Low ozone concentrations over Macquarie Island during 1997. Part I: trajectory analysis
Observations from both ground-based and satellite instruments show record low ozone column densities between 20°S and 60°S throughout 1997. The monthly averaged record from the Total Ozone Mapping Spectrometer (TOMS) indicates that measurements from 1997 are lower than both the TOMS climatological m...
| Main Authors: | , |
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| Format: | Text |
| Language: | English |
| Published: |
2000
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.542.1842 http://www.met.sjsu.edu/~cordero/research/Papers/macquarie_island_part1.pdf |
| Summary: | Observations from both ground-based and satellite instruments show record low ozone column densities between 20°S and 60°S throughout 1997. The monthly averaged record from the Total Ozone Mapping Spectrometer (TOMS) indicates that measurements from 1997 are lower than both the TOMS climatological mean (1979-1996) and measurements from 1998 and 1999 by up to 20 Dobson units. Macquarie Island ozonesonde data from 1997 are used to investigate the vertical structure of ozone variations during particular low ozone events observed in the southern middle latitudes. Analysis of three low ozone events over Macquarie Island are conducted during winter, spring and early summer using trajectory methods. Results suggest that low ozone events during 1997 are due to either vertical movements of the tropopause, tilting of the polar vortex, or in the case of early summer, remnants of the ozone hole. |
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