Abstract
We have measured middle and upper stratospheric HCN using ground‐based mm‐wave emission spectroscopy, during a series of observations made in Mauna Kea, Hawaii, in June of 1986. We find a volume mixing ratio of 190±40 pptv at ∼40 km, and a decrease of concentration with altitude that is considerably slower than that predicted by current models. This could be an indication of an atmospheric source of HCN as yet unidentified.
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