Category Archives: ACE Arctic Validation Campaigns

Is there an Arctic ozone hole?

By Kristof Bognar PhD Candidate, U. of Toronto When scientists speak of the ‘ozone hole’, they usually mean the large region of low stratospheric ozone concentration that develops above Antarctica each Southern Hemisphere spring (August–October). These occur because conditions over … Continue reading

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Eureka’s dramatically changing sunlight

By Dan Weaver Ph.D. Candidate, University of Toronto You have likely noticed the days are getting longer.­1 It’s a welcome relief from the short dark days of winter. Toronto, for example, will enjoy over 12 hours of sunlight on April … Continue reading

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Why do scientists travel to Eureka during polar sunrise?

By Debora Griffin PhD candidate, Department of Physics, University of Toronto Every year at the end of February a group of scientists travels to Eureka, Nunavut, 80°N. On February 21st, when the Canadian Arctic ACE/OSIRIS validation campaign typically starts, the … Continue reading

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Preparations for the 2014 ACE campaign at PEARL

By Dan Weaver Ph.D. Candidate, University of Toronto The 2014 ACE satellite validation team is nearly ready for this year’s research trip to PEARL. We will be travelling to Yellowknife on February 24, then onwards to Eureka, Nunavut on February … Continue reading

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Watching for Arctic ozone holes

This year’s ACE Arctic Validation Campaign is moving smoothly towards its end. I’ve started to compare measurements taken from this year to 2012. We have all taken more spectra this year due to the great weather. We’ve enjoyed clear skies and sun for almost … Continue reading

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Temperature inversion in the Arctic

Under normal conditions, the temperature in the lowest layer of the atmosphere (the troposphere) decreases with height. The higher you go, the colder the temperature becomes. This is why there can be snow-capped mountains in warm climates. However, something quite … Continue reading

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The start of the 2013 ACE Validation Campaign

Every year, a team of scientists travels up to Eureka, Nunavut for a few weeks of intensive atmospheric measurements at the Polar Environment Atmospheric Research Lab (PEARL). This campaign started a few days ago (on February 25th), and runs until … Continue reading

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