Title :
Cloud top pressure retrieval from measurements within the O2 -A band with the satellite imaging sensor MERIS
Author :
Preusker, Rene ; Schüller, Lothar ; Fischer, Jürgen
Author_Institution :
Inst. fur Weltraumwissenschaften, Freie Univ. Berlin, Germany
Abstract :
In the near future, global coverage space-borne measurements within the absorption band of oxygen at 761 nm (O2-A band) with an imaging spectrometer of medium spatial resolution will become available through ESA´s Medium Resolution Imaging Spectrometer (MERIS) on ENVISAT. In a cloudy atmosphere, the radiance ratio between an absorbing channel and a window channel is directly related to the averaged photon path length which is mainly determined by the cloud top pressure (ctp). Artificial neural network training has been used to invert the results of radiative transfer simulations. This paper presents the principles of the retrieval scheme, an error and sensitivity analysis to specify the influence of viewing geometry, surface reflection, cloud optical thickness and cloud type on the performance of the algorithm
Keywords :
atmospheric pressure; atmospheric radiation; atmospheric techniques; clouds; geophysical signal processing; image processing; neural nets; oxygen; remote sensing; 761 nm; ENVISAT; MERIS; O2; O2-A band; algorithm; artificial neural network training; averaged photon path length; cloud optical thickness; cloud top pressure retrieval; cloud type; error analysis; performance; radiance ratio; radiative transfer; retrieval scheme; satellite imaging sensor; sensitivity analysis; space-borne measurements; surface reflection; viewing geometry; Absorption; Artificial neural networks; Atmosphere; Atmospheric measurements; Atmospheric modeling; Clouds; MERIS; Optical imaging; Pressure measurement; Spatial resolution;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International
Conference_Location :
Hamburg
Print_ISBN :
0-7803-5207-6
DOI :
10.1109/IGARSS.1999.773428
