SMOS L2 OS ATBD - ARGANS

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165 ICM-CSIC LOCEAN/SA/CETP IFREMER 2 cos ( a) A1 2 sin ( a) A2 2 sin ( a) 2 cos ( a) cos( a) sin( a) TH cos( a) sin( a) TV T 3 If T3 is assumed to be zero then the equation becomes: A1 cos A2 sin 2 2 a 2 sin a a 2 cos a T T H V T H MR2 TV SMOS L2 OS Algorithm Theoretical Baseline Document MR2 TH TV T3 Doc: SO-TN-ARG-GS-0007 Issue: 3 Rev: 9 Date: 25 January 2013 Page: 165 There is a singularity problem if cos(a) = sin(a), i.e. a = /4 or 3/4. In such a configuration, A1 = A2 = (TH + TV)/2 and it is not possible to derive TH and TV from A1 and A2. Full polarization mode: 2 a sin a 2 a cos a A1 2 cos cos( a) sin( a) 0TH 2 A2 sin cos( a) sin( a) 0 TV A3 sin( 2a) sin( 2a) cos( 2a) 0T3 A4 0 0 0 1T4 No singularities appear in this mode. MR4 As it has been shown by simulation studies and experimental data that over the ocean Thv ≈ Tvh ≈ 0, the third Stokes parameter at Earth reference frame is considered also to be 0 at first approximation. However, theoretical models provide non zero T3 and T4 so we recommend to keep the possibility of taking into account non zero T3, even in dual pol mode. Then the different sub-models provided in this SSS ATBD are valid either for dual-pol or full-pol formulation. If the first Stokes parameter is used for the iterative retrieval I = A1 + A2 = Th + Tv and there is no need to apply any of the above described transformations. References Camps, A., M. Vall-llossera, N. Duffo, F. Torres, and I. Corbella (2005), Performance of Sea Surface Salinity and Soil Moisture retrieval algorithms with different auxiliary datasets in 2- D L-band aperture synthesis interferomètric radiometers, IEEE Trans. Geosci. Remote Sens., 43(5), May 2005 Claassen, J.P., and A.K. Fung, The Recovery of Polarized Apparent Temperature Distributions of Flat Scenes from Antenna Temperature Measurements, IEEE Transactions on Antennas and Propagation, AP-22 (3), 433-442, 1974. Waldteufel, P. et Caudal, G. Off-axis Radiometric Measurements; Application to Interferometric Antenna Design. IEEE TGARS, 40, 6, juin 2002, 1435-1439 T T T T H V 3 4
166 ICM-CSIC LOCEAN/SA/CETP IFREMER SMOS L2 OS Algorithm Theoretical Baseline Document Doc: SO-TN-ARG-GS-0007 Issue: 3 Rev: 9 Date: 25 January 2013 Page: 166 Waldteufel, P, Floury, N., Dinnat, E., Caudal, G., Ionospheric Effects for L-abnd “-D Interferometric Radiometry, IEEE TGARS, 42, 1, janvier 2004, 105-118
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Presence of ice Applying sea ice ma
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Classification of grid point: g Oce
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36 3.5. Outliers detection ICM-CSIC
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52 4.1. Flat sea ICM-CSIC LOCEAN/SA
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Page 181 and 182: I(θ_mean)=A1(θx)+A2(θy) where θ
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Page 187 and 188: Tb_i 2 = Tb_meas_i 2 174 ICM-CSIC L
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SMOS L2 OS ATBD - ARGANS

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