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Flugzeuggetragene Messungen von Stickoxidverbindungen und Eiswolken in der tropischen Tropopausenregion

Voigt, Christiane (2006) Flugzeuggetragene Messungen von Stickoxidverbindungen und Eiswolken in der tropischen Tropopausenregion. Seminarvortrag Meteorologische Kolloquium, Karlsruhe.

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Abstract

Uptake of nitric acid in cirrus clouds has extensively been studied during field missions in the last decade with the aim to understand the interactions of trace gases with ice crystals and cirrus cloud formation. Further, the uptake of nitric acid in aerosol and ice particles can change the partitioning of the reactive NOy species and influence the ozone budget of the tropical tropopause region. Nitric acid has been detected in tropical cirrus clouds above Darwin during the SCOUT campaign 2005. The HNO3 content of the ice crystals is evaluated in terms of HNO3/H2O molar ratios in ice and the fraction of total HNO3 bound in ice crystals is determined. Both values increase with decreasing temperature. We compare our data to results from previous field campaigns in subtropical, midlatitude and polar regions. The observations at temperatures above 200 K can be explained by uptake of HNO3 in ternary aerosol serving as freezing nuclei and subsequent trapping of HNO3 during ice crystal growth.

Document Type:Conference or Workshop Item (Speech)
Title:Flugzeuggetragene Messungen von Stickoxidverbindungen und Eiswolken in der tropischen Tropopausenregion
Authors:
AuthorsInstitution or Email of Authors
Voigt, ChristianeUNSPECIFIED
Date:18 July 2006
Keywords:cirrus clouds, convection, transport
Event Title:Seminarvortrag Meteorologische Kolloquium
Event Location:Karlsruhe
Event Type:Other
Organizer:Forschungszentrum und Universität Karlsruhe
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Christiane Voigt
Deposited On:16 Jul 2007
Last Modified:27 Apr 2009 13:57

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