Observation Instance

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{
    "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",
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        "dataPath": "/badc/ceh-pan/data",
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        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 1440363,
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    "dataLineage": "Data were collected by the instrument scientist before being processed and delivered for archiving at the Centre of Environmental Data Analysis (CEDA).",
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    "language": "English",
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