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000028336 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000028336 1001_ $$0P:(DE-HGF)0$$aSantacesaria, V.$$b0
000028336 245__ $$aClouds at the tropical tropopause: a case study during the APE-THESEO campaign over the Western Indian Ocean
000028336 260__ $$aWashington, DC$$aWashington, DC$$bUnion$$bUnion$$c2003
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000028336 440_0 $$03369$$aJournal of Geophysical Research$$v108$$x0022-1406$$yD2
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000028336 520__ $$a[1] In this paper, we report a detailed description of a thin cirrus at the tropopause above a cumulonimbus (Cb) convective cluster observed during the Airborne Platform for Earth Observation-Third European Stratospheric Experiment for Ozone (APE-THESEO) campaign in February-March 1999 in the western Indian Ocean. The thin cirrus (Ci) has an optical depth at 532 nm below 0.1, with extended subvisible stretches, and is located directly below the tropopause, which was supersaturated with respect to ice. A direct comparison between the optical depth retrieved by Meteosat and that obtained by means of the hygrometers installed on the M55-Geophysica aircraft is discussed showing discrepancies ranging from 10 to 20%. Combining satellite and aircraft data, we show that the observed Ci is not due to cirrus outflow from Cb anvils. In the absence of any deeply convective clouds reaching altitudes above 15 km, we propose a possible mechanism of Ci formation based on a net mesoscale transport of water vapor from altitudes above 16 km to the tropopause region around 18 km. This transport could be driven by the critical layer and turbulence induced by gravity waves that could have been generated by lower level Cb cluster activity. The proposed mechanism for high-altitude Ci formation corroborates the new paradigm of a tropical tropopause layer (TTL) or "substratosphere,'' several kilometers thick, which is decoupled from the convection-dominated lower troposphere.
000028336 536__ $$0G:(DE-Juel1)FUEK257$$2G:(DE-HGF)$$aChemie und Dynamik der Geo-Biosphäre$$cU01$$x0
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000028336 650_7 $$2WoSType$$aJ
000028336 65320 $$2Author$$athin tropical cirrus
000028336 65320 $$2Author$$aAPE-THESEO campaign
000028336 65320 $$2Author$$atropical tropopause layer (TTL)
000028336 65320 $$2Author$$aconvective system
000028336 7001_ $$0P:(DE-HGF)0$$aCarla, R.$$b1
000028336 7001_ $$0P:(DE-HGF)0$$aMacKenzie, R.$$b2
000028336 7001_ $$0P:(DE-HGF)0$$aAdriani, A.$$b3
000028336 7001_ $$0P:(DE-HGF)0$$aCario, F.$$b4
000028336 7001_ $$0P:(DE-HGF)0$$adi Donfrancesco, G.$$b5
000028336 7001_ $$0P:(DE-HGF)0$$aKiemle, C.$$b6
000028336 7001_ $$0P:(DE-HGF)0$$aRedaelli, G.$$b7
000028336 7001_ $$0P:(DE-Juel1)VDB101$$aBeuermann, J.$$b8$$uFZJ
000028336 7001_ $$0P:(DE-Juel1)VDB1410$$aSchiller, C.$$b9$$uFZJ
000028336 7001_ $$0P:(DE-HGF)0$$aPeter, T.$$b10
000028336 7001_ $$0P:(DE-HGF)0$$aLuo, B.$$b11
000028336 7001_ $$0P:(DE-HGF)0$$aWernli, H.$$b12
000028336 7001_ $$0P:(DE-HGF)0$$aRavegnani, F.$$b13
000028336 7001_ $$0P:(DE-HGF)0$$aUlanovsky, A.$$b14
000028336 7001_ $$0P:(DE-HGF)0$$aYushkov, V.$$b15
000028336 7001_ $$0P:(DE-HGF)0$$aBalestri, S.$$b16
000028336 7001_ $$0P:(DE-HGF)0$$aStefanutti, L.$$b17
000028336 773__ $$0PERI:(DE-600)2016800-7$$a10.1029/2002JD002166$$gVol. 108, p. 4044$$p4044$$q108<4044$$tJournal of geophysical research / Atmospheres$$v108$$x0022-1406$$y2003
000028336 8567_ $$uhttp://dx.doi.org/10.1029/2002JD002166
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