Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds
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 McMurdo were used for comparison...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/37063 2023-05-15T13:53:55+02:00 Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds Höpfner, Michael Luo, Beiping P. Massoli, Paola Cairo, Francesco Spang, Reinhold Snels, Marcel Di Donfrancesco, Guido Stiller, Gabriele Von Clarmann, Thomas Fischer, Herbert Biermann, U. 2006 application/application/pdf https://hdl.handle.net/20.500.11850/37063 https://doi.org/10.3929/ethz-b-000037063 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-6-1201-2006 info:eu-repo/semantics/altIdentifier/wos/000236950100001 http://hdl.handle.net/20.500.11850/37063 doi:10.3929/ethz-b-000037063 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/2.5/ Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Generic CC-BY-NC-SA Atmospheric Chemistry and Physics, 6 (5) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2006 ftethz https://doi.org/20.500.11850/37063 https://doi.org/10.3929/ethz-b-000037063 https://doi.org/10.5194/acp-6-1201-2006 2023-02-13T00:48:47Z 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 McMurdo were used for comparison with PSC types 1a, 1b and 2. Application of new refractive index data of β-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. ISSN:1680-7375 ISSN:1680-7367 Article in Journal/Newspaper Antarc* Antarctic Antarctica ETH Zürich Research Collection Antarctic The Antarctic |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
description |
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 McMurdo were used for comparison with PSC types 1a, 1b and 2. Application of new refractive index data of β-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. ISSN:1680-7375 ISSN:1680-7367 |
format |
Article in Journal/Newspaper |
author |
Höpfner, Michael Luo, Beiping P. Massoli, Paola Cairo, Francesco Spang, Reinhold Snels, Marcel Di Donfrancesco, Guido Stiller, Gabriele Von Clarmann, Thomas Fischer, Herbert Biermann, U. |
spellingShingle |
Höpfner, Michael Luo, Beiping P. Massoli, Paola Cairo, Francesco Spang, Reinhold Snels, Marcel Di Donfrancesco, Guido Stiller, Gabriele Von Clarmann, Thomas Fischer, Herbert Biermann, U. Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds |
author_facet |
Höpfner, Michael Luo, Beiping P. Massoli, Paola Cairo, Francesco Spang, Reinhold Snels, Marcel Di Donfrancesco, Guido Stiller, Gabriele Von Clarmann, Thomas Fischer, Herbert Biermann, U. |
author_sort |
Höpfner, Michael |
title |
Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds |
title_short |
Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds |
title_full |
Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds |
title_fullStr |
Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds |
title_full_unstemmed |
Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds |
title_sort |
spectroscopic evidence for nat, sts, and ice in mipas infrared limb emission measurements of polar stratospheric clouds |
publisher |
Copernicus |
publishDate |
2006 |
url |
https://hdl.handle.net/20.500.11850/37063 https://doi.org/10.3929/ethz-b-000037063 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Atmospheric Chemistry and Physics, 6 (5) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-6-1201-2006 info:eu-repo/semantics/altIdentifier/wos/000236950100001 http://hdl.handle.net/20.500.11850/37063 doi:10.3929/ethz-b-000037063 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/2.5/ Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Generic |
op_rightsnorm |
CC-BY-NC-SA |
op_doi |
https://doi.org/20.500.11850/37063 https://doi.org/10.3929/ethz-b-000037063 https://doi.org/10.5194/acp-6-1201-2006 |
_version_ |
1766259397429821440 |