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NO 2
Acronym NOAA
Name Earth System Research Laboratory, NOAA
Address 1 R/GMD1
Address 2 NOAA/ESRL
Address 3 325 Broadway Boulder, CO 80305-3337
Country/Territory United States of America
Website https://www.esrl.noaa.gov/gmd/index.html


Name Ed Dlugokencky
Email ed.dlugokencky@noaa.gov
Organization No 2
Organization acronym NOAA
Organization name Earth System Research Laboratory, NOAA
Organization country/territory United States of America
Address 2 325 Broadway R/GML-1
Address 3 Boulder, CO 80305-3328
Country/territory United States of America
Tel 303-497-6228
Last updated date 2020-08-26

 Background observation
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO CH4 X2004A
 1989-02-02 12:34:56 - 1992-08-13 16:20:00: Unknown(Gas chromatography (FID))
 Uncertainties are reported for each measurement based on analytical repeatability, reproducibility, and our ability to propagate the WMO CH4 mole
fraction standard scale.
Analytical repeatability is based on one of the methods above or on the average absolute value of pair agreement between pairs collected nearly simultaneously.
It varies with analytical instrument from 0.2 to 2.3 ppb. Propagation of the scale is based on the reproducibility determined for scale propagation in our calibration laboratory.
It has a fixed value of 0.5 ppb based on subsequent calibrations of the same cylinder at least one year after the first. Reproducibility is based on long-term variations in measurements of target cylinders, typically ~0.3 ppb.
The three terms are added in quadrature (square root of the sum of the squares) to estimate the measurement uncertainty at 68% confidence interval.
 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): ..?
 Valid: .??
 Invalid: ???
 Atmospheric Methane Dry Air Mole Fractions from the NOAA ESRL GMD Carbon Cycle Cooperative Global Air Sampling Network, 1968-2019
These data are provided by NOAA. Principal investigators include Ed Dlugokencky (NOAA).
 Wind direction:
 Wind speed:
 Relative humidity:
 Precipitation amount:
 Air pressure:
 Air temperature:
 Dew point temperature:
 Sea water temperature:
 Sea surface water temperature:
 Sea water salinity:
 Sea surface water salinity:
Meteorological data may remain as first provded, even when greenhouse gas data are updated.
1  Dlugokencky, E.J., A.M. Crotwell, J.W. Mund, M.J. Crotwell, and K.W. Thoning (2020), Atmospheric Methane Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 1983-2019, Version: 2020-07, https://doi.org/10.15138/VNCZ-M766
2  Dlugokencky, E. J., L. P. Steele, P. M. Lang and K. A. Masarie, (1994), The growth rate and distribution of atmospheric methane, Journal of Geophysical Research, 99, D8, 17, doi:10.1029/94JD01245.