Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa44a..03h&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA44A-03
Astronomy and Astrophysics
Astrophysics
[0341] Atmospheric Composition And Structure / Middle Atmosphere: Constituent Transport And Chemistry, [1650] Global Change / Solar Variability, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle, [7537] Solar Physics, Astrophysics, And Astronomy / Solar And Stellar Variability
Scientific paper
Stratospheric anticyclones are broken planetary waves that occur in conjunction with sudden stratospheric warming (SSW) events. This work will use 45 years of ERA-40 re-analysis data and output from a 50-year simulation of the Whole Atmosphere Community Climate Model to explore changes in stratospheric and mesospheric anticyclones during solar max vs. solar min. It is known that, in the Arctic winter, more SSWs occur during solar max if the years are separated by the phase of the tropical Quasi-biennial Oscillation (QBO). Since SSWs and anticyclones go hand-in-hand, it is our hypothesis that stratospheric anticyclones are stronger, spatially larger, vertically deeper, and/or occur more frequently during solar max. The historical definition of SSWs is based on zonal mean temperature and zonal wind fields at 10 hPa, thus SSWs at higher altitudes are not identified using this definition. An alternative definition of SSWs will be proposed that is a function of altitude and is based on anticyclone characteristics instead of zonal mean quantities. This new SSW definition will then be used to explore coupling between stratospheric and mesospheric anticyclones, the QBO, and the solar cycle.
Collins Richard L.
Garcia Rafael
Harvey Vanessa
Randall Cora E.
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