Gridded Emissions Data Update
Users of previously released gridded data (versions v2016-06-18 and v2016-07-26) should update to the May 2017 versions to avoid the following issues.
Data users have reported two issues with the gridded emissions data. These are: 1) year-to-year inconsistencies in the country/sector level gridded data and 2) a small error in the intended seasonal distribution of emissions. Neither of these issues change total emissions by country and sector.
Issue 1) above regarding gridded emissions distributions causes non-trivial, and sometimes sudden shifts, in the emission distribution within countries. These shifts are most noticeable for large countries such as the USA and China. Users have reports that these can have significant impacts on results in some models (such as the magnitude of aerosol indirect effects) .
The May 2017 gridded data release to ESGF corrects both of these issues.
Documentation of these issues, including time series and spatial graphs are available at https://goo.gl/tGrc27.
Emissions data from the CEDS Project for use in CMIP6 historical and preindustrial control runs is being distributed through the Earth System Grid Federation (ESGF). Please see the README file available below before using this data.
- We will also release soon (June 2017) a “rough cut” extension of CH4 emissions between1850 and 1970 (in decadal increments) for models that require CH4 emissions over all years.
- May 2017: *** IMPORTANT *** revised gridded data (ver. 2017-05-18) were published that corrected some errors in the previous gridded data (ver. 2016-06-18, and 2016-07-26, see README and analysis of difference between the new and old data sets at: https://goo.gl/tGrc27). The new release also included CO2 emissions (all years) and CH4 emissions (from 1970 forward).
- September 2016: files were re-published in a new format (with sectors contained within a dimension) due to a limitation in ESGF software on some nodes. (version numbers were amended with -sectordim)
- June and July 2016: preindustrial (1750-1850) data (ver. 2016-06-18) and historical 1851-2014 (ver. v2016-07-26) for aerosol and reactive gas species were published on ESGF.
The CEDS anthropogenic emissions data is published within the ESGF system under the following metadata:
:activity_id = “input4MIPs”;
:dataset_category = “emissions”;
:realm = “atmos”;
:institute = “PNNL-JGCRI”
:product = “primary-emissions-data”
You can also search for a specific emission species under the “variable” category in your ESGF search.
Supplemental data with speciated VOC emissions and emissions from solid biofuel combustion are also provided through ESGF, see the README files linked below for further information. (metadata tagged as :product = “supplementary-emissions-data”).
Please note, the variables called xx-em-solid-biofuel are not open biomass emissions. These are a sub-set of anthropogenic emissions as described in the README.
See: https://www.earthsystemcog.org/projects/cog/ for a list of ESGF nodes. The input4MIPs project can be found by using “Search with options”. You can also go directly to: https://esgf-node.llnl.gov/search/input4mips.
Auxiliary Emissions Information
- A README (August 2017)README (August 2017) text file with data description and other details
- A single Checksum file that provides machine readable totals by species, sector, month, and year for 1750-through-2014
- netCDF file with assumed grid cell areas
- Comparison graphs show the new time series as compared to the RCP historical data used in CMIP5 (see README file for a discussion) for Pre-industrial (1750-1850) and for 1850-2014
- VOC README file for speciated VOC emission