Definition of the oxygen A-band channels of ENVISAT's Medium Resolution Imaging Spectrometer for cloud monitoring

M. Kollewe; Juergen Fischer

doi:10.1117/12.196677

23 December 1994 Definition of the oxygen A-band channels of ENVISAT's Medium Resolution Imaging Spectrometer for cloud monitoring

M. Kollewe, Juergen Fischer

Author Affiliations +

Proceedings Volume 2309, Passive Infrared Remote Sensing of Clouds and the Atmosphere II; (1994) https://doi.org/10.1117/12.196677
Event: Satellite Remote Sensing, 1994, Rome, Italy

Abstract

During the `European Lidar Airborne Campaign' in 1990 the backscattered sunlight in the region of the O₂ A-band at 0.76 micrometers was measured above various clouds. The multispectral radiance measurements were performed with a nadir-looking device with a spectral resolution of (Delta) (lambda) equals 0.42 nm. A `Principal Component Analysis' was applied to about 140000 spectra, each consisting of 320 channels. It turns out that above clouds with optical depths (delta) _c > 10 or above clouds over oceans three spectral regions with (Delta) (lambda) approximately equals 2.5 - 5 nm contain the entire information of the high- resolved spectra. One of these intervals is located near the absorption band (window channel) while the remaining two cover the R- and the P-branch of the O₂ A-band, respectively. Based on this finding, the O₂ A-band channels of the planned `Medium Resolution Imaging Spectrometer' (MERIS, ESA), dedicated to the detection of the cloud-top height, are defined.

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M. Kollewe and Juergen Fischer "Definition of the oxygen A-band channels of ENVISAT's Medium Resolution Imaging Spectrometer for cloud monitoring", Proc. SPIE 2309, Passive Infrared Remote Sensing of Clouds and the Atmosphere II, (23 December 1994); https://doi.org/10.1117/12.196677

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