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  • 1
    Electronic Resource
    Electronic Resource
    Mechanismus der Pyrylium/Pyridinium-Umwandlung; milde Bedingungen für die Gewinnung von Pyridinium-Ionen aus Aminen (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 92 (1980), S. 315-316 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19800920420
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanism of the Pyrylium/Pyridinium Ring Interconversion. Mild Preparative Conditions for Conversion of Amines into Pyridinium Ions (1980)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 19 (1980), S. 306-306 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198003061
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    Paper (German National Licenses)
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  • 3
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    Foraminifera assemblages from POLARSTERN cruise ARK-X/2 sampled at the central East Greenland shelf (Foster Bugt) (2019)
    PANGAEA
    In:  Supplement to: Perner, Kerstin; Moros, Matthias; Lloyd, Jeremy M; Jansen, Eystein; Stein, Ruediger (2015): Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water. Quaternary Science Reviews, 129, 296-307, https://doi.org/10.1016/j.quascirev.2015.10.007
    Details
    Publication Date: 2023-06-27
    Description: The relatively fresh and cold East Greenland Current (EGC) connects the Arctic with the subpolar North Atlantic Ocean. Its strength and influence on the freshwater balance in the North Atlantic affects both the Subpolar Gyre dynamics and deep convection in the Labrador Sea. Enhanced freshwater and sea-ice expansion in the subpolar North Atlantic is suggested to modify the northward heat transport within the North Atlantic Current. High-resolution palaeoceanographic reconstructions, based on planktic and benthic foraminifera assemblage data, from the central East Greenland shelf (Foster Bugt) reveal distinct centennial to millennial-scale oceanographic variability that relates to climatic changes during the mid to late Holocene (the last c. 6.3 ka BP). Our data highlight intervals of cooling and freshening of the polar surface EGC waters that accompany warming in the subsurface Atlantic waters, which are a combination of chilled Atlantic Intermediate Water (AIW) from the Arctic Ocean and of the Return Atlantic Current (RAC) from the West Spitsbergen Current (WSC). Mid Holocene thermal optimum conditions prevailed until c. 4.5 ka BP. A thin/absent surface Polar Water layer, low drift/sea-ice occurrence and strong contribution of recirculating warm Atlantic waters at the subsurface, suggest a relatively weak EGC during this period. Subsequently, between 1.4 and 4.5 ka BP, the water column became well stratified as the surface Polar Water layer thickened and cooled, indicating a strong EGC. This EGC strengthening parallelled enhanced subsurface chilled AIW contribution from the Arctic Ocean after c. 4.5 ka BP, which culminated from 1.4 to 2.3 ka BP. This coincides with warming identified in earlier work of the North Atlantic Current, the Irminger Current, and the West Greenland Current. We link the enhanced contribution of chilled AtlanticWater during this period to the time of the 'RomanWarm Period'. The observed warming offshore East Greenland, centred at c. 1.8 ka BP, likely occurred in response to changes in the interactions of i) a weakened Subpolar Gyre; ii) increased northward heat advection in the North Atlantic Current, and iii) a predominant positive North Atlantic and Arctic Oscillation mode, prevailing during the time of the Roman Warm Period.
    Keywords: Age; AGE; ARK-X/2; Cassidulina neoteretis; East Greenland Current; East Greenland Sea; Event label; Foraminifera; Foraminifera, planktic; Giant box corer; GKG; Gravity corer (Kiel type); GREENClim; Islandiella norcrossi; Mid to late Holocene; Nonionella labradorica; Percentage; Polar front; Polarstern; PS2641-4; PS2641-5; PS31; PS31/154; Return Atlantic Current; SL; Subpolar gyre; subpolar North Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 1764 data points
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  • 4
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    Alkenone data from sediment cores MSM343310 and MSM343300 in Disko Bugt used to reconstruct palaeoceanographic conditions during the middle to late Holocene (2019)
    PANGAEA
    In:  Supplement to: Moros, Matthias; Lloyd, Jeremy M; Perner, Kerstin; Krawczyk, Diana W; Blanz, Thomas; de Vernal, Anne; Ouellet‐Bernier, Marie‐Michèle; Kuijpers, Antoon; Jennings, Anne E; Witkowski, Andrzej; Schneider, Ralph R; Jansen, Eystein (2016): Surface and sub-surface multi-proxy reconstruction of middle to late Holocene palaeoceanographic changes in Disko Bugt, West Greenland. Quaternary Science Reviews, 132, 146-160, https://doi.org/10.1016/j.quascirev.2015.11.017
    Details
    Publication Date: 2023-07-20
    Description: We present new surface water proxy records of meltwater production (alkenone derived), relative sea surface temperature (diatom, alkenones) and sea ice (diatoms) changes from the Disko Bugt area off central West Greenland. We combine these new surface water reconstructions with published proxy records (benthic foraminifera - bottom water proxy; dinocyst assemblages – surface water proxy), along with atmospheric temperature from Greenland ice core and Greenland lake records. This multi-proxy approach allows us to reconstruct centennial scale middle to late Holocene palaeoenvironmental evolution of Disko Bugt and the Western Greenland coastal region with more detail than previously available. Combining surface and bottom water proxies identifies the coupling between ocean circulation (West Greenland Current conditions), the atmosphere and the Greenland Ice Sheet. Centennial to millennial scale changes in the wider North Atlantic region were accompanied by variations in the West Greenland Current (WGC). During periods of relatively warm WGC, increased surface air temperature over western Greenland led to ice sheet retreat and significant meltwater flux. In contrast, during periods of cold WGC, atmospheric cooling resulted in glacier advances. We also identify potential linkages between the palaeoceanography of the Disko Bugt region and key changes in the history of human occupation. Cooler oceanographic conditions at 3.5 ka BP support the view that the Saqqaq culture left Disko Bugt due to deteriorating climatic conditions. The cause of the disappearance of the Dorset culture is unclear, but the new data presented here indicate that it may be linked to a significant increase in meltwater flux, which caused cold and unstable coastal conditions at ca. 2 ka BP. The subsequent settlement of the Norse occurred at the same time as climatic amelioration during the Medieval Climate Anomaly and their disappearance may be related to harsher conditions at the beginning of the Little Ice Age. Highlights • Ocean temperature has a strong influence on ice sheet behaviour in West Greenland. • Similar trends in Holocene ocean and Camp Century ice core temperature proxies. • Oceanic conditions influenced the history of human occupation in West Greenland. • Results from surface and sub-surface proxies agree when meltwater influence is low. • Interpretation of surface water proxies complicated when meltwater influence is high
    Keywords: Alkenones; Holocene; multiproxy reconstructions; sea-ice; Sea surface temperature; West Greenland Current
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 5
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    Holocene palaeoceanographic evolution off West Greenland (2019)
    PANGAEA
    In:  Deutsche Forschungsgemeinschaft, Bonn | Supplement to: Perner, Kerstin; Moros, Matthias; Jennings, Anne E; Lloyd, Jeremy M; Knudsen, Karen Luise (2013): Holocene palaeoceanographic evolution off West Greenland. The Holocene, 23(3), 374-387, https://doi.org/10.1177/0959683612460785
    Details
    Publication Date: 2023-08-22
    Description: Benthic foraminiferal assemblages from a core southwest of Disko Bugt provide a Holocene perspective (last ~7 ka BP) on ice-sheet/ocean interactions between the West Greenland Current (WGC) and the West Greenland ice sheet. Changes in the fauna reveal significant variations in the water mass properties (temperature and salinity) of the WGC through time. From 7.3 to 6.2 ka BP, a relatively warm/strong WGC influences ice-sheet melt in Disko Bugt and causes enhanced meltwater production, resulting in low surface-water productivity. The most favourable oceanographic conditions occur from 5.5 to 3.5 ka BP, associated with 'thermal optimum-like' conditions, encompassing minimum ice sheet extent in the Disko Bugt area. These conditions are attributed to: (1) reduced meltwater influence as the ice sheet is land based and (2) enhanced contribution of warm/saline water masses from the Irminger Current to the WGC. The transition into the late Holocene (last ~3.5 ka BP) is characterized by a cooling of oceanographic conditions, caused by increased advection of cold/low-salinity water masses from the East Greenland Current. A longer-term late-Holocene cooling trend within the WGC is attributed to the onset of Neoglacial cooling within the North Atlantic region. Superimposed on this cooling trend, multicentennial-scale variability within the WGC matches reconstructions from a nearby coring site in Disko Bugt as follows: (1) cooling at ~2.5 ka BP, linked to the 2.7 ka BP 'cooling event'; (2) a warm phase centred at 1.8 ka BP, associated with the 'Roman Warm Period'; (3) slight warming between 1.4 and 0.9 ka BP, linked to the 'Medieval Climate Anomaly'; (4) severe cooling of the WGC after 0.9 ka BP, culminating at 0.3 ka BP during the 'Little Ice Age'. We show that multicentennial-scale palaeoceanography variability along the West Greenland margin is driven by ocean forcing, i.e. variations in the relative contribution of Atlantic (Irminger Current) and Polar (East Greenland Current) water masses to the WGC during the last ~7 ka BP, influencing ice sheet dynamics.
    Keywords: Benthic foraminifera; EGC; GREENClim; Holocene; IC; ocean forcing; WGC
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 6
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    High-resolution organic geochemical bulk parameter and biomarker records in sediment core PS100/270-1 from off eastern North Greenland (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-09
    Description: The Northeast Greenland continental shelf became one of the tipping elements in our climate system. Ongoing mass loss of the Greenland Ice Sheet, intensive sea-ice loss, the influence of warm, recirculating Atlantic Water towards the inner shelf, intensive bottom-melting at the underside of local marine-terminating outlet glaciers, glacier retreat and ice-sheet disintegration plays a fundamental role in terms of ongoing anthropogenic warming. Marine sediment Core PS100/270 was recovered aboard the RV Polarstern cruise PS100 in 2016 directly in front of 79NG on the inner NEG continental shelf (79°29.83'N, 18°8.40'W) in a water depth of 424 m. Chronology of the 9.51 m long Core PS100/270 is based on 13 AMS 14C ages, measured on benthic foraminifera. Sediment samples of Core PS100/270 were investigated to analyse microfossil assemblages, biomarker and bulk parameter proxy data. Additionally, the lithology, x-ray radiographs and geophysical properties (wet bulk density and magnetic susceptibility) were considered to perform a direct comparison with other records nearby e.g. PS2623. Four distinct lithofacies units were identified within this sedimentary record and are based on the, x-ray, lithology and biomarker data: stiff, overconsolidated diamiction; an indistinct/irregular laminated silty clay; a laminated silty clay and silty clay. Gravity Core PS100/270 was selected and studied in detail to reconstruct past sea-ice formation and ice-sheet dynamics, terrigenous input, primary productivity and the influence of warm, recirculating Atlantic Water on the shelf during the late Weichselian deglacial to late Holocene. The new high-resolution records presented here from the Northeast Greenland continental shelf provide helpful information about the pace of small- and large-scale climate variations, form the basis to improve future climate predictions and might serve as suitable analogue to ongoing anthropogenic warming by covering warmer periods in the past e.g. early Holocene Thermal Maximum.
    Keywords: 79°Glacier; Atlantic Water; Ice Sheet; Northeast Greenland; Sea ice
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 7
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    Bulk parameters determined in sediment core PS100/270-1 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-09
    Keywords: 79°Glacier; Accumulation rate, calcium carbonate; Accumulation rate, total organic carbon; AGE; ARK-XXX/2, GN05; Atlantic Water; Calcium carbonate; Carbon, inorganic, total; Carbon, organic, total; Carbon, total; DEPTH, sediment/rock; GC; Gravity corer; Ice Sheet; Northeast Greenland; North Greenland Sea; Polarstern; PS100; PS100/270-1; Sea ice; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 1004 data points
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  • 8
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    Foraminifera record in sediment core PS100/270-1 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-09
    Keywords: 79°Glacier; Accumulation rate, Cassidulina neoteretis; Accumulation rate, Cassidulina reniforme; Accumulation rate, mass; AGE; ARK-XXX/2, GN05; Atlantic Water; Cassidulina neoteretis; Cassidulina reniforme; DEPTH, sediment/rock; Foraminifera, benthic; Foraminifera, benthic, flux; Foraminifera, planktic; Foraminifera, planktic, flux; GC; Gravity corer; Ice Sheet; Northeast Greenland; North Greenland Sea; Polarstern; PS100; PS100/270-1; Sea ice
    Type: Dataset
    Format: text/tab-separated-values, 344 data points
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  • 9
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    IP25 and highly branched isoprenoids in sediment core PS100/270-1 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-09
    Keywords: (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene per unit sediment mass; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 79°Glacier; Accumulation rate, (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene; Accumulation rate, (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene; Accumulation rate, 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene; Accumulation rate, 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane; AGE; ARK-XXX/2, GN05; Atlantic Water; DEPTH, sediment/rock; GC; Gravity corer; Ice Sheet; Northeast Greenland; North Greenland Sea; Polarstern; PS100; PS100/270-1; Sea ice
    Type: Dataset
    Format: text/tab-separated-values, 1674 data points
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  • 10
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    Sterols in sediment core PS100/270-1 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Keywords: 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Ethylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; 79°Glacier; Accumulation rate, 24-Ethylcholest-5-en-3beta-ol; Accumulation rate, 24-Methylcholest-5-en-3beta-ol; Accumulation rate, 24-Methylcholesta-5,22E-dien-3beta-ol; Accumulation rate, 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; AGE; ARK-XXX/2, GN05; Atlantic Water; DEPTH, sediment/rock; GC; Gravity corer; Ice Sheet; Northeast Greenland; North Greenland Sea; Polarstern; PS100; PS100/270-1; Sea ice
    Type: Dataset
    Format: text/tab-separated-values, 1777 data points
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