Balloon Observations of Organic and Inorganic Chlorine in the Stratosphere The Role of HClO<sub>4</sub> Production on Sulfate Aerosols
نویسنده
چکیده
Simultaneous observations of stratospheric organic and inorganic chlorine were made in September 1993 out of Fort Sumner, New Mexico, using the JPL balloon-borne MkIV interferometer. Between 15 and 20 km, a significant fraction (20 60%) of the inorganic hlorine could not be accounted for by the sum of measured HC1, C1ONO2, and HOC1. Laboratory measurements of the reaction of C10 radicals on sulfuric acid solutions have indicated that, along with HC1, small amounts of perchloric acid, HC104, were formed. Very little is known about the fate of HC10 4 in the stratosphere and we use a photochemical box model to determine the impact of this new species on the partitioning of inorganic hlorine in the stratosphere. Assuming that HC104 is photochemically stable, it is shown that in the enhanced aerosol loading conditions resulting from Mr. Pinatubo's eruption, HC104 could represent a significant reservoir of chlorine in the lower stratosphere, sequestering up to 0.2 ppbv (or 50%) of the total inorganic chlorine at 16 km. The occurrence of this new species could bring to closure the inorganic chlorine budget deficiency made apparent by recent ER-2 aircraft in situ measurements of HC1.
منابع مشابه
Balloon observations of organic and inorganic chlorine in the stratosphere: the role of HClO4 production on sulfate aerosols.
Simultaneous observations of stratospheric organic and inorganic chlorine were made in September 1993 out of Fort Sumner, New Mexico, using JPL balloon-borne MkIV interferometer. Between 15 and 20 km, a significant fraction (20-60%) of the inorganic chlorine could not be accounted for by the sum of measured HCl, ClONO2, and HOCl. Laboratory measurements of the reaction of ClO radicals on sulf...
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