LATE QUATERNARY PALEOCHEMISTRY OF HIGH-LATITUDE

Keigwin, L. D. and Boyle, E. A., 1989. Late Quaternary paleochemistry of high-latitude surface waters. Palaeogeogr., Palaeoclimatol., Palaeoecol. 73:85 106. Recent studies have stressed the role of high latitude nutrient levels and productivity in controlling the carbon isotopic composition of the d...

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Bibliographic Details
Main Authors: Surface Waters, L. D. Ke Igwin, E. A. Boyle, Woods Hole, Ma (u. S. A
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 1988
Subjects:
Pacific
North Atlantic
Northeast Atlantic
Planktonic foraminifera
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.457.4050
http://ic.ucsc.edu/~acr/BeringResources/Articles of interest/Central Artic/Keigwin and Boyle 1989.pdf
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Summary:Keigwin, L. D. and Boyle, E. A., 1989. Late Quaternary paleochemistry of high-latitude surface waters. Palaeogeogr., Palaeoclimatol., Palaeoecol. 73:85 106. Recent studies have stressed the role of high latitude nutrient levels and productivity in controlling the carbon isotopic composition of the deep sea and the CO: content of the atmosphere. We undertook a study of the chemical composition of the polar planktonic foraminifer Neogloboquadrina p chyderma (s., sinistral coiling) from 30 late Holocene samples and 49 down core records from the high-latitude North and South Atlantic Oceans to evaluate the history of sea surface chemical change from glacial to interglacial time. Stable isotopic analysis of coretop samples from the Atlantic, Pacific and Southern Oceans hows no significant correlation between the 513C of N. pachyderma and either 513C or PO 4 in seawater. Conversely, Cd/Ca ratios in planktonic foraminifera are consistent with the PO 4 content of surface waters. The level of maximum glaciation (18,000 yr B.P.), identified by CLIMAP and 51sO, was chosen for mapping. Isopleths of 51sO on N. pachyderma (s.) in the North Atlantic reveal a pattern largely influenced by sea surface temperature (S.S.T.) and generally support he S.S.T. reconstruction f CLIMAP. Differences between the two suggest significantly lower salinity in North Atlantic surface waters at high latitudes than in lower latitudes. Down core ~3C records of N. pachyderma confirm that low 5~3C values occurred in the northeast Atlantic during

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