NDLI: The surface pressure retrieval in the MERIS O/sub 2/ absorption: validation and potential improvements

Content Provider	IEEE Xplore Digital Library
Author	Ramon, D. Cazier, L. Santer, R.
Copyright Year	2003
Description	Author affiliation: HYGEOS, Villeneuve d'Ascq, France (Ramon, D.; Cazier, L.)
Abstract	Under clear sky conditions, the surface pressure is a level-2 MERIS product based on a two band ratio between 761.75 nm and 753 nm. This ratio is first corrected from the coupling between scattering and absorption to get the oxygen transmittance T/sub o2/. T/sub o2/ is pre computed versus the air mass m time P to simply derive P from look up tables. The validation of the product itself is done by comparison to the barometric pressure collected from ECMWF and Digital Elevation Model attached to the MERIS product. Above very bright surfaces, the two band ratio directly corresponds to the oxygen transmittance and we can validate the spectral characterization of the instrument as well the as the line by line computations done to simulate T/sub o2/. Above less bright targets, we have to correct from the coupling between scattering and absorption and this correction will be evaluate on different types of surfaces. We will mainly investigate the variation of this correction with the smile effect and air mass. It is also shown how to use the retrieved pressure for flagging cirrus clouds.
Starting Page	3126
Ending Page	3128
File Size	1514354
Page Count	3
File Format	PDF
ISBN	0780379292
DOI	10.1109/IGARSS.2003.1294704
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-07-21
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Absorption Charge coupled devices Sea surface Optical scattering Optical surface waves Polynomials Oxygen Cameras Digital elevation models Instruments
Content Type	Text
Resource Type	Article

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