Summary and Recommendations
Contents
Summary and Recommendations¶
The surface roughness and surface heat capacity can likely be improved in
LANDUSE.TBLSurface roughness can be decreased to 0.001 or 0.01. The former is more accurate, but I’m not sure how many orders of magnitude WRF can obtain from
LANDUSE.TBL.Specific heat capacity may be too high, but I’m concerned my calculations could be wrong.
Thermal inertia constant could also likely be improved, but I know my calculations are incorrect.
Other ice and snow sections from LANDUSE.TBL¶
Section |
Season |
Albedo \((\%)\) |
Suface Moisture Availability \((*100\%)\) |
Surface Emissivity \((\%)\) |
Surface Roughness |
Thermal Inertia Constant |
Snow Cover Effect |
Surface Heat Capacity \((J/(m^{3} K))\) |
Category |
|---|---|---|---|---|---|---|---|---|---|
OLD |
Summer |
55. |
.95 |
.95 |
5. |
5. |
0. |
9.0e25 |
Permanent Ice |
OLD |
Winter |
70. |
.95 |
.95 |
5. |
5. |
0. |
9.0e25 |
Permanent Ice |
USGS |
Summer |
55. |
.95 |
.95 |
0.1 |
5. |
0. |
9.0e25 |
Snow or Ice |
USGS |
Winter |
70. |
.95 |
.95 |
0.1 |
5. |
0. |
9.0e25 |
Snow or Ice |
MODIFIED_IGBP |
Summer |
55. |
.95 |
.95 |
0.1 |
5. |
0 |
9.0e25 |
Snow or Ice |
MODIFIED_IGBP |
Winter |
70. |
.95 |
.95 |
0.1 |
5. |
0 |
9.0e25 |
Snow or Ice |
SiB |
Summer |
55. |
.95 |
.95 |
5. |
5. |
0. |
9.0e25 |
Ice Cap and Glacier |
SiB |
Winter |
70. |
.95 |
.95 |
5. |
5. |
0. |
9.0e25 |
Ice Cap and Glacier |
LW12 |
All |
70. |
.95 |
.95 |
5. |
5. |
0. |
9.0e25 |
Snow and Ice |
MODIS |
Summer |
55. |
.95 |
.95 |
1. |
5. |
0. |
9.0e25 |
Snow and Ice |
MODIS |
Winter |
55. |
.95 |
.98 |
1.0 |
5. |
0. |
9.0e25 |
Snow and Ice |
SSIB |
Summer |
55. |
.95 |
.95 |
0.1 |
5. |
0. |
9.0e25 |
Snow or Ice |
SSIB |
Winter |
70. |
.95 |
.95 |
0.1 |
5. |
0. |
9.0e25 |
Snow or Ice |
NLCD40 |
Summer |
60. |
.95 |
.95 |
1.2 |
5. |
0. |
9.0e25 |
Permanent Snow and Ice |
NLCD40 |
Winter |
60. |
.95 |
.95 |
1.2 |
5. |
0. |
9.0e25 |
Permanent Snow and Ice |
Albedos overall are lower than those observed at N-ICE
Soil moisture availability is 0.95 in all the simulations
Emissivity is higher in some situations, N-ICE simulations could potentially benefit from using the 0.98 instead of 0.95
Surface roughness is the lowest in the section used, but it is still higher than that calculated fro N-ICE
Thermal interia constant, snow cover effects, and the surface heat capacity are the same in all simualtions
If my calculations of the surface heat capacity are correct, simulations could likely be improved by lowering this value.
Values in VEGPARM.TBL¶
** Not used in the idealized simulations **
Section |
Vegetation Fraction |
Rooting Depth |
Stomatal Resistance |
Radiation Stress |
Vapor Pressure Deficit Function Parameter |
Soil Water Equivalent Snow Depth |
Maximum Albedo Over Deep Snow |
Minimum LAI |
Maximum LAI |
Minimum Emissivity |
Maximum Emissivity |
Minimum Albedo |
Maximum Albedo |
Minimum Roughness Length |
Maximum Roughness Length |
Category |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
USGS |
0 |
1 |
999 |
999 |
999 |
0.02 |
82 |
0.01 |
0.01 |
0.95 |
0.95 |
0.55 |
0.70 |
0.001 |
0.001 |
Snow or Ice |
MODIFIED_IGBP |
0 |
1 |
999 |
999 |
999 |
0.02 |
82 |
0.01 |
0.01 |
0.95 |
0.95 |
.55 |
.7 |
0.001 |
0.001 |
Snow and Ice |
NLDC |
0 |
1 |
999 |
999 |
999 |
0.02 |
82 |
0.01 |
0.01 |
0.95 |
0.95 |
0.55 |
0.70 |
0.001 |
0.001 |
Permanent Snow |
NLDC |
0 |
1 |
999 |
999 |
999 |
0.02 |
82 |
0.01 |
0.01 |
0.95 |
0.95 |
0.55 |
0.70 |
0.001 |
0.001 |
Perennial Ice/Snow |
Section |
Albedo |
Roughness Length |
LEMI* |
PC* |
Vegetation Factor |
IFOR* |
Stomatal Resistance |
Radiation Stress |
Vapor Pressure Deficit Function Parameter |
Soil Water Equivalent Snow Depth |
LAI |
Maximum Albedo |
Category |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
USGS-RUC |
0.55 |
0.0024 |
0.98 |
0.00 |
0.00 |
9 |
999. |
999. |
999. |
0.02 |
0.01 |
75 |
Snow or Ice |
MODIS-RUC |
0.55 |
0.011 |
0.98 |
0.00 |
0.00 |
9 |
999. |
999. |
999. |
0.02 |
0.01 |
82 |
Snow and Ice |
* I Don’t know what some of these are
The maximum albedo is higher here than in
LANDUSE.TBL, closer to that seen at N-ICE and the value used in the simulations.Roughness lengths are closer to what I’ve calculated for N-ICE
Emissivities are similar to those seen in
LANDUSE.TBL
Values in SOILPARM.TBL¶
** Not used in the idealized simulation, for land-ice **
Section |
B Parameter |
Dry Soil Moisture Threshold |
Soil Thermal Diffusivity/Conducticity Coefficient |
Saturation Soil Moisture Content |
Reference Soil Moisture |
Saturation Soil Matric Potential |
Saturation Soil Conductivity |
Saturation Soil Diffusivity |
Wilting Point Soil Moisture |
Soil Quartz Content |
|---|---|---|---|---|---|---|---|---|---|---|
STAS |
4.26 |
0.028 |
-1.044 |
0.421 |
0.283 |
0.036 |
1.41E-5 |
0.514E-5 |
0.028 |
0.25 |
STAS-RUC |
4.90 |
0.065 |
2.10 |
0.435 |
0.249 |
0.218 |
3.47E-5 |
0.514E-5 |
0.114 |
0.05 |
None of these should impact the ice surface
What do I recommend?¶
Section |
Season |
Albedo \((\%)\) |
Surface Moisture Availability \((*100\%)\) |
Surface Emissivity \((\%)\) |
Surface Roughness |
Thermal Inertia Constant |
Snow Cover Effect |
Surface Heat Capacity \((J/(m^{3} K))\) |
|---|---|---|---|---|---|---|---|---|
NICE |
Winter |
86. |
.95 |
.98 |
0.001 |
5. |
0. |
1.8e06 |
NICE |
Summer |
81. |
.95 |
.98 |
0.001 |
5. |
0. |
1.8e06 |
Increase albedo in both the winter and summer
Increase surface emissivity from 0.95 to 0.98
Decrease surface roughness from 0.1 to 0.001
Decreased surface heat capacity and use a different value for winter and summer.