Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31b1728c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA31B-1728
Physics
[0341] Atmospheric Composition And Structure / Middle Atmosphere: Constituent Transport And Chemistry, [0342] Atmospheric Composition And Structure / Middle Atmosphere: Energy Deposition
Scientific paper
Multiple stratospheric sudden warming (SSW) events have been spontaneously generated in simulations of the period between 1953-2006 by the Whole Atmosphere Community Climate Model (WACCM). These SSWs include extreme events where the polar vortex breaks down throughout the stratosphere and an elevated stratopause reforms at a high altitude. Several such events have recently been documented in the Arctic winter. While the SSW is triggered by breaking planetary waves, the role of gravity waves in the formation of the elevated stratopause, reformation of the polar vortex, and coupling between the stratosphere, mesosphere, and lower thermosphere remains a topic of current research. In this study we analyze the general circulation and dynamics of the mesosphere during both winters with extreme warming events and those with minor warming events. The dynamics of the free-running WACCM simulations are compared with WACCM simulations for the period between January 2004 to December 2007 that are forced up to 40 km with assimilated data from the Goddard Earth Observing system Model version 5 (GEOS-5). We quantify the longitudinal variations in the meridional and zonal circulation and wave-forcing of the model simulations and assess the relative contributions of planetary and gravity waves to the circulation during these events. We also determine the frequency of occurrence of SSW events and elevated stratopause events over the 53 winters in the free running version of WACCM and assess the inter-annual variability in the polar circulation.
Chandran Anushya
Collins Richard L.
Garcia Rafael
Marsh Daniel R.
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