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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 Snow model

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Lmwg progress towards clm4
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 clm41
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
Soil moisture variability

Bondville, IL

1m Soil Moisture

anomaly (mm)

  • 19 Illinois stations, 1981-2004

    • Median σmodel / σobs: 0.44


Soil moisture variability1
Soil moisture variability

Bondville, IL

1m Soil Moisture

anomaly (mm)

  • 19 Illinois stations, 1981-2004

    • Median σmodel / σobs: 0.440.72

  • 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


Land atmosphere coupling strength influence of soil moisture on climate
Land-atmosphere coupling strength:Influence of soil moisture on climate

Globally averaged ∆Ω

Precip

Surface evaporation

Pattern correlation

∆Ω(P) vs ∆Ω(E)


Lmwg progress towards clm42
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
Results from Community Snow Project: Snow Cover Fraction

Control - Obs

Community Snow - Obs

Community Snow - Control

Reduced or Increased Bias

Western Siberia


Results from community snow project surface air temperature ann
Results from Community Snow Project: Surface air temperature (ANN)

Community Snow - Obs

Control - Obs

Reduced or Increased Bias

Community Snow - Control

Western Siberia

Tair(land): RMSE 2.78oC  2.56oC, Bias 0.59oC  0.43oC

Climate sensitivity: +0.2 to +0.3oC


Lmwg progress towards clm43
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
Urbanizing CLM

Gridcell

Industrial

Landunits

Glacier

Wetland

Urban

Lake

Vegetated

High Density

Suburban

Roof

Sunlit Wall

Shaded Wall

Pervious

Impervious

Canyon Floor


Urban heat island as a function of h w meteorological conditions rural environment
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 clm44
LMWG progress towards CLM4 conditions, rural environment

  • 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 clm45
LMWG progress towards CLM4 conditions, rural environment

  • 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 clm46
LMWG progress towards CLM4 conditions, rural environment

  • 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 plots siberia
Annual cycle-depth soil temperature plots conditions, rural environmentSiberia

SOILCARB + DEEP SOIL

Lawrence et al., 2007


Lmwg progress towards clm47
LMWG progress towards CLM4 conditions, rural environment

  • 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 clm48
LMWG progress towards CLM4 conditions, rural environment

  • 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 possible
LMWG progress towards CLM4 conditions, rural environmentPossible

  • 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
SOILCARB – CONTROL (JJA) conditions, rural environment


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