Biogenic opal estimation of deep-sea sediment cores from the Scotia Sea

We present biogenic opal flux records from two deep-sea sites in the Scotia Sea (MD07-3133 and MD07-3134) at decadal-scale resolution, covering the last glacial cycle. Besides conventional and time-consuming biogenic opal measuring methods, we introduce new biogenic opal estimation methods derived from sediment colour b*, wet bulk density, Si/Ti-count ratio, and Fourier transform infrared spectroscopy (FTIRS). All methods capture the biogenic opal amplitude, however, FTIRS - a novel method for marine sediment - yields the most reliable results. 230Th normalization data show strong differences in sediment focusing with intensified sediment focusing during glacial times. At MD07-3134 230Th normalized biogenic opal fluxes vary between 0.2 and 2.5 g/cm2/kyr. Our biogenic opal flux records indicate bioproductivity changes in the Southern Ocean, strongly influenced by sea ice distribution and also summer sea surface temperature changes. South of the Antarctic Polar Front, lowest bioproductivity occurred during the Last Glacial Maximum when upwelling of mid-depth water was reduced and sea ice cover intensified. Around 17 ka, bioproductivity increased abruptly, corresponding to rising atmospheric CO2 contents and decreasing seasonal sea ice coverage.

Address before the Alumni Society of Hanover College : August 18th, 1846 /

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An address delivered before the Society of the alumni of Dartmouth college, at their first triennial meeting, July 25, 1885.

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An address delivered before the Society of Alumni of Miami University : at their anniversary, August 13th, 1840 /

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Proceedings of the Royal Society of Edinburgh.

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Soil biology as related to land use practices : proceedings of the VII International Soil Zoology Colloquium of the International Society of Soil Science (ISSS) /

Item 473-B-1

Gongora in the library of the Hispanic Society of America.

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The Papers of the Bibliographical Society of America.

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Act of incorporation, constitution and by-laws of the National society of the Daughters of the American revolution.

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Index of the Rolls of honor (ancestor's index) in the Lineage books of the National society of the Daughters of the American revolution, volumes 41 to 80.

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Early engraved ivories in the collection of the Hispanic Society of America from excavations by George Edward Bonsor ...

Engraved ivory found in graves discovered in Los Alcores hills. cf. Pref.

Bell-founders in Lancashire and Cheshire and the adjacent counties, in the seventeenth and eighteenth centuries; a paper, read before the Historic Society of Lancashire and Cheshire, 6th March, 1890.

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Transactions - Botanical Society of Edinburgh.

Proceedings included in all volumes except v. 2-4 (in v. 1 called "Extracts from the minute-book," 1839-43).

The great landlords of London,

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Annual of the Boston Society of natural history, 1868-69.

Contains act of incorporation, constitution, sketch of the history of the society, list of members, list of publications, etc., etc.