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Long-term PAN measurements from eastern Scotland (1993-1999)

Cape, John Neil; McFadyen, G G. Long-term PAN measurements from eastern Scotland (1993-1999). CEDA 7 March 2016, http://dx.doi.org/10.5285/4480C33F-DB02-44C4-AEF7-A71D99DDC6AC [Output (Electronic)]

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Abstract/Summary

Abstract Hourly measurement data for PAN (peroxyacetyl nitrate) mixing ratios in the atmosphere at a rural site at Bush Estate, Penicuik EH26 0QB (CEH Edinburgh), 15 km south of Edinburgh, from 1993 to 1999 in ppt (parts in 10^12). Measurements were made using a gas chromatograph with electron capture detector. Annual average concentrations were between 0.1 and 0.15 nl l-1, with episodes up to 3 nl l-1 in long-range transported polluted air. PAN concentrations were approximately log-normally distributed. The concentrations measured are the result of a balance between photochemical production rates and removal by thermal decomposition and dry deposition. There was a pronounced seasonal maximum in PAN concentrations in late spring, and a strong diurnal cycle only in April-June, with a maximum at 1700 h. Individual episodes, with concentrations up to 3 nl l-1, could be traced over distances of ca. 1000 km, with rapid changes in concentration as the prevailing winds advected polluted air masses across the site.

Item Type: Output (Electronic)
Electronic Identifier / URL / DOI: http://dx.doi.org/10.5285/4480C33F-DB02-44C4-AEF7-A71D99DDC6AC
Date made live: 11 Mar 2016 17:08 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/513202

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