HR: 0800h
AN: A21B-0724    [Abstracts]
TI: Climatology and origin of small-scale vertical structures of ozone in the lower stratosphere
AU: * Noguchi, K
EM: nogu@eorc.jaxa.jp
AF: The Earth Observation Research and Application Center, Japan Aerospace Exploration Agency, Harumi Island Triton Square Office Tower X 23F 1-8-10 Harumi, Chuo-ku, Tokyo, 104-6023 Japan
AU: Imamura, T
EM: ima@isas.jaxa.jp
AF: Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1, Yoshinodai, Sagamihara, 229-8510 Japan
AU: Oyama, K
EM: oyama@isas.jaxa.jp
AF: Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1, Yoshinodai, Sagamihara, 229-8510 Japan
AU: Bodeker, G
EM: g.bodeker@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, Lauder, 85 New Zealand
AB: To understand the mechanism of small-scale advection in the stratosphere which is not resolved by assimilated meteorological data, the climatology and origin of vertical structures (vertical wavelength $<$ 2 km) in stratospheric ozone profiles are investigated by using the global data of routine ozonesonde observations. Vertical structures of ozone in the lower stratosphere can be attributed to either vertical advection or horizontal advection. A useful method to distinguish between them is to evaluate the correlation between the fluctuations of ozone mixing ratio and potential temperature. Positive correlation indicates that vertical advection is responsible for the ozone fluctuation, while no correlation means that horizontal advection is responsible for the ozone fluctuation. It was found that the correlation increases with decreasing latitude in both hemispheres and there exists a distinct seasonal variation in the correlation in the mid-latitude with a maximum in late summer and a minimum in late winter. The cause of the seasonal variation was inferred from the seasonal variations of the correlation coefficient, the ozone fluctuation amplitude and the gravity wave activity. The results show that horizontal advection becomes active and overwhelms vertical advection in late winter, thereby lowering the correlation in this season.
DE: 3329 Mesoscale meteorology
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3384 Waves and tides
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting