
  • Qg (MJ/m2) -ground heat flux during the time step, calculated using the mean daily surface/skin temperature.
  • cum_Qg (MJ/m2) - cumulative ground heat flux (from daily mean surface/skin temperature) over time.

Parameters

  • TIa0Mn (°C) - offset in temperature - index model in calculating QmD.
  • TIa1Mn (MJ/day/°C) - coefficient for estimating QmD.
  • TIs0Mn (°C) - offset in temperature - index model in calculating QgD.
  • TIs1Mn (MJ/day/°C) - coefficient for estimating QgD.

Variable Inputs

  • hru_t (°C) - air temperature.
  • hru_tmean (°C) - mean air temperature.
  • hru_tsfD (°C) - daily mean surface/skin temperature.

Notes

Snow melt from mean daily air temperature .

  1. if (tmean - TIa0Mn > 0.0) QmD = (tmean - TIa0Mn)*TIa1Mn,
  2. if time step t > 0.0 Qm = t*QmD/tpos else Qm = 0.0.
  3. cum_Qm = cum_Qm + Qm.

 

Ground heat flux from mean daily surface/skin temperature

  1. if (tsmean - TIs0Mn > 0.0) QgD = (tsmean - TIs0Mn)*TIs1Mn,
  2. if time step ts > 0.0 Qg = ts*QgD/tspos else Qg = 0.0.
  3. cum_Qg = cum_Qg + Qg.
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