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

ID: 29153.0, MPI für Kernphysik / Physics of Atmospheric Molecular Processes
Microphysical mesoscale simulations of polar stratospheric cloud formation constrained by in situ measurements of chemical and optical cloud properties
Authors:Larsen, N.; Svendsen, S. H.; Knudsen, B. M.; Voigt, C.; Weisser, C.; Kohlmann, A.; Schreiner, J.; Mauersberger, K.; Deshler, T.; Kroger, C.; Rosen, J. M.; Kjome, N. T.; Adriani, A.; Cairo, F.; Di Donfrancesco, G.; Ovarlez, J.; Ovarlez, H.; Dornbrack, A.; Birner, T.
Date of Publication (YYYY-MM-DD):2002-09
Title of Journal:Journal of Geophysical Research-Atmospheres
Journal Abbrev.:J. Geophys. Res.-Atmos.
Issue / Number:D20
Start Page:8301
End Page:8301
Sequence Number of Article:8301
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:A detailed microphysical model has been used to simulate polar stratospheric clouds (PSC) formed in mountain leewaves over northern Scandinavia and observed in a balloonborne multi- instrument flight on 25 January 2000. The measurements show cloud layers of large solid particles with nitric acid trihydrate (NAT) compositions at relatively high temperatures and layers containing liquid particles with supercooled ternary solution compositions at very low temperatures. The same PSC particle layers have been observed several times during the 2 1/2 h flight, offering a nearly Lagrangian picture of the particle evolution. The applied PSC model describes homogeneous freezing of ice below the ice frost point and diffusion-limited nonequilibrium and size-dependent growth and composition of liquid and solid-phase particles. The microphysical box model calculations are performed on two isentropic surfaces, corresponding to different observed particle layers, using temperature histories from combined high-resolution nonhydrostatic mesoscale and synoptic-scale model analyses of the meteorological conditions characterized by strong mountain leewaves. The calculated particle composition, physical phase, and particle size distributions are compared with the in situ measurements of the same particle properties. It appears that homogeneous freezing of ice in liquid solutions a few degrees below the ice frost point and subsequent release of NAT at higher temperatures might explain the characteristics of the observed solid PSC particles.
Free Keywords:polar stratospheric clouds; microphysics; nucleation; mountain wave; in situ measurements
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group K. Mauersberger/Aerosols in Polar Stratospheric Clouds (J. Schreiner)
External Affiliations:Danish Meteorol Inst, DK-2100 Copenhagen, Denmark; Univ Wyoming, Dept Atmospher Sci, Laramie, WY 82071 USA; Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA; Ist Sci Atmosfera & Clima, Sez Roma, I-00133 Rome, Italy; Ente Nouve Tecnol Energia & Ambiente, Rome, Italy; Ecole Polytech, Meteorol Dynam Lab, F-91128 Paris, France; DLR Oberpfaffenhofen, Inst Atmospher Phys, Wessling, Germany
Identifiers:ISI:000180466200115 [ID No:1]
ISSN:0747-7309 [ID No:2]
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