Sudden Stratospheric Warming events’ impacts on the mesopause region temperature, zonal meridional winds over midlatitude region by CSU Na lidar

Details Sudden Stratospheric Warming events’ impacts on the mesopause region temperature, zonal meridional winds over midlatitude region by CSU Na lidar Sudden Stratospheric Warming events’ impacts on the mesopause region temperature, zonal meridional winds over midlatitude region by CSU Na lidar

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa53a1239y&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA53A-1239

Physics

Geophysics

[0933] Exploration Geophysics / Remote Sensing, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

Sudden Stratospheric Warming (SSW) event is considered the most dramatic meteorological event in the stratosphere, accompanied by a rise of stratospheric temperature and slowing down or even reverse of polar vortex during the northern hemispheric winter. In this poster, CSU Na lidar (41°N, 105°W) observations during some major warming events of the past few years are investigated to diagnose the SSW impacts on the midlatitude mesopause region (80-110 km) temperature, zonal wind, and meridional wind. During the SSW events, the cooling within lower part of mesopause region (below 85 km) is observed to accompany slowing (January 2008) down or reverse (January 2009) of zonal wind. Using full diurnal cycle observations by CSU Na lidar, the SSW effects on the tidal wave modulations of temperature and winds will also be investigated. We found the semidiurnal tidal amplitudes are enhanced significantly during the major warming event. At the same time, dramatic increasing of zonal and meridional wind diurnal tidal amplitudes are also found below 85 km during SSW events. Such study shows that SSW events can stretch its impacts into the midlatitude mesopause region and change the atmospheric parameters within.

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