|
Strategic
Plan for the
Climate Change
Science Program
Final Report, July 2003
|
Figure 7-4
from Annex C
(Graphics and Photography Source Information)
Figure 7-4: Map showing the climatological mean annual distribution
of net sea-air CO2 flux (moles CO2 m-2 yr-1)
over the global oceans in a reference year 1995. The blue-magenta areas
indicate that the ocean is a sink for atmospheric CO2, and the
yellow-red areas, a source. The annual CO2 uptake by the oceans
has been estimated to be in the range of 1.5 to 2.1 PgC. This map has been
constructed on the basis of about 1.4 million measurements of partial
pressure of CO2 (pCO2) in surface waters made during
the past 40 years. The sea-air pCO2 difference is computed
using atmospheric CO2 concentrations from the
GLOBALVIEW-CO2
data set compiled by CMDL/NOAA. The monthly net sea-air CO2
flux in each 4_ x 5_ pixel area has been estimated using the NCEP 41-mean
wind speed at 10 meters. Source: After Takahashi et al. (2002).
Reference: Takahashi, T., Sutherland, S.C., Sweeney, C., Poison, A., Metzl,
N., Tilbrook, B., Bates, N., Wanninkhof, R., Feely, R.A., Sabine, C.,
Olafsson, J., and Nojiri, Y., 2002: Global sea-air CO2 flux
based on climatological surface ocean pCO2, and seasonal
biological and temperature effects. Deep Sea Research II, 49,
1601-1622.
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