LMWG progress towards CLM4 – Soil hydrology • CLM3.5 major improvement over CLM3 (partitioning of ET into transpiration, soil evap, canopy evap; seasonal soil water storage) • … but solutions created root zone soil moisture variability problem – Snow model • snow cover fraction, snow burial fraction, snow compaction, SNICAR: snow age and albedo, vertically resolved heating, aerosol deposition – Urban model • simulate urban heat island – Integration of CLM-CN with CLM-DGVM, land use carbon fluxes • allows full participation in AR5, shrub vegetation type added – Organic soil – Deep soil column (15 level, 50m) • longer spinup time, soil can and does accumulate more heat – Fine mesh – high resolution land and downscaling – Greenland Ice sheet model • CLM physics changes mostly complete, coupling between CLM and GLIMMER ongoing
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LMWG progress towards CLM4 –Soil hydrology CLM3.5 major improvement over CLM3 (partitioning of ET into transpiration, soil evap, canopy evap; seasonal.
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LMWG progress towards CLM4
– Soil hydrology• CLM3.5 major improvement over CLM3 (partitioning of ET into
transpiration, soil evap, canopy evap; seasonal soil water storage)• … but solutions created root zone soil moisture variability problem
SNICAR: snow age and albedo, vertically resolved heating, aerosol deposition
– Urban model • simulate urban heat island
– Integration of CLM-CN with CLM-DGVM, land use carbon fluxes• allows full participation in AR5, shrub vegetation type added
– Organic soil– Deep soil column (15 level, 50m)
• longer spinup time, soil can and does accumulate more heat– Fine mesh – high resolution land and downscaling– Greenland Ice sheet model
• CLM physics changes mostly complete, coupling between CLM and GLIMMER ongoing
Urbanizing CLM
Gridcell
Glacier Wetland Lake
Landunits
Vegetated
PerviousShaded Wall
Roof Sunlit Wall
Impervious
Urban
Canyon Floor
Industrial
High Density
Suburban
Urban Heat Island as a function of H/W, meteorological conditions, rural environment
•Heat island increases with increasing height to width ratio
•Daily min temperatures increase more than daily max temperatures resulting in reduced diurnal temperature range
•The magnitude of the heat island varies tremendously (dots) depending on prevailing meteorological conditions and characteristics of surrounding rural environments
•These are known features of the urban environment that are captured by the model
LMWG progress towards CLM4
– Soil hydrology• CLM3.5 major improvement over CLM3 (partitioning of ET into
transpiration, soil evap, canopy evap; seasonal soil water storage)• … but solutions created root zone soil moisture variability problem