American Geophysical Union (AGU)
0883-8305
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Các bài báo tiêu biểu
Barium in Deep‐Sea Sediment: A Geochemical Proxy for PaleoproductivityWe used sediment traps to define the particulate fluxes of barium and organic carbon and investigate the use of barium as a proxy for ocean fertility. Strong correlations between Corg and Ba fluxes indicate a link between upper ocean biological processes and barium flux to the seafloor. The ratio of organic carbon to barium decreases systematically with water depth. Da... ...
Tập 7 Số 2 - Trang 163-181 - 1992
Mo–total organic carbon covariation in modern anoxic marine environments: Implications for analysis of paleoredox and paleohydrographic conditionsSedimentary molybdenum, [Mo]s , has been widely used as a proxy for benthic redox potential owing to its generally strong enrichment in organic‐rich marine facies deposited under oxygen‐depleted conditions. A detailed analysis of [Mo]s –total organic carbon (TOC) covariation in modern anoxic marine environments and its relationship to ambient water c... ...
Tập 21 Số 1 - 2006
Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time seriesPaired Mg/Ca and δ18 O measurements on planktonic foraminiferal species (G. ruber white, G. ruber pink, G. sacculifer , G. conglobatus , G. aequilateralis , O. universa , N. dutertrei , ...
Tập 18 Số 2 - 2003
Processes controlling the organic carbon content of open ocean sedimentsUse of sedimentary organic carbon concentrations as a record of paleoceanographic conditions is complicated by an insufficient understanding of the mechanisms controlling present‐day variations in the organic matter content of surface open ocean sediments. This paper is a review of organic carbon distributions in marine sediments, the global marine balance of particulate and dissolved orga... ...
Tập 3 Số 5 - Trang 621-634 - 1988
Benthic phosphorus regeneration, net primary production, and ocean anoxia: A model of the coupled marine biogeochemical cycles of carbon and phosphorusWe examine the relationships between ocean ventilation, primary production, water column anoxia, and benthic regeneration of phosphorus using a mass balance model of the coupled marine biogeochemical cycles of carbon (C) and phosphorus (P). The elemental cycles are coupled via the Redfield C/P ratio of marine phytoplankton and the C/P ratio of organic matter preserved in marine sediments. ... ...
Tập 9 Số 5 - Trang 677-692 - 1994
Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 yearsBased on detailed reconstructions of global distribution patterns, both paleoproductivity and the benthic δ13 C record of CO2 , which is dissolved in the deep ocean, strongly differed between the Last Glacial Maximum and the Holocene. With the onset of Termination I about 15,000 years ago, the new (export) production of low‐ and mid‐latitude upwellin... ...
Tập 3 Số 3 - Trang 361-399 - 1988
Paleoenvironmental Changes in the Japan Sea During the Last 85,000 YearsFive distinct changes in the paleoenvironment of the Japan Sea within the last 85,000 years are revealed from the sedimentary record of a piston core recovered from the Oki Ridge. Changes in both surface and deepwater conditions are registered by changes in lithology, calcium carbonate content, organic carbon content, oxygen and carbon isotope ratios, and microfossil assemblages including ... ...
Tập 6 Số 4 - Trang 499-518 - 1991
Early Cenozoic decoupling of the global carbon and sulfur cyclesChanges in carbon and sulfur cycling over geologic time may have caused considerable modification of atmospheric and oceanic composition and climate. Here we calculate pyrite sulfur (Spy ) and organic carbon (Corg ) burial rates from recently improved Cenozoic stable isotope records, and from these rates we infer global changes in Corg...
Tập 18 Số 4 - 2003
Potential links between surging ice sheets, circulation changes, and the Dansgaard‐Oeschger Cycles in the Irminger Sea, 60–18 KyrSurface and deepwater paleoclimate records in Irminger Sea core SO82‐5 (59°N, 31°W) and Icelandic Sea core PS2644 (68°N, 22°W) exhibit large fluctuations in thermohaline circulation (THC) from 60 to 18 calendar kyr B.P., with a dominant periodicity of 1460 years from 46 to 22 calendar kyr B.P., matching the Dansgaard‐Oeschger (D‐O) cycles in the Greenland Ice Sheet Project 2 (GISP2) temper... ...
Tập 15 Số 4 - Trang 425-442 - 2000
Fluctuations in the trophic resource continuum: A factor in global diversity cycles?The trophic resource continuum (TRC) in euphotic zones of the world's oceans is the spectrum of conditions from the richest runoff and upwelling areas to the most nutrient deficient subtropical seas. That spectral range has likely varied through geologic history as more efficient phytoplankton taxa evolved, as oceanic circulation rates changed, and in response to oceanic‐mixing events. Red... ...
Tập 2 Số 5 - Trang 457-471 - 1987