1-hourly medians of 1-min Aethalometer data measured at 880 nm. The hourly medians are derived from the 1-min observations; missing data arise from rejection of medians where fewer than 50% of the 1-min average data were present. Observations were made at Halley research station, in coastal Antarctica, as part of the British Antarctic Survey programme of tropospheric chemistry. Observations were made throughout 2015 at the Halley Clean Air Sector Laboratory.
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