7f08ed13-d2dd-4b0b-adc0-1615be14b88a eng Ev-K2-CNR +39 035 3230511 +39 035 3230551 Via San Bernardino 145 Bergamo BG 24126 Italy metadata@evk2cnr.org http://www.evk2cnr.org/ 2012-03-10T19:00:14 ISO 19115:2003/19139 1.0 The determination of a regional atmospheric background mixing ratio for anthropogenic greenhouse gases: a comparison of two independent methods 2008-03-01T00:00:00 Atmospheric Environment, 45, 2011 39 7396-7405 Atmospheric Environment (December 2011), 45 (39), pg. 7396-7405 1352-2310 Halocarbons are powerful greenhouse gases capable of significantly influencing the radiative forcing of the Earth’s atmosphere. Halocarbons are monitored in several stations which are globally distributed in order to assess long term atmospheric trends and to identify source regions. However, to achieve these aims the definition of background mixing ratios, i.e. the mixing ratio in a given air mass when the recent contribution of local sources is absent, is necessary. This task can be accomplished using different methods. This paper presents a statistical methodology that has been devised specifically for a mountain site located in Continental Europe (Monte Cimone, Italy), characterised by the vicinity of strong sources. The method involves the decomposition of the observed data distribution into a Gaussian distribution, representative of background values, and a Gamma distribution, ascribable to contribution from stronger sources. The method has been applied to a time series from a European marine remote station (Mace Head, Ireland) as well as to time series from Monte Cimone. A comparison of the methodology described in this paper with a well-established meteorological filtering procedure at Mace Head has shown an excellent agreement. A comparison of the baselines at Mace Head, Mt. Cimone and the Swiss alpine station of the Jungfraujoch highlighted the occurrence of a specific background concentration. Although this paper presents the application of the method to three hydrofluorocarbons, the proposed methodology can be extended to any long lived atmospheric component for which a long term time series is available and at any location even if affected by strong source regions. Michela Maione The University of Urbino "Carlo Bo" - Chemical Science Institute +39 0722303316 +39 0722303310 Piazza Rinascimento, 6 Urbino PU 61029 Italy michela.maione@uniurb.it www.uniurb.it Francesco Furlani The University of Urbino "Carlo Bo"-Department of Basic Sciences and Fundamentals (DiSBeF) +39 0722304249 Piazza della Repubblica, 13 Urbino PU 61029 Italy francesco.furlani@uniurb.it http://www.disbef.uniurb.it Umberto Giostra The University of Urbino "Carlo Bo" -Science campus Sogesta +39 0722304249 Via Ca Le Suore 2/4 Urbino PU 61029 Italy u.giostra@uniurb.it http://scitec.uniurb.it Stefan Reimann Swiss Federal Laboratories for Materials Science and Research (EMPA) +41 0587654638 +41 0587661122 Überlandstrasse 129 Düebendrof ZH CH-8600 Switzerland stefan.reimann@empa.ch www.empa.ch Elsevier Science Publishing Company nlinfo@sciencedirect.com http://www.elsevier.com/wps/find/homepage.cws_home Jgor Arduini The University of Urbino "Carlo Bo" - Chemical Science Institute +39 0722303316 +39 0722303311 Piazza Rinascimento 6 Urbino PU 61029 Italy j.arduini@uniurb.it www.unirb.it Simon O'Doherty School of Chemistry, University of Bristol, +44 1179289186 +44 1179252990 Bristol BS8 1TS United Kingdom S.ODoherty@bristol.ac.uk http://www.chm.bris.ac.uk Alistair Manning Met Office,Exeter FitzRoy Road Exeter EX1 3PB United Kingdom alistair.manning@metoffice.gov.uk http://www.metoffice.gov.uk/research/people/alistair-manning Daniela Cava Institute of Atmospheric Sciences and Climate (ISAC) - CNR +39 0832298721 Str. Prov. Lecce - Monteroni Km 1 Lecce LE 73100 Italy d.cava@isac.cnr.it http://hermes.le.isac.cnr.it/cava/ WWW:LINK-1.0-http--related https://geoportal.mountaingenius.org/geonetwork/srv/eng/resources.get?uuid=7f08ed13-d2dd-4b0b-adc0-1615be14b88a&fname=mountain_witness__s.png thumbnail png SHARE Time series Anthropogenic factor Application method Organic compounds Background concentration Gaussian distribution Mountain Air mass Trend analysis Long term Surveillance Halogen Organic compounds Greenhouse gas Ireland Europe Italy eng climatologyMeteorologyAtmosphere environment -11.5 43.2 35.3 81.4 http://www.sciencedirect.com/science/article/pii/S135223101100700X WWW:LINK-1.0-http--related Abstract:"The determination of a regional atmospheric background mixing ratio for anthropogenic greenhouse gases: a comparison of two independent methods" https://geoportal.mountaingenius.org/webapp/srv/en/resources.get?id=37843&fname=&access=private WWW:DOWNLOAD-1.0-http--download “The determination of a “regional” atmospheric background mixing ratio for anthropogenic greenhouse gases: A comparison of two independent methods”. Atmospheric Environment (December 2011), 45 (39), pg. 7396-7405 U. Giostra; F. Furlani; J. Arduini; D. Cava; A.J. Manning; S.J. O’Doherty; S. Reimann; M. Maione