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Carbon dioxide mapping data (JMA Ocean CO2 Map)

Updated on 21 Dec. 2018
Global Environment and Marine Department

Gridded data for global carbon dioxide partial pressure (pCO2), sea-air CO2 flux, pH, dissolved inorganic carbon(DIC) and total alkalinity(TA) are available for download.

Sample map

flux_sample flux_cbar pH_sample pH_cbar


Data description

The JMA Ocean CO2 Map dataset consists of information on monthly oceanic pCO2 and CO2 uptake over a grid of 1° latitude × 1° longitude squares. The pCO2 field is calculated using analytical sea surface temperatures, salinity and chlorophyll-a concentration data from satellite observation, and that of CO2 uptake is calculated based on the difference between oceanic and atmospheric pCO2 and data on 10 m wind speeds. Details of the method are provided in Iida et al. (2015).

Format

Data are in NetCDF format (ZIPped) with the dimensions and variables shown below.

dimensions:
        lon = 360 ;
        lat = 180 ;
        time = 12 ;
variables:
        float lon(lon) ;
                lon:units = "degrees_east(0.5_359.5)" ;
                lon:long_name = "longitude" ;
                lon:missing_value = -999.f ;
                lon:point_spacing = "even" ;
        float lat(lat) ;
                lat:units = "degrees_north(-89.5_89.5)" ;
                lat:long_name = "latitude" ;
                lat:missing_value = -999.f ;
                lat:point_spacing = "even" ;
        int time(time) ;
                time:units = "months since 2016-01-15" ;
        float pCO2s(time, lat, lon) ;
                pCO2s:unit = "uatm" ;
                pCO2s:long_name = "sea surface pCO2" ;
                pCO2s:missing_value = -999.f ;
        float flux(time, lat, lon) ;
                flux:unit = "mol/m2/yr" ;
                flux:long_name = "sea-air CO2 flux positive: source for atmosphere" ;
                flux:missing_value = -999.f ;
        float dic(time, lat, lon) ;
                dic:unit = "umol/kg" ;
                dic:long_name = "DIC" ;
                dic:missing_value = -999.f ;
        float ndic(time, lat, lon) ;
                ndic:unit = "umol/kg" ;
                ndic:long_name = "Salinity normalized DIC" ;
                ndic:missing_value = -999.f ;
        float ta(time, lat, lon) ;
                ta:unit = "umol/kg" ;
                ta:long_name = "Total Alkalinity" ;
                ta:missing_value = -999.f ;
        float nta(time, lat, lon) ;
                nta:unit = "umol/kg" ;
                nta:long_name = "Salinity normalize TA" ;
                nta:missing_value = -999.f ;
        float pH(time, lat, lon) ;
                pH:unit = "pH" ;
                pH:long_name = "pH(insitu)" ;
                pH:missing_value = -999.f ;

Sample program

JMA_co2map_sample.ZIP - a sample R source file program enabling data reading (137°E, 30°N) for specific years and months (ZIPped).

Data file download

Monthly oceanic CO2 data are archived every year. All files are around 7 MB.
Each year's flux data are recalculated at every update. So we recommend using the latest data set.

yearDATA yearDATA yearDATA
1990JMA_co2map_1990.ZIP 2000JMA_co2map_2000.ZIP 2010JMA_co2map_2010.ZIP
1991JMA_co2map_1991.ZIP 2001JMA_co2map_2001.ZIP 2011JMA_co2map_2011.ZIP
1992JMA_co2map_1992.ZIP 2002JMA_co2map_2002.ZIP 2012JMA_co2map_2012.ZIP
1993JMA_co2map_1993.ZIP 2003JMA_co2map_2003.ZIP 2013JMA_co2map_2013.ZIP
1994JMA_co2map_1994.ZIP 2004JMA_co2map_2004.ZIP 2014JMA_co2map_2014.ZIP
1995JMA_co2map_1995.ZIP 2005JMA_co2map_2005.ZIP 2015JMA_co2map_2015.ZIP
1996JMA_co2map_1996.ZIP 2006JMA_co2map_2006.ZIP 2016JMA_co2map_2016.ZIP
1997JMA_co2map_1997.ZIP 2007JMA_co2map_2007.ZIP 2017JMA_co2map_2017.ZIP
1998JMA_co2map_1998.ZIP 2008JMA_co2map_2008.ZIP 2018-
1999JMA_co2map_1999.ZIP 2009JMA_co2map_2009.ZIP 2019-

Commentary

Reference

Documents discribing the datasets are in preparation. The following citations should be included to cite the datasets: