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Proceedings of the NATO Advanced Research Workshop on Carbon Cycling in the Glacial Ocean: Constraints on the Ocean´s Role in Global Change, held at Fellhorst, Germany, September 17 - 19, 1992

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A comprehensive progress report on the multi-disciplinary field of ocean and climate change research is given. It compiles introductory background papers and leading scientific results on the ocean-atmosphere carbon cycle with emphasis on the ocean´s carbon inventory and the various components involved. The relationship between plankton productivity, carbon fixation, oceanic PCO2 and climate change is investigated from the viewpoint of long-term climatic change during the late Quaternary cycles of ice ages and warm ages. The various approaches range from micropaleontology over organic and trace element geochemistry to molecular isotope geochemistry.

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I - Operation of the Ocean-Atmosphere Carbon Cycle.- The recent state of carbon cycling through the atmosphere.- Glacial ocean carbon cycle modeling.- Glacial-interglacial changes in continental weathering: possible implication for atmospheric CO2.- II - Variations of the Ocean´s Carbon Reservoir: Faunal versus Geochemical Records.- The relationship between surface water masses, oceanographic fronts and paleoclimatic proxies in surface sediments of the Greenland, Iceland, Norwegian Seas.- Is there a relationship between atmospheric CO2 and manganese in the ocean?.- Benthic foraminiferal assemblages and the ?13C-signal in the Atlantic sector of the Southern Ocean: glacial-to-interglacial contrasts.- Foraminiferal population dynamics and stable carbon isotopes.- A comparison of carbon isotopes and cadmium in the modern and glacial maximum ocean: can we account for the discrepancies?.- Tracer-nutrient correlations in the upper ocean: observational and box model constraints on the use of benthic foraminiferal ?13C and Cd/Ca as paleo-proxies for the intermediate-depth ocean.- III - Geochemistry of the Organic Sediment Fraction: Constraints on the Biological Carbon Pump.- Possible early diagenetic alteration of palaeo proxies.- Nitrogen isotope fractionation in the modern ocean: implications for the sedimentary record.- The use of nitrogen isotopic ratio for reconstruction of past changes in surface ocean nutrient utilization.- Variations in sedimentary organic ?13C as a proxy for past changes in ocean and atmospheric CO2 concentrations.- Reconstruction of paleoceanic PCO2 levels from carbon isotopic compositions of sedimentary biogenic components.- Late Quaternary PCO2 variations in the Angola Current: evidence from organic carbon ?13C and alkenone temperatures.- PCO2 variations of equatorial surface water over the last 330,000 years: the ?13C record of organic carbon.- IV - Geochemical and Micropaleontological Indexes of Paleoproductivity.- Paleoproductivity: flux proxies versus nutrient proxies and other problems concerning the Quaternary productivity record.- From modern flux to paleoflux: assessment from sinking assemblages to thanatocoenosis.- Late Quaternary paleoproductivity variations in the NE and equatorial Atlantic: diatom and Corg evidence.- Glacial-Holocene paleoproductivity off western Australia: a comparison of proxy records.- Nutrient, mixing and export indices: A 250 Kyr paleoproductivity record from the western equatorial Pacific.- Dinoflagellate cysts as paleoproductivity indicators: state of the art, potential, and limits.- Deep-sea benthic foraminifers: food and bottom water masses.- The history of barium, biogenic silica and organic carbon accumulation in the Weddell Sea and Antarctic Ocean over the last 150,000 years.

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