Monthly Atmospheric CO2 Mixing Ratios from the NOAA CMDL Carbon Cycle Cooperative Global Air Sampling Network, 1968-2002

Tans, P. P.; Conway, T.J.

doi:10.15485/1464220

Title: Monthly Atmospheric CO2 Mixing Ratios from the NOAA CMDL Carbon Cycle Cooperative Global Air Sampling Network, 1968-2002

Dataset
Other Related Research

Abstract

Starting in 1968, air samples were collected in cylindrical glass flasks tapered at both ends to ground glass stopcocks lubricated with hydrocarbon grease. At several sites from 1980 to 1985 samples were also collected in spherical 5-L flasks equipped with a single ground glass stopcock. These flasks were filled by the evacuation method described below. In 1983, measurements of CH4 in the flask samples were begun. Experiments at this time revealed that CO mixing ratios increased with time in the greased flasks. In 1989, 0.5-L glass flasks equipped with glass piston Teflon O-ring stopcocks were introduced into the network so CO could be measured in addition to CO2 and CH4. In 1990, measurements of 13C/12C and 18O/16O of CO2 in the flask samples were begun. The precision of the isotopic measurements was better with larger volume flasks, so in 1991 2.5-L glass flasks with two Teflon O-ring stopcocks began to replace the 0.5-L flasks. In 1994, the conversion of the network to 2.5-L flasks was completed. Samples continue to be collected in 2.5-L flasks.

Authors:

Tans, P. P.; Conway, T.J.

National Oceanic and Atmospheric Administration, Climate Monitoring and Diagnostics Laboratory

Publication Date:: 2005-04-01

Other Number(s):: cdiac:NOAA/CMDL

Research Org.:: Environmental System Science Data Infrastructure for a Virtual Ecosystem (ESS-DIVE) (United States)

Subject:: 54 ENVIRONMENTAL SCIENCES

Keywords:: Atmospheric; CO2; Carbon; Carbon Dioxide; NOAA; CMDL; mixing ratio; Climate Monitoring; Year; January; February; March; April; May; June; July; August; September; October; November; December

OSTI Identifier:: 1464220

DOI:: https://doi.org/10.15485/1464220

Citation Formats


                    Tans, P. P., and Conway, T.J. Monthly Atmospheric CO2 Mixing Ratios from the NOAA CMDL Carbon Cycle Cooperative Global Air Sampling Network, 1968-2002.  United States: N. p., 2005. 
        Web.  doi:10.15485/1464220.

Copy to clipboard


                    Tans, P. P., & Conway, T.J. Monthly Atmospheric CO2 Mixing Ratios from the NOAA CMDL Carbon Cycle Cooperative Global Air Sampling Network, 1968-2002.  United States.  doi:https://doi.org/10.15485/1464220

Copy to clipboard


                    Tans, P. P., and Conway, T.J. 2005.  
"Monthly Atmospheric CO2 Mixing Ratios from the NOAA CMDL Carbon Cycle Cooperative Global Air Sampling Network, 1968-2002".  United States.  doi:https://doi.org/10.15485/1464220.  https://www.osti.gov/servlets/purl/1464220. Pub date:Fri Apr 01 00:00:00 EST 2005

Copy to clipboard


                    
@article{osti_1464220,

  title        = {Monthly Atmospheric CO2 Mixing Ratios from the NOAA CMDL Carbon Cycle Cooperative Global Air Sampling Network, 1968-2002},

  author       = {Tans, P. P. and Conway, T.J.},

  abstractNote = {Starting in 1968, air samples were collected in cylindrical glass flasks tapered at both ends to ground glass stopcocks lubricated with hydrocarbon grease. At several sites from 1980 to 1985 samples were also collected in spherical 5-L flasks equipped with a single ground glass stopcock. These flasks were filled by the evacuation method described below. In 1983, measurements of CH4 in the flask samples were begun. Experiments at this time revealed that CO mixing ratios increased with time in the greased flasks. In 1989, 0.5-L glass flasks equipped with glass piston Teflon O-ring stopcocks were introduced into the network so CO could be measured in addition to CO2 and CH4. In 1990, measurements of 13C/12C and 18O/16O of CO2 in the flask samples were begun. The precision of the isotopic measurements was better with larger volume flasks, so in 1991 2.5-L glass flasks with two Teflon O-ring stopcocks began to replace the 0.5-L flasks. In 1994, the conversion of the network to 2.5-L flasks was completed. Samples continue to be collected in 2.5-L flasks.},

  doi          = {10.15485/1464220},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {2005},

  month        = {4}

}

Copy to clipboard

Dataset:

View Dataset

DOI: https://doi.org/10.15485/1464220

Save / Share:

Export Metadata

Save to My Library

Similar records in DOE Data Explorer and OSTI.GOV collections:

Atmospheric Carbon Dioxide Mixing Ratios from the NOAA CMDL Carbon Cycle Cooperative Global Air Sampling Network (2009)

Dataset Conway, T.J. ; Tans, P. P.

The National Oceanic and Atmospheric Administration's Climate Monitoring and Diagnostics Laboratory (NOAA/CMDL) has measured CO2 in air samples collected weekly at a global network of sites since the late 1960s. Atmospheric CO2 mixing ratios reported in these files were measured by a nondispersive infrared absorption technique in air samples collected in glass flasks. All CMDL flask samples are measured relative to standards traceable to the World Meteorological Organization (WMO) CO2 mole fraction scale. These measurements constitute the most geographically extensive, carefully calibrated, internally consistent atmospheric CO2 data set available and are essential for studies aimed at better understanding the globalmore »« less
Atmospheric Methane Mixing Ratios--The NOAA/CMDL Global Cooperative Air Sampling Network, 1983-1993

Dataset Dlugokencky, E. J. ; Lang, P. M. ; Masarie, K. A. ; ...

This data base presents atmospheric methane (CH4) mixing ratios from flask air samples collected over the period 1983-1993 by the National Oceanic and Atmospheric Administration, Climate Monitoring and Diagnostics Laboratory's (NOAA/CMDL's) global cooperative air sampling network. Air samples were collected approximately once per week at 44 fixed sites (37 of which were still active at the end of 1993). Samples were also collected at 5 degree latitude intervals along shipboard cruise tracks in the Pacific Ocean between North America and New Zealand (or Australia) and at 3 degree latitude intervals along cruise tracks in the South China Sea between Singaporemore »« less
Atmospheric Carbon Monoxide Mixing Ratios NOAA Climate Monitoring and Diagnostics Laboratory Cooperative Air Sampling Network (1988-1993) (DB1011)

Dataset Novelli, P. C. ; Masarie, K. A.

Individual site files provide CO mixing ratios in parts per billion (ppb) (ppb = parts in 109 by mole fraction) based on measurements from the NOAA/CMDL Cooperative Air Sampling Network beginning 1988. Data are provided through June 1993 for stations at which the first sample was collected before July 1991. All samples were analyzed for CO at the NOAA/CMDL laboratory in Boulder by gas chromatography with mercuric oxide reduction detection, and all measurements are referenced to the CMDL CO scale (Novelli et al., 1991, Novelli et al., 1994).For access to the data files, click this link to the CDIAC datamore »« less
Atmospheric methane data for 1989-1992 from the NOAA/CMDL global cooperative air sampling network. Technical memo

Technical Report Lang, P M ; Dlugokencky, E J ; Masarie, K A ; ...

Measurements are presented of atmospheric methane from the National Oceanic and Atmospheric Administration, Climate Monitoring and Diagnostics Laboratory (NOAA/CMDL) cooperative air sampling network. The format is similar to that of three earlier memoranda that detail the sampling history, methodologies, procedures, instruments, and calibration history of the NOAA/CMDL methane measurement program. In this report the authors cover the period 1989-1992. The air sampling procedures and equipment, changes to the air sampling network, and analysis system are discussed. Monthly mean mixing ratios, determined from curves fitted to the measurement data, are tabulated for each site. The measurements are plotted versus time formore » each site.« less
Atmospheric CH4 seasonal cycles and latitude gradient from the NOAA CMDL cooperative air sampling network. Technical memo

Technical Report McIntosh, C M ; Dlugokencky, E J ; Lang, P M ; ...

Methane has been measured in air samples collected as part of the NOAA CMDL Carbon Cycle Group Cooperative Air Sampling Network since 1983. The data from each site are used to determine two important parameters that are useful in constraining the global CH4 budget: seasonal cycles and the latitude gradient. Seasonal cycles and the latitude gradient are tabulated and shown graphically. Interannual variations in both parameters are quantified as standard deviations.

Similar Records