Solid particles in the tropical lowest stratosphereReport as inadecuate

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1 DMI - Danish Meteorological Institute 2 Institute for Atmospheric Science and Climate 3 Italian National Agency for New Technologies 4 Department of Physics and Astronomy Laramie 5 GSMA - Groupe de spectrométrie moléculaire et atmosphérique 6 IPSL - Institut Pierre-Simon-Laplace 7 IPMet - Instituto de Pesquisas Meteorológicas

Abstract : We report in situ and remote observations proving occasional occurrence of solid particles in the tropical lowest stratosphere, far away from deep convective events. The particles were found during field campaigns in Southeast Brazil 49.03 W 22.36 S. They occur in the altitude range from 17.5 to 20.8 km, at temperatures up to at least 10 K above the expected frost point temperature. While stability of ice particles at these altitudes is unexpected from a theoretical point of view, it is argued that these observations are indications of tropospheric air masses penetrating into the stratosphere during convective overshoots. It is concluded that the intrusion of tropospheric air must have carried a large amount of water with it, which effectively hydrated the lowest stratosphere, and consequently suppressed sublimation. This conclusion is further supported by a separate water vapor mixing ratio profile obtained at the same observation site.

Author: J. K. Nielsen - N. Larsen - F. Cairo - G. Di Donfrancesco - J. M. Rosen - G. Durry - G. Held - J. P. Pommereau -



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