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The stratospheric H 2 O mixing ratio profile in the 10‐24 km altitude range is derived from in‐situ measurements, using a new technique: OH fluorescence produced when H 2 O molecules are photodissociated by a V.U.V. light source. The flight instrument and its calibration are described in some details. A decrease of the mixing ratio is observed below 24 km, down to 21 km. The stratospheres‐troposphere transition shows vertical structure.
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Bertaux et al. (1978) studied this question.
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