Gridded Products : pH (globap)


Maps of pH (Global)

Data Download


The product was created using the improved technique of Yasunaka et al. (2013, JGR).
The data is provided as .csv files.
Please note that the related data are not included in the files.

Temporal Coverage
Monthly from January 2001 to December 2014.
Spatial Coverage
1 degree × 1 degree grid in the global ocean (60°S-70°N, 0°E-00°W)


We thank many observed data providers to Surface Ocean CO2 Atlas (


Nakaoka, S., M.Telszewski, Y.Nojiri, S.Yasunaka, C.Miyazaki, H.Mukai and N.Usui.: Estimating temporal and spatial variation of ocean surface pCO2 in the North Pacific using a Self Organizing Map neural network technique, Biogeosciences, 10, 6093-6106, doi:10.5194/bg-10-6093-2013, 2013.

Yasunaka, S., Y.Nojiri, S.Nakaoka, T.Ono, H.Mukai and N.Usui (2013), Monthly maps of sea dissolved inorganic carbon in the North Pacific: Basinwide distribution and seasonal variation, J. Geophys. Res. Oceans, 118, 3843-3850, doi:10.1002/jgrc.20279.

Center for Global Environment Research,
National Institute for Environmental Studies.
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