Other
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252.1293b&link_type=abstract
Science (ISSN 0036-8075), vol. 252, May 31, 1991, p. 1293-1296. Research supported by NASA and University of Hawaii.
Other
24
Emission Spectra, Near Infrared Radiation, Venus Atmosphere, Water Vapor, Atmospheric Attenuation, Carbon Dioxide, Imaging Techniques, Spectral Resolution
Scientific paper
Near-infrared spectra of a bright and a dark thermal emission feature on the night side of Venus have been obtained from 2.2 to 2.5 microns at a spectral resolution of 1200 to 1500. Both bright and dark features show numerous weak absorption bands produced by CO2, CO, water vapor, and other gases. The bright feature emits more radiation than the dark feature throughout this spectral region, but the largest contrasts occur between 2.21 s 2.32 microns, where H2SO4 clouds and a weak CO2 band provide the only known sources of extinction. The contrast decreases by 55 to 65 percent at wavelengths longer than 2.34 microns, where CO, clouds, and water vapor also absorb and scatter upwelling radiation. This contrast reduction may provide direct spectroscopic evidence for horizontal variations in the water vapor concentrations in the Venus atmosphere at levels below the cloud tops.
Bell James Francis III
Crisp Dave
Lucey Paul G.
Ozoroski T. A.
Sinton William M.
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