Changes in ocean denitrification during Late Carboniferous glacial–interglacial cycles
نویسندگان
چکیده
Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221-0013, USA Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, Texas 76019, USA Center for Applied Energy Research, 2540 Research Park Drive, Lexington, Kentucky 40511, USA Institute for Geology and Mineralogy, University of Cologne, D-50674 Cologne, Germany Barrett Honors College, Arizona State University, Tempe, Arizona 85287, USA Department of Geoscience, University of Iowa, Iowa City, Iowa 52242, USA *e-mail: [email protected]
منابع مشابه
Impact of glacial/interglacial sea level change on the ocean nitrogen cycle.
The continental shelves are the most biologically dynamic regions of the ocean, and they are extensive worldwide, especially in the western North Pacific. Their area has varied dramatically over the glacial/interglacial cycles of the last million years, but the effects of this variation on ocean biological and chemical processes remain poorly understood. Conversion of nitrate to N2 by denitrifi...
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[1] We investigate the response of the N/N of oceanic nitrate to glacial/interglacial changes in the N budget, using a geochemical box model of the oceanic N cycle that includes N2 fixation and denitrification in the sediments and suboxic water column. This model allows us to quantify the isotopic response of different oceanic nitrate pools to deglacial increases in water column and sedimentary...
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[1] Recent analysis of sedimentary dN records over the last 200,000 years has shown an expansion of water column denitrification zones during warmer periods and a shrinkage of these oxygen-poor regions during glacial periods. Two different mechanisms could be responsible for driving the changes in the denitrification records: variations in local productivity leading to a change in remineralizat...
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[1] Relaxation-type models have good skill at reproducing glacial-interglacial transitions in climatic variables. Here we propose a simple two-box and two-state relaxation-type model for the upper ocean (surface and permanent thermocline layers) where dissolved inorganic carbon/nutrients are supplied by the deep ocean and through remineralization within the upper ocean. The model is tuned using...
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[1] A physical mechanism is proposed for the glacial-interglacial variations in the rate of vertical mixing and in sea ice cover in the Southern Ocean. Such variations were postulated without an explanation by Toggweiler [1999] and Stephens and Keeling [2000], who used them to explain the glacial-interglacial CO2 variations. In the physical mechanism explored here, initially given by Gildor and...
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