SMOS L2 OS ATBD - ARGANS
SMOS L2 OS ATBD - ARGANS
SMOS L2 OS ATBD - ARGANS
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3<br />
ICM-CSIC<br />
LOCEAN/SA/CETP<br />
IFREMER<br />
<strong>SM<strong>OS</strong></strong> <strong>L2</strong> <strong>OS</strong><br />
Algorithm Theoretical<br />
Baseline Document<br />
Doc: SO-TN-ARG-GS-0007<br />
Issue: 3 Rev: 9<br />
Date: 25 January 2013<br />
Page: 3<br />
HH along polarization direction H.<br />
VV along polarization direction V.<br />
HV: one arm set to H, the two others set to V.<br />
VH: one arm set to V, the two others set to H. HV and VH mode<br />
produce complex brightness temperatures that are complex conjugates.<br />
In L1C product, both HV and VH modes feed the HV brightness<br />
temperature data field with real and imaginary parts (see SO-TN-<br />
DME-L1PP-0024 and SO-IS-DME-L1PP-0002).<br />
MIRAS operating mode: MIRAS has two operating modes:<br />
Dual polarization mode: measurement sequence is - HH – VV – HH<br />
– VV –HH – VV -…<br />
Full polarization mode: Measurement cycle is - HH – HV – VV – VH<br />
– HH – HV – VV – VH – HH - … (see SO-TN-DME-L1PP-0024)<br />
Retrieval Polarization mode: to derive SSS, one can use<br />
Stokes 1 parameter, i.e. the sum of brightness temperatures in H and V<br />
polarization directions (Stokes 1 retrieval mode).<br />
Brightness temperatures in H and V polarization directions (dual pol<br />
retrieval mode).<br />
Brightness temperatures in H and V directions and real and imaginary<br />
part in HV (full pol retrieval mode).<br />
Modified Stokes vector: Full polarimetric set of temperatures proportional to<br />
modified Stokes parameters as defined by Ulaby, p. 1086<br />
Prior values: Values of the geophysical parameters, obtained from external sources,<br />
that are introduced, with their uncertainties, in the cost function, as reference<br />
information of the variability range during the iterative retrieval<br />
First guesses: Initial values of the geophysical parameters to be retrieved that are<br />
introduced in the first step of the minimisation process, and that will be successively<br />
modified during the iterations until achieving a retrieved value<br />
See the Software Release Document for a list of acronyms.<br />
1.3 List of variables<br />
The modified Stokes vector in the antenna reference frame is [A1, A2, A3, A4] instead<br />
of [Txx, Tyy, Txy] in level 1, with:<br />
A1 = Txx<br />
A2 = Tyy<br />
A3 = 2 Re(Txy)<br />
A4 = 2 Im(Txy)
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