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James G. Anderson – 1992

October 8, 1992 @ 3:30 pm – 5:30 pm
Senate Chamber, N940, Ross Building, York University

Title: The Airborne Arctic Ozone Campaign of 1991 - 1992: What are the Conclusions?

Abstract: The United State executed an investigation of the mid and high latitude lower stratosphere using the high altitude NASA  ER-2  aircraft  for  in  situ  observations and the long range  DC-8 aircraft  for  remote  soundings. The campaign extended over an eight month period from August 1991 through March 1992 with deployments out of Fairbanks, Alaska; Bangor, Maine; and Mountain View, California.  The objectives of  the mission  address two questions:  (1)   Will  significant  ozone erosion  occur  within the  Arctic  vortex  in  the  next  ten  years  as  chlorine loading in the stratosphere approaches five ppbv?  (2) Which mechanisms are responsible for the observed ozone erosion poleward of 30N in the Winter/Spring northern hemisphere reported in satellite observations?
The presentation will focus on an interpretation of the results obtained from both aircraft with an emphasis on the observations that tested the processes controlling the loss rate of ozone at mid and  high latitudes of  the northern hemisphere.  The role of heterogeneous processes in controlling free radical concentrations, of the propensity of polar stratospheric clouds to repartition inorganic chlorine, the ordering of catalytic processes in the ozone loss budget and the theoretical tools for interpreting the new in situ results will be emphasized. Brochure

Updated on August 6th, 2014.