In order to use GLOBALVIEW-CO2C13 as it was intended, users should read and understand the documentation provided here. It is also highly recommended that users consult the relevant published literature; a partial list is provided in References.

GLOBALVIEW-CO2C13 is derived from measurements but contains no actual data. 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.

Smoothed, interpolated, and extrapolated values in the extended records are determined with varying degrees of confidence. We strongly encourage users to consider the relative weights assigned to these values when using this product.

GLOBALVIEW-CO2C13 is subject to change as members of the Cooperative Atmospheric Data Integration Project reserve the right to adjust individual measurement records based on recalibrations of standard gases and instruments.

The GLOBALVIEW-CO2C13 data product continues to evolve. Extended records and statistical summaries may change as techniques are refined and new data are added.