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A measurement of the greenhouse radiation associated with carbon tetrachloride (CCl 4 )
Author(s) -
Evans W. F. J.,
Puckrin E.
Publication year - 1996
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 - 10.1029/96gl01258
Subject(s) - carbon tetrachloride , radiosonde , flux (metallurgy) , atmospheric sciences , emission spectrum , radiation , troposphere , environmental science , materials science , mixing ratio , humidity , analytical chemistry (journal) , meteorology , chemistry , spectral line , environmental chemistry , physics , optics , organic chemistry , astronomy , metallurgy
Ground‐based, thermal emission measurements of the cold, clear sky have been made showing the ν 3 fundamental emission band of carbon tetrachloride (CCl 4 ) which is located in the 786–806 cm −1 region. A spectrum of the non‐CCl 4 background emission features has been simulated using the FASCD3P line‐by‐line radiation code with measured radiosonde parameters of pressure, temperature and humidity. The simulated spectrum has been used to extract the CCl 4 thermal emission band from the atmospheric emission spectrum. A tropospheric CCl 4 mixing ratio of 170±30 pptv was determined from these measurements. In addition, the downward long‐wave flux associated with the ν 3 emission band of CCl 4 measured at the surface has been estimated to be 0.09 W/m² with an uncertainty of 15–20%. This flux is about one third and one fifth of that corresponding to the chlorofluorocarbons CFC‐11 and CFC‐12, respectively.