219 resultados para 4300
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A marine sediment core from Vaigat in Disko Bugt, West Greenland, has been analysed in terms of lithology, dinoflagellate cysts and foraminifera in order to evaluate the influence of oceanographic variability on West Greenland glacier stability. The data show that during the past 5200 years the Atlantic foraminiferal abundance in the subsurface waters of the West Greenland Current (WGC) episodically increased, indicating periods of increases in the inflow of subsurface warm Atlantic water at 2000 - 1500 cal. yr BP and 1300 cal. yr BP as well as periods of less pronounced increased bottom-water temperatures around 4700 - 4000 cal. yr BP, 3100 - 2800, 2600, 1000 - 800, 500 - 400, and at 200 cal. yr. The sedimentological and dinoflagellate cyst data indicate that these episodes with enhanced advection of Irminger Sea-derived waters are accompanied by increased iceberg rafting, which we link to increased iceberg calving in relation to destabilization of the Jakobshavn Isbrae. The long-term trend in the data documents the end of a late-Holocene Thermal Maximum between 5200 and 4300 cal. yr BP and a final onset of the Neoglaciation at 3500 cal. yr BP. Increased responses of the iceberg rafting after 3500 cal. yr BP, reflects a westward/seaward advance of the glacier margin in relation to onset of Neoglaciation and a development of the glacier into a floating tongue after 2000 cal. yr BP. A comparison of our record with a record from the eastern North Atlantic indicates that a NAO-like anomaly pattern between subsurface waters in West Greenland and atmospheric temperature in the Eastern North Atlantic may have been operating during most of the late Holocene. However, during the past 1000 years the NAO signal may have weakened as some other mode of climate variability overprints the anti-phase climate signal in this region.
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Benthic foraminifers were studied in upper Eocene to Recent core-catcher samples from DSDP Sites 573, 574, and 575. The sites are on a north-south transect from the equator to about 05°N at about 133°W, water depth 4300 to 4600 m. At Site 574 additional samples were used to study the Eocene/Oligocene boundary in detail. About 200 specimens were counted per sample. The fauna is highly diverse (about 50 to 70 species per sample) and is of low dominance. The diversity is not related to age or sub-bottom depth. Many species are cosmopolitan and probably have wide environmental tolerances. Fluctuations in frequency of some taxa (e.g., Nuttallides umbonifera, Epistominella exigua, and Uvigerina spp.) cannot be correlated from one site to another. Several common species (e.g. Oridorsalis umbonatus and Globocassidulina subglobosa) range from late Eocene to Recent. First and last appearances are generally difficult to define precisely because many species are rare. For some species these datums differ from one site to another, but several datum levels are within 1 m.y. at all sites. First and last appearances are most numerous in two intervals, the late Eocene to early Oligocene (about 32 to 37 Ma) and the early to middle Miocene (about 13 to 18.5 Ma). Isotopic events occur within each of these periods of benthic faunal change, but the isotopic events have a shorter duration and start after the initiation of the changes in the fauna. Changes in deep-sea benthic faunal composition are not directly related to short-term oceanographic changes as expressed in isotopic records.
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Editors vary.
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Brunet, 4300
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Mode of access: Internet.
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"20 June 1973"--P. 1.
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Kahn & Wilby, architect. J.L. Stuart, contractor. Built 1913. Bulk of cost from the will of Regent Arthur Hill. Seated 4300 when built. Housed the original Frieze Memorial Organ from 1913 to 1928. When organ was replaced, Frieze name was retained.
Resumo:
Kahn & Wilby, architect. J.L. Stuart, contractor. Built 1913. Bulk of cost from the will of Regent Arthur Hill. Seated 4300 when built. Housed the original Frieze Memorial Organ from 1913 to 1928. When organ was replaced, Frieze name was retained. Image is faded.
Resumo:
Kahn & Wilby, architect. J.L. Stuart, contractor. Built 1913. Bulk of cost from the will of Regent Arthur Hill. Seated 4300 when built. Housed the original Frieze Memorial Organ from 1913 to 1928. When organ was replaced, Frieze name was retained.
Resumo:
Kahn & Wilby, architect. J.L. Stuart, contractor. Built 1913. Bulk of cost from the will of Regent Arthur Hill. Seated 4300 when built. Housed the original Frieze Memorial Organ from 1913 to 1928. When organ was replaced, name was retained. On verso: Please return to Shirley W. Smith, Secy. & Bus. Manager, Univ. of Michigan, Ann Arbor, Mich.
Resumo:
Kahn & Wilby, architect. J.L. Stuart, contractor. Built 1913. Bulk of cost from the will of Regent Arthur Hill. Seated 4300 when built. Housed the original Frieze Memorial Organ from 1913 to 1928. When organ was replaced, name was retained.
Resumo:
Kahn & Wilby, architect. J.L. Stuart, contractor. Built 1913. Bulk of cost from the will of Regent Arthur Hill. Seated 4300 when built. Housed the original Frieze Memorial Organ from 1913 to 1928. When organ was replaced, name was retained.
Resumo:
Kahn & Wilby, architect. J.L. Stuart, contractor. Built 1913. Bulk of cost from the will of Regent Arthur Hill. Seated 4300 when built. Housed the original Frieze Memorial Organ from 1913 to 1928. When organ was replaced, name was retained.
Resumo:
Kahn & Wilby, architect. J.L. Stuart, contractor. Built 1913. Bulk of cost from the will of Regent Arthur Hill. Seated 4300 when built. Housed the original Frieze Memorial Organ from 1913 to 1928. When organ was replaced, name was retained.
Resumo:
Kahn & Wilby, architect. J.L. Stuart, contractor. Built 1913. Bulk of cost from the will of Regent Arthur Hill. Seated 4300 when built. Housed the original Frieze Memorial Organ from 1913 to 1928. When organ was replaced, name was retained.