The ORNL DAAC is pleased to announce the release of a data set from the North American Carbon Program (NACP) Mid-Continent Intensive (MCI) campaign:
NACP MCI: Tower Atmospheric CO2 Concentrations, Upper Midwest Region, USA, 2007-2009 . Data set prepared by N.L. Miles, S.J. Richardson, K.J. Davis, A.E. Andrews, T.J. Griffis, V. Bandaru, and K.P. Hosman.
This data set provides high precision and high accuracy atmospheric CO2 data from seven well instrumented towers located in the U.S. Upper Midwest. The overall sampling period was from January 2007 through December 2009. The sampling network included: the five "Ring 2" towers [Centerville (Iowa), Galesville (Wisconsin), Kewanee (Illinois), Mead (Nebraska), and Round Lake (Minnesota)] deployed and operated by PSU; the Missouri Ozarks (Missouri) co-located AmeriFlux site [PSU/Oak Ridge National Laboratory (ORNL)]; and the Rosemount (Minnesota) tower trace gas observatory [University of Minnesota, Rosemount Research and Outreach Center (RROC)].
Hourly CO2 dry mole fractions (in ppm) were averaged from measurements made at different above-ground levels on the towers. For the five Ring 2 sites, daily daytime average CO2 dry mole fractions were also calculated, from hourly values between 12:00-17:00 local time.
The North American Carbon Program (NACP) is a multi-disciplinary research program designed to obtain scientific understanding of North America's carbon sources and sinks and of the changes in carbon stocks needed to meet societal concerns, and to provide tools for decision makers. NACP began in 2002 and continues to date. The NACP data collection contains continental carbon budgets, dynamics, processes, and management of the sources and sinks of carbon dioxide, methane, and carbon monoxide in North America and in adjacent ocean regions.
The ORNL DAAC is a NASA-funded data center archiving and distributing terrestrial ecology and biogeochemical dynamics data.