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1

Buch

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)

Benthien, Albert

Bremen : Fachbereich Geowiss., Univ. Bremen

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Schlagwort(e): Dissertation ; Hochschulschrift ; Atlantischer Ozean Süd ; Meeressediment ; Nährstoffhaushalt ; Kohlenstoff ; Stoffhaushalt ; Enone ; Enone ; Indikator ; Kohlenstoffisotop ; Isotopengeochemie ; Paläoozeanographie ; Paläoklimatologie ; Atlantischer Ozean Süd ; Sediment ; Enone ; Isotopengeologie ; Paläoozeanographie

Materialart: Buch

Seiten: 104 S , graph. Darst. ,Kt

Serie: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen 168

RVK:

RZ 70408

Sprache: Englisch

Anmerkung: Zugl.: Bremen, Univ., Diss., 2000

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2

Online-Ressource

Echographiekartierung und physikalische Eigenschaften der oberflächennahen Sedimente in der Laptevsee : Diplomarbeit, Teil 2, Laborarbeit (1994)

Benthien, Albert [VerfasserIn]

Kiel

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Schlagwort(e): Hochschulschrift

Materialart: Online-Ressource

Seiten: 1 Online-Ressource (83 Seiten = 4 MB) , Graphen, Karten

Ausgabe: Online-Ausgabe

URL: https://oceanrep.geomar.de/id/eprint/50437/

Sprache: Deutsch

Anmerkung: Zusammenfassung in deutscher und englischer Sprache

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Echographiekartierung und physikalische Eigenschaften der oberflächennahen Sedimente in der Laptevsee (Teil 2, Laborarbeit) (1994)

Benthien, Albert

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Publikationsdatum: 2023-09-11

Beschreibung: 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.

Materialart: Thesis , NonPeerReviewed

Format: text

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Fig. 5. The carbon isotopic composition of POC

Benthien, Albert ; Zondervan, Ingrid ; Engel, Anja ; [weitere]

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Publikationsdatum: 2023-05-12

Schlagwort(e): Europe, Norway; Mass spectrometer Europa Scientific 20/2; MESO; Mesocosm experiment; ORDINAL NUMBER; Raunefjord; δ13C, particulate organic carbon

Materialart: Dataset

Format: text/tab-separated-values, 189 data points

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Fig. 6. The carbon isotopic composition of dissolved CO2

Benthien, Albert ; Zondervan, Ingrid ; Engel, Anja ; [weitere]

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Publikationsdatum: 2023-05-12

Schlagwort(e): Europe, Norway; Mass spectrometer Europa Scientific 20/2; MESO; Mesocosm experiment; ORDINAL NUMBER; Raunefjord; δ13C, carbon dioxide, aquatic

Materialart: Dataset

Format: text/tab-separated-values, 198 data points

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Fig. 6. The carbon isotopic composition of dissolved inorganic carbon

Benthien, Albert ; Zondervan, Ingrid ; Engel, Anja ; [weitere]

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Publikationsdatum: 2023-05-12

Schlagwort(e): Europe, Norway; Mass spectrometer Europa Scientific 20/2; MESO; Mesocosm experiment; ORDINAL NUMBER; Raunefjord; δ13C, dissolved inorganic carbon

Materialart: Dataset

Format: text/tab-separated-values, 91 data points

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Fig. 8. The total C37-38 alkenone concentration per Emiliana huxleyi cell

Benthien, Albert ; Zondervan, Ingrid ; Engel, Anja ; [weitere]

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Publikationsdatum: 2023-05-12

Schlagwort(e): Alkenone per cell Emiliania huxleyi; Europe, Norway; MESO; Mesocosm experiment; ORDINAL NUMBER; Pressurized liquid extraction; Raunefjord

Materialart: Dataset

Format: text/tab-separated-values, 33 data points

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Mesocosm bloom experiment results with the coccolithophore Emiliania huxleyi (2008)

Benthien, Albert ; Zondervan, Ingrid ; Engel, Anja ; [weitere]

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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

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Publikationsdatum: 2023-05-12

Beschreibung: 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).

Materialart: Dataset

Format: application/zip, 4 datasets

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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)

Schouten, Stefan ; Ossebaar, Jort ; Schreiber, Karolin ; [weitere]

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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

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Publikationsdatum: 2023-12-22

Beschreibung: 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.

Schlagwort(e): 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

Materialart: Dataset

Format: text/tab-separated-values, 247 data points

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Physical oceanography during RV HEINCKE cruise HE603 (2023)

Tippenhauer, Sandra ; Hoppmann, Mario ; Benthien, Albert

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Publikationsdatum: 2024-01-12

Beschreibung: Conductivity-temperature-depth profiles were measured using a Seabird SBE 911plus CTD during RV Heincke cruise HE603. The CTD was equipped with duplicate sensors for temperature (SBE3plus), conductivity (SBE4) and oxygen (SBE43). Additional sensors such as a WET Labs C-Star transmissometer, a WET Labs ECO-AFL fluorometer and an altimeter (PSA-916 Teledyne (Benthos)) were mounted to the CTD. Temperature, conductivity and oxygen sensors are calibrated by the manufacturer once a year before being mounted in January. They are used throughout the year and no post-cruise or in-situ calibration is applied. All other sensors are calibrated irregularly. Data were connected to the station book of the specific cruise as available in the DSHIP database. Processing of the data including removal of obvious outliers followed the procedures described in CTD Processing Logbook of RV Heincke (hdl:10013/epic.47427). The processing report for this dataset is linked below.

Schlagwort(e): Attenuation, optical beam transmission; AWI_PhyOce; Chlorophyll a; Conductivity; CTD; CTD, Sea-Bird, SBE 911plus; CTD, Sea-Bird, SBE 911plus, measured with Temperature sensor, Sea-Bird, SBE3plus; CTD, Sea-Bird, SBE 911plus; calculated using SBE Data Processing Version 7.22.5; CTD, Sea-Bird, SBE 911plus; calculated using SBE Data Processing Version 7.22.5 and SEAWATER Routines; CTD, Sea-Bird, SBE 911plus; Calculation according to Morgan (1994; SEAWATER Routines); CTD, Sea-Bird, SBE 911plus; measured with Conductivity sensor, Sea-Bird, SBE 4; CTD, Sea-Bird, SBE 911plus; measured with Fluorometer, WET Labs, ECO-AFL; CTD, Sea-Bird, SBE 911plus; measured with Transmissometer, WET Labs, C-Star; CTD/Rosette; CTD-RO; Date/Time of event; Density, sigma-theta (0); DEPTH, water; Event label; GEOTRACES; HE603; HE603_1-1; HE603_1-2; Heincke; Latitude of event; Longitude of event; North Sea; Number of observations; Oxygen; Oxygen saturation; Physical Oceanography @ AWI; Pressure, water; Salinity; Temperature, water; Temperature, water, potential

Materialart: Dataset

Format: text/tab-separated-values, 1124 data points

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