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Analysis of AMSR-E C & X-band Tb data dependencies with wind & wave characteristics.

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Presentation on theme: "Analysis of AMSR-E C & X-band Tb data dependencies with wind & wave characteristics."— Presentation transcript:

1 Analysis of AMSR-E C & X-band Tb data dependencies with wind & wave characteristics

2 Questions ? How is Roughness-induced sea surface emissivity in the low frequency microwave domain dependent with sea surface state & wave developement ? Impacts of swell, pure wind seas or mixed sea states on the emissivity at X, C & L -bands? Needs to get sea state parametrization & active/passive roughness effects consistency in the aquarius L-band SSS retrieval algorithm

3 How ? Collect one month (aug 2010) of global L2A AMSR-E Tbs & L2 ocean products (sst, wind, water vapor, …) Evaluate surface emissivity e surf residuals based on Wentz algorithm for atmospheric & external sources corrections Co-locate AMSR-E data with wave parameters (total significant wave height Hs, significant wave height for wind sea Hs ws ) from ECMWF-WAM model forecasts (3-hourly at 0.25° res) and ECMWF U 10 Estimate roughness-induced residuals Δe rough using in situ SSS & AMSRE.SST to evaluate flat sea contribution statistical depedencies of Δe rough with bins of Hs,U 10 & Hs ws

4 Déploiement, Collecte & Traitement des Données In situ de surface pour la Validation de SMOS Projet GLOSCAL

5 Exemple of the Data set over 1 25 km resolution Objectively Analyzed Standardized in situ data +climatology LPO

6 Dielectric constant model (Klein & swift, 76) Estimating the Flat sea surface Tbs contributions

7 Estimated monthly mean-averaged Flat sea surface Tbs contributions for X & C, H-V AMSR-E channels

8 Estimated surface Tbs from X & C, H-V AMSR-E data

9 Wind & wave products

10 Co-localisation AMSR-ECMWF: |Δ t|<1.5 Hour & | Δ x|<25 km

11 Estimated monthly-averaged roughness induced emissivity residuals

12 Mean Roughness induced emissivity residuals as function of surface wind speed

13 Mean Roughness induced emissivity residuals as function of surface wind speed & total significant wave-height

14 Selection of data for ECMWF winds 4.5

15 Selection of data for ECMWF winds 4.5

16 Illustration of the Mean Large Scale Wave impact on Roughness induced emissivity residuals at a fixed surface wind speed of ~8 m/s

17 Monthly average signature of tropical freswaterpools in AMSR-E Tbs

18 Monthly average signature of Tropical Atlantic freshwaterpools in AMSR-E Tbs Orrinoco RiverAmazon River Niger River Congo River Senegal & Geba Rivers

19 Mississipi Delta Freshwater runoff into the Tehuantepec Gulf

20 Ganges and Brahmaputra Rivers Irrawaddy Delta Indus Delta

21 Yangtse River


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