Morphology of the tropopause layer and lower stratosphere above a tropical cyclone : a case study on cyclone Davina (1999)

  • During the APE-THESEO mission in the Indian Ocean the Myasishchev Design Bureau stratospheric research aircraft M55 Geophysica performed a flight over and within the inner core region of tropical cyclone Davina. Measurements of total water, water vapour, temperature, aerosol backscattering, ozone and tracers were made and are discussed here in comparison with the averages of those quantities acquired during the campaign time frame. Temperature anomalies in the tropical tropopause layer (TTL), warmer than average in the lower part and colder than average in the upper TTL were observed. Ozone was strongly reduced compared to its average value, and thick cirrus decks were present up to the cold point, sometimes topped by a layer of very dry air. Evidence for meridional transport of trace gases in the stratosphere above the cyclone was observed and perturbed water distribution in the TTL was documented. The paper discuss possible processes of dehydration induced by the cirrus forming above the cyclone, and change in the chemical tracer and water distribution in the lower stratosphere 400–430 K due to meridional transport from the mid-latitudes and link with Davina. Moreover it compares the data prior and after the cyclone passage to discuss its actual impact on the atmospheric chemistry and thermodynamics.

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Author:Francesco Cairo, Carlo Buontempo, Robert A. MacKenzie, Cornelius SchillerGND, C.-Michael Volk, Alberto Adriani, Valentin Mitev, Renaud Matthey, Guido Di Donfrancesco, Alexey Oulanovsky, Fabrizio RavegnaniORCiD, Vladimir Yushkov, Marcel Snels, Chiara Cagnazzo, Leopoldo Stefanutti
Parent Title (English):Atmospheric chemistry and physics, 8.2008, S. 3411-3426
Publisher:European Geosciences Union
Place of publication:Katlenburg-Lindau
Document Type:Article
Date of Publication (online):2008/07/01
Date of first Publication:2008/07/01
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2008/10/06
Page Number:16
First Page:3411
Last Page:3426
© Author(s) 2008. This work is distributed under the Creative Commons Attribution 3.0 License.
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Licence (German):License LogoCreative Commons - Namensnennung 3.0