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000007885 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000007885 1001_ $$0P:(DE-Juel1)VDB1410$$aSchiller, C.$$b0$$uFZJ
000007885 245__ $$aHydration and dehydration at the tropical tropopause
000007885 260__ $$aKatlenburg-Lindau$$bEGU$$c2009
000007885 300__ $$a9647 - 9660
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000007885 440_0 $$09601$$aAtmospheric Chemistry and Physics$$v9$$x1680-7316$$y24
000007885 500__ $$aDiscussion of the results and developing ideas of their meaning with many members of the project teams of SCOUT-O3, TroCCiNOx and AMMA/SCOUT-O3 is gratefully acknowledged. We thank MDB, DLR and ERS-Ltd operating and managing the aircraft under the challenging tropical conditions. The study was primarily conducted under the SCOUT-O3 Integrated Project (EC Contract GOCE-CT-2004-505390), with additional campaign funding by the EC projects TroCCiNOx and AMMA as well as by INSU and the Geophysica EEIG.
000007885 520__ $$aHigh-resolution water measurements from three tropical airborne missions in Northern Australia, Southern Brazil and West Africa in different seasons are analysed to study the transport and transformation of water in the tropical tropopause layer (TTL) and its impact on the stratosphere. The mean profiles are quite different according to the season and location of the campaigns, with lowest mixing ratios below 2 ppmv at the cold point tropopause during the Australian mission in November/December and high TTL mixing ratios during the African measurements in August. We present backward trajectory calculations considering freeze-drying of the air to the minimum saturation mixing ratio and initialised with climatological satellite data. This trajectory-based reconstruction of water agrees well with the observed H2O average profiles and therefore demonstrates that the water vapour set point in the TTL is primarily determined by the Lagrangian saturation history. Deep convection was found to moisten the TTL, in several events even above the cold point up to 420 K potential temperatures. However, our study does not provide evidence for a larger impact of these highly-localised events on global scales.
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000007885 7001_ $$0P:(DE-Juel1)129122$$aGrooß, J.-U.$$b1$$uFZJ
000007885 7001_ $$0P:(DE-Juel1)129130$$aKonopka, P.$$b2$$uFZJ
000007885 7001_ $$0P:(DE-Juel1)129141$$aPlöger, F.$$b3$$uFZJ
000007885 7001_ $$0P:(DE-HGF)0$$aSilva dos Santos, F.H.$$b4
000007885 7001_ $$0P:(DE-Juel1)129155$$aSpelten, N.$$b5$$uFZJ
000007885 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-9-9647-2009$$gVol. 9, p. 9647 - 9660$$p9647 - 9660$$q9<9647 - 9660$$tAtmospheric chemistry and physics$$v9$$x1680-7316$$y2009
000007885 8567_ $$uhttp://dx.doi.org/10.5194/acp-9-9647-2009
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