Utility of multiple tracer distributions in calibrating models for uptake of anthropogenic CO/sub 2/ by the ocean thermocline
Two-dimensional thermocline ventilation models for the temperate North Atlantic with differing circulation patterns were calibrated to yield a tritium distribution similar to that observed during the GEOSECS survey. These models were then run for /sup 3/He, bomb-produced /sup 14/C, radiokrypton, and freons. They were also run for the uptake of fossil fuel CO/sub 2/. While the models differ significantly in their ability to match the observed /sup 3/He and /sup 14/C distributions, these differences are not large enough to clearly single out one model as superior. This insensitivity of tracer-to-tracer ratio to model design is reflected by the near identity of the fossil fuel CO/sub 2/ uptake by the various models. This result suggests that the uptake of CO/sub 2/ by the sea is limited more by the rates of physical mixing within the sea than by gas exchange across the sea surface. If so, then the hope that models employing outcropping isopycnals will enhance the CO/sub 2/ uptake by the sea and thereby lead to a narrowing in the gap that exists for anthropogenic CO/sub 2/ budgets is not well founded. The interim strategy of using reservoir models calibrated by tracer distributions appears to be sound. 20 references, 19 figures, 5 tables.
- Research Organization:
- Oak Ridge National Lab., TN
- DOE Contract Number:
- AC05-84OR21400; AC02-79EV10041
- OSTI ID:
- 5883853
- Journal Information:
- J. Geophys. Res.; (United States), Vol. 90:C4
- Country of Publication:
- United States
- Language:
- English
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MATHEMATICAL MODELS
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OCEANIC CIRCULATION
ATLANTIC OCEAN
CARBON 14
CARBON CYCLE
COMPARATIVE EVALUATIONS
HELIUM 3
TRACER TECHNIQUES
VENTILATION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON ISOTOPES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HELIUM ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
NUCLEI
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SURFACE WATERS
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