Nitric Acid Trihydrate (NAT) formation at low NAT supersaturation in Polar Stratospheric Clouds (PSCs)
A PSC was detected on 6 February 2003 in the Arctic stratosphere by in-situ measurements onboard the high-altitude research aircraft Geophysica. Low number densities (~10-4cm-3) of small nitric acid (HNO3) containing particles (d<6µm) were observed at altitudes between 18 and 20km. Provided the t...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/32668 2023-08-20T04:04:31+02:00 Nitric Acid Trihydrate (NAT) formation at low NAT supersaturation in Polar Stratospheric Clouds (PSCs) Voigt, C. Schlager, Hans Luo, Beiping P. Dörnbrack, Andreas Roiger, Anke Stock, P. Curtius, Joachim Vössing, Hermann Borrmann, Stephan Davies, S. Konopka, Paul Schiller, Cornelius Shur, G. Peter, Thomas 2005 application/application/pdf https://hdl.handle.net/20.500.11850/32668 https://doi.org/10.3929/ethz-b-000032668 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-5-1371-2005 info:eu-repo/semantics/altIdentifier/wos/000229615500002 http://hdl.handle.net/20.500.11850/32668 doi:10.3929/ethz-b-000032668 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/2.5/ Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Generic Atmospheric Chemistry and Physics, 5 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2005 ftethz https://doi.org/20.500.11850/3266810.3929/ethz-b-00003266810.5194/acp-5-1371-2005 2023-07-30T23:50:56Z A PSC was detected on 6 February 2003 in the Arctic stratosphere by in-situ measurements onboard the high-altitude research aircraft Geophysica. Low number densities (~10-4cm-3) of small nitric acid (HNO3) containing particles (d<6µm) were observed at altitudes between 18 and 20km. Provided the temperatures remain below the NAT equilibrium temperature TNAT, these NAT particles have the potential to grow further and to remove HNO3 from the stratosphere, thereby enhancing polar ozone loss. Interestingly, the NAT particles formed in less than a day at temperatures just slightly below TNAT (T>TNAT-3.1K). This unique measurement of PSC formation at extremely low NAT saturation ratios (SNAT≤10) constrains current NAT nucleation theories. We suggest, that the NAT particles have formed heterogeneously, but for certain not on ice. Conversely, meteoritic particles may be favorable candidates for triggering NAT nucleation at the observed low number densities. ISSN:1680-7375 ISSN:1680-7367 Article in Journal/Newspaper Arctic ETH Zürich Research Collection Arctic |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
description |
A PSC was detected on 6 February 2003 in the Arctic stratosphere by in-situ measurements onboard the high-altitude research aircraft Geophysica. Low number densities (~10-4cm-3) of small nitric acid (HNO3) containing particles (d<6µm) were observed at altitudes between 18 and 20km. Provided the temperatures remain below the NAT equilibrium temperature TNAT, these NAT particles have the potential to grow further and to remove HNO3 from the stratosphere, thereby enhancing polar ozone loss. Interestingly, the NAT particles formed in less than a day at temperatures just slightly below TNAT (T>TNAT-3.1K). This unique measurement of PSC formation at extremely low NAT saturation ratios (SNAT≤10) constrains current NAT nucleation theories. We suggest, that the NAT particles have formed heterogeneously, but for certain not on ice. Conversely, meteoritic particles may be favorable candidates for triggering NAT nucleation at the observed low number densities. ISSN:1680-7375 ISSN:1680-7367 |
format |
Article in Journal/Newspaper |
author |
Voigt, C. Schlager, Hans Luo, Beiping P. Dörnbrack, Andreas Roiger, Anke Stock, P. Curtius, Joachim Vössing, Hermann Borrmann, Stephan Davies, S. Konopka, Paul Schiller, Cornelius Shur, G. Peter, Thomas |
spellingShingle |
Voigt, C. Schlager, Hans Luo, Beiping P. Dörnbrack, Andreas Roiger, Anke Stock, P. Curtius, Joachim Vössing, Hermann Borrmann, Stephan Davies, S. Konopka, Paul Schiller, Cornelius Shur, G. Peter, Thomas Nitric Acid Trihydrate (NAT) formation at low NAT supersaturation in Polar Stratospheric Clouds (PSCs) |
author_facet |
Voigt, C. Schlager, Hans Luo, Beiping P. Dörnbrack, Andreas Roiger, Anke Stock, P. Curtius, Joachim Vössing, Hermann Borrmann, Stephan Davies, S. Konopka, Paul Schiller, Cornelius Shur, G. Peter, Thomas |
author_sort |
Voigt, C. |
title |
Nitric Acid Trihydrate (NAT) formation at low NAT supersaturation in Polar Stratospheric Clouds (PSCs) |
title_short |
Nitric Acid Trihydrate (NAT) formation at low NAT supersaturation in Polar Stratospheric Clouds (PSCs) |
title_full |
Nitric Acid Trihydrate (NAT) formation at low NAT supersaturation in Polar Stratospheric Clouds (PSCs) |
title_fullStr |
Nitric Acid Trihydrate (NAT) formation at low NAT supersaturation in Polar Stratospheric Clouds (PSCs) |
title_full_unstemmed |
Nitric Acid Trihydrate (NAT) formation at low NAT supersaturation in Polar Stratospheric Clouds (PSCs) |
title_sort |
nitric acid trihydrate (nat) formation at low nat supersaturation in polar stratospheric clouds (pscs) |
publisher |
Copernicus |
publishDate |
2005 |
url |
https://hdl.handle.net/20.500.11850/32668 https://doi.org/10.3929/ethz-b-000032668 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics, 5 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-5-1371-2005 info:eu-repo/semantics/altIdentifier/wos/000229615500002 http://hdl.handle.net/20.500.11850/32668 doi:10.3929/ethz-b-000032668 |
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_doi |
https://doi.org/20.500.11850/3266810.3929/ethz-b-00003266810.5194/acp-5-1371-2005 |
_version_ |
1774714891688476672 |