Interannual variability of the spring transition date in the MLT region observed with meteor radar at Obninsk (55°N, 37°E)

Details Interannual variability of the spring transition date in the MLT region observed with meteor radar at Obninsk (55°N, 37°E) Interannual variability of the spring transition date in the MLT region observed with meteor radar at Obninsk (55°N, 37°E)

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jastp..77..113m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 77, p. 113-118.

Physics

Scientific paper

A statistical analysis is performed on the interannual variability of the spring transition date in the mesosphere/lower thermosphere (MLT) region. We have analysed daily prevailing zonal winds obtained at Obninsk (55°N, 37°E) with meteor radar for the period from 1973 to 2011. The date is defined as the day when the prevailing zonal wind preliminary filtered with the 27-point Hamming filter crosses the zero level. Significant correlations between the interannual variability of the spring date and the variability of the Northern annular mode (-0.57) and between the interannual variability of the spring date and the stratospheric polar vortex breakup date (-0.66 under the westerly quasi-biennial winds at 10 hPa) witness the vertical coupling between the MLT region and stratosphere through the wave activity. A comparison with the variability of the zonal mean zonal gradient wind estimated from temperature measurements by MLS aboard the AURA satellite is provided.

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