Physics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..445k&link_type=abstract
Earth and Planetary Science Letters, Volume 64, Issue 3, p. 445-456.
Physics
10
Scientific paper
A two-box ocean reservoir model is employed to examine the combined effects of vertical ocean circulation, organic matter extraction and cosmic ray production on the 14C/12C in the atmosphere, ocean and sediment. In this model, dissolution of deep-sea calcium carbonate sediment is assumed to respond to the supply of particulate carbonate from the surface ocean and to the dissolved carbonate-ion concentration of the deep-sea.
If the vertical ocean circulation decreased by 50% during the maximum rate of deglaciation, the atmospheric 14C/12C would have increased concurrently by 10% relative to the pre-bomb present. Further, if cosmic ray production of 14C was 50% greater than present at about 7800 years B.P. as suggested by archeomagnetic measurements, a double maximum of 10% occurs. The first is at about 10.5 ka and the second at 6.5 ka. This result is similar to the variation of 14C/12C over the last 10,000 years calculated from the 14C dates measured by Stuiver on the varved Lake of the Clouds. The result is not sensibly altered if 1017 moles of organic carbon is extracted from the ocean during sea-level rise.
Reduction of the thermohaline ocean circulation by 50% over a one- to two-thousand-year interval would not be sensibly detected in the dating of deep-sea sediment. If Broecker's organic nutrient extraction occurs in conjunction with reduction of vertical circulation, a decrease in the atmospheric PCO2 will precede the eventual rise.
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