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000032641 084__ $$2WoS$$aEngineering, Aerospace
000032641 084__ $$2WoS$$aAstronomy & Astrophysics
000032641 084__ $$2WoS$$aGeosciences, Multidisciplinary
000032641 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000032641 1001_ $$0P:(DE-Juel1)VDB1549$$aSpang, R.$$b0$$uFZJ
000032641 245__ $$aColour indices for the detection and differentiation of cloud types in infra-red limb emission spectra
000032641 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2004
000032641 300__ $$a1041 - 1047
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000032641 440_0 $$09884$$aAdvances in Space Research$$v33$$x0273-1177
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000032641 520__ $$aSimple radiance ratios have been used for the detection of clouds around the tropopause and in the winter polar stratosphere from the infra-red spectra of two remote sensing instruments, the cryogenic infrared spectrometers and telescopes for the atmosphere (CRISTA) flown on two space shuttle missions in 1994 and 1997 and the Michelson interferometer for passive atmospheric sounding (MIPAS) launched on ENVISAT in March 2002. This very successful approach was first applied to different wavelength regions of the CRISTA measurements and was then used as a pre-flight validation test for a cloud detection algorithm of the operational retrieval processor for MIPAS. Preliminary results are now available from the MIPAS instrument and are presented here. First, cloud top heights have been derived down to 12 kin by the detection method and show quite reasonable results. In addition, modelled spectra and measurements show that the extension of the method to lower altitudes - potentially down to 6 km should be possible. Second, the high spectral resolution of the MIPAS measurements allows in addition the detection of scattering effects in the spectra, which gives the future opportunity to retrieve information about the size of the scattering particles. In particular, an index has been developed which allows large particle clouds to be identified. Finally, investigations of CRISTA spectra have already shown that the differentiation of polar stratospheric cloud (PSC) types is possible based on their characteristic spectral features. Application of the differentiation method to the tropics shows no indication for clouds containing PSC-like nitric-acid-hydrate particles. (C) 2003 COSPAR. Published by Elsevier Ltd. All rights reserved.
000032641 536__ $$0G:(DE-Juel1)FUEK257$$2G:(DE-HGF)$$aChemie und Dynamik der Geo-Biosphäre$$cU01$$x0
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000032641 65320 $$2Author$$aremote sensing
000032641 65320 $$2Author$$acloud type differentiation
000032641 65320 $$2Author$$aMIPAS
000032641 65320 $$2Author$$aCRISTA
000032641 65320 $$2Author$$apolar stratospheric clouds
000032641 65320 $$2Author$$acirrus clouds
000032641 7001_ $$0P:(DE-HGF)0$$aRemedios, J. J.$$b1
000032641 773__ $$0PERI:(DE-600)2023311-5$$a10.1016/S0273-1177(03)00585-4$$gVol. 33, p. 1041 - 1047$$p1041 - 1047$$q33<1041 - 1047$$tAdvances in space research$$v33$$x0273-1177$$y2004
000032641 8567_ $$uhttp://dx.doi.org/10.1016/S0273-1177(03)00585-4
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