14C of soil CO2 from International Polar Year (IPY) International Tundra Experiment (ITEX) Cross Site Comparison

Study sites: Toolik Lake Field Station Alaska, USA 68.63 N, 149.57 W; Atqasuk, Alaska USA 70.45 N, 157.40 W; Barrow, Alaska, USA 71.30 N, 156.67 W; Latnjajaure, Sweden 68.35 N, 18.50 E; Falls Creek, Australia: Site 2-unburned 36.90 S 147.29 E; Site 3-burned 36.89 S 147.28 E. Additional sites will be added summer 2008, but the exact sites are not finalized. Purpose: Collect soil carbon dioxide (CO2) for analysis of radiocarbon to evaluate the age of the carbon respired in controls and warmed plots from across the International Tundra Experiment (ITEX) network. Treatments: control and ITEX Open Top Chamber (OTC) warming experiment (1994-2007). Design: 5 replicates of each treatment at dry site and moist site. Sampling frequency: Once per peak season.