Kirstin Gleicher, Graduate Student
Department of Atmospheric Sciences
University of Illinois
“A vorticity based analysis of the Beaufort Anticyclone”
Date: Wednesday, September 8, 2010 (NOTE TIME CHANGE)
3:30 pm: Conversation and Cookies in Room 108 Atmospheric Sciences Building
4:00 pm: Seminar in Room 253 Mechanical Engineering Building (map)
The Beaufort Anticyclone is the dominant pressure feature over the Arctic Ocean and has a large influence on the surface wind regime and sea-ice motion. Sea level pressure (SLP) from the NCAR/NCEP Reanalysis is used to create a vorticity metric to investigate the spatial and temporal characteristics of the Beaufort Anticyclone from 1948-2008. Vorticity averaged over the Beaufort Anticyclone region shows the strongest relationship south of Alaska and north of Siberia. The spatial characteristics are investigated further by creating a timeseries of rapid change events, for which SLP changes show similar features south of Alaska and north of Siberia. Temporal characteristics are investigated using running means and spectral analysis, which show an annual cycle and greater energy in lower frequencies than in higher frequencies. The Beaufort Anticyclone vorticity metric is correlated with teleconnection index values. Pacific Ocean patterns such as the Pacific Decadal Oscillation and El Niño show a larger influence than the Atlantic patterns, contrary to past studies that show the Arctic Oscillation as a main driver over the Arctic. Correlations with the other teleconnection indices show considerable seasonality. For example, a significant correlation is found with the Pacific North American pattern in all seasons except summer.
Kirstin Gleicher received her Bachelor of Science in Meteorology from St. Cloud State University in 2008. Prior to attending the University of Illinois she interned with NASA Langley Research Center in the summer of 2007 studying Saharan dust outbreaks and their impacts on Tropical Cyclones. More recently she spent a portion of summer 2010 in Alaska for the International Arctic Research Center Summer School: Arctic in a Changing Climate, Physical and Biological Linkages to Permafrost.
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