Changing supersites: assessing the impact of the southern UK EMEP supersite relocation on measured atmospheric composition

Walker, H.L.; Heal, M.R.; Braban, C.F. ORCID: https://orcid.org/0000-0003-4275-0152; Ritchie, S.; Conolly, C.; Sanocka, A.; Dragosits, U. ORCID: https://orcid.org/0000-0002-9283-6467; Twigg, M.M. ORCID: https://orcid.org/0000-0002-5462-3348. 2019 Changing supersites: assessing the impact of the southern UK EMEP supersite relocation on measured atmospheric composition. Environmental Research Communications, 1 (4), 041001. 12, pp. 10.1088/2515-7620/ab1a6f

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Abstract/Summary

In January 2016 the United Kingdom's southern European Monitoring and Evaluation Programme (EMEP) level-2 air pollution monitoring 'supersite' was relocated from Harwell, Oxfordshire to Chilbolton Observatory, Hampshire. As no co-location study was undertaken, this work retrospectively investigates whether the supersite relocation has led to discontinuities in the time series of concentrations of commonly studied gaseous pollutants (NOx, NH3, SO2 and O3) and particulate matter (PM2.5 and PM10). Two years of measurements pre- and post-relocation (2014–15 and 2016–17 respectively) were analysed in conjunction with meteorological variables and local emission data. The deweather package was applied to the concatenated time series to minimise the influence of meteorology. Similar average concentrations of PM2.5, PM10, SO2 and O3 were observed, but there were substantial differences in that of NOx and NH3 (increase by factors of ~1.6 and ~3, respectively). The considerably higher NH3 concentrations at Chilbolton are attributed to the close proximity of mixed farmland, in particular to a strong south-westerly source contributing to ~50% of the annual average. NOx and PM concentrations in easterly winds arriving at Chilbolton are ~2.7 and ~1.5 times larger than at Harwell, from sources including the M3 motorway and Greater London. Westerly concentrations of NOx remain similar, therefore despite a higher frequency of westerly wind, annual mean concentrations are larger. Lower concentrations of PM arriving from the west result in similar annual averages. The secondary inorganic and black carbon components of PM were broadly similar between the sites. The differences in average NOx and NH3 at Chilbolton must be taken into account when considering long-term regional trends based on the southern UK supersite data.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1088/2515-7620/ab1a6f
UKCEH and CEH Sections/Science Areas:	Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN:	2515-7620
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	air pollution, monitoring networks, EMEP supersites, ammonia
NORA Subject Terms:	Atmospheric Sciences
Date made live:	13 May 2019 15:48 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/523294

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