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An observation of the atmospheric thermal emission spectrum of trichlorofluoromethane (CFC‐11)
Author(s) -
Evans W. F. J.,
Puckrin E.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl02479
Subject(s) - radiance , emission spectrum , zenith , environmental science , thermal emission , flux (metallurgy) , spectral line , atmospheric sciences , thermal , sky , line (geometry) , physics , meteorology , materials science , optics , astronomy , geometry , mathematics , metallurgy
Ground‐based measurements of the thermal emission from the clear zenith sky have been made which clearly show the ν 4 band of CFC‐11 (or CCl 3 F). An atmospheric water spectrum has been derived from these measurements and used to subtract the water emission features from the thermal emission spectra. These observations have been compared to line‐by‐line atmospheric radiance calculations using the FASCD3P algorithm. The agreement of the atmospheric CFC‐11 emission band between the simulated result and the observed water‐subtracted result is good. From these measurements the total downward greenhouse flux from the CFC‐11 ν 4 emission band has been found to be 0.25 W/m² ± 10%.