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  • 1
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    Sea-surface temperature reconstructions over 30-40 ka, supplement data to Jensen et al. 2018 (2018)
    PANGAEA
    In:  Supplement to: Jensen, Mari F; Nummelin, Aleksi; Nielsen, Søren B; Sadatzki, Henrik; Sessford, Evangeline; Risebrobakken, Bjørg; Andersson, Carin; Voelker, Antje H L; Roberts, William H G; Pedro, Joel B; Born, Andreas (2018): A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8. Climate of the Past, 14(6), 901-922, https://doi.org/10.5194/cp-14-901-2018
    Details
    Publication Date: 2023-12-08
    Description: Here we establish a spatio-temporal evolution of the sea-surface temperatures in the North Atlantic over Dansgaard-Oeschger (DO) events 5-8 (c.30-40ka) using the proxy surrogate reconstruction method. Proxy data suggest a large variability in North Atlantic sea-surface temperatures during the DO-events of the last glacial period. However, proxy data availability is limited and cannot provide a full spatial picture of the oceanic changes. Therefore, we combine fully coupled, general circulation model simulations with planktic foraminifera based sea-surface temperature reconstructions to obtain a broader spatial picture of the ocean state during DO-events 5-8. The resulting spatial sea-surface temperature patterns agree over a number of different general circulation models and simulations. We find that sea-surface temperature variability over the DO-events is characterized by colder conditions in the subpolar North Atlantic during stadials than during interstadials, and the variability is linked to changes in the Atlantic Meridional Overturning circulation, and in the sea-ice cover. Forced simulations are needed to capture the strength of the temperature variability and to reconstruct the variability in other climatic records not directly linked to the sea-surface temperature reconstructions. This is the first time the proxy surrogate reconstruction method has been applied to oceanic variability during MIS3. Our results remain robust, even when age uncertainties of proxy data, the number of available temperature reconstructions, and different climate models, are considered. However, we also highlight shortcomings of the methodology that should be addressed in future implementations.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    Sea surface temperature anomalies in the North Atlantic, 30-40ka, from the proxy surrogate reconstruction method (2018)
    PANGAEA
    Details
    Publication Date: 2023-12-08
    Description: Here we establish a spatio-temporal evolution of the sea-surface temperature anomalies in the North Atlantic over Dansgaard Oeschger (DO) events 5-8 (30-40ka) using the proxy surrogate reconstruction method. We combine fully coupled, general circulation model simulations with planktic foraminifera based sea-surface temperature reconstructions to obtain a broader spatial picture of the ocean state during DO-events 5-8. Here, the model simulations consists of 10 simulations with HadCM3, 8 runs without freshwater forcing and 2 runs with freshwater forcing. These simulations were run by Paul J. Valdes, Joy S. Singarayer and William H.G. Roberts. A description of the simulations can be found in Singarayer and Valdes (2010). All model simulations were run using the University of Bristol's ACRC facilities, (www.acrc.bris.ac.uk). This is the first time the proxy surrogate reconstruction method has been applied to oceanic variability during MIS3. The sea-surface temperature reconstructions should be used with care.
    Type: Dataset
    Format: application/x-netcdf, 7.8 MBytes
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  • 3
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    Sea surface temperature estimates from several sediment cores in the North Atlantic (2017)
    PANGAEA
    Details
    Publication Date: 2024-04-16
    Description: Here, we have calculated new sea-surface temperature estimates over Dansgaard-Oeschger (DO) events 5-8 (c. 30-40 ka) from 14 sites in the North Atlantic, based on previously published planktic foraminifera relative abundance datasets. These proxy records suggest a large variability in North Atlantic sea-surface temperatures during DO-events of the last glacial period. However, proxy data availability is limited and cannot provide a full spatial picture of the oceanic changes. Therefore, we combine fully coupled, general circulation model simulations with the planktic foraminifera based sea-surface temperature reconstructions to obtain a broader spatial picture of the ocean state during DO-events 5-8. The resulting spatial sea-surface temperature patterns agree over a number of different general circulation models and simulations. We find that sea-surface temperature variability over the DO-events is characterized by colder conditions in the subpolar North Atlantic during stadials than during interstadials, and the variability is linked to changes in the AMOC, and in the sea-ice cover. Forced simulations are needed to capture the strength of the temperature variability and to reconstruct the variability in other climate records not directly linked to the sea-surface temperature reconstructions.
    Keywords: 162-983A; 3664N/S; 94-609_Site; AGE; ALIENOR; Arctic Ocean; CALYPSO; Calypso Corer; Calypso Square Core System; CASQS; CH69-K09; COMPCORE; Composite Core; Depth, bottom/max; Depth, composite; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; GC; GEOSCIENCES, MARMARCORE; GIK15612-2; GIK23415-9; Glomar Challenger; Gravity corer; Gravity corer (Kiel type); IMAGES I; IMAGES V; Jan Mayen; JM96; JM96-1225/2-GC; Joides Resolution; KAL; Kasten corer; KOL; Leg162; Leg94; Le Suroît; M17/2; M57; Marion Dufresne (1995); Maximum-likelihood estimation (MLE); MD01-2461; MD04-2829CQ; MD04-2845; MD101; MD114; MD123; MD141; MD952010; MD95-2010; MD99-2284; Meteor (1964); Meteor (1986); N. Shetland channel; Newfoundland margin; North Atlantic; North Atlantic/FLANK; Northeast Atlantic; North East Atlantic; Norwegian Sea; PALEOCINAT; PALEOCINAT II; PC; Piston corer; Piston corer (Kiel type); Reconstructed from the percentage of Neogloboquadrina pachyderma sinistral; REYKJANES-RÜCKEN; Sample code/label; Sea surface temperature; SL; SO82; SO82_5-2; Sonne; South Atlantic Ocean; SU90-24; SU92; SU92-03; Voring Plateau
    Type: Dataset
    Format: text/tab-separated-values, 2141 data points
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  • 4
    Electronic Resource
    Electronic Resource
    Population Ageing, Public Debt and Sustainable Fiscal Policy (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Fiscal studies 16 (1995), S. 0 
    Details
    ISSN: 1475-5890
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-5890.1995.tb00219.x
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  • 5
    Electronic Resource
    Electronic Resource
    Photosynthetic use of inorganic carbon among primary and secondary water plants in streams (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 27 (1992), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. We analysed photosynthetic rates and inorganic carbon use of thirty-five vascular macrophyte species collected submerged in eight nutrient- and CO2-rich Danish lowland streams. The species were classified in four groups as mainly terrestrial, homophyllous and heterophyllous amphibious and truly submerged. These groups represent plant species differently adapted to life in water.2. Photosynthetic rates measured in water increased in the gradual transition from mainly terrestrial, through amphibious to truly submerged species. Species normally in contact with air adapted to submergence by increasing the photosynthetic rate at limiting CO2. Photosynthetic rates of submerged parts of heterophyllous amphibious species were close to those of submerged species. Submerged species with thin or finely dissected leaves had the highest photosynthetic rates, probably because of low diffusional resistance to uptake of nutrients and gases.3. In contrast to submerged species, terrestrial and amphibious species were unable to use HCO3−. Extensive oversaturation with CO2 in the streams allows, however, many amphibious species to photosynthesize well under water, based on CO2-use alone. Amphibious CO2-users, with very few structural adaptations to life under water, can therefore be as dominant in the submerged vegetation of lowland streams as HCO3−-using water plants. Moreover, the streams provide open space for colonization from the dense vegetation ashore.4. Among the 1265 Danish herbaceous species no less than seventy-five terrestrial species occasionally grow submerged, forty-five species are amphibious, and fifty-one are true water plants. These numbers suggest that adaptation to permanent or temporary submergence is an ongoing process involving many species and that the land-water interface does not represent as difficult a barrier as often believed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1992.tb00540.x
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  • 6
    Electronic Resource
    Electronic Resource
    Binding and Endocytosis of Proteins Mediated by Epithelial gp330 (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 737 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb44306.x
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  • 7
    Electronic Resource
    Electronic Resource
    Ultrastructure, Pharmacologic Inhibition, and Transport Selectivity of Aquaporin CHIP in Proteoliposomes (1994)
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 1606-1615 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00172a042
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  • 8
    Electronic Resource
    Electronic Resource
    CELLULAR AND MOLECULAR BIOLOGY OF THE AQUAPORIN WATER CHANNELS (1999)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 68 (1999), S. 425-458 
    Details
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Notes: Abstract The high water permeability characteristic of mammalian red cell membranes is now known to be caused by the protein AQP1. This channel freely permits movement of water across the cell membrane, but it is not permeated by other small, uncharged molecules or charged solutes. AQP1 is a tetramer with each subunit containing an aqueous pore likened to an hourglass formed by obversely arranged tandem repeats. Cryoelectron microscopy of reconstituted AQP1 membrane crystals has revealed the three-dimensional structure at 3-6 A. AQP1 is distributed in apical and basolateral membranes of renal proximal tubules and descending thin limbs as well as capillary endothelia. Ten mammalian aquaporins have been identified in water-permeable tissues and fall into two groupings. Orthodox aquaporins are water-selective and include AQP2, a vasopressin-regulated water channel in renal collecting duct, in addition to AQP0, AQP4, and AQP5. Multifunctional aquaglyceroporins AQP3, AQP7, and AQP9 are permeated by water, glycerol, and some other solutes. Aquaporins are being defined in numerous other species including amphibia, insects, plants, and microbials. Members of the aquaporin family are implicated in numerous physiological processes as well as the pathophysiology of a wide range of clinical disorders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.biochem.68.1.425
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  • 9
    Electronic Resource
    Electronic Resource
    Hypomagnesemia with secondary hypocalcemia is caused by mutations in TRPM6 , a new member of the TRPM gene family (2002)
    [s.l.] : Nature Publishing Group
    Nature genetics 31 (2002), S. 166-170 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Magnesium is an essential ion involved in many biochemical and physiological processes. Homeostasis of magnesium levels is tightly regulated and depends on the balance between intestinal absorption and renal excretion. However, little is known about specific proteins mediating transepithelial ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng889
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  • 10
    Electronic Resource
    Electronic Resource
    Planning Your Own Debt (2002)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    European financial management 8 (2002), S. 0 
    Details
    ISSN: 1468-036X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: We model the Danish market for mortgage backed securities with a two-factor interest rate model and use a stochastic programming approach to analyse how an individual home-owner should initially compose and subsequently readjust his mortgage in an optimal way. Results show that the ‘rules of thumb’ used by financial institutions are reasonable, although best suited for more aggressive mortgagors, for whom the delivery option is of some value. More risk-averse investors should also re-adjust frequently, but use more diversified portfolios. Results are insensitive to whether a one- or two-factor model is used, provided the former is suitably calibrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1468-036X.00184
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