429 resultados para Gebhardt, Ihno


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IMAGES core MD01-2416 (51°N, 168°E) provides the first centennial-scale multiproxy record of Holocene variation in North Pacific sea-surface temperature (SST), salinity, and biogenic productivity. Our results reveal a gradual decrease in subarctic SST by 3-5 °C from 11.1 to 4.2 ka and a stepwise long-term decrease in sea surface salinity (SSS) by 2-3 p.s.u. Early Holocene SSS were as high as in the modern subtropical Pacific. The steep halocline and stratification that is characteristic of the present-day subarctic North Pacific surface ocean is a fairly recent feature, developed as a product of mid-Holocene environmental change. High SSS matched a salient productivity maximum of biogenic opal during Bølling-to-Early Holocene times, reaching levels similar to those observed during preglacial times in the warm mid-Pliocene prior to 2.73 Ma. Similar productivity spikes marked every preceding glacial termination of the last 800 ka, indicating recurrent short-term events of mid-Pliocene-style intense upwelling of nutrient-rich Pacific Deepwater in the Pleistocene. Such events led to a repeated exposure of CO2-rich deepwater at the ocean surface facilitating a transient CO2 release to the atmosphere, but the timing and duration of these events repudiate a long-term influence of the subarctic North Pacific on global atmospheric CO2 concentration.

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Contiene : T. 1 -- T. 3 -- T. 4 -- T. 5 -- T. 6 -- T. 6 (continuación)

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En t. 6 tomada ... por Victor Gebhardt.

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Tomo 8 por Pablo Lacroix.

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Abhandlungen über den mathematischen Unterricht in Deutschland veranlasst durch die Internationale mathematische Unterrichtskommission, hrsg. von F. Klein, bd. 3.

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p. 206-208 advertising matter.

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"Sonderabdruck aus Gebhardt, Handbuch der deutschen Geschichte. 4. Aufl."

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Mode of access: Internet.