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Interpretation of high mixing ratios of O 3 observed in the upper troposphere over Syowa Station, Antarctica using a trajectory analysis
Author(s) -
Murayama Shohei,
Yamazaki Koji,
Nakazawa Takakiyo,
Aoki Shuji
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl00835
Subject(s) - troposphere , stratosphere , tropopause , atmospheric sciences , environmental science , climatology , polar night , geology
High O 3 mixing ratios were observed above 6 km over Syowa Station (SYO), Antarctica in mid‐September 1989 when the tropopause was found to be higher than 10 km. From the results of a 3‐dimensional trajectory analysis, it is suggested that the observed high O 3 was caused by vertical transport of O 3 from the lower stratosphere to the upper troposphere. To examine general features of the transport process associated with high O 3 mixing ratios observed in the upper troposphere over SYO, the same trajectory analysis was further performed for high O 3 observations at 350 hPa over SYO in 1987–1994. The results imply that the transport of stratospheric air descending in the polar region to SYO plays a very important role in the increase of upper tropospheric O 3 over SYO, especially in spring and autumn, while the downward transport of stratospheric O 3 in the circumpolar region is important in summer.