GLOBALVIEW-CO2 is a product of the Cooperative Atmospheric Data Integration Project. While the project is coordinated and maintained by the Carbon Cycle Greenhouse Gases Group of the National Oceanic and Atmospheric Administration, Earth System Research Laboratory (NOAA ESRL), it is a cooperative effort among the many organizations and institutions making high-quality atmospheric CO2 measurements.
GLOBALVIEW-CO2 is an attempt to address issues of temporal discontinuity and data sparseness in atmospheric observations and is a tool intended for use in carbon cycle modeling. The impetus for the work done by the many cooperating organizations and institutions is to make high-precision atmospheric measurements of trace gas species that will facilitate a better understanding of the processes controlling their abundance. These and other measurements have been widely used to constrain atmospheric models that derive plausible source/sink scenarios. Serious obstacles to this approach are the paucity of sampling sites and the lack of temporal continuity among observations from different locations. Consequently, there is the potential for models to misinterpret these spatial and temporal gaps resulting in derived source/sink scenarios that are unduly influenced by the sampling distribution.
GLOBALVIEW-CO2 is derived from atmospheric measurements but contains no actual data. Observations used to derive the data product have been selected for baseline conditions. Baseline selection is site-specific. In most instances, selection is done by the PIs before submission to GLOBALVIEW and based on their knowledge of local conditions. Users are encouraged to review the literature for further details on baseline selection strategies. To facilitate use with carbon cycle modeling studies, the measurements have been processed (smoothed, interpolated, and extrapolated) resulting in extended records that are evenly incremented in time. Be aware that information contained in the actual data may be lost in this process. Users are encouraged to review the actual data in the literature, in data archives (CDIAC, WDCGG), or by contacting the participating laboratories.
GLOBALVIEW-CO2 is derived using the data extension and data integration techniques described by Masarie and Tans, . These techniques were developed using CO2 measurements from the NOAA ESRL cooperative air sampling network. Carbon dioxide measurement records from other laboratories have been extended and integrated with the NOAA ESRL measurements into GLOBALVIEW-CO2 with careful attention to both methodology and standard scales.