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)