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| Titel |
The SCOUT-O3 Darwin Aircraft Campaign: rationale and meteorology |
| VerfasserIn |
D. Brunner, P. Siegmund, P. T. May, L. Chappel, C. Schiller, R. Müller, T. Peter, S. Fueglistaler, A. R. MacKenzie, A. Fix, H. Schlager, G. Allen, A. M. Fjǽraa, M. Streibel, N. R. P. Harris |
| 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 ; 9, no. 1 ; Nr. 9, no. 1 (2009-01-08), S.93-117 |
| Datensatznummer |
250006632
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| Publikation (Nr.) |
 copernicus.org/acp-9-93-2009.pdf |
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| Zusammenfassung |
| An aircraft measurement campaign involving the Russian
high-altitude aircraft M55 Geophysica and the German DLR Falcon
was conducted in Darwin, Australia in November and December 2005
as part of the European integrated project SCOUT-O3. The overall
objectives of the campaign were to study the transport of trace
gases through the tropical tropopause layer (TTL), mechanisms of
dehydration close to the tropopause, and the role of deep
convection in these processes. In this paper a detailed roadmap of
the campaign is presented, including rationales for each flight,
and an analysis of the local and large-scale meteorological
context in which they were embedded. The campaign took place
during the pre-monsoon season which is characterized by a
pronounced diurnal evolution of deep convection including a
mesoscale system over the Tiwi Islands north of Darwin known as
"Hector". This allowed studying in detail the role of deep
convection in structuring the tropical tropopause region, in situ
sampling convective overshoots above storm anvils, and probing the
structure of anvils and cirrus clouds by Lidar and a suite of in
situ instruments onboard the two aircraft. The large-scale flow
during the first half of the campaign was such that local flights,
away from convection, sampled air masses downstream of the "cold
trap" region over Indonesia. Abundant cirrus clouds enabled the
study of active dehydration, in particular during two TTL survey
flights. The campaign period also encompassed a Rossby wave
breaking event transporting stratospheric air to the tropical
middle troposphere and an equatorial Kelvin wave modulating
tropopause temperatures and hence the conditions for dehydration. |
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