{"ob_id":14136,"uuid":"5e650bc4a1b846d88b08b464d6df9b35","title":"Centre of Ecology and Hydrology (CEH): Long-term PAN measurements from eastern Scotland (1993-1999)","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. \r\n\r\nAnnual 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. \r\n\r\nThere 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.","keywords":"CEH, PAN, Chemistry","publicationState":"citable","dataPublishedTime":"2016-02-22T15:55:30","doiPublishedTime":"2016-03-07T10:48:45","updateFrequency":"notPlanned","status":"completed","result_field":{"ob_id":"https://catalogue.ceda.ac.uk/api/v2/observations/14308/?format=json","dataPath":"/badc/ceh-pan/data","oldDataPath":[],"storageLocation":"internal","storageStatus":"online","volume":1440363,"numberOfFiles":8,"fileFormat":"Data are BADC-CSV formatted"},"timePeriod":"https://catalogue.ceda.ac.uk/api/v2/times/3778/?format=json","geographicExtent":"https://catalogue.ceda.ac.uk/api/v2/bboxes/827/?format=json","nonGeographicFlag":false,"phenomena":["https://catalogue.ceda.ac.uk/api/v2/phenomona/22852/?format=json","https://catalogue.ceda.ac.uk/api/v2/phenomona/54637/?format=json","https://catalogue.ceda.ac.uk/api/v2/phenomona/54638/?format=json","https://catalogue.ceda.ac.uk/api/v2/phenomona/54639/?format=json"],"dataLineage":"Data were collected by the instrument scientist before being processed and delivered for archiving at the Centre of Environmental Data Analysis (CEDA).","removedDataTime":null,"removedDataReason":"","language":"English","identifier_set":["https://catalogue.ceda.ac.uk/api/v2/identifiers/8804/?format=json"],"projects":["https://catalogue.ceda.ac.uk/api/v2/projects/14133/?format=json"],"observationcollection_set":["https://catalogue.ceda.ac.uk/api/v2/observationcollections/14135/?format=json","https://catalogue.ceda.ac.uk/api/v2/observationcollections/25087/?format=json"],"responsiblepartyinfo_set":["https://catalogue.ceda.ac.uk/api/v2/rpis/55494/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/55496/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/55497/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/55498/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/55499/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/55501/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/54557/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/54559/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/55495/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/55500/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/54560/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/54558/?format=json"],"procedureAcquisition":"https://catalogue.ceda.ac.uk/api/v2/acquisitions/14186/?format=json","procedureCompositeProcess":null,"procedureComputation":null,"permissions":[{"ob_id":"https://catalogue.ceda.ac.uk/api/v2/observations/2526/?format=json","useLimitation":null,"accessConstraints":null,"accessCategory":"public","accessRoles":null,"label":"public: None group","licenceURL":"http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/","licenceClassifications":"any, attribution required"}],"discoveryKeywords":[{"ob_id":1138,"name":"NDGO0003"}]}