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Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds (Articolo in rivista)
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- Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Alternative label
M. Hopfner (1); B. P. Luo (2); P. Massoli (3)(*); F. Cairo (3); R. Spang (4); M. Snels (3); G. Di Donfrancesco (5); G. Stiller (1); T. von Clarmann (1); H. Fischer (1); U. Biermann (6)(**) (2006)
Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds
in Atmospheric chemistry and physics (Print)
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- M. Hopfner (1); B. P. Luo (2); P. Massoli (3)(*); F. Cairo (3); R. Spang (4); M. Snels (3); G. Di Donfrancesco (5); G. Stiller (1); T. von Clarmann (1); H. Fischer (1); U. Biermann (6)(**) (literal)
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- 1 Forschungszentrum Karlsruhe, Institut fur Meteorologie und Klimaforschung, Karlsruhe, Germany
2 Institut fur Atmosphare und Klima, ETH-Honggerberg, Zurich, Switzerland
3 Consiglio Nazionale delle Ricerche, Istituto di Scienze dell'Atmosfera e del Clima, Rome, Italy
4 Forschungszentrum Julich, Institut fur Chemie und Dynamik der Geosphare, Julich, Germany
5 Ente per le Nuove tecnologie, l'Energie e l'Ambiente, Rome, Italy
6 Max-Planck-Institut fur Chemie, Abteilung Atmospharenchemie, Mainz, Germany
* University of Colorado, Cooperative Institute for Research in the Environmental Sciences, Boulder, CO, United States
** Referat für Umwelt- und Energiepolitik des SPD-Parteivorstandes, Berlin, Germany (literal)
- Titolo
- Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds (literal)
- Abstract
- We have analyzed mid-infrared limb-emission
measurements of polar stratospheric clouds (PSCs) by the
Michelson Interferometer for Passive Atmospheric Sounding
(MIPAS) during the Antarctic winter 2003 with respect to
PSC composition. Coincident Lidar observations from Mc-
Murdo were used for comparison with PSC types 1a, 1b and
2. Application of new refractive index data of -NAT have
allowed to accurately simulate the prominent spectral band at
820 cm-1 observed by MIPAS at the location where the Lidar
instrument observed type 1a PSCs. Broadband spectral
fits covering the range from 780 to 960 cm-1 and from 1220
to 1490 cm-1 showed best agreement with the MIPAS measurements
when spectroscopic data of NAT were used to simulate
the MIPAS spectra. MIPAS measurements collocated
with Lidar observations of Type 1b and Type 2 PSCs could
only be reproduced by assuming a composition of supercooled
ternary H2SO4/HNO3/H2O solution (STS) and of ice,
respectively. Particle radius and number density profiles derived
from MIPAS were generally consistent with the Lidar
observations. Only in the case of ice clouds, PSC volumes
are partly underestimated by MIPAS due to large cloud optical
thickness in the limb-direction. A comparison of MIPAS
cloud composition and Lidar PSC-type determination based
on all available MIPAS-Lidar coincident measurements revealed
good agreement between PSC-types 1a, 1b and 2, and
NAT, STS and ice, respectively. We could not find spectroscopic
evidence for the presence of nitric acid dihydrate
(NAD) from MIPAS observations of PSCs over Antarctica
in 2003. (literal)
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