Abstract
Ground‐based, thermal emission measurements of the cold, clear sky have been made showing the ν3 fundamental emission band of carbon tetrachloride (CCl4) which is located in the 786–806 cm−1 region. A spectrum of the non‐CCl4 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 CCl4 thermal emission band from the atmospheric emission spectrum. A tropospheric CCl4 mixing ratio of 170±30 pptv was determined from these measurements. In addition, the downward long‐wave flux associated with the ν3 emission band of CCl4 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.
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