The distribution of bomb-produced tritium and radiocarbon at GEOSECS station 347 in the eastern North Pacific |
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Authors: | W.S. Broecker T.-H. Peng |
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Affiliation: | Lamont-Doherty Geological Observatory of Columbia University, Palisades, NY 10964 U.S.A. |
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Abstract: | Following Roether et al. [1] an upwelling model has been tested to explain the distribution of bomb-produced tritium at the GEOSECS I test station off Baja, California. We have extended their treatment to include the time histories for tritium and for bomb radiocarbon now available for this station. If the CO2 gas exchange rate at this station is similar to the ocean average value of 20 moles/m2 yr, then the upwelling rate must be quite small (<3 m/yr). However, a satisfactory match to the time histories of14C and of3H is achieved only if an upwelling rate of 40 m/yr is used. In this case, however, a CO2 exchange rate of 70 moles/m2 yr would be required to match the observed surface water14C/C ratios and a tritium input 4 times the expected value would be needed. The inconsistency in the bomb14C time history obtained using the accepted CO2 exchange rate is likely the result of horizontal effects which void the validity of one dimensional modeling in this region of the ocean. |
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