CASPO Seminar: Charlie Kennel & Elena Yulaeva (SIO), "Arctic Sea Ice, Atmospheric Plumes, and ENSO"


 
04/18/2018 - 3:30pm
Location: 
Nierenberg Hall 101

Here we assess the hypothesis that Arctic Ocean warming due to seasonal sea ice retreat generates rising atmospheric “plumes” that couple via high-altitude transport to El Nino Southern Oscillation (ENSO) processes. Calculations of static stability using observational data indicate that plumes are generated over opened ocean areas in early fall. Regression on September sea ice area generates three telecommunication structures in the upper troposphere whose senses of circulation alternate.  By December, these extend from the Arctic across the Pacific to the Inter-Tropical Convergence Zone (ITCZ), where they couple to tropical trade winds.  Inter-annual September sea ice change produces a dipolar pattern of December trade wind adjustments in the Central and Eastern Pacific that is observed in the present era of sea ice retreat. Regression detects an array of turbulent interactions at the ITCZ that are attributable to the arrival of the upper troposphere disturbances created by seasonal sea ice retreat. Ocean-atmosphere energy exchange there could amplify the remote impacts of sea ice retreat, which may include modifying the Aleutian Low Circulation in the North Pacific. The Arctic Plume scenario accounts for its winter timing and the sense of its inter-annual changes. 

For more information on this event, contact: 
Theresa Morrison
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