Journal
ATMOSPHERIC RESEARCH
Volume 89, Issue 1-2, Pages 170-180Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2007.11.031
Keywords
convective storms; cloud top microphysics; stratospheric moisture; tropopause
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Past studies using a variety of satellite instruments have demonstrated the possibility of detecting lower stratospheric water vapor against a cold background of deep convective storm tops. The method is based on the brightness temperature difference (BTD) between the water vapor absorption and infrared window bands, assuming a thermal inversion above the cloud top level. This paper confirms the earlier studies, documenting positive BTD values between the 6.2 mu m and 10.8 mu m bands in Meteosat Second Generation (MSG) Spinning Enhanced Visible and InfraRed Imager (SEVIRI) imagery above tops of deep convective storms over Europe. The observed positive BTD values for a case from 28 June 2005 are compared to calculations from a radiative transfer model, and possible reasons for their existence are discussed. A localized increase in positive BTD is observed at the later stages of storm evolution, and this increase is likely a signal of water vapor being transported by this particular storm from the troposphere into the lower stratosphere. (C) 2008 Elsevier B.V. All rights reserved.
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