Regional offline land surface simulations over eastern Canada using CLASS. Diana Verseghy Climate Research Division Environment Canada
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1 Regional offline land surface simulations over eastern Canada using CLASS Diana Verseghy Climate Research Division Environment Canada
2 The Canadian Land Surface Scheme (CLASS) Originally developed for the CGCM; treats fluxes of energy and water at the land surface Thermally separate vegetation canopy, snow cover and three soil layers. Four main vegetation structural types (needleleaf trees, broadleaf trees, crops and grass); parameters are aggregated at each time step to define representative canopy characteristics. Up to four subareas per model grid cell: vegetation, bare soil, snow with vegetation and snow over bare soil. (Verseghy, 2000) One soil type for each grid cell.
3 CLASS enhancements since version 2.7 (last GCM version) Ability to model organic soils New formulations for snow density, interception, sublimation, thermal structure, liquid water Improved vegetation turbulent fluxes, soil evaporation Revised soil thermal conductivity calculations Optional mosaic formulation Option for multiple soil layers at depth
4 Project overview A contribution to the IPY project State and Fate of the Canadian Cryosphere, led by Anne Walker Domain chosen: centred over Quebec (snow course data collected by Hydro-Quebec available from 1965 to 2006) Time interval chosen: one-year spin-up period, June June 1992, six-year modelling period, June 1992 June year overlap with daily SWE reconstruction done by Brown et al. for AMIP-2 (ends 1997) Includes warm El Nino winter of 1997/98 (lowest snow year on record in Quebec)
5 Atmospheric forcing data Derived from ERA-40 reanalyses GEM used as temporal and spatial integrator; resolution increased from 1 degree, six hourly to _ degree, _ hourly (courtesy of R. Brown and students at Ouranos) Saved fields: incoming shortwave and longwave radiation, air temperature, humidity and wind speed, rainfall, snowfall, fractional cloud cover, surface pressure, height of lowest model level
6 Background data 1-km North American land cover and soils dataset, produced by Szeto et al. for MAGS Land cover fields derived from CCRS and USGS datasets Soil fields derived from CANSIS and USGS datasets
7 Land cover 1-km base data Data at model resolution
8 Soil type in layer 3 1-km base data Data at model resolution
9 Soil permeable depth
10 Validation data CANGRD monthly minimum, maximum and mean air temperatures and precipitation (gridded dataset, , produced by EC CRD) NOAA daily satellite-derived snow cover Daily snow depth and SWE reconstruction by Brown et al. (2003) Bimonthly SWE over Quebec from snow course data
11 CANGRD and H-Q station locations CANGRD H-Q
12 Annual average precipitation CANGRD ERA-40 derived
13 Average DJF precipitation CANGRD ERA-40 derived
14 CLASS configurations tested Base run: standard three-level soil configuration, 0.10 m, 0.25 m, 3.75 m Multi-layer run: 38 layers, extended to 10 m depth Free-draining run: soil drains instantaneously to field capacity whenever this value is exceeded (as a first approximation to addressing lateral flow) (Multi-layer run results indistinguishable from those of the base run, at least for this short simulation period.)
15 Annual average maximum SWE Brown et al. Base run Hydro-Quebec Free-draining run
16 Annual average SWE Brown et al. Base run Hydro-Quebec Free-draining run
17 Water added to snow pack by freezing Base run Free-draining run
18 Winter soil temperatures (first layer) Base run Free-draining run
19 Winter soil temperatures (third layer)
20 November fractional snow coverage (NOAA, base run, free-draining run)
21 April fractional snow coverage (NOAA, base run, free-draining run)
22 Mean January screen T (CANGRD, base run, free-draining run)
23 Mean July screen T (CANGRD, base run, free-draining run)
24 Vegetation coverage Fractional coverage Dominant vegetation type
25 Conclusions and further work Need to develop a robust parametrization to address lateral water flow in soils where the lower boundary is bedrock Further investigate the effects of soil hydrology on surface energy and moisture fluxes Introduce a lake fractional area (as a first stab, try NOAA Pathfinder lake surface temperature data) Try tests of different mosaic formulations
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