Reducing Canada's vulnerability to climate change - ESS Variation of land surface albedo and its simulation Shusen Wang Andrew Davidson Canada Centre for.

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Presentation transcript:

Reducing Canada's vulnerability to climate change - ESS Variation of land surface albedo and its simulation Shusen Wang Andrew Davidson Canada Centre for Remote Sensing Reducing Canada's vulnerability to climate change Earth Sciences Sector Acknowledgment: CCAF, PFRA, BOREAS

Reducing Canada's vulnerability to climate change - ESS Albedo and climate  control surface radiation and energy balances  affects boundary-layer structure and dynamics  e.g., albedo changes from forestation in temperate and boreal forest could offset C sequestration (A. Betts, 2000) Albedo and ecosystem  control microclimate conditions  affects biogeochemical cycles

Reducing Canada's vulnerability to climate change - ESS Variations of albedo due to different vegetation types snow covering solar zenith angle …and climate/weather impact plant development/phenology surface heterogeneity

Reducing Canada's vulnerability to climate change - ESS Precipitation in 2001 and 2003

Reducing Canada's vulnerability to climate change - ESS

Drought impact Chapin et al. (1999): net climate-forcing due to about 5% difference in albedo between forest tundra and shrub tundra of northern Alaska are in the order of 5.5 W m -2, which is comparable to the effect of a doubling of global atmospheric CO 2 concentration (4.4 W m -2, Wuebbles 1995).

Reducing Canada's vulnerability to climate change - ESS Temporal variation

Reducing Canada's vulnerability to climate change - ESS Spatial heterogeneity

Reducing Canada's vulnerability to climate change - ESS Local vs. Regional

Reducing Canada's vulnerability to climate change - ESS The albedo model 1. Based on ecosystem elements  Leaf: ref., abs., trans.  Stem/branch: ref., abs.  Snow: snow age/condition  Soil:texture, moisture 2. Ray tracing scheme for radiation transfer 3. Canopy gap probability

Reducing Canada's vulnerability to climate change - ESS Shortwave albedo (SSA-OA) a: leafless canopy with snow- covered ground b: leafless canopy without snow cover c: leafed canopy during growing season

Reducing Canada's vulnerability to climate change - ESS Reflected Radiation

Reducing Canada's vulnerability to climate change - ESS Direct vs. diffuse, visible vs. NIR

Reducing Canada's vulnerability to climate change - ESS Surface albedo and ecosystem conditions a: stand density b: leaf angular distribution c: leaf and wood area indices d: leaf reflectance e: tree bark reflectance f: soil reflectance

Reducing Canada's vulnerability to climate change - ESS Clumping Index

Reducing Canada's vulnerability to climate change - ESS Net Radiation, Jul. 1998

Reducing Canada's vulnerability to climate change - ESS E cological A ssimilation of L and and C limate O bservations - the EALCO model

Reducing Canada's vulnerability to climate change - ESS Summary Drought, plant development, and spatial heterogeneity may induce significant changes of surface albedo; Radiation transfer model based on ecosystem structure and optical parameters can better represent  dynamics; Albedo from site measurement has limitations in spatial representation. It can be improved by the  model using RS inputs; Dew/frost & snow interception could significantly change . Coupling with EB model is necessary to capture this phenomena; Winter  of high latitude ecosystems is very sensitive to LAI/WAI; Simulation at high spectral resolution can improve ecosystem C simulation.