Partitioning between chlorine reservoir species deduced from observations in the Arctic winter stratosphere

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作者：

Forschungszentrum Jülich, Inst. fur Stratospharische Chem., Jülich, Germany ^{[1
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不详 ^{[2
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不详 ^{[3
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来源：

J. ATMOS. CHEM. | / 2卷 / 107-126期

关键词：

Air mass - Anticorrelation - Arctic latitude - Chlorine partitioning - Midlatitudes - Mixing ratios - Polar process - Polar vortex - Simultaneous observation - Source gas;

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摘要：

Simultaneous observations of several chlorine source gases, as well as HCl and ClO, have been performed in the Arctic stratosphere on 1 and 9 February 1994, using balloon-borne instrumentation as a contribution to SESAME (Second European Stratospheric Arctic and Mid latitude Experiment). The observed mixing ratios of HCl and N2O show a clear anticorrelation. No severe loss of HCl was observed inside the vortex during our measurement. These measurements showed that during this period at 20 km and above, HCl was either in excess, or at least as abundant, as ClONO2 and comprised between 50 and 70% of the available chlorine, Cl(y). On 1 February, measurements were made inside the polar vortex. The air mass sampled on this day showed a clear signature of diabatic descent, and also enhanced levels of ClO with a maximum of 230 pptv at 22.5 km. A 10 day backward trajectory analysis showed that these air masses had passed a large region of low temperatures a few hours prior to the measurement. Temperatures along the back trajectory at the 475 K and 550 K levels (20.1 and 23.7 km respectively) were cold enough for heterogeneous chlorine activation to occur, in agreement with the observed elevated ClO mixing ratios.

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