|Name||Global Monitoring Laboratory, NOAA|
|Address 3||325 Broadway Boulder, CO 80305-3328|
|Country/Territory||United States of America|
|Organization name||Global Monitoring Laboratory, NOAA|
|Organization country/territory||United States of America|
|Address 1||NOAA GML|
|Address 2||325 Broadway R/GML-1|
|Address 3||Boulder, CO 80305-3328|
|Country/territory||United States of America|
|Last updated date||2023-08-29|
9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO SF6 X2014
9999-12-31 00:00:00 - 9999-12-31 23:59:59: Unknown(Gas chromatography (ECD))
Value_unc is estimated uncertainty of the reported measurement value.
For measurements using gas chromatography, aliquots of gas from ambient air samples and a cylinder of reference gas are alternately injected into a gas chromatograph (GC) with a sampling valve. Sulfur hexafluoride (SF6) is separated from other sample components using packed columns and detected with an electron capture detector (ECD). The response of the ECD to SF6 is calibrated off-line about monthly relative to the reference with a suite of standards. Each aliquot of sample is measured relative to the same reference, and SF6 values are calculated from the response function. SF6 measurements are reported in units of picomol/mol (10^-12 mol SF6 per mol of dry air (pmol/mol) or parts per trillion (ppt)) relative to the NOAA 2014 SF6 standard scale. Reproducibility of our measurements (1 sigma) is approximately 0.01 nmol/mol, based on repeated analysis of air from a high-pressure cylinder, or the long-term variability in the differences between measurements of test flasks on the flask-air analysis system and separate measurements of the test gas used to fill the test flasks.
[Monthly] Monthly means are produced for each site by first averaging all valid measurement results in the event file with a unique sample date and time. Values are then extracted at weekly intervals from a smooth curve (Thoning et al., 1989) fitted to the averaged data and these weekly values are averaged for each month to give the monthly means recorded in the files. Flagged data are excluded from the curve fitting process. Some sites are excluded from the monthly mean directory because sparse data or a short record does not allow a reasonable curve fit. Also, if there are 3 or more consecutive months without data, monthly means are not calculated for these months.
|This is the NOAA 3-character quality control flag. Column 1 is the REJECTION flag. An alphanumeric other than a period (.) in the FIRST column indicates a sample with obvious problems during collection or analysis. This measurement should not be interpreted. Column 2 is the SELECTION flag. An alphanumeric other than a period (.) in the SECOND column indicates a sample that is likely valid but does not meet selection criteria determined by the goals of a particular investigation. For example, it might not have been obtained during 'background' conditions. Column 3 is the INFORMATION flag. An alphanumeric other than a period (.) in the THIRD column provides additional information about the collection or analysis of the sample. A P in the 3rd column of the QC flag indicates the measurement result is preliminary and has not yet been carefully examined by the PI. The P flag is removed once the quality of the measurement has been determined.|
Valid (background): ...
Valid (background): ..?
Atmospheric SF6 Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 1997-2022
These data are provided by NOAA. Principal investigators include Xin Lan (NOAA).
Please cite the product's citation when using data from this dataset : Lan, X., J.W. Mund, A.M. Crotwell, M.J. Crotwell, E. Moglia, M. Madronich, D. Neff and K.W. Thoning (2023), Atmospheric Sulfur Hexafluoride Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 1997-2022, Version: 2023-08-28, https://doi.org/10.15138/p646-pa37
Dew point temperature:
Sea water temperature:
Sea surface water temperature:
Sea water salinity:
Sea surface water salinity:
Meteorological data may remain as first provided, even when greenhouse gas data are updated.
|For more information, please refer: doi.org/10.15138/p646-pa37|
|Format||Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF|
|Relation List (Is Part Of)||
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2023-09-13
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2022-09-05
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2021-08-16
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2020-09-28
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2019-09-19
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2018-10-23
|1||Lan, X., J.W. Mund, A.M. Crotwell, M.J. Crotwell, E. Moglia, M. Madronich, D. Neff and K.W. Thoning (2023), Atmospheric Sulfur Hexafluoride Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 1997-2022, Version: 2023-08-28, https://doi.org/10.15138/p646-pa37|