LMWG progress towards CLM4 –Soil hydrology CLM3.5 major improvement over CLM3 (partitioning of ET...
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Transcript of LMWG progress towards CLM4 –Soil hydrology CLM3.5 major improvement over CLM3 (partitioning of ET...
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
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
Soil moisture variability
• 19 Illinois stations, 1981-2004
• Median σmodel / σobs: 0.44
Bondville, IL 1m
Soil
Mois
ture
an
om
aly
(m
m)
Soil moisture variability
• Rooting zone soil moisture variability increased globally
• Appears to alleviate vegetation overproductivity of mid-latitude FLUXNET sites in CN mode?
• Recover seasonal soil moisture stress impact on variability of surface turbulentfluxes
• 19 Illinois stations, 1981-2004
• Median σmodel / σobs: 0.44 0.72
Bondville, IL 1m
Soil
Mois
ture
an
om
aly
(m
m)
Land-atmosphere coupling strength:Influence of soil moisture on climate
Globally averaged ∆ΩPrecip Surface evaporation
Pattern correlation ∆Ω(P) vs ∆Ω(E)
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
Results from Community Snow Project: Snow Cover Fraction
Community Snow - Obs Control - Obs
Community Snow - Control Reduced or Increased Bias
Western Siberia
Results from Community Snow Project: Surface air temperature (ANN)
Community Snow - Obs Control - Obs
Community Snow - Control Reduced or Increased Bias
Western Siberia
Tair(land): RMSE 2.78oC 2.56oC, Bias 0.59oC 0.43oCClimate sensitivity: +0.2 to +0.3oC
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
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
– 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
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
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
Annual cycle-depth soil temperature plotsSiberia
SOILCARB + DEEP SOIL
Lawrence et al., 2007
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
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
LMWG progress towards CLM4Possible
– Prognostic canopy airspace
• improves computational efficiency, storage of heat, moisture, carbon in plant canopy
– Irrigation + global Integrated crop model
• simulate growth, development, and management of crops
– Minor changes
• roughness length sparse/dense canopy; CCSM stability function; reference height
– Dynamic wetlands (lakes)
– Methane wetland emission model
SOILCARB – CONTROL (JJA)