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          Institute: MPI für Kernphysik     Collection: Physics of Atmospheric Molecular Processes     Display Documents

ID: 54623.0, MPI für Kernphysik / Physics of Atmospheric Molecular Processes
In situ mountain-wave polar stratospheric cloud measurements: Implications for nitric acid trihydrate formation
Authors:Voigt, Christiane; Larsen, Niels; Deshler, Terry; Kröger, C.; Schreiner, Jochen; Mauersberger, Konrad; Luo, Bei Ping; Adriani, Alberto; Cairo, Francesco; Di Donfrancesco, Guido; Ovarlez, Joelle; Ovarlez, Henri; Dörnbrack, Andreas; Knudsen, B.; Rosen, James
Date of Publication (YYYY-MM-DD):2003-02-19
Title of Journal:Journal of Geophysical Research - Atmospheres
Journal Abbrev.:J. Geophys. Res.
Issue / Number:D5
Sequence Number of Article:8331
Copyright:Copyright by the American Geophysical Union
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Particle size distribution, composition, and optical properties of polar stratospheric clouds (PSCs) have been measured above northern Scandinavia during a nocturnal balloon flight within the polar vortex on 19 January 2000. The mountain-wave PSC mainly consisted of nitric acid trihydrate (NAT) particles with number densities between 0.01 and 0.2 cm-3, median radii of 1 to 2 µm and volumes up to 1 µm3cm-3. A comparison between optical PSC data and optical simulations based on the measured particle size distribution indicates that the NAT particles were aspherical with an aspect ratio of 0.5. The NAT particle properties have been compared to another PSC observation on 25 January 2000, where NAT particle number densities were about an order of magnitude higher. In both cases, microphysical modeling indicates that the NAT particles have formed on ice particles in the mountain-wave events. Differences in the NAT particle number density can be explained by the meteorological conditions. We suggest that the higher NAT number density on 25 January can be caused by stronger wave activity observed on that day, larger cooling rates and therefore higher NAT supersaturation.
Free Keywords:polar stratospheric cloud (PSC), nitric acid trihydrate (NAT), ozone, gravity wave, PSC formation
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group K. Mauersberger/Aerosols in Polar Stratospheric Clouds (J. Schreiner)
External Affiliations:Voigt, C, Ist Sci Atmosfera & Clima, Sez Roma, Via Fosso Cavaliere 100, I-00133 Rome, Italy, Ist Sci Atmosfera & Clima, Sez Roma, I-00133 Rome, Italy, Univ Wyoming, Dept Atmospher Sci, Laramie, WY 82071 USA, Inst Phys Atmosphäre, D-82234 Wessling, Germany, Danish Meteorol Inst, Div Middle Atmospher Res, DK-2100 Copenhagen, Denmark, Swiss Fed Inst Technol, IACETH, HPP, CH-8093, Zurich, Switzerland, Meteorol Dynam Lab, UMR 8539, F-91128 Palaiseau, France
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