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OVERVIEW OF SATELLITE BASED PRODUCTS FOR GLOBAL ET
Matthew McCabe, Carlos Jimenez, Bill Rossow, Sonia Seneviratne, Eric Wood and numerous data providers & contributors…
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GEWEX LANDFLUX PROJECT“Produce a GLOBAL multi decadal surface flux product”‐ Jimenez et al (2011) “Global inter-comparison of 12 land surface
heat flux estimates” JGR 116(2), D02102 Mueller et al (2011) “Evaluation of global evapotranspiration
datasets: first results of the LandFlux-EVAL project” GRL, 38, LO6402
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AVAILABLE PRODUCTS & SCALES
Product Theoretical Basis Spatial Resolution
Temporal Resolution
Temporal Coverage
UMONT-A PM 1km 8-day 2000-2010UMONT-B PM 8km Daily 1983-2006
CSIRO-PML PM 0.5° Monthly 1981-2006PRU-1 PM 1°-2° 3hr/Daily 1984-2007PRU-2 MOST 5km 3hr/Daily 2000-2010PRU-3 PT 1°-2° 3hr/Daily 1984-2007
UCB-JPL PT 1km-1° Monthly 1984-2010GLEAM PT 0.25° Daily 1984-2007ALEXI* MOST 0.25° Daily 2000-2010
UMT/BNU* Empirical-PM 1° Daily 1982-2006Paris-O Neural Network 0.5° Monthly 1992-1999
Max-Planck Tree-ensemble 0.25° Monthly 1982-2008
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PRODUCT SIMILARITIESMonin-Obukhov Similarity Theory (MOST)
considering or ignoring stability correction terms + other assumptions lead to different ET formulations (Penman, Priestley-Taylor etc…)
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PRODUCT DIFFERENCES Spatial – what does 0.25° (or 1°) ET represent? Temporal – how are values scaled (consistency in EF?) Forcing clearly plays a major role in flux variation
Note that no products use the same forcing!
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PRODUCTION & EVALUATIONOutcome of EGU-Vienna meeting (April, 2011: Consensus amongst several product participants Version 0 will be a number of ‘competing’ products Agreement to run using common forcing – but yet to
agree on that format (some problematic variables) Likely SRB 4.0 rad and associated met inputs 3 hourly, 0.5 degree LE & H (common methodology for G??)
When? Need to compile forcings (timing of SRB 4.0)
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PRODUCT EVALUATION PLANSProduct assessment requires analysis over a range of regional and global scales: Wood@Princeton: have compared SEBS, PM & PT
using common Aqua forcing for 3 years; 1984-2007 ensemble approach globally
Fisher@JPL (planned): 5 RS-ET models and 3 LSMs using identical forcing data and model protocols. 1 km resolution, validated against 253 sites (La Thuille)
McCabe@UNSW (just started): GEWEX-RHP scale multi-model comparison with common WRF forcing
Sonia@ETH + Carlos@P-O (just heard)
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MULTI-MODELS OVER THE MDBUsing common WRF forcing: a) PM, b) SEBS, c) WRF-NOAHshows inherent model differences that need investigation
Latent Heat Flux (W/m2)
4000
a) b) c)
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0 600
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MULTI-MODELS AT TUMBARUMBAUsing common forcing – PM, SEBS, WRF
Feb-00
Jun-00
Oct-00
Feb-01
Jun-01
Oct-01
Feb-02
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Oct-02
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Oct-08
0
100
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400
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WFEBPMAAPTObs
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MDB INTERCOMPARISON
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MDB INTERCOMPARISON
Dry pixel, 10km resolution
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MDB INTERCOMPARISON
Dry pixel, 30km resolution
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MDB INTERCOMPARISON
Dry pixel, 50km resolution
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MDB INTERCOMPARISON
Dry pixel, 90km resolution
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MDB INTERCOMPARISON
Dry, Semi, Wet pixels (top to bottom), 50km resolution
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MDB INTERCOMPARISON
Observations, Tumbarumba
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MULTI-SENSOR ESTIMATESMulti-model/multi-sensor runs from Princeton group: SEBS, PM and modified-PT approach ISCCP and SRB for forcing (and PU forcing) Issues in ISCCP…so used 2 SRB data sets (SRB/SRB-QC) daily time scale/0.5 degree/1984-2007
Input data initially evaluated against PU 50 yr forcing data…resulting in a composite dataset
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MULTI-SENSOR ESTIMATES
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MULTI-SENSOR ESTIMATES
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MULTI-SENSOR ESTIMATES
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MULTI-SENSOR ESTIMATESMulti-model/multi-sensor runs from Princeton group: Issues in Ts-Ta between data sets (which is right??) Noted issues in humidity and temp trends (compared
to PU data set)
Uncertainty b/w models > uncertainty in rad forcing Largest uncertainty (absolute) in humid tropics Largest uncertainty (mean) in transitional regions
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MODEL EVALUATIONRange of evaluation efforts being undertaken: Tower data (where, when, number) Basin (P-ET-dS/dt) – which P, which dS/dT, accuracy in R Atmospheric water budgets Hydrological consistency
Need a co-ordinated approach to product evaluation Requires identification of high quality data-sets Agreement on spatial and temporal scales Metrics for assessment
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CONTINUED EVALUATIONNeed to examine issues of: Model interdependencies (forcing and formulation) Sensitivity of approaches to forcing variables Regional scale (MDB) and daily evaluation of retrievals
- do products represent diurnal variability (3 hourly)
- are spatial patterns reflected at the regional scale
- how consistent are the retrievals with other data
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NEEDED DISCUSSIONS Significant uncertainties in radiation Accuracy of all data sets (ET as a Level 4 product) Consistency in ‘stable’ forcing (LULC, basin/land masks) Aerodynamic and surface properties are key: techniques
to derive these? Spatial and temporal scales – who are the users? Accuracy in evaluations (runoff & rainfall data-sets) How to include snow, interception Dual-source models and GEWEX independent datasets Regional scale intercomparisons (diurnal scale)
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Overview of Satellite Based Products for Global ET
Matthew McCabe, Carlos Jimenez, Bill Rossow, Sonia Seneviratne, Eric Wood and numerous data providers & contributors…
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BREAKDOWN OF APPROACHESPenman-Monteith assumptions: sufficient upwind fetch a uniform saturated surface the canopy satisfies the big leaf assumption approximate the slope of the saturation vapor pressure
curve with ambient temperature and water vapor
Priestley-Taylor assumptions: No advection, wet surface and long fetch, therefore,
wind function in the Penman function tends to zero
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GEWEX LANDFLUX PROJECTWhat has been determined so far? Geographic patterns broadly consistent Large range in some regions esp. tropics & rainforests Range in IPCC model simulations not markedly
different from other data
More detailed analysis and interpretation is required! No common data set for algorithm inter-comparison No benchmark with which to compare data Inter-dependence of data sets is an issue
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MDB INTERCOMPARISON
38
06
08
SEBS WRF AMSR-ECLM NOAH
SEBS WRF AMSR-ECLM NOAH
SEBS WRF AMSR-ECLM NOAH
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MULTI-SENSOR ESTIMATES