Observational Study of the 4-Day Wave in the Mesosphere Preceding the Sudden Stratospheric Warming Event

Details Observational Study of the 4-Day Wave in the Mesosphere Preceding the Sudden Stratospheric Warming Event Observational Study of the 4-Day Wave in the Mesosphere Preceding the Sudden Stratospheric Warming Event

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa53a..03a&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA53A-03

Physics

3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Waves And Tides

Scientific paper

The winter polar stratosphere is characterized by an extensive vortex region that dynamically interacts with the winter mean flow. Under certain atmospheric conditions, when the mean winds in the high latitude winter stratosphere reverse from westerly to easterly, the polar vortex breaks down causing sudden stratospheric warmings (SSW). Earlier studies of the connection of SSW and mesosphere suggest mesospheric cooling trend preceding the stratospheric warming. It is expected that such a drastic change in the atmosphere will significantly alter the dynamical state of the mesosphere. In this study, we examine OH airglow temperature data from Eureka (80.0° N, 85.9° W), Resolute Bay (74.68° N, 94.90° W), and South Pole (90° S) for evidence of planetary wave activity during SSW events. Wavelet analyses of the temperature data show wave activity with a period of 4-day preceding the cooling in the mesosphere, which is followed by the stratosphere warming. We will also address the possible sourcing mechanisms for the generation of the 4-day wave that occurs before the onset of SSW.

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