| Summary: | A C-130 aircraft, owned by the National Science Foundation and operated by the National Center for Atmospheric Research,rests on the tarmac at sunrise at the Churchill, Manitoba, Canada airport during the Tropospheric Ozone Production about the Spring Equinox (TOPSE) experiment (February 2000). Winds ranged up to 30 miles per hour (48 kilometers per hour), with air temperatures as low as -22 degrees Fahrenheit (-30 degrees Celsius). The goal of TOPSE was to investigate the chemical and dynamic evolution of tropospheric chemical composition over mid- to high-latitude continental North America during the winter/spring transition, with particular emphasis on the springtime ozone maximum in the troposphere.
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