Computer Science – Sound
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ijimw..16..907c&link_type=abstract
International Journal of Infrared and Millimeter Waves, Volume 16, Issue 5, pp.907-920
Computer Science
Sound
19
Scientific paper
We compare our previously reported measurements of South Pole 225 GHz atmospheric opacity, τ, to the column of precipitable water vapor ( PWV) which was derived from concurrent upper air soundings. From this comparison we found that τ=(2.8±0.1)×10-2+(6.9±0.2)×10-2× PWV with τ in units of nepers/airmass and PWV in units of mm of precipitable H2O. We compared our results to predictions from Grossman's AT atmospheric transparency model which is widely used in the radio astronomy community. The coefficient of the second term of the above relation, 0.069, was consistent with the predictions from the model; however, the first term, 0.028, which represents the dry air opacity, was about five to ten times larger than expected. Most of this discrepancy between the observed and the predicted dry air opacity can be accounted for by including contributions from continuum emission from N2 and O2 as is done in Liebe's MPM atmospheric model.
Bally John
Chamberlin Richard A.
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