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Global mapping data on CO2 concentrations

   Gridded data for global carbon dioxide (CO2) can be downloaded in NetCDF format from this page. These data are derived by the Japan Meteorological Agency (JMA) with an inversion method from observation data reported to the WMO World Data Centre for Greenhouse Gases (WDCGG) operated by JMA. 

Data details

   The JMA has performed atmospheric inversion analysis to provide global CO2 distribution maps covering the period from 1985 to 2016 (Maki et al., 2010; Nakamura et al., 2015). The CO2 mapping datasets consist of information representing monthly mean CO2 concentrations as dry-air mole fractions over 2.5° latitude × 2.5° longitude grid squares. Two datasets with different vertical levels are provided: one is a constant-altitude version with 9 vertical levels from the surface to a pressure altitude of 8 km with 1 km intervals, and the other is a model-level version with 60 vertical levels in sigma-pressure hybrid coordinates. 

Data file download

   Monthly mean CO2 data are recorded in yearly files. The file sizes are approximately 3.2 MB for the constant-altitude version and 20 MB for the model-level version. All files are updated yearly based on recalculation using new observation data. Users should be sure to reference to the latest files. 

Select dataset:  

Data format

   Data are in NetCDF format (zip-compressed) with the dimensions and variables shown below. 

Sample scripts

   Sample scripts for the constant-altitude dataset based on the Grid Analysis and Display System (GrADS) are shown below. GrADS is freely distributed by the Center for Ocean-Land-Atmosphere Studies (COLA). 

Supporting information


 The following citation should be included wherever these data are used:

Nakamura, T., T. Maki, T. Machida, H. Matsueda, Y. Sawa and Y. Niwa (2015):Improvement of Atmospheric CO2 Inversion Analysis at JMA, A31B-0033 (https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/64173), AGU Fall Meeting, San Francisco, 14-18 Dec. 2015.

 Further information

Maki, T., M. Ikegami, T. Fujita, T. Hirahara, K. Yamada, K. Mori, A. Takeuchi, Y. Tsutsumi, K. Suda and T. J. Conway (2010):New technique to analyse global distributions of CO2 concentration and fluxes from non-processed observational data, Tellus, doi: 10.1111/j.1600-0889.2010.00488.x.

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