Using Geosecs Atlantic, Pacific, and Indian Ocean hydrographic data, a set of ocean-specific models have been constructed to estimate the concentrations of inorganic, PO(,4)('-3) ((mu)gram-atoms/kg) in the upper water column, based upon the concentration of dissolved O(,2) (ml/l), and temperature ((DEGREES)C), assuming that the Redfield {O:P} ratio maintains. Substitution of foraminiferally-derived values of (delta)('13)C and (delta)('18)O into these ocean-specific models, as functions of dissolved O(,2) and temperature, yields a set of paleophosphate models which can be used down-core. / Calculated PO(,4)('-3) profiles for the upper water column, using observed temperature and (delta)('13)C(,(SIGMA)CO(,2)) data in the paleophosphate expressions, faithfully replicates the observed PO(,4)('-3) profiles at selected sites in all major ocean basins, between 50(DEGREES) north and 50(DEGREES) south latitude. Average PO(,4)('-3) concentrations approximated from the (delta)('13)C and (delta)('18)O of recent planktic foraminifera in the Indian Ocean, were similar to observed PO(,4)('-3) concentrations at those levels in the water column at which the organisms presumably secreted their tests. / Down-core data covering the last 18,000 years in the northern Indian Ocean suggests that at 9,000 kyBP, the upper water column in the northern Indian Ocean was more productive than at present or at 18 kyBP due presumably to a rapid overturn of old water closely following the last glacial readvance and the onset of a major warming trend. / Source: Dissertation Abstracts International, Volume: 43-12, Section: B, page: 3901. / Thesis (Ph.D.)--The Florida State University, 1982.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_75019 |
| Contributors | SOCCI, ANTHONY D., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 97 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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