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  • 1
    Book
    Book
    Effects of CO 2 and nutrient concentration on the stable carbon isotope composition of C37:2 alkenones in sediments of the South Atlantic Ocean (2001)
    Bremen : Fachbereich Geowiss., Univ. Bremen
    Details Availability
    Keywords: Dissertation ; Hochschulschrift ; Atlantischer Ozean Süd ; Meeressediment ; Nährstoffhaushalt ; Kohlenstoff ; Stoffhaushalt ; Enone ; Enone ; Indikator ; Kohlenstoffisotop ; Isotopengeochemie ; Paläoozeanographie ; Paläoklimatologie ; Atlantischer Ozean Süd ; Sediment ; Enone ; Isotopengeologie ; Paläoozeanographie
    Type of Medium: Book
    Pages: 104 S , graph. Darst. ,Kt
    Series Statement: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen 168
    RVK:
    RZ 70408
    Language: English
    Note: Zugl.: Bremen, Univ., Diss., 2000
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  • 2
    Online Resource
    Online Resource
    Echographiekartierung und physikalische Eigenschaften der oberflächennahen Sedimente in der Laptevsee : Diplomarbeit, Teil 2, Laborarbeit (1994)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (83 Seiten = 4 MB) , Graphen, Karten
    Edition: Online-Ausgabe
    URL: https://oceanrep.geomar.de/id/eprint/50437/
    Language: German
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 3
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    Echographiekartierung und physikalische Eigenschaften der oberflächennahen Sedimente in der Laptevsee (Teil 2, Laborarbeit) (1994)
    Details
    Publication Date: 2023-09-11
    Description: The Laptev Sea, one of the three epicontinental seas in the Siberian arctic, was the destination of the expedition TRANSDRIFT I during summer 1993. On the expedition at 47 stations sedimentcores were taken (boxcorer, 'kastenkorer'). In addition, during the whole expedition subbottom profiling (30/210 kHz) was carried out to get a continuous net of profiles. Three echotypes could be defined which show a different penetration of acoustic waves into the sediment. The penetration depends on the sediment composition. The mapping of these echotypes documents a significant distribution pattern. In the western region, the shoals, and the near shore areas the penetration is medium or low indicating sandy silt sediments. In the eastern region the penetration is in general very high due to silty clay sediments. The echo-sounding data show that the bottom of the Laptev Sea is disrupted by ice gouges. Most of them occur in water depths between 18 and 38 m. lt is suggested that most of the ice gouging in the Laptev Sea is caused by grounded ice during summer after ice break-up. The results of physical property measurements of near surface sediments (upper 15 cm) in the Laptev Sea show in general high porosities (60 to 70 %) and low shear strengths ( 4 to 8 kPa). Porosities correlate in general with grain size. Local variations due to an higher consolidation of the sediment are explained by interaction between ice and seafloor. The comparison of the echotype distribution pattern with porosities in the Laptev Sea proves that penetration of acoustic waves into the sediment extends with increasing porosities.
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 4
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    Fig. 5. The carbon isotopic composition of POC
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Europe, Norway; Mass spectrometer Europa Scientific 20/2; MESO; Mesocosm experiment; ORDINAL NUMBER; Raunefjord; δ13C, particulate organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 189 data points
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  • 5
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    Fig. 6. The carbon isotopic composition of dissolved CO2
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Europe, Norway; Mass spectrometer Europa Scientific 20/2; MESO; Mesocosm experiment; ORDINAL NUMBER; Raunefjord; δ13C, carbon dioxide, aquatic
    Type: Dataset
    Format: text/tab-separated-values, 198 data points
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  • 6
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    Fig. 6. The carbon isotopic composition of dissolved inorganic carbon
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Europe, Norway; Mass spectrometer Europa Scientific 20/2; MESO; Mesocosm experiment; ORDINAL NUMBER; Raunefjord; δ13C, dissolved inorganic carbon
    Type: Dataset
    Format: text/tab-separated-values, 91 data points
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  • 7
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    Fig. 8. The total C37-38 alkenone concentration per Emiliana huxleyi cell
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Alkenone per cell Emiliania huxleyi; Europe, Norway; MESO; Mesocosm experiment; ORDINAL NUMBER; Pressurized liquid extraction; Raunefjord
    Type: Dataset
    Format: text/tab-separated-values, 33 data points
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  • 8
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    Mesocosm bloom experiment results with the coccolithophore Emiliania huxleyi (2008)
    PANGAEA
    In:  Supplement to: Benthien, Albert; Zondervan, Ingrid; Engel, Anja; Hefter, Jens; Terbrüggen, Anja; Riebesell, Ulf (2007): Carbon isotopic fractionation during a mesocosm bloom experiment dominated by Emiliania huxleyi: Effects of CO2 concentration and primary production. Geochimica et Cosmochimica Acta, 71(6), 1528-1541, https://doi.org/10.1016/j.gca.2006.12.015
    Details
    Publication Date: 2023-05-12
    Description: We investigated the effect of CO2 and primary production on the carbon isotopic fractionation of alkenones and particulate organic matter (POC) during a natural phytoplankton bloom dominated by the coccolithophore Emiliania huxleyi. In nine semi-closed mesocosms (~11 m**3 each), three different CO2 partial pressures (pCO2) in triplicate represented glacial (~180 ppmv CO2), present (380 ppmv CO2), and year 2100 (~710 ppmv CO2) CO2 conditions. The largest shift in alkenone isotopic composition (4-5 per mil) occurred during the exponential growth phase, regardless of the CO2 concentration in the respective treatment. Despite the difference of ~500 ppmv, the influence of pCO2 on isotopic fractionation was marginal (1-2 per mil). During the stationary phase, E. huxleyi continued to produce alkenones, accumulating cellular concentrations almost four times higher than those of exponentially dividing cells. Our isotope data indicate that, while alkenone production was maintained, the interaction of carbon source and cellular uptake dynamics by E. huxleyi reached a steady state. During stationary phase, we further observed a remarkable increase in the difference between d13C of bulk organic matter and of alkenones spanning 7-12 per mil. We suggest that this phenomenon is caused mainly by a combination of extracellular release of 13C-enriched polysaccharides and subsequent particle aggregation induced by the production of transparent exopolymer particles (TEP).
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 9
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    Experiment: The effect of temperature, salinity and growth rate on the stable hydrogen isotopic composition of long chain alkenones produced by Emiliania huxleyi and Gephyrocapsa oceanica (2006)
    PANGAEA
    In:  Supplement to: Schouten, Stefan; Ossebaar, Jort; Schreiber, Karolin; Kienhuis, Michiel V M; Langer, Gerald; Benthien, Albert; Bijma, Jelle (2006): The effect of temperature, salinity and growth rate on the stable hydrogen isotopic composition of long chain alkenones produced by Emiliania huxleyi and Gephyrocapsa oceanica. Biogeosciences, 3(1), 113-119, https://doi.org/10.5194/bg-3-113-2006
    Details
    Publication Date: 2023-12-22
    Description: Two haptophyte algae, Emiliania huxleyi and Gephyrocapsa oceanica, were cultured at different temperatures and salinities to investigate the impact of these factors on the hydrogen isotopic composition of long chain alkenones synthesized by these algae. Results showed that alkenones synthesized by G. oceanica were on average depleted in D by 30 compared to those of E. huxleyi when grown under similar temperature and salinity conditions. The fractionation factor, alpha alkenones-H2O, ranged from 0.760 to 0.815 for E. huxleyi and from 0.741 to 0.788 for G. oceanica. There was no significant correlation of alpha alkenones-H2O with temperature but a positive linear correlation was observed between alpha alkenones-H2O and salinity with ~3 change in fractionation per salinity unit and a negative correlation between alpha alkenones-H2O and growth rate. This suggests that both salinity and growth rate can have a substantial impact on the stable hydrogen isotopic composition of long chain alkenones in natural environments.
    Keywords: Alkenone, unsaturation index UK'37; Fractionation factor; Growth rate; Salinity; Species; Strain; Temperature, water; δ Deuterium, alkenone, C37; δ Deuterium, alkenone, C38; δ Deuterium, standard deviation; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 247 data points
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  • 10
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    Sea surface temperatures reconstructed from alkenones of surface sediment samples of the Argentine Basin at stations GeoB1501-1 to GeoB2830-1 (2000)
    PANGAEA
    In:  Supplement to: Benthien, Albert; Müller, Peter J (2000): Anomalously low alkenone temperatures caused by lateral particle and sediment transport in the Malvinas Current region, western Argentine Basin. Deep Sea Research Part I: Oceanographic Research Papers, 47(12), 2369-2393, https://doi.org/10.1016/S0967-0637(00)00030-3
    Details
    Publication Date: 2024-02-02
    Description: We analysed the alkenone unsaturation ratio (UK'37) in 87 surface sediment samples from the western South Atlantic (5°N–50°S) in order to evaluate its applicability as a paleotemperature tool for this part of the ocean. The measured UK'37 ratios were converted into temperature using the global core-top calibration of Müller et al. (1998, doi:10.1016/S0016-7037(98)00097-0) and compared with annual mean atlas sea-surface temperatures (SSTs) of overlying surface waters. The results reveal a close correspondence (〈1.5°C) between atlas and alkenone temperatures for the Western Tropical Atlantic and the Brazil Current region north of 32°S, but deviating low alkenone temperatures by -2° to -6°C are found in the regions of the Brazil–Malvinas Confluence (35–39°S) and the Malvinas Current (41–48°S). From the oceanographic evidence these low UK'37 values cannot be explained by preferential alkenone production below the mixed layer or during the cold season. Higher nutrient availability and algal growth rates are also unlikely causes. Instead, our results imply that lateral displacement of suspended particles and sediments, caused by strong surface and bottom currents, benthic storms, and downslope processes is responsible for the deviating UK'37 temperatures. In this way, particles and sediments carrying a cold water UK'37 signal of coastal or southern origin are transported northward and offshore into areas with warmer surface waters. In the northern Argentine Basin the depth between displaced and unaffected sediments appears to coincide with the boundary between the northward flowing Lower Circumpolar Deep Water (LCDW) and the southward flowing North Atlantic Deep Water (NADW) at about 4000 m.
    Keywords: Alkenone, unsaturation index UK'37; Amazon Fan; Argentine Basin; Brazil Basin; Calculated; Calculated from C37 alkenones (Prahl & Wakeham, 1987); Calculated from UK'37 (Müller et al, 1998); Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; GeoB; GeoB1501-1; GeoB1503-2; GeoB1504-1; GeoB1506-1; GeoB1514-4; GeoB1515-2; GeoB2022-3; GeoB2101-1; GeoB2102-1; GeoB2104-1; GeoB2105-3; GeoB2106-1; GeoB2107-5; GeoB2108-1; GeoB2109-3; GeoB2110-1; GeoB2111-2; GeoB2112-1; GeoB2116-2; GeoB2117-4; GeoB2118-1; GeoB2119-2; GeoB2124-1; GeoB2125-2; GeoB2126-1; GeoB2130-1; GeoB2201-1; GeoB2202-5; GeoB2204-1; GeoB2205-4; GeoB2206-1; GeoB2207-2; GeoB2208-1; GeoB2212-1; GeoB2213-1; GeoB2215-8; GeoB2216-2; GeoB2701-4; GeoB2703-6; GeoB2703-7; GeoB2705-7; GeoB2706-6; GeoB2707-4; GeoB2708-5; GeoB2712-1; GeoB2714-5; GeoB2715-1; GeoB2717-8; GeoB2718-1; GeoB2719-1; GeoB2719-3; GeoB2722-1; GeoB2722-2; GeoB2723-2; GeoB2724-6; GeoB2724-7; GeoB2727-1; GeoB2729-1; GeoB2730-1; GeoB2731-1; GeoB2734-2; GeoB2801-2; GeoB2802-2; GeoB2803-1; GeoB2804-2; GeoB2805-1; GeoB2806-6; GeoB2807-1; GeoB2808-3; GeoB2809-2; GeoB2810-2; GeoB2811-1; GeoB2812-3; GeoB2813-1; GeoB2814-3; GeoB2817-3; GeoB2818-1; GeoB2819-2; GeoB2820-1; GeoB2821-2; GeoB2824-1; GeoB2825-3; GeoB2826-1; GeoB2827-2; GeoB2828-1; GeoB2829-3; GeoB2830-1; Geosciences, University of Bremen; Giant box corer; GKG; Latitude of event; Longitude of event; M16/2; M23/1; M23/2; M23/3; M29/1; M29/2; Meteor (1986); MUC; MultiCorer; Rio Grande Rise; Santos Plateau; Sea surface temperature, annual mean; Slope off Argentina; Uruguay continental margin; Δδ18O
    Type: Dataset
    Format: text/tab-separated-values, 481 data points
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