Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 2 1 2009 10.5194/amtd-2-343-2009 http://www.atmos-meas-tech-discuss.net/2/343/2009/ http://www.atmos-meas-tech-discuss.net/2/343/2009/amtd-2-343-2009.html http://www.atmos-meas-tech-discuss.net/2/343/2009/amtd-2-343-2009.pdf 343 377 2009-02-16 Springtime Arctic ground-based spectroscopy of O₃ and related trace gases at Eureka, Canada – Part 1: Evaluation of the analysis method and comparison with infrared measurements E. Farahani elham@atmosp.physics.utoronto.ca K. Strong R. L. Mittermeier H. Fast M. Van Roozendael C. Fayt Department of Physics, University of Toronto, Toronto, Ontario, Canada Environment Canada, Toronto, Ontario, Canada Belgian Institute for Space Aeronomy (IASB-BIRA), Belgium now at: SPARC International Project Office, University of Toronto, Toronto, Ontario, Canada For the first time in spring 1999 the ground-based UV-visible zenith-sky measurements of stratospheric gases were performed at Environment Canada's Arctic Stratospheric Ozone Observatory (ASTRO) located at Eureka, Nunavut, Canada (80.05° N, 86.42° W, 610 m a.s.l.). The University of Toronto UV-visible ground-based spectrometer (UT-GBS) has been deployed for nine years afterwards at Eureka to measure ozone and NO₂ total columns by using sunlight scattered from the zenith sky during spring, when the conditions leading to polar ozone depletion develop. During spring 2000, elevated OClO slant column densities were also measured for the first time. 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