####### README ####### The Open-source Data Inventory for Anthropogenic CO2 (ODIAC), version 2022 (ODIAC2022) !!! PLEASE READ OUR DATA POLICY (https://db.cger.nies.go.jp/dataset/ODIAC/data_policy.html) !!! 1) ODIAC2022 The Open-source Data Inventory for Anthropogenic CO2 (ODIAC) is a global high-resolution fossil fuel CO2 emission (ffco2) data product (Oda and Maksyutov, 2011; Oda et al., 2018). The year 2022 version of ODIAC (ODIAC2022, 2000-2021) is based on the latest country ffco2 estimates (2000-2019) made by the Carbon Dioxide Information Analysis Center (CDIAC) team at the Appalachian State University (CDIAC at AppState, Gilfillan et al. 2021, Hefner et al. 2022). The emission spatial disaggregation was done using multiple spatial proxy data, such as geographical location of point sources, satellite observations of nightlights, and aircraft and ship fleet tracks. The emissions seasonality was taken from the CDIAC monthly gridded data product (Andres et al. 2011) and the Carbon Monitor product (2020-2021, https://carbonmonitor.org/). The year 2019 CDIAC country-level estimates were projected for the recent years (2020 and 2021) using fuel consumption data reported by the latest BP statistical review of the world (BP, 2022). The ODIAC approach, methodology, and etc. are described in Oda et al. (2018) ESSD. 2) Data format and unit The ODIAC emission data product is provided in two spatial resolutions: 1x1 km and 1x1 degree. The 1x1 km ODIAC emission data files are provided in GeoTIFF format (https://trac.osgeo.org/geotiff/). Values are provided in the unit of tonne carbon/cell (monthly total). Note the 1x1 km ODIAC emission files only include emissions over land regions. Emissions from international aviation and marine bunker are NOT included. The 1x1 degree ODIAC emission data files are provided in netCDF format (https://www.unidata.ucar.edu/software/netcdf/). Values are provided in the unit of gram carbon/m2/day (monthly mean). 3) Global scaling factor We applied a global scaling factor to match the sum of country total emissions to the CDIAC global total emissions. Below is the list of the global scaling factors used in the production of ODIAC2022. See more in the section 3.1 and the table A2 in Oda et al. (2018) ESSD. Global total Year ffco2 in PgC Scaling factor ---- ------------ -------------- 2000 6.808 1.0072 2001 6.859 1.0086 2002 7.029 1.0100 2003 7.420 1.0141 2004 7.683 1.0121 2005 7.992 1.0184 2006 8.253 1.0169 2007 8.464 1.0140 2008 8.661 1.0115 2009 8.538 1.0122 2010 9.004 1.0141 2011 9.291 1.0106 2012 9.484 1.0176 2013 9.569 1.0241 2014 9.628 1.0229 2015 9.639 1.0218 2016 9.721 1.0294 2017 9.851 1.0245 2018 10.111 1.0292 2019 10.175 1.0280 2020 9.7 -- 2021 10.2 -- ---- ------------ -------------- 3) References Andres, R.J., Gregg, J.S., Losey, L., Marland, G. and Boden, T. 2011. Monthly, global emissions of carbon dioxide from fossil fuel consumption, Tellus, 63 (3), 309-327, https://doi.org/10.1111/j.1600-0889.2011.00530.x BP. 2022. Statistical Review of World Energy - all data, 1965-2019 (year 2022 edition), https://www.bp.com/en/global/corporate/energy-economics/statistical-review-of-world-energy.html (last assess date: 04/18/23) Gilfillan, D. and Marland, G. 2021. CDIAC-FF: global and national CO2 emissions from fossil fuel combustion and cement manufacture: 1751-2017, Earth Syst. Sci. Data, 13, 1667-1680, https://doi.org/10.5194/essd-13-1667-2021, 2021 Hefner, M., Marland, G., Boden, T. and Andres, R. 2022. Global, Regional, and National Fossil-Fuel CO2 Emissions: 1751-2019 CDIAC-FF, Research Institute for Environment, Energy, and Economics, Appalachian State University. https://energy.appstate.edu/cdiac-appstate/data-products Oda, T. and Maksyutov, S. 2011. A very high-resolution (1 km x 1 km) global fossil fuel CO2 emission inventory derived using a point source database and satellite observations of nighttime lights, Atmos. Chem. Phys., 11, 543-556, https://doi.org/10.5194/acp-11-543-2011. Oda, T., Maksyutov, S., and Andres, R. J. 2018. The Open-source Data Inventory for Anthropogenic CO2, version 2016 (ODIAC2016): a global monthly fossil fuel CO2 gridded emissions data product for tracer transport simulations and surface flux inversions, Earth Syst. Sci. Data, 10, 87-107, https://doi.org/10.5194/essd-10-87-2018. 4) Contact The ODIAC team (help at odiac.org) Dr. Shamil Maksyutov (NIES contact point) The Satellite Observation Center, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan. Dr. Tomohiro Oda (Project lead) The Earth from Space Institute, Universities Space Research Association, Washington D.C, USA. NOTE: Data users are encouraged to report possible errors in the data product. However, we will NOT respond to requests solely for technical assistance on the data use. 5) Acknowledgement The production of ODIAC2022 was supported by the NIES GOSAT-2 project. UPDATED ON APR18, 2023