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| Titel |
An overview of the HIBISCUS campaign |
| VerfasserIn |
J.-P. Pommereau, A. Garnier, G. Held, A. M. Gomes, F. Goutail, G. Durry, F. Borchi, A. Hauchecorne, N. Montoux, P. Cocquerez, G. Letrenne, F. Vial, A. Hertzog, B. Legras, I. Pisso, J. A. Pyle, N. R. P. Harris, R. L. Jones, A. D. Robinson, G. Hansford, L. Eden, T. Gardiner, N. Swann, B. Knudsen, N. Larsen, J. K. Nielsen, T. Christensen, F. Cairo, F. Fierli, M. Pirre, V. Marecal, N. Huret, E. D. Rivière, H. Coe, D. Grosvenor, K. Edvarsen, G. Donfrancesco, P. Ricaud, J.-J. Berthelier, M. Godefroy, E. Seran, K. Longo, S. Freitas |
| 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 ; 11, no. 5 ; Nr. 11, no. 5 (2011-03-15), S.2309-2339 |
| Datensatznummer |
250009461
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| Publikation (Nr.) |
 copernicus.org/acp-11-2309-2011.pdf |
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| Zusammenfassung |
The EU HIBISCUS project consisted of a series of field campaigns during the
intense convective summers in 2001, 2003 and 2004 in the State of São
Paulo in Brazil. Its objective was to investigate the impact of deep
convection on the Tropical Tropopause Layer (TTL) and the lower stratosphere
by providing a new set of observational data on meteorology, tracers of
horizontal and vertical transport, water vapour, clouds, and chemistry in
the tropical Upper Troposphere/Lower Stratosphere (UT/LS). This was
achieved using short duration research balloons to study local phenomena
associated with convection over land, and long-duration balloons
circumnavigating the globe to study the contrast between land and oceans.
Analyses of observations of short-lived tracers, ozone and ice particles
show strong episodic local updraughts of cold air across the lapse rate
tropopause up to 18 or 19 km (420–440 K) in the lower stratosphere by
overshooting towers. The long duration balloon and satellite measurements
reveal a contrast between the composition of the lower stratosphere over
land and oceanic areas, suggesting significant global impact of such events.
The overshoots are shown to be well captured by non-hydrostatic meso-scale
Cloud Resolving Models indicating vertical velocities of 50–60 m s−1 at the
top of the Neutral Buoyancy Level (NBL) at around 14 km, but, in contrast,
are poorly represented by global Chemistry-Transport Models (CTM) forced by
Numerical Weather Forecast Models (NWP) underestimating the overshooting
process. Finally, the data collected by the HIBISCUS balloons have allowed a
thorough evaluation of temperature NWP analyses and reanalyses, as well as
satellite ozone, nitrogen oxide, water vapour and bromine oxide measurements
in the tropics. |
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