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Volumn 286, Issue 5439, 1999, Pages 520-523

Slope water current over the Laurentian Fan on interannual to millennial time scares

Author keywords

[No Author keywords available]

Indexed keywords

CONTINENTAL SLOPE; CURRENT VELOCITY; LITTLE ICE AGE; NORTH ATLANTIC OSCILLATION; PALEOCEANOGRAPHY; PALEOCLIMATE; SEA LEVEL PRESSURE;

EID: 0033569418     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.286.5439.520     Document Type: Article
Times cited : (121)

References (26)
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    • R. S. Pickart et al., J. Phys. Oceanogr. 29, 2541 (1999); G. T. Csanady and P. Hamilton, Continental Shelf Res. 8, 565 (1988). Pickart et al. computed the empirical orthogonal functions of slope water variability based on repeat temperature and salinity sections near 55°W. A dominant mode was identified where the lateral position of the slope water front shifts on interannual time scales, correlated with variability of the deeper components of the slope water. Although variability of the deep components of this system is expected on NAO time scales (3, 5), there is no clear mechanism linking the NAO and the surface slope water current.
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    • Pickart et al. computed the empirical orthogonal functions of slope water variability based on repeat temperature and salinity sections near 55°W. A dominant mode was identified where the lateral position of the slope water front shifts on interannual time scales, correlated with variability of the deeper components of the slope water. Although variability of the deep components of this system is expected on NAO time scales (3, 5), there is no clear mechanism linking the NAO and the surface slope water current
    • R. S. Pickart et al., J. Phys. Oceanogr. 29, 2541 (1999); G. T. Csanady and P. Hamilton, Continental Shelf Res. 8, 565 (1988). Pickart et al. computed the empirical orthogonal functions of slope water variability based on repeat temperature and salinity sections near 55°W. A dominant mode was identified where the lateral position of the slope water front shifts on interannual time scales, correlated with variability of the deeper components of the slope water. Although variability of the deep components of this system is expected on NAO time scales (3, 5), there is no clear mechanism linking the NAO and the surface slope water current.
    • (1988) Continental Shelf Res. , vol.8 , pp. 565
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    • note
    • Samples were extruded from the core tubes, sliced into 1-cm layers, and bagged. Subsamples were taken for micropaleontological study of the fraction >150 μm and for percent carbonate analysis with an automated gasometric technique. Sediment color was measured with a Colortron spectrophotometer and is presented using the "Lab" system [CIE Colorimetry 15.2 (1986)].
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    • On the Scotian Margin, about half the glacial maximum to modern sedimentary section is this red sediment (22), and its thickness is even greater on the fan (7)
    • The red clay-rich sediments that compose this facies are thought to derive from subglacial turbidite flow out of the Gulf of St. Lawrence [D. A. V. Stow, Am. Assoc. Petrol. Geol. 65, 375 (1981)]. On the Scotian Margin, about half the glacial maximum to modern sedimentary section is this red sediment (22), and its thickness is even greater on the fan (7).
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    • with a reservoir correction of 440 years. Age models were based on a linear fit of the ages to depth. For MC-25 the data are nearly linear, whereas for MC-13 there are age reversals of up to a few hundred years (Table 1). For this core, the age model is assumed to be linear from the origin to the deepest dated sample. Any other reasonable age model for MC-13 and MC-25 would still correctly identify the LIA near the core top, but ages of events deeper than about 10 cm in these cores are probably not known to better than ±200 years
    • 14C measurements (Table 1) were made at the National Ocean Sciences AMS facility at Woods Hole on mixed planktonic foraminifera. Ages were converted to calendar years, according to Stuiver and Reimer [M. Stuiver and P. J. Reimer, Radiocarbon 35, 215 (1993)], with a reservoir correction of 440 years. Age models were based on a linear fit of the ages to depth. For MC-25 the data are nearly linear, whereas for MC-13 there are age reversals of up to a few hundred years (Table 1). For this core, the age model is assumed to be linear from the origin to the deepest dated sample. Any other reasonable age model for MC-13 and MC-25 would still correctly identify the LIA near the core top, but ages of events deeper than about 10 cm in these cores are probably not known to better than ±200 years.
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    • The relationship between percent N. pachyderma data from North Atlantic core tops and SST was presented by Kohfeld et al. (15). They showed that N. pachyderma blooms in the summer at high latitudes, whereas the only time series data on N. pachyderma growth in subpolar locations showed that the bloom occurs in the spring [L. R. Sautter and R. C. Thunell, J. Foram. Res. 19, 253 (1989)].
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    • note
    • Although we do not have chronologies for these cores, the maximum percent N. pachyderma is found at the 3-cm level in each: 56% at MC-19 and 41% at MC-21.
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    • L. D. Keigwin and G. A. Jones, Deep-Sea Res. 36, 845 (1989); L. D. Keigwin and G. A. Jones, J. Geophys. Res. 99, 12,397 (1994).
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    • note
    • Oceanus cruise 326 and this research were funded by the National Science Foundation. We thank L. A. Conroy, K. Elder, C. E. Franks, J. Kelleher, E. Roosen, D. Torres, and the staff of the National Ocean Sciences AMS Facility for their assistance; R. Schmitt, I. N. McCave, and D. Oppo for reading the manuscript; and N. Driscoll, J. Grotzinger, and M. McCartney for helpful discussions.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.