README FILE FOR FOSSIL FUEL CO2 EMISSIONS GENERATED FOR THE OCO-2 FLUX 
INVERSION INTERCOMPARISON


DATE

2016-10-12


SUMMARY

These fossil fuel CO2 (FFCO2) emission files are intended for use in 
the OCO-2 flux inversion intercomparison (currently being coordinated 
by David Baker). The FFCO2 data in these files come from a combination 
of two data products: 1) ODIAC and 2) TIMES.


TECHNICAL DESCRIPTION

ODIAC: The Open Data Inventory for Anthropogenic Carbon dioxide (ODIAC) 
version 2015a (ODIAC2015a: 2000-2014). ODIAC2015a spatially distributes 
national FFCO2 emissions at 1 deg x 1 deg according to a point source 
database and satellite observations of night time lights. The national 
emission estimates for the years 2000-2007 are taken from the national 
total emissions according to the Carbon Dioxide Information and Analysis
Center (CDIAC). For years 2008 to 2014, the CDIAC country totals are 
extrapolated by deriving country-specific growth rates from the global 
fuel statistics published annually by BP. Emissions of 2014 are repeated 
for 2015 and 2016. ODIAC uses monthly national FFCO2 data from CDIAC  
v2013 for representing seasonal variations of FFCO2. Full details on the 
methodology of ODIAC can be found in Oda and Maksyutov (2011) and Oda et
al. (in prep). ODIAC2015a and the most up-to-date data (ODIAC2016, 2000-
2016) are directly available at http://db.cger.nies.go.jp/dataset/ODIAC/

TIMES: Temporal Improvements for Modelling Emissions by Scaling (TIMES). 
TIMES 0.25 deg x 0.25 deg scale factors can be applied to gridded FFCO2 
emission maps like ODIAC to add representations of the diurnal and 
weekly variations in FFCO2 emissions. The methodology for deriving TIMES
from Vulcan + EDGAR is described in detail in Nassar et al (2013). TIMES
scale factors are modular and non-year-specific. The data are directly 
available at http://cdiac.ornl.gov/ftp/Nassar_Emissions_Scale_Factors/


FAIR USE POLICY

Please adhere to the fair use policies for each of the individual 
datasets available at the web links above. Note: If you intend to use 
the data for a purpose other than the OCO-2 flux intercomparison, it 
is especially important that you contact the data providers (listed 
below) and cite the appropriate publications.


REFERENCES

Nassar, R., L. Napier-Linton, K.R.R. Gurney, R. Andres, T. Oda, F.R. 
Vogel, and F. Deng, Improving the temporal and spatial distribution of 
CO2 emissions from global fossil fuel emission datasets, J. Geophys. 
Res., 118, 917-933, 2013, doi:10.1029/2012JD018196.

Oda, T. and S. Maksyutov, A very high resolution (1 km x 1 km) global 
fossil fuel CO2 emissions inventory derived using a point source 
database and satellite observations of nightlights, Atmos. Chem. Phys., 
11, 543-556, 2011, doi:10.5194/acp-11-543-2011.

Oda, T., Maksyutov, S. and Andres, R. J.: ODIAC 3.0: The Open-source 
Data Inventory for Anthropogenic CO2 (ODIAC) Fossil Fuel Emission Model 
Version 3.0, in preparation for Geoscientific Model Development.


CONTACTS

Sourish Basu
Cooperative Institute for Research in Environmental Science/NOAA Earth 
System Research Laboratory
sourish.basu@noaa.gov

Tom Oda
Universities Space Research Association/NASA Goddard Space Flight Center
tomohiro.oda@nasa.gov

Ray Nassar
Environment and Climate Change Canada
ray.nassar@canada.ca