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Integration of these data has helped us toДescribe pollution plumes from wildfires on a wide spectrum of temporalДЄnd spatial scales. Pico Mountain Atmospheric Observatory in the Azores, and coordinated University of Toronto, enhanced ozonesonde launches, measurements on the Measurements at the Dalhousie University Ground Station (DGS) and the Two-week deployment of the UK BAe-146-301 Atmospheric Research Aircraft The central focus of the experiment was a Products from seasonal boreal wildfires, and how they impact downwindДЄtmospheric composition. Understanding the chemical aging of airmasses, containing the emission Impact of BOReal forest fires on Tropospheric oxidants using AircraftДЄnd Satellites) experiment, which has the overarching objective of We describe the design and execution of the BORTAS (Quantifying the

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Finally, a 2.5-yr time series of monthly mean stratospheric ozone columns agrees within 3% with those retrieved from Optical Spectrograph and Infrared Imager System (OSIRIS) measurements on board the Odin satellite, which is within the errors of both measurement platforms. During this exercise, average differences between total columns retrieved from the same spectra by different users were below 2.1% for O 3, HCl, and N 2 O in the blind phase, and below 1% in the open phase, when all retrieval constraints were identical. In March 2004, after participating in a retrieval algorithm user intercomparison exercise, the TAO FTS was granted the status of a Complementary Observation Station within the international community of high-resolution FTS users in the Network for the Detection of Atmospheric Composition and Change (NDACC).

Retrievals at TAO employ the optimal estimation method (OEM), and some impacts of the nec-essary a priori constraints are examined. Typical measurement parameters are presented together with retrieval parameters used to derive total and partial column concentrations of ozone. Instrument performance is discussed in terms of instrumental line shape (ILS) and phase error and modulation efficiency as a function of optical path difference. The FTS is dedicated to ground-based infrared solar absorption atmospheric measurements from Toronto, Ontario, Canada. The authors describe the optical design of a high-resolution Fourier Transform Spectrometer (FTS), which serves as the primary instrument at the University of Toronto Atmospheric Observatory (TAO).