The GlobalView Carbon Dioxide (CO2) data product contains synchronized and smoothed time series of atmospheric CO2 concentrations at selected sites that were created using the data extension and integration techniques described by Masarie and Tans, (1995). The information needed to derive this time series is also in this data set, along with extensive documentation. The longest period of coverage is from 1979 to 2001 with some sites having longer or shorter temporal coverage.
These techniques were developed using CO2 measurements from the NOAA CMDL cooperative air sampling network and have been successfully applied to other trace gas measurement records. Carbon dioxide data from other laboratories have been extended and integrated with the NOAA CMDL measurements into GlobalView CO2 with careful attention to both methodology and standard scales.
Note that the GlobalView CO2 data products are derived from measurements but contain no actual data. To facilitate heterogenous CO2 data use in carbon cycle modeling studies, the measurements have been processed (smoothed, interpolated, and extrapolated) resulting in extended records that are evenly incremented in time. Note that GLOBALVIEW- CO2 data and documents are updated once every two years and the most up-to-date references are available at http://www.cmdl.noaa.gov/ccgg/globalview/.
There are 92 files with this data set which includes 89 *.zip data files. The other three files include 2 files with site information, one comma-delimited ASCII file (.csv), and one .dat file, and one .dat file which is a single reference marine boundary layer matrix file which contains CO2 mixing ratios as a function of time and sine of latitude and is a by-product of the data extension procedure.
Additional information and GLOBALVIEW product updates maybe found at: http://www.esrl.noaa.gov/gmd/ccgg/globalview/.
This data set is one of the products of the International Satellite Land-Surface Climatology Project, Initiative II (ISLSCP II) data collection which contains 50 global time series data sets for the ten-year period 1986 to 1995. A complete description of the data, it's derivation, project and workshop descriptions, acknowledgements, and references provided by the ISLSCP II Data Management Staff are included with this data set in the following companion files: 1_globalview_co2_doc.pdf and 2_gv_co2_2003_doc.pdf.
ISLSCP II is a consistent collection of data sets that were compiled from existing data sources and algorithms, and were designed to satisfy the needs of modelers and investigators of the global carbon, water, and energy cycle. The data were acquired from a number of US and international agencies, universities, and institutions. The data and documentation have undergone two peer reviews.
ISLSCP is one of several projects of the Global Energy and Water Cycle Experiment (GEWEX) [http://www.gewex.org/] and has the lead role in addressing land-atmosphere interactions -- process modeling, data retrieval algorithms, field experiment design and execution, and the development of global data sets.
Related Data Sets:
Cite this data set as follows:
Masarie, K.A. 2012. ISLSCP II GlobalView: Atmospheric CO2 Concentrations. In Hall, Forrest G., G. Collatz, B. Meeson, S. Los, E. Brown de Colstoun, and D. Landis (eds.). ISLSCP Initiative II Collection. Data set. Available on-line [http://daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. http://dx.doi.org/10.3334/ORNLDAAC/1111
The archived data sets for ISLSCP II have been organized by categories. This data set is in the Carbon category.
Data Set Spatial Extent: point measurements throughout the world
Westernmost Longitude: -180 W
Easternmost Longitude: 180 E
Northernmost Latitude: 90N
Southernmost Latitude: -90 S
Data Set Temporal Extent: 1979 through 2001
Data File Format
There are 92 data files with this data set, which includes 89 compressed *.zip files and 3 additional files described below:
0_gv_table_co2.csv: contains a table with site information for all sites used in this data set and measurement labs.
0_globalview_co2_sites.dat: contains the full names of the sites with the abbreviations, latitude, longitude, and temporal coverage for all sites used in this data set.
0_ref_mbl_mtx_co2.dat: a single reference marine boundary layer matrix file which contains CO2 mixing ratios as a function of time and sine of latitude and is a by-product of the data extension procedure (see Masarie and Tans, 1995).
The 89 .zip files are named after the sampling site and the country or location of the site.
hat-japan_co2.zip: Site location is Hateruma Island, Japan
pfa-alaska_co2.zip: Site location is Poker Flats, Alaska, U.S.A.
When extrapolated the 89 .zip files contain the following number of dat files:
|File name||# of dat files|
The .dat file names use
the following format:
site/prog_data group_lab#_sampling strategy_sampling platform_qualifier_ch4.dat
site/prog: 3-character alphanumeric field specifying site or program code.
data group: grouping of data within the file.
lab# (contributing laboratory): Two-character numeric field
identifies the measurement laboratory (00-99).
Sampling strategy: Single alphanumeric character (0-9,a-z,A-Z) indicates the sampling strategy.
Sampling platform: Single alphanumeric character (0-9,a-z,A-Z) indicates the sampling platform.
Qualifier: Multiple alphanumeric character field (0-9,a-z,A-Z) identifies the file’s contents. Files with the “ext”, “wts”, “var”, and “seas” qualifier exist for all sites. Files with the “diu” qualifier accompany a subset of extended records derived from high-resolution measurement records where the diurnal cycle is a dominant feature of the observations. Files with the “tod” qualifier accompany a subset of extended records derived from discrete measurements where sample collection times have been made available.
Example data file names:
cgo_02D0_ext_co2.dat: extended CO2 record derived from CSIRO discrete measurements at Cape Grim.
lef011_00C3_diu_c02.dat: average diurnal cycle of CO2 derived from CMDL continuous measurements from a tower in Wisconsin. Sampling height is 11 m.
orl035_11D2_seas_co2.dat: average seasonal cycle of CO2 derived from the LSCE discrete measurements from aircraft. Altitude bin is centered at 3.5 km.
orl035_11D2_var_co2.dat: average atmospheric variability of CO2 derived from the LSCE discrete measurements from aircraft. Altitude bin is centered at 3.5 km. Location is France.
Refer to 0_globalview_co2_sites.dat for site names and site information.
Masarie, K.A. and P.P Tans, "Extension and Integration of Atmospheric Carbon Dioxide Data into a Globally Consistent Measurement Record. Journal of Geophysical Research, Vol. 100, No. D6, p. 11593-11610. June 1995.
This data is available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).
Contact for Data Center Access Information:
Telephone: +1 (865) 241-3952