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BioCORN Study 2011 – Eddy covariance fluxes over energy crop ecosystems Martin Graus (1, 2), Carsten Warneke (1, 2), Eric J Williams (1, 2), Brian M Lerner (1, 2), Jessica B Gilman (1, 2), Rui Li (1, 2), Allyson SD Eller (1, 3), Christopher Gray (1, 3), Noah Fierer (1, 3), Ray Fall (1, 4), Peter C Harley (5), James M Roberts (2), Christopher Fryrear (6), Mark Collins (6), Karl Whitman (6), Joost De Gouw (1, 2) (1) CIRES, University of Colorado, Boulder, CO, United States. (2) CSD, NOAA, Boulder, CO, United States. (3) Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, United States. (4) Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, United States. (5) ACD, NCAR, Boulder, CO, United States. (6) ARDEC, Colorado State University, Fort Collins, CO, United States. In summer 2011 an eddy covariance system was set up in a corn field at ARDEC (CSU, Ft Collins, CO) to investigate the energy flux and the trace gas exchange of the US' dominant biofuel crop. Besides energy flux, evapotranspiration and CO2 flux a comprehensive suite of volatile organic compounds and inorganic species (O3, NO, NO2, CO) were measured for virtual disjunct eddy covariance (vDEC) analysis and true eddy covariance (EC) fluxes, respectively. VOCs were monitored by PTR-MS and, for the first time, fluxes of formic acid were measured utilizing NI-CIMS data for vDEC analysis. Besides the EC approach leaf level flux measurements and soil flux measurements were performed using a GC-MS system (TACOH) coupled to a modified Li6400 system and to soil chambers, respectively. Ethanol and methanol are amongst the compounds with the largest emissions from corn leaves. DMS is amongst the species found to be emitted by the soil and to a significantly larger extent from the corn leaves with a strong diurnal pattern indicating stomatal control over the DMS flux. This comprehensive dataset of trace gas fluxes over one of the most abundant plant species in the USA will help us better understand the potential influence of agricultural crops on regional air chemistry. |
