Radiocarbon content of soil carbon and respired CO2 near T-Van from 2012 to 2015, Seasonal

To test the hypothesis that old carbon may be contributing to the
carbon source strength of alpine tundra near T-Van, a chamber (growing
season) and two types of subsurface gas wells (remainder of the year)
were used to collect respired carbon dioxide samples for radiocarbon
analysis from four locations across a soil moisture gradient near
T-Van between 2012 and 2015. Near surface soil samples (~10 cm depth)
from each site were additionally collected and density fractionated in
order to model the contribution of various carbon pools to respired
carbon fluxes on a seasonal basis through time. All samples were
purified and graphitized by the INSTAAR Laboratory for AMS Radiocarbon
Preparation and Research at the University of Colorado Boulder, then
shipped to the Keck Carbon Cycle AMS Lab at the University of
California, Irvine for analysis.