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3.5 Year Monitoring of 225 GHz Opacity at the Summit of Greenland
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2016
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Source: Publications of the Astronomical Society of the Pacific, 129(972), 025001
[PDF-1.65 MB]
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Journal Title:Publications of the Astronomical Society of the Pacific
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Description:We present the 3.5 years monitoring results of 225 GHz opacity at the summit of the Greenland ice sheet (Greenland Summit Camp) at an altitude of 3200 m using a tipping radiometer. We chose this site as our submillimeter telescope (Greenland Telescope) site, because conditions are expected to have low submillimeter opacity and because its location offers favorable baselines to existing submillimeter telescopes for global-scale Very Long Baseline Interferometry. The site shows a clear seasonal variation with the average opacity lower by a factor of two during winter. The 25%, 50%, and 75% quartiles of the 225 GHz opacity during the winter months of November through April are 0.046, 0.060, and 0.080, respectively. For the winter quartiles of 25% and 50%, the Greenland site is about 10%–30% worse than the Atacama Large Millimeter/submillimeter Array (ALMA) or the South Pole sites.
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Source:Publications of the Astronomical Society of the Pacific, 129(972), 025001
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ISSN:0004-6280;1538-3873;
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