Figure 4From: Carbon fluxes in ecosystems of Yellowstone National Park predicted from remote sensing data and simulation modelingCASA model annual (a) NPP and (b) NEP (2006) for the Yellowstone study area. All estimates are in units of g C m2 yr-1, with negative NEP values (red) representing net source fluxes of CO2 to the atmosphere and positive NEP values (blue) representing net sink fluxes of CO2 from the atmosphere to the ecosystem.Back to article page