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NO 2
Acronym NOAA
Name Global Monitoring Laboratory, NOAA
Address 1 NOAA/ESRL
Address 2 R/GML1
Address 3 325 Broadway Boulder, CO 80305-3328
Country/Territory United States of America
Website https://gml.noaa.gov/


Name Isaac Vimont
Prefix Dr.
Email isaac.vimont@noaa.gov
Organization No 2
Organization acronym NOAA
Organization name Global Monitoring Laboratory, NOAA
Organization country/territory United States of America
Address 1
Address 2
Address 3
Country/territory United States of America
Tel (303) 497-6044
Last updated date 2022-06-08

Name Stephen A. Montzka
Prefix Dr.
Email Stephen.A.Montzka@noaa.gov
Organization No 2
Organization acronym NOAA
Organization name Global Monitoring Laboratory, NOAA
Organization country/territory United States of America
Address 1
Address 2
Address 3
Country/territory United States of America
Tel (303) 497-6657
Fax (303) 497-6290
Last updated date 2022-06-08

 Background observation
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: NOAA-2018-PR1
 9999-12-31 00:00:00 - 2015-07-29 23:59:59: M2(Gas chromatography (MS))
 2014-10-03 00:00:00 - 9999-12-31 23:59:59: PERSEUS-1(Gas chromatography (MS))
 Instrument 'PR1' mole fraction data supplied by I.J. Vimont (isaac.vimont@noaa.gov, 303.497.6044)
from instrument PERSEUS-1 GC/MS analysis of stainless steel and/or glass flask pairs
collected at the HATS remote sites.
All mole fraction (*_C) and pair standard deviation (*_sd, 95% confidence interval) data
reported as dry gas mole fractions in the following units and scale:
Units: parts-per-trillion (ppt)
Scale: NOAA-2018-PR1

M2 data notes:
25--Feb-19 "NOAA/ESRL/GMD flask data, supplied by S. Montzka (instrument = M2 results; stephen.a.montzka@noaa.gov) and Ben Miller (instrument = PR1 results; ben.r.miller@noaa.gov) for collaborative use (see the read.me file for more information)"
M2 data have been scaled by a single factor, 1.0397, to make them consistent with PR1 data.
 All mole fraction data have been filtered to require:
a) two aliquots per flask with differences <= 0.2 ppt (95% confidence interval), and
b) flask pair differences <= 0.2 ppt (95% confidence interval).
All known analytical and/or sampling problem data have been omitted. Data which appear anomalously high or low,
but for which we do not know of any analytical or sampling issues, have been given a '>' or '<' flag symbol, respectively,
in an effort to produce our best guess as to the background values, which are denoted with flag '-'.
 Valid (background): -
 Valid: >
 Valid: <
 Wind direction: 1
 Wind speed: 1
 Relative humidity: 0
 Precipitation amount: 0
 Air pressure: 0
 Air temperature: 0
 Dew point temperature: 0
 Sea water temperature: 0
 Sea surface water temperature: 0
 Sea water salinity: 0
 Sea surface water salinity: 0
Meteorological data may remain as first provided, even when greenhouse gas data are updated.
No DOI available

 Related information

Format Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF
Relation List (Is Part Of) All HFC-125 data contributed to WDCGG by GAW stations and mobiles by 2021-06-29
Geolocation Point
Latitude (north: +; south: -) 71.3230133057
Longitude (east: +; west: -) -156.6114654541

 GAW Data Policy

"For Scientific purposes, access to these data is unlimited and provided without charge. By their use you accept that an offer of co-authorship will be made through personal contact with the data providers or owners whenever substantial use is made of their data. In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."

 Citation format

This format is an example of the WDCGG standard citation.
Please follow the citation format which the data providers or owners indicate.
Isaac Vimont (NOAA), Stephen A. Montzka (NOAA), Atmospheric HFC-125 at Barrow (AK) by Global Monitoring Laboratory, NOAA , dataset published as HFC-125_BRW_ surface-flask_NOAA_hats-gcms at WDCGG, ver. 2022-06-23-1140 (Reference date*: YYYY/MM/DD)

* As the reference date, please indicate the date you downloaded the files.


1  S. A. Montzka, J. H. Butler, R. C. Myers, T. M. Thompson, T. H. Swanson, A. D. Clarke, L. T. Lock, and J. W. Elkins, Decline in the tropospheric abundance of halogen from halocarbons: Implications for stratospheric ozone depletion, Science, 272, 1318-1322, 1996.
2  S. A. Montzka, J. H. Butler, J. W. Elkins, T. M. Thompson, A. D. Clarke, and L. T. Lock, Present and Future Trends in the Atmospheric Burden of Ozone-Depleting Halogens, Nature, 398, 690-694, 1999.
3  Montzka, S.A., B.D. Hall, J.W. Elkins, Accelerated increases observed for hydrochlorofluorocarbons since 2004 in the global atmosphere, Geophys. Res. Lett., 36, L03804, doi:10.1029/2008GL036475, 2009.
4  Montzka, S.A., R.C. Myers, J.H. Butler, and J.W. Elkins, Early trends in the global tropospheric abundance of hydrochlorofluorocarbon-141b and -142b, Geophys. Res. Lett., 21, 2483-2486, 1994.
5  Montzka, S.A., R.C. Myers, J.H. Butler, J.W. Elkins, and S.O. Cummings, Global tropospheric distribution and calibration scale of HCFC-22, Geophys Res. Lett., 20, 703-706, 1993.
6  Montzka, S.A., R.C. Myers, J.H. Butler, J.W. Elkins, L. Lock, A. Clarke, and A.H. Goldstein, Observations of HFC-134a in the remote troposphere, Geophys Res. Lett., 23, 169-172, 1996.
7  Montzka, S.A., M. McFarland, S.O. Andersen, B.R. Miller, D.W. Fahey, B.D. Hall, L. Hu, C. Siso, J.W. Elkins, Recent trends in global emissions of hydrochlorofluorocarbons and hydrofluorocarbons: Reflecting on the 2007 Adjustments to the Montreal Protocol, J. Phys. Chem. A, 119, 4439-4449, doi:10.1021/jp5097376, 2015.