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Water Vapour and Ozone Profiles in the Midlatitude Upper Troposphere : Volume 4, Issue 6 (15/12/2004)

By Vaughan, G.

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Book Id: WPLBN0003989953
Format Type: PDF Article :
File Size: Pages 23
Reproduction Date: 2015

Title: Water Vapour and Ozone Profiles in the Midlatitude Upper Troposphere : Volume 4, Issue 6 (15/12/2004)  
Author: Vaughan, G.
Volume: Vol. 4, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Phillips, A. W., Dean, L., Cambridge, C., & Vaughan, G. (2004). Water Vapour and Ozone Profiles in the Midlatitude Upper Troposphere : Volume 4, Issue 6 (15/12/2004). Retrieved from

Description: Institute of Mathematical and Physical Sciences, University of Wales, Aberystwyth, UK. We present an investigation of upper tropospheric humidity profiles measured with a standard radiosonde, the Vaisala RS80-A, and a commercial frost-point hygrometer, the Snow White. Modifications to the Snow White, to enable the mirror reflectivity and Peltier cooling current to be monitored during flight, were found to be necessary to determine when the instrument was functioning correctly; a further modification to prevent hydrometeors entering the inlet was also implemented. From 23 combined flights of an ozonesonde, radiosonde and Snow White between September 2001 and July 2002, clear agreement was found between the two humidity sensors, with a mean difference of <2% in relative humidity from 2 to 10 km, and 2.2% between 10 and 13 km. This agreement required a correction to the radiosonde humidity, as described by Miloshevich et al. (2001). Using this result, the dataset of 324 ozonesonde/RS80-A profiles measured from Aberystwyth between 1991 and 2002 was examined to derive statistics for the distribution of water vapour and ozone. Supersaturation with respect to ice was frequently seen at the higher levels – 24% of the time in winter between 8 and 10 km. The fairly uniform distribution of relative humidity persisted to 120% in winter, but decreased rapidly above 100% in summer.

Water vapour and ozone profiles in the midlatitude upper troposphere


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