Figure 3.9: Anthropogenic
CO2 in the Atlantic Ocean (mmol/kg): comparison of data and models.
The top left panel shows the sampling transect; the top right panel shows estimates
of anthropogenic CO2 content along this transect using observations
from several cruises between 1981 and 1989 (Gruber, 1998). Anthropogenic CO2
is not measured directly but is separated from the large background of oceanic
carbon by an indirect method based on observations (Gruber et al., 1996). The
remaining panels show simulations of anthropogenic CO2 content made
with four ocean carbon models forced by the same atmospheric CO2 concentration
history (Orr et al., 2000).