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Author
T. Dinh, A. Podglajen, A. Hertzog, B. Legras, R. Plougonven
Title
Effect of gravity wave temperature fluctuations on homogeneous ice nucleation in the tropical tropopause layer
Type
Journal
Year
2016
Publication
Atmospheric Chemistry and Physics
Abbreviated Journal
Volume
16
Issue
1
Pages
35-46
Keywords
Abstract
The impact of high-frequency fluctuations of temperature on homogeneous nucleation of ice crystals in the vicinity of the tropical tropopause is investigated using a bin microphysics scheme for air parcels. The imposed temperature fluctuations come from measurements during isopycnic balloon flights near the tropical tropopause. The balloons collected data at high frequency, guaranteeing that gravity wave signals are well resolved.
With the observed temperature time series, the numerical simulations with homogeneous freezing show a full range of ice number concentration (INC) as previously observed in the tropical upper troposphere. In particular, a low INC may be obtained if the gravity wave perturbations produce a non-persistent cooling rate (even with large magnitude) such that the absolute change in temperature remains small during nucleation. This result is explained analytically by a dependence of the INC on the absolute drop in temperature (and not on the cooling rate). This work suggests that homogeneous ice nucleation is
not
necessarily inconsistent with observations of low INCs.
Programme
914
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Summary Language
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ISSN
1680-7316
ISBN
Medium
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Conference
Notes
Approved
yes
Call Number
Serial
8280
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