FIGURE 2.10 Predicted atmospheric CO2 and climate-carbon cycle feedback parameters. (a) Atmospheric CO2 trajectories for simulations with the same prescribed fossil fuel emissions and no CO2-radiative feedbacks. (b) Difference in atmospheric CO2 due to radiative coupling. (c) Land biosphere response to increasing atmospheric CO2. (d) Land biosphere response to increasing temperature. (e) Ocean response to increasing atmospheric CO2. (f) Ocean response to increasing temperature. Gray lines show results from carbon-only model studies from Friedlingstein et al. (2006) (also reported in IPCC, 4th assessment). Thick black lines are from a nitrogen-carbon model (Thornton et al., 2009a); thick solid line for pre-industrial nitrogen deposition and thick dashed line for anthropogenic nitrogen deposition. Diamonds show the feedback parameters estimated at year 2100 for previous studies (Friedlingstein et al., 2006), and squares show their mean. Thin dotted lines indicate zero response. (adapted from Thornton et al., 2009a).