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000032642 0247_ $$2DOI$$a10.1029/2003GL017231
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000032642 084__ $$2WoS$$aGeosciences, Multidisciplinary
000032642 1001_ $$0P:(DE-Juel1)VDB1549$$aSpang, R.$$b0$$uFZJ
000032642 245__ $$aObservations of a distinctive infra-red spectral feature in the atmospheric spectra of polar stratospheric clouds measured by the CRISTA instrument
000032642 260__ $$aWashington, DC$$bAmerican Geophysical Union$$c2003
000032642 300__ $$a1875
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000032642 440_0 $$02249$$aGeophysical Research Letters$$v30$$x0094-8276$$y16
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000032642 520__ $$a[1] Polar stratospheric cloud particles (PSCs) are known to strongly influence the infra-red emission spectrum of the lower stratosphere in cold polar winters. The characteristics of these infra-red features have been examined using limb sounding spectra recorded by the CRISTA experiment in August 1997 when many Antarctic PSCs were observed. A distinctive spectral feature centered at 820 cm(-1) has been identified in many of these spectra, the first time that a particular band has been observed in the spectra of PSCs in the atmosphere. The feature can be attributed to the nu(2) band of the NO3- ion and strongly suggests a condensed nitric acid component to the particles in the form of solid nitric acid trihydrate (NAT) or liquid ternary solution (STS). The spectral signatures belong to a definite sub-set of the PSC observations recorded by CRISTA. The particles are observed at temperatures well above 192 K, allowing for temperature errors, and it is suggested that NAT particles are the most likely source of the spectral signature. In addition, it is shown that PSC events in which no spectral signature is present are only observed below 192 K and display a very similar HNO3- temperature relationship to STS particles.
000032642 536__ $$0G:(DE-Juel1)FUEK257$$2G:(DE-HGF)$$aChemie und Dynamik der Geo-Biosphäre$$cU01$$x0
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000032642 7001_ $$0P:(DE-HGF)0$$aRemedios, J. J.$$b1
000032642 773__ $$0PERI:(DE-600)2021599-X$$a10.1029/2003GL017231$$gVol. 30, p. 1875$$p1875$$q30<1875$$tGeophysical research letters$$v30$$x0094-8276$$y2003
000032642 8567_ $$uhttp://dx.doi.org/10.1029/2003GL017231
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000032642 9141_ $$y2003
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000032642 9201_ $$0I:(DE-Juel1)VDB47$$d31.12.2006$$gICG$$kICG-I$$lStratosphäre$$x0
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