x_tags

• Source: http://cdiac.ornl.gov:8080/xml/cdp/metadata/Trends/Other_atm_gas/Oram.xml
• simpleSaveXMLlength: 4205
• OME_version: Version 4.7.2e, Revision Date: 19 Jul 2005
• DTD_version: metadata10.dtd
• Creation_datetime: 20050719 100812
• Creation_IP: 160.91.18.40
• File_revision: 20050803 125351
• Product_number: TRENDS-OTHER ATMOSPHERIC TRACE GASES
• Product_title: Atmospheric Fluoroform (CHF3, HFC-23) at Cape Grim, Tasmania

Author
• Name: Oram, D. E.
• Company: University of East Anglia
• Organization: School of Environmental Sciences

Author
• Name: Sturges, W. T.
• Company: University of East Anglia
• Organization: School of Environmental Sciences

Author
• Name: Penkett, S. A.
• Company: University of East Anglia
• Organization: School of Environmental Sciences

Author
• Name: McCulloch, A.
• Company: ICI Chemicals and Polymer Ltd.
• Organization: Safety and Environment Department

Author
• Name: Fraser, P. J.
• Company: Commonwealth Scientific and Industrial Research Organization
• Organization: CR for Southern Hemisphere Meteorology, Division of Atmoshperic Research
• Thematic_area: Atmospheric Trace Gases
• Begin_date: 19780426
• End_date: 19951123
• North: -41
• South: -41
• East: 145
• West: 145

Site_info
• Site_name: Cape Grim, Tasmania, Australia
• Site_URL: http://cdiac.ornl.gov/trends/otheratg/oram/oram.html
• Site_data_file: http://cdiac.ornl.gov/ftp/trends/otheratg/oram/oramdata.txt
• Site_data_file: http://cdiac.ornl.gov/trends/otheratg/oram/oram.gif
• Data_site:
• Variable: fluoroform
• Variable: CHF3
• Variable: HFC-23

Descriptive_file
http://cdiac.ornl.gov/trends/otheratg/oram/oram.html
• Data_file:
• Data_IO_file:
• Initial_date_of_data_publication: 20001214
• Most_recent_date_of_data_publication: 20001214
• Keyword: fluoroform
• Keyword: CHF3
• Keyword: HFC-23
• Data_file_location: http://cdiac.ornl.gov/ftp/trends/otheratg/oram/
• Total_size_of_all_files: 3k
• Distribution: external
• CDIAC_contact: Thomas A. Boden; email: bodenta@ornl.gov
• Notes: The sampling and analytical methods are described more fully in Oram et al. (1998). In summary, air samples were taken from the archive of Cape Grim, Tasmania (41 degrees S, 145 degrees E) air samples collected from 1978 through 1995. Comparisons of CFC-11, CFC-12, CFC-113, CH3CCl3, and CH4 data between archive samples and corresponding in-situ samples for the same dates confirm that the archive samples are both representative and stable over time. Samples were analyzed by gas chromatography-mass spectrometry (GC-MS), using a KCl-passivated alumina PLOT column. Fluoroform was monitored on mass 69 (CF3^+). The analytical precision (one standard deviation of the mean) for two or three replicate analyses was typically +/- 1% of the mean measured value. The overall uncertainty of the observed data is +/- 10%, taking into account uncertainties in the preparation of the primary standards, the purity of the fluoroform used to make the primary standards, as well as the analytical precision. <br><br> The measured concentration of fluoroform at Cape Grim has increased from about 2 pptv in early 1978 to about 11 pptv by late 1995. The current growth rate is 0.55 pptv per year over the period 1990-1995, or about 5% per year relative to the late 1995 value.