Crevoisier, C., M. Gloor, E. Gloaguen, L. W. Horowitz, J. L. Sarmiento, C. Sweeney
and P. P. Tans
, (2006), A direct carbon budgeting approach to infer carbon sources and sinks. Design and synthetic application to complement the NACP observation
, Tellus Series B: Chemical and Physical Meteorology
, 58, 5, 366-375, 10.1111/j.1600-0889.2006.00214.x
In order to exploit the upcoming regular measurements of vertical carbon dioxide (CO2) profiles over North America implemented in the
framework of the North American Carbon Program (NACP), we design a
direct carbon budgeting approach to infer carbon sources and sinks over
the continent using model simulations. Direct budgeting puts a control
volume on top of North America, balances air mass in- and outflows into
the volume and solves for the surface fluxes. The flows are derived
from the observations through a geostatistical interpolation technique
called Kriging combined with transport fields from weather analysis.
The use of CO2 vertical profiles simulated by the atmospheric transport
model MOZART-2 at the planned 19 stations of the NACP network has given
an estimation of the error of 0.39 GtC yr(-1) within the model world.
Reducing this error may be achieved through a better estimation of mass
fluxes associated with convective processes affecting North America.
Complementary stations in the north-west and the north-east are also
needed to resolve the variability of CO2 in these regions. For
instance, the addition of a single station near 52 degrees N; 110
degrees W is shown to decrease the estimation error to 0.34 GtC yr(-1).