NOy Measurements in Polar Stratospheric Clouds and the Gas Phase - Results of the EuPLEx project
Voigt, Christiane and Schlager, Hans and Stock, Paul and Carslaw, Ken and Luo, Beiping and Dörnbrack, Andreas (2004) NOy Measurements in Polar Stratospheric Clouds and the Gas Phase - Results of the EuPLEx project. In: EGU- abstracts 2004. European Geophysical Union Conference, 2004-25-4 - 2004-30-4, Nizza.
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Official URL: http://www.copernicus.org/egu2004/
A PSC has been detected in February 2003 in the Arctic stratosphere by in-situ instruments onboard a high-altitude research aircraft. Small nitric acid (HNO3) containing particles - probably consisting of solid nitric acid trihydrate (NAT) – with diameters up to 6 micrometers and number densities of 3.5 10-4 per cubic centimeter have been measured at altitudes between 18.3 and 19.5 kilometers. Upon growing to larger sizes, these particles have the potential to remove HNO3 from the stratosphere, thereby enhancing polar ozone loss. Interestingly, these NAT particles formed in less than a day at temperatures 0 to 3 Kelvin below the NAT equilibrium temperature TNAT. For the first time, this unique experimental situation at threshold PSC formation conditions allows to constrain current hypotheses of NAT formation. We find that NAT nucleation on meteoritic smoke might explain the present observations, and that this process might be the origin of low number density NAT PSCs.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||NOy Measurements in Polar Stratospheric Clouds and the Gas Phase - Results of the EuPLEx project|
|Journal or Publication Title:||EGU- abstracts 2004|
|Keywords:||PSC, NAT, denitrification, nucleation|
|Event Title:||European Geophysical Union Conference|
|Event Type:||international Conference|
|Event Dates:||2004-25-4 - 2004-30-4|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||W - Projekt Partikel und Zirren II (old)|
|Institutes and Institutions:||Institute of Atmospheric Physics > Atmospheric Trace Species|
Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
|Deposited By:||Dr.rer.nat. Christiane Voigt|
|Deposited On:||16 Jul 2007|
|Last Modified:||27 Apr 2009 13:18|
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