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Update on Land Model WG activities - CESM

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Update on Land Model WG activities - CESM Powered By Docstoc
					                    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

                                     Bondville, IL
1m Soil Moisture
 anomaly (mm)




• 19 Illinois stations, 1981-2004
            • Median σmodel / σobs: 0.44
                               Soil moisture variability

                                     Bondville, IL
1m Soil Moisture
 anomaly (mm)




• 19 Illinois stations, 1981-2004
            • Median σmodel / σobs: 0.44   0.72

• 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

        Globally averaged ∆Ω
    Precip             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     Western Siberia




Community Snow - Control Reduced or Increased
                         Bias
              Results from Community Snow Project:
                 Surface air temperature (ANN)
 Community Snow - Obs           Control - Obs          Western Siberia




Community Snow - Control   Reduced or Increased Bias




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




                                                                 Industrial
Landunits


            Glacier   Wetland    Urban     Lake    Vegetated
                                                                High Density




                                                                 Suburban

            Roof      Sunlit     Shaded   Pervious Impervious
                      Wall        Wall
                                              Canyon Floor
            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 plots
                Siberia




                      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 CLM4
                         Possible
– 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)

				
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posted:12/30/2012
language:English
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