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| Titel |
TEC obtained from 3rd Stokes parameter for improved quality of SMOS salinity retrieval |
| VerfasserIn |
Jean-Luc Vergely, Philippe Waldteufel, Jacqueline Boutin, Xiaobin Yin, Paul Spurgeon |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089434
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| Publikation (Nr.) |
 EGU/EGU2014-3637.pdf |
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| Zusammenfassung |
| While SMOS was designed with full polarimetric capability, the 3rd Stokes parameter
information has not been introduced so far in the data processing. The analysis reported in the
present contribution proposes to estimate from this information the total ionospheric electron
content (TEC).
Indeed the Faraday effect generated by the ionospheric electrons on the path from
Earth to satellite is believed to be responsible for large uncertainties in the evening
half-orbits (circa 06 PM local time) when the ionospheric content is close to its diurnal
maximum.
It is shown that the 3rd Stokes parameter exhibits a maximal sensitivity to TEC in a
restricted area located at the front of the SMOS 2D field of view.
However, since the Faraday angle depends on the scalar product between line-of-sight and
magnetic field vectors, a latitudinal zone is found where this sensitivity vanishes. This zone
occurs around 15°N a latitude nearly invariant with longitude around the Earth. Accordingly
it is possible, when carrying out the TEC estimation over a descending half-orbit, to isolate
over this "blind zone" the so-called "Ocean Target Transformation" parameter, which aims at
correcting for pixel dependent biases.
TEC maps obtained in this way compare favorably with maps built from GPS
measurements, which have been introduced so far in the SMOS processing chain
as auxiliary data. The space resolution is somewhat improved, allowing a better
selection of the relevant electron content in zones exhibiting large horizontal TEC
gradients.
In a latter step, based on the TEC maps, it becomes possible to recompute the OTT
correction for those brightness temperature components to be used as input in the salinity
retrieval.
Then the additional information impacts the salinity retrieval both directly (as the quality
of the TEC auxiliary data is improved) and indirectly (as the empirical OTT correction is no
longer contaminated by spurious Faraday rotation effects).
The respective contributions of both effects will be assessed and discussed. They result on
the whole in a significant improvement of the SMOS retrieved salinity; this is evidenced by a
large reduction of a spurious latitudinal variation which was so far considered as a bias
originating in instrumental effects. |
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