1. Mire parameterization
COSMO Priority Task
Mire parameterization
Alla Yurova (Hydrometcentre of Russia)
Gerd Vogel (DWD)

2. Task aim:
to incorporate a mire parameterization into the TERRA land surface scheme
to investigate the influence of mire parameterization on the components of the heat and water balance simulated by TERRA and compare them with available observations

3. Results of the preliminary tests with the mire parameterization in the COSMO model
Modifications: mire evapotranspiration as a function of PET for a climatic average position of the mire water table depth
2m temperature difference between the modified (with the mire parameterization) and the standard COSMO model. 36h forecast, starting at 00 UTC, 10 August 2011, COSMO-RU domain

4. 2m temperature difference between the modified (with the mire parameterization) and the standard COSMO model. 36h forecast, starting at 00 UTC, 10 August 2011, COSMO-RU domain, Western Siberia

5. 2m temperature difference between the modified (with the mire parameterization) and the standard COSMO model. 72h forecast, starting at 00 UTC, 10 August 2011, single point in Western Siberia (70o E, 62o N)

6. More latent heat is released from the mires into the atmosphere
Difference in the surface latent heat flux (W/m2) between the modified (with the mire parameterization) and the standard COSMO model. 36h forecast, starting at 00 UTC, 10 August 2011, COSMO-RU domain , Western Siberia

7. …As a result a cloud cover (low level) is increased
black-with mire parameterization
green- standard
The cloud cover (low level) simulated by the modified (with the mire parameterization) and the standard COSMO model. 72h forecast, starting at 00 UTC, 10 August 2011, single point in Western Siberia (70o E, 62o N)

8. …Due to intensified convection
black-with mire parameterization
green- standard
CAPE (J/kg) simulated by the modified (with the mire parameterization) and the standard COSMO model. 72h forecast, starting at 00 UTC, 10 August 2011, single point in Western Siberia (70o E, 62o N)

9. Conclusion: COSMO model is sensitive to the
Also modified are:
Solar and thermal net radiation at the surface
Boundary layer depth
Precipitation
Surface wind field (slightly)
...
Conclusion: COSMO model is sensitive to the
additional moisture source introduced by
the mire parameterization

10. Planned sub-tasks:
Compilation of a database of the mire distribution on a 1km grid in TERRA-compatible format based on satellite vegetation classification (GEM, Bartalev ) and national peat surveys (Vompersky et al. )
Consistency check with TERRA soiltype 8
(peat) from FAO

11. Planned sub-tasks:
2. Prescription of peat thermal properties in TERRA with dependencies of thermal conductivity on soil water (ice) content using the organic soil thermal conductivity database

12. Planned sub-tasks:
3a. MMWH model programmed as subroutine ready to use in TERRA and documented.

13. The Mixed Mire Water and Heat model MMWH (Granberg et al., 1999)
zwt
zcat
W=P-E-q,
q=lq·i·K_h(zcat-zwt),
W-water content, P-precipitation, E-evapotranspiration, q-runoff, i-slope of the water table,·K_h-transmissivity coefficient, lq-lumped parameter

14. Planned sub-tasks:
3b. TERRA standard soil water transfer code based on Richards equation with an exchange with groundwater at the lower boundary applied and tested for the mire sites.

15. Planned sub-tasks:
4. Quantitative estimates of the mire parameterization performance in stand-alone TERRA tests for selected mire sites
Degero Stormyr, Nothern Sweden Lammin Suo, North European Russia
Vasyugan bog, Siberia? Abisko, N. Sweden? Finnish mires? (Euroflux network)

16. Planned sub-tasks:
5a. Integration of the mire parameterization in a fully coupled COSMO model for the COSMO-RU domain .
5b. Investigation of the fully coupled COSMO model performance with the mire parameterization for various seasons.