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000032491 1001_ $$0P:(DE-HGF)0$$aLuo, B. P.$$b0
000032491 245__ $$aUltrathin tropical tropopause clouds (UTTCs) II: stabilization  mechanism
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000032491 440_0 $$09601$$aAtmospheric Chemistry and Physics$$v3$$x1680-7316
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000032491 520__ $$aMechanisms by which subvisible cirrus clouds (SVCs) might contribute to dehydration close to the tropical tropopause are not well understood. Recently Ultrathin Tropical Tropopause Clouds (UTTCs) with optical depths around 10(-4) have been detected in the western Indian ocean. These clouds cover thousands of square kilometers as 200-300 m thick distinct and homogeneous layer just below the tropical tropopause. In their condensed phase UTTCs contain only 1-5% of the total water, and essentially no nitric acid. A new cloud stabilization mechanism is required to explain this small fraction of the condensed water content in the clouds and their small vertical thickness. This work suggests a mechanism, which forces the particles into a thin layer, based on upwelling of the air of some mm/s to balance the ice particles, supersaturation with respect to ice above and subsaturation below the UTTC. In situ measurements suggest that these requirements are fulfilled. The basic physical properties of this mechanism are explored by means of a single particle model. Comprehensive 1-D cloud simulations demonstrate this stabilization mechanism to be robust against rapid temperature fluctuations of +/-0.5 K. However, rapid warming (DeltaT>2 K) leads to evaporation of the UTTC, while rapid cooling (DeltaT<2 K) leads to destabilization of the particles with the potential for significant dehydration below the cloud.
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000032491 7001_ $$0P:(DE-HGF)0$$aPeter, Th.$$b1
000032491 7001_ $$0P:(DE-HGF)0$$aWernli, H.$$b2
000032491 7001_ $$0P:(DE-HGF)0$$aFlüglistaler, S.$$b3
000032491 7001_ $$0P:(DE-HGF)0$$aWirth, M.$$b4
000032491 7001_ $$0P:(DE-HGF)0$$aKiemle, C.$$b5
000032491 7001_ $$0P:(DE-HGF)0$$aFlentje, H.$$b6
000032491 7001_ $$0P:(DE-HGF)0$$aYushkov, V. A.$$b7
000032491 7001_ $$0P:(DE-HGF)0$$aKhattatov, V.$$b8
000032491 7001_ $$0P:(DE-Juel1)VDB8778$$aRudakov, V.$$b9$$uFZJ
000032491 7001_ $$0P:(DE-HGF)0$$aThomas, A.$$b10
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000032491 7001_ $$0P:(DE-HGF)0$$aToci, G.$$b12
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000032491 7001_ $$0P:(DE-Juel1)VDB101$$aBeuermann, J.$$b14$$uFZJ
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000032491 7001_ $$0P:(DE-HGF)0$$aCairo, F.$$b16
000032491 7001_ $$0P:(DE-HGF)0$$adi Donfrancesco, G.$$b17
000032491 7001_ $$0P:(DE-HGF)0$$aAdriani, A.$$b18
000032491 7001_ $$0P:(DE-HGF)0$$aVolk, C. M.$$b19
000032491 7001_ $$0P:(DE-HGF)0$$aStrom, J.$$b20
000032491 7001_ $$0P:(DE-HGF)0$$aNoone, K.$$b21
000032491 7001_ $$0P:(DE-HGF)0$$aMitev, V.$$b22
000032491 7001_ $$0P:(DE-HGF)0$$aMacKenzie, R. A.$$b23
000032491 7001_ $$0P:(DE-HGF)0$$aCarslaw, K. S.$$b24
000032491 7001_ $$0P:(DE-HGF)0$$aTrautmann, T.$$b25
000032491 7001_ $$0P:(DE-HGF)0$$aSantacesaria, V.$$b26
000032491 7001_ $$0P:(DE-HGF)0$$aStefanutti, L.$$b27
000032491 773__ $$0PERI:(DE-600)2069847-1$$gVol. 3, p. 1093 - 1100$$p1093 - 1100$$q3<1093 - 1100$$tAtmospheric chemistry and physics$$v3$$x1680-7316$$y2003
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