Time series of CO2 mole fractions, both
simulated and observed, at this CarbonTracker observation site. In
the top panel, measured mole fractions (open black
circles) are plotted along with CarbonTracker simulated values (light blue open circles). At
some sites, there are observations that CarbonTracker can not
simulate successfully; these are shown as filled red circles. The observations
corresponding to these rejected simulated values are shown with
open red circles. The bottom panel
shows a time series of residualsthe difference between the
simulated and measured mole fractionsshown with dark green open circles. These
residuals should be uncorrelated in time, unbiased (i.e., have a mean
of zero), and distributed normally. Also shown in the lower panel is
the imposed modeldata mismatch (orange lines), which in part defines
the rejection criterion (see documentation). Any
model first guess value which is more than three times the MDM away
from zero, after accounting for potential adjustments to the
simulated value due to optimizing fluxes, is rejected by the
optimization system. Rejected values, if there are any, are shown
with filled red circles.
