Measurements of the mean, solar-fixed temperature and cloud structure of the middle atmosphere of Venus

Details Measurements of the mean, solar-fixed temperature and cloud structure of the middle atmosphere of Venus Measurements of the mean, solar-fixed temperature and cloud structure of the middle atmosphere of Venus

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983qjrms.109...57s&link_type=abstract

Royal Meteorological Society, Quarterly Journal (ISSN 0035-9009), vol. 109, Jan. 1983, p. 57-80. Research supported by the Scien

Computer Science

Sound

51

Atmospheric Sounding, Atmospheric Temperature, Cloud Cover, Venus Atmosphere, Venus Clouds, Infrared Radiometers, Middle Atmosphere, Pioneer Venus 1 Spacecraft, Temperature Distribution, Temperature Profiles

Scientific paper

Results are presented for the climatological mean temperature structure of the Venusian atmosphere, obtained by the Pioneer Venus orbiter IR radiometer, from the cloud tops to the 105 km level. A strong dependence is noted on latitude and local time of day, although day-to-day variations are also seen. Attention is given to the retrieval scheme and the derivation of the weighting functions characterizing the vertical response of each of the five radiometer channels used. The Venus middle atmosphere is divisible into two distinct regions separated by a low latitude temperature minimum of less than 170 K at 95 km in the retrieved zonal-mean temperature field. Fourier analysis shows that within 45 deg of the equator, the longitudinal variation of temperature is dominated by a wavenumber-2 tidal structure whose phase moves eastward with increasing altitude. Retrievals are insensitive to cloud structure in the polar regions, and the cool collar surrounding the warm polar region is a deep temperature inversion in which temperatures can be more than 30 K less than equatorial values at the same level.

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