WCRPGEWEX Pathway to LANDFLUX - PowerPoint PPT Presentation
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WCRPGEWEX Pathway to LANDFLUX
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Temperature, Emissivity, Spectral Albedo ... Vegetation Phenology & LAI. Snow Cover & SWE. Soil Moisture (if available) Way forward: ... – PowerPoint PPT presentation
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Title: WCRPGEWEX Pathway to LANDFLUX
1
WCRP/GEWEX Pathway to LANDFLUX
- 1) CloudClimate Feedback Problem Led to
- ISCCP, SRB and GPCP
- 2) Important (leading) Sources of Uncertainty for
SRB - are Land Surface (Sea Ice) Properties
- Temperature, Emissivity, Spectral Albedo
- 3) Completion of Global (Atmospheric) EW Cycle
Requires Land (Ice) Surface Turbulent Fluxes - 4) Connection of Climate Change to Human
Interests - Requires Land Hydrology Predictions
- Water Storage (Lakes, Soil Moisture, Snow/Ice,
Acquifer) and Runoff (Discharge, Floods)
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Data Sets Potential Status
- DEM and Runoff models Y
Y - Albedo (spectral) Y
Y - Skin Temperature (diurnal) Y
R - (emissivity) Y R
- Vegetation Properties Y
R - (hi-res description) Y R
- Surface Meteorology Y
Yr - Precipitation
Y Y - Snow Water Amount Y
R - Flooding (standing water) Y
R - Water Levels ( discharge) P
R - Soil Moisture
P R - Water Storage P
R - Surface Radiation Y Y
3
Methodology Ideas for Fluxes
- (Wood) Different formulae approaches driven by
radiation (incoming) and precip, wind, Ta Qa - (Lin) ET estimate from microwave index plus
radiation - (Betts) Given Surface Radiation, RH and Precip,
estimate Evaporative Fraction - (Houser/Rodell) Assimilation Approaches
(eventually fully coupled get Houser slide)
(force off-line land surface model GSWP
approach) - (Beljaars) Re-analysis derived results
- (Entekabi) Straight ET estimate from bulk
equations using remote sensing inputs
formulation is separated into different
contributions (not veg-type dependent explicitly)
essence radiation sensible heat flux reduced
by EF-based factor - (Basic) Bulk formulae for SH and ET with remote
sensing inputs - ---- VALIDATION OF RESULTING PRODUCTS
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Some Issues
- 1. Formulation of Land Surface Fluxes in terms of
measurable quantities - 2. Vegetation Structure Function not available
in needed detail - 3. Content (and organization/access) of Flux
Tower data (how useful are these data without
radiation and/or soil moisture/hydrology ie,
what is the best verification??, also issue of
location) - 4. How to treat Spatial Heterogeneity
- 5. Figure out how to improve large-scale
hydrological parameters used in models and
derived from observations
5
Some Recommendations
- We need an international coordination of
landflux sites (like BSRN model)? should
augment BSRN sites or bring flux-tower sites up
to BSRN standards energy/water/carbon (with
hydrology) - We need to make recommendations for Albedo
workshop - We need to stimulate progress on multi-satellite
analyses ltsimultaneous multi-variate retrievalgt
and data-model analyses of land surface fluxes
and hydrology
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Some Actions
- ??? Organize Conduct Albedo Workshop
- SPRING 08
- ??? Organize Conduct Land Surface
- Temperature (Skin and Air) Workshop
- SPRING 08
- ??? Organize Conduct Flux Product Comparison
Workshop - FALL 08
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Observation Constrained Hybrid PBL/Land
Model LandFlux Algorithm Proposal
- Way forward
- Year 1 Proof-of-concept
- Year 2-3 20 year product
- Eval/Calibration plan
- Observational Constraints
- (Consistent 1983-current)
- Surface Radiation (i.e. ISCCP)
- Precipitation (i.e. GPCP)
- Surface Skin Temperature
- Near-Surface T RH
- Innundation
- Albedo
- Vegetation Phenology LAI
- Snow Cover SWE
- Soil Moisture (if available)
- LandFlux Products
- Surface Radiation Balance
- Latent Heat Flux
- Sensible Heat Flux
- CO2 Flux
- Momentum Flux
Land Model
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