Vertical Propagation of Gravity Waves in the Middle and Upper Atmosphere

Details Vertical Propagation of Gravity Waves in the Middle and Upper Atmosphere Vertical Propagation of Gravity Waves in the Middle and Upper Atmosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa31b1968s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA31B-1968

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [3334] Atmospheric Processes / Middle Atmosphere Dynamics

Scientific paper

In order to investigate vertical propagation of gravity waves from the lower to the upper atmosphere, combined measurements with an airglow imager and lidars were carried out at the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) station (69.3N, 16.0E) in northern Norway. Airglow imaging reveals two-dimensional structures of gravity waves in the mesopause region, while the ALOMAR Rayleigh/Mie/Raman (RMR) lidar and sodium lidar provide the vertical structures covering from the stratosphere to the lower thermosphere. On 26 November 2010, the imager identified a mesoscale gravity wave structure in the sodium airglow, which had a horizontal wavelength of 290 km, wave period of 59.1 min and propagated northeastward at a phase speed of 82 m/s. Simultaneous lidar measurements also showed the upward wave signatures with a similar wave period in the temperature perturbations. In the vicinity of the airglow height, the vertical wavelengths derived from the lidar data were consistent with those estimated from the dispersion relation of gravity waves using the airglow results. A ray-tracing analysis suggests that the observed gravity wave was generated from a distortion of the polar jet at the tropopause through the geostrophic adjustment.

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