Coupling of sudden stratospheric warmings up to the mesosphere and lower thermosphere.

Details Coupling of sudden stratospheric warmings up to the mesosphere and lower thermosphere. Coupling of sudden stratospheric warmings up to the mesosphere and lower thermosphere.

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa74a..01s&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA74A-01

Mathematics

Logic

0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics

Scientific paper

One of the most dramatic meteorological perturbations in the middle atmosphere is the sudden stratospheric warming (SSW). This usually occurs at least once per Northern winter and can result in large (up to 50K) temperature increases, wind reversals and hemispheric transport perturbations. It is now understood that the effects of SSWs resonate up to much higher altitudes, including the mesosphere (up to 90 km) and possibly even the thermosphere (above 90 km). However the actual manifestation of these SSWs on the mesospheric and lower thermospheric temperature structure remains uncertain, with different models yielding different answers, probably related to the treatment of gravity waves. We examine this question with the Navy's operational forecast system which has been extended up to the lower thermosphere. This model, NOGAPS- ALPHA (Advanced Level Physics High Altitude) has been used to perform several case studies of different SSW events over the last several years. The results will be compared with observations from two NASA satellites, TIMED and AURA, both of which are measuring the temperature from the stratosphere to the lower thermosphere. Two events will be emphasized and compared. The first is the unusual and prolonged disturbance of January-February 2006. The second is the shorter minor warming of 2008. Both SSW's had effects which resonated to high altitudes, but they were very different in their specific manifestations.

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