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| Titel |
MIPAS detects Antarctic stratospheric belt of NAT PSCs caused by mountain waves |
| VerfasserIn |
M. Höpfner, N. Larsen, R. Spang, B. P. Luo, J. Ma, S. H. Svendsen, S. D. Eckermann, B. Knudsen, P. Massoli, F. Cairo, G. Stiller, T. Clarmann, H. Fischer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 5 ; Nr. 6, no. 5 (2006-04-20), S.1221-1230 |
| Datensatznummer |
250003725
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| Publikation (Nr.) |
 copernicus.org/acp-6-1221-2006.pdf |
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| Zusammenfassung |
| Space borne infrared limb emission measurements by the Michelson Interferometer for Passive Atmospheric Sounding
(MIPAS) reveal the formation of a belt of polar stratospheric clouds (PSCs) of nitric acid trihydrate (NAT) particles
over Antarctica in mid-June 2003. By mesoscale microphysical simulations we show
that this sudden onset of NAT PSCs was caused by heterogeneous nucleation on ice in the
cooling phases of large-amplitude stratospheric mountain waves over the Antarctic
Peninsula and the Ellsworth Mountains.
MIPAS observations of PSCs before this event show
no indication for the presence of NAT clouds with volume densities larger than about 0.3 µm3/cm3
and radii smaller than 3 µm, but are consistent with supercooled droplets of
ternary H2SO4/HNO3/H2O solution (STS).
Simulations indicate that homogeneous surface nucleation rates have to be
reduced by three orders of magnitude to comply with the observations. |
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