Improved Fossil CO2 emissions for the
North American Carbon Program (NACP) :
the “Vulcan” project
Kevin Gurney
Daniel Mendoza, Broc Seib, Chris Miller
Purdue University
Department of Earth and Atmospheric Science
Purdue Climate Change Research Center
Rosen Center for Advanced Computing
Steve Knox, Scott Denning, Kathy Corbin, Dennis Ojima
Colorado State University
Marc Fischer, Scott Murtishaw
Lawrence Berkeley National Laboratory
Supported by NASA grant NNG05GG12G
www.purdue.edu/eas/carbon/vulcan.html
Old vs “Vulcan”
natlog of tonnes C/day: January 3, 2002
Country-level consumption
Distrib. By 
“point” sources
Tonnes C/day/facility
“on-road” sources
Dynamic emissions
Rush hours:
• 8 am, 6 pm peaks
• Dominant in
exurban/rural
Both Sides Now…….