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    C/P ratios in marine detritus (2012)
    AGU (American Geophysical Union)
    In:  Global Biogeochemical Cycles, 1 (2). pp. 155-161.
    Details
    Publication Date: 2018-04-19
    Description: Until reliable procedures have been developed to preserve the phosphorus contained in particulate matter captured by in situ pumps and sediment traps and until these procedures are applied over a wide range of locations and depths in the sea, indirect methods will have to be used to determine the C/P ratio in marine detritus. We have taken two such approaches: (1) the use of C/N ratios for particulates captured in the upper thermocline in conjunction with 02/P and N/P ratios obtained from deconvolutions of ocean chemical data and (2) regression along isopycnals in the deep‐sea waters free of fossil fuel CO2. While neither approach yields a definitive answer, both suggest that a value of 127 carbon atoms per phosphorus atom would be a more appropriate interim value than that of 106 adopted long ago by A. C. Redfield and his associates.
    Type: Article , PeerReviewed
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  • 2
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    Holocene atmospheric CO2 increase as viewed from the seafloor (2003)
    AGU (American Geophysical Union)
    In:  Global Biogeochemical Cycles, 17 (2). p. 1052.
    Details
    Publication Date: 2016-06-15
    Description: Three scenarios have been proposed to explain the 20-ppm post-8000 BP rise in atmospheric CO2 content. Indermühle et al. [1999] call on a climate-induced decrease in terrestrial biomass. W. F. Ruddiman (personal communication, 2002) calls on an anthropogenically induced decrease in terrestrial biomass. Broecker et al. [2001] suggest instead that this rise in CO2 was a response to a CaCO3 preservation event induced by an early Holocene increase in terrestrial biomass. The biomass decline hypothesis not only rests on shaky 13C data, but also requires an unreasonably large decrease in biomass (195 ± 40 GtC). While evidence for a decrease in deep sea carbonate ion concentration over the last 8000 years reconstructed from CaCO3 size index and foraminifera shell weight measurements appears to support the idea that the CO2 rise was caused by a change in the inventory of terrestrial biomass, the decrease appears to be too large to be explained solely in this way. Regardless, the CO3= decline cannot be used to distinguish between the late Holocene biomass decrease and early Holocene biomass increase scenarios. Only when a convincing 13C record for atmospheric CO2 has been generated will it be possible to make this distinction.
    Type: Article , PeerReviewed
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