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Centre of Ecology and Hydrology (CEH): Long-term PAN measurements from eastern Scotland (1993-1999)

Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Citable
Publication Date: 2016-02-22
DOI Publication Date: 2016-03-07
Download Stats: last 12 months


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.

Annual 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.

There 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.

Citable as:  Cape, J.N.; McFadyen, G.G. (2016): Centre of Ecology and Hydrology (CEH): Long-term PAN measurements from eastern Scotland (1993-1999). Centre for Environmental Data Analysis, 07 March 2016. doi:10.5285/4480C33F-DB02-44C4-AEF7-A71D99DDC6AC.
Abbreviation: Not defined
Keywords: CEH, PAN, Chemistry


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were collected by the instrument scientist before being processed and delivered for archiving at the Centre of Environmental Data Analysis (CEDA).

Data Quality:
For information about known issues or measurement accuracy with these data please refer to
File Format:
Data are BADC-CSV formatted

Process overview

This dataset was generated by instruments deployed on platforms as listed below.

Instrument/Platform pairings

CEH PAN Gas Chromatograph Deployed on: CEH Bush Estate

Independent Instruments

CEH PAN Gas Chromatograph
Output Description None
  • long_name: PAN mixing ratio
  • names: PAN mixing ratio
  • long_name: Peroxyacetyl Nitrate (PAN)
  • names: Peroxyacetyl Nitrate (PAN)
  • long_name: data flag
  • names: data flag
  • long_name: date_time
  • names: date_time

Co-ordinate Variables

Temporal Range
Start time:
End time:
Geographic Extent