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  • 1
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    (Table 1) Lithology and N isotope ratios of DSDP Hole 41-367
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 41-367; Carbon/Nitrogen ratio; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Isotope ratio mass spectrometry; Leg41; Lithology/composition/facies; North Atlantic/BASIN; Sample code/label; δ15N, bulk sediment
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 2
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    (Table 1) Lithology, N isotope ratios and carbonate content of DSDP Hole 93-603B
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 93-603B; Calcium carbonate; Carbon, organic, total; Carbon/Nitrogen ratio; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Hydrogen index, mass HC, per unit mass total organic carbon; Isotope ratio mass spectrometry; Leg93; Lithology/composition/facies; Sample code/label; δ13C, carbonate; δ15N, bulk sediment
    Type: Dataset
    Format: text/tab-separated-values, 88 data points
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  • 3
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    (Table 1) Lithology, N isotope ratios and carbonate content of DSDP Hole 75-530A
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 75-530A; Calcium carbonate; Carbon/Nitrogen ratio; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Isotope ratio mass spectrometry; Leg75; Lithology/composition/facies; Sample code/label; South Atlantic/RIDGE; δ15N, bulk sediment
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
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  • 4
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    Nitrogen isotope ratios of Cretaceous Atlantic sedimentary sequences
    PANGAEA
    In:  Supplement to: Rau, Greg H; Arthur, Michael A; Dean, Walter E (1987): 15N/14N variations in Cretaceous Atlantic sedimentary sequences: implication for past changes in marine nitrogen biogeochemistry. Earth and Planetary Science Letters, 82(3-4), 269-279, https://doi.org/10.1016/0012-821X(87)90201-9
    Details
    Publication Date: 2023-06-27
    Description: At two locations in the Atlantic Ocean (DSDP Sites 367 and 530) early to middle Cretaceous organic-carbon-rich beds (black shales) were found to have significantly lower delta15N values (lower 15N/14N ratios) than adjacent organic-carbon-poor beds (white limestones or green claystones). While these lithologies are of marine origin, the black strata in particular have delta15N values that are significantly lower than those previously found in the marine sediment record and most contemporary marine nitrogen pools. In contrast, black, organic-carbon-rich beds at a third site (DSDP Site 603) contain predominantly terrestrial organic matter and have C- and N-isotopic compositions similar to organic matter of modern terrestrial origin. The recurring 15N depletion in the marine-derived Cretaceous sequences prove that the nitrogen they contain is the end result of an episodic and atypical biogeochemistry. Existing isotopic and other data indicate that the low 15N relative abundance is the consequence of pelagic rather than post-depositional processes. Reduced ocean circulation, increased denitrification, and, hence, reduced euphoric zone nitrate availability may have led to Cretaceous phytoplankton assemblages that were periodically dominated by N2-fixing blue-green algae, a possible source of this sediment 15N-depletion. Lack of parallel isotopic shifts in Cretaceous terrestrially-derived nitrogen (Site 603) argues that the above change in nitrogen cycling during this period did not extend beyond the marine environment.
    Keywords: 41-367; 75-530A; 93-603B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg41; Leg75; Leg93; North Atlantic/BASIN; South Atlantic/RIDGE
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 5
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    Estimate of mid-Pliocene Paleo-pCO2 for ODP Hole 130-806 (Table 1) (1996)
    PANGAEA
    In:  Supplement to: Raymo, Maureen E; Grant, B; Horowitz, Michael; Rau, Greg H (1996): Mid-Pliocene warmth: stronger greenhouse and stronger conveyor. Marine Micropaleontology, 27(1-4), 313-326, https://doi.org/10.1016/0377-8398(95)00048-8
    Details
    Publication Date: 2024-01-09
    Description: Three million years ago, prior to the onset of northern hemisphere glaciation, global mean temperatures may have been as much as 3.5 °C warmer than at present. We present evidence, based on the carbon isotopic composition of marine organic matter, that atmospheric CO2 levels at this time were on average only about 35% higher than the preindustrial value of 280 ppm. We also present carbon isotopic evidence for stronger thermohaline circulation in the Atlantic Ocean during the warmest intervals and propose that the North Atlantic “conveyor belt” may act as a positive feedback to global warming by enhancing sea ice retreat and decreasing high latitude albedo. Based on our results, it seems unlikely that the mid Pliocene warm period was a doubled CO, world.
    Keywords: -; 130-806; AGE; Carbon/Nitrogen ratio; COMPCORE; Composite Core; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Joides Resolution; Leg130; North Pacific Ocean; Ocean Drilling Program; ODP; Partial pressure of carbon dioxide (ambient atmosphere); Sample code/label; Sea surface temperature, annual mean; δ13C, dissolved inorganic carbon; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 571 data points
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  • 6
    Electronic Resource
    Electronic Resource
    Another recipe for bomb 14 C dilution (1991)
    [s.l.] : Nature Publishing Group
    Nature 350 (1991), S. 116-116 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - As recently pointed out by Druffel and Williams1 and Toggweiler2, the relatively low amount of atom-bomb-derived 14C in deep-ocean particulate organic carbon (POC) has significant implications for the way carbon is cycled in the ocean's interior. Druffel and Williams conclude that the low ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/350116a0
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  • 7
    Electronic Resource
    Electronic Resource
    Low 15 N/ 14 N in hydrothermal vent animals: ecological implications (1981)
    [s.l.] : Nature Publishing Group
    Nature 289 (1981), S. 484-485 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has been argued11-19 that local bacterial chemo-autotrophy is the primary source of biomass and energy for the dense invertebrate communities found at Pacific Ocean hydrothermal vents. Part of the evidence for vent primary production is the difference between the I3C/12C of vent animals and the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/289484a0
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  • 8
    Electronic Resource
    Electronic Resource
    Latitudinal variations in plankton δ 13 C: implications for CO 2 and productivity in past oceans (1989)
    [s.l.] : Nature Publishing Group
    Nature 341 (1989), S. 516-518 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Plankton of the South Atlantic Ocean and Weddell Sea (Antarctica) exhibit a dramatic decrease in 513C as a function of both latitude and sea surface temperature (Fig. Ib). This isotope trend does not parallel the relatively constant 613C of the associated total dissolved inorganic carbon TCO2 (Fig. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/341516a0
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  • 9
    Electronic Resource
    Electronic Resource
    Use of 13C/12C to trace dissolved and particulate organic matter utilization by populations of an aquatic invertebrate (1981)
    Springer
    Oecologia 48 (1981), S. 19-21 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The 13C/12C of limnephilid caddisfly larvae (Clistoronia magnifica) grown in the presence of red alder leaf particulate organic matter (POM) and alder leaf leachate was found to be identical to the 13C/12C of larvae grown on alder POM, but with isotopically contrasting grass leachate substituted for the above alder leachate. The isotopic similarity between these insects and the alder POM common in both treatments indicates that grass leachate was not a source of insect carbon. In contrast to these results, the 13C/12C of larvae grown on grass POM and leachate was markedly different from the 13C/12C of larvae raised on grass POM and alder leachate. The relative 13C depletion found in larvae from the latter treatment could be accounted for only if a significant amount of carbon derived from alder leachate had been incorporated into insect biomass. Significant differences in yield of insect biomass among the above treatments also were found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346983
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  • 10
    Electronic Resource
    Electronic Resource
    Emergence of chironomidae from Findley Lake in the coniferous forest of the cascade mountains after early and late thaws (1996)
    Springer
    Hydrobiologia 318 (1996), S. 85-101 
    Details
    ISSN: 1573-5117
    Keywords: Chironomidae ; Procladius ; Tanytarsus ; Orthocladius ; emergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chironomidae were collected in floating emergence traps on 27.5 m deep Findley Lake in the coniferous forest of the Cascade Mountains, USA, from 1972 to 1975. There was considerable yearly variation in the date of thaw, the total number of Chironomidae that emerged and the relative abundance of each species. In 1972, 1973 and 1975 when there were early thaws, Tanytarsus and Procladius were the most common Chironomidae. Many of the common species started to emerge before the lake had completely thawed. In 1973 when most of the lake thawed June 7 and the surface water reached a maximum temperature of 19.25 °C in July, the Tanytarsus chinyensis group, Stictochironomus and Chironomus started to emerge from deep water when there was still ice along shore. Procladius nr gretis and Orthocladius started to emerge two days after the last ice had melted. In 1974 when most of the lake did not thaw until July 30–31, the surface water reached a maximum temperature of only 12.5 °C in August. Only a fifth as many Chironomidae emerged as in 1973. Most of these were Procladius and Orthocladius which had their maximum emergence when most of the lake was still frozen. The emergence of each species was reduced except Orthocladius. Procladius contributed the greatest biomass that emerged each year, but the second greatest biomass was contributed by different genera each year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014135
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