####### README ####### The Open-source Data Inventory for Anthropogenic CO2 (ODIAC), version 2023 (ODIAC2023) !!! PLEASE READ OUR DATA POLICY (https://db.cger.nies.go.jp/dataset/ODIAC/data_policy.html) !!! 1) ODIAC2023 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 2023 version of ODIAC (ODIAC2023, 2000-2022) is based on the latest country ffco2 estimates (2000-2020) made by the Carbon Dioxide Information Analysis Center (CDIAC) team at the Appalachian State University (CDIAC at AppState, Gilfillan et al. 2021, Hefner and Marland, 2023). 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 supplemented using the Carbon Monitor product (2020-2022, https://carbonmonitor.org/). The year 2020 CDIAC country-level estimates were projected for the recent years (2021 and 2022) using fuel consumption data reported by the latest 2023 statistical review of world energy published by the Energy Institute(https://www.energyinst.org/statistical-review). 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 ODIAC2023. 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 ---- ------------ -------------- 2001 6.859 1.0099 2002 7.029 1.0112 2003 7.423 1.0159 2004 7.699 1.0145 2005 8.004 1.0204 2006 8.247 1.0163 2007 8.478 1.0160 2008 8.676 1.0141 2009 8.542 1.0129 2010 9.008 1.0147 2011 9.292 1.0109 2012 9.483 1.0179 2013 9.569 1.0246 2014 9.629 1.0238 2015 9.646 1.0226 2016 9.723 1.0287 2017 9.853 1.0240 2018 10.105 1.0279 2019 10.183 1.0264 2020 9.730 1.0364 2021 10.277 -- 2022 10.354 -- ---- ------------ -------------- 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 Energy Institute, 2023. Statistical Review of World Energy - all data, 1965-2019 (year 2022 edition), https://www.energyinst.org/statistical-review (last assess date: 05/20/24) 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. and Marland, G. 2023. Global, Regional, and National Fossil-Fuel CO2 Emissions: 1751-2020 CDIAC-FF, Research Institute for Environment, Energy, and Economics, Appalachian State University. https://energy.appstate.edu/research/work-areas/cdiac-appstate 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 TO is supported by NASA’s Carbon Monitoring System (CMS) program. UPDATED ON JUN 5, 2024