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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.

Full text not available from this repository.

Official URL: http://www.copernicus.org/egu2004/

Abstract

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
Authors:
AuthorsInstitution or Email of Authors
Voigt, ChristianeUNSPECIFIED
Schlager, HansUNSPECIFIED
Stock, PaulUNSPECIFIED
Carslaw, KenUNSPECIFIED
Luo, BeipingUNSPECIFIED
Dörnbrack, AndreasUNSPECIFIED
Date:April 2004
Journal or Publication Title:EGU- abstracts 2004
Keywords:PSC, NAT, denitrification, nucleation
Event Title:European Geophysical Union Conference
Event Location:Nizza
Event Type:international Conference
Event Dates:2004-25-4 - 2004-30-4
Organizer:EGU
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
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)
Location: Oberpfaffenhofen
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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