Title: Spatial representativeness evaluation of air quality monitoring sites by point-centred variography
Authors: KRACHT OLIVERGERBOLES MICHEL
Citation: INTERNATIONAL JOURNAL OF ENVIRONMENT AND POLLUTION vol. 65 no. 1/2/3 p. 229-245
Publisher: INDERSCIENCE ENTERPRISES LTD
Publication Year: 2019
JRC N°: JRC110756
ISSN: 0957-4352 (online)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC110756
DOI: 10.1504/IJEP.2019.101843
Type: Articles in periodicals and books
Abstract: We propose a geostatistical technique based on point-centred semi-variograms that can be used to derive valuable information about the spatial representativeness of air quality monitoring sites. Whereas classical geostatistics describes the spatial correlation structure of a concentration field in terms of the variogram, point-centred variography is based on the average of squared concentration differences observed in pairs formed from a particular central point and the set of all other points in the domain. It thereby places a monitoring station in the context of the local or regional air quality pattern. We demonstrate how a mathematical inversion of the point-centred variogram can provide estimates of the extent of the representativeness area of a monitoring site. The application of this approach is tested on a set of modelling data from the city of Antwerp, which was used for the FAIRMODE/AQUILA intercomparison exercise of methods for the assessment of spatial representativeness.
JRC Directorate:Energy, Transport and Climate

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