The column amounts of NO2 have been measured using visible spectroscopy at Syowa Station, Antarctica (69°S), from March 1990. The NO2 slant column amounts at a solar zenith angle of 90° exhibits a large seasonal variation reaching the minimum value of 1 × 1016 cm-2 or less in midwinter, and it increases to the maximum value of 17 × 1016 cm-2 in midsummer. The recovery of NO2 in spring is 2-3 times slower than the fall decay. The observed temperature indicates that polar stratospheric clouds (PSCs) are expected to form from midwinter to early spring. A decrease in ozone was observed from early August and continued to the end of September, which is consistent with the observed depletion in NO2 during the same period. A chemical box model has been used to interpret quantitatively these observed results. -from Authors
CITATION STYLE
Kondo, Y. (1994). Ground-based measurements of column amounts of NO2 over Syowa Station, Antarctica. Journal of Geophysical Research, 99(D7). https://doi.org/10.1029/94jd00403
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