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Subpolar North Atlantic Circulation at 9300 yr BP: Faunal Evidence

Published online by Cambridge University Press:  20 January 2017

W.F. Ruddiman  and
L.K. Glover
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Abstract

We have examined the circulation of the subpolar North Atlantic at 9300 yr BP by using a dispersed layer of silicic volcanic ash as a synchronous horizon. At the level of this datum, we have reconstructed from foraminiferal evidence a geologically synoptic view of seasonal variations in sea-surface temperatures and salinities. The reconstruction defines two oceanic fronts at 9300 yr BP: (1) the meridionally oriented Polar Front bordering the axis of deglacial outflow of Arctic and Laurentide ice and meltwater and (2) a zonal portion of the Subarctic Convergence along 48° N, marking a major confluence between the subtropical and subpolar gyres. The 9300-yr configuration primarily differed from the modern pattern in the more easterly position (by 3°) of the Polar Front and the more southerly (3°) and easterly (5°) position of the Subarctic Convergene. Both fronts had been merged at 18,000 yr BP into the full-glacial Polar Front; at 9300 yr BP, they were approaching the end of a northwestward deglacial retreat toward the modern interglacial positions.

There were two dominant departures at 9300 yr BP from the Earth's modern configuration, both related to deglaciation: the very large Laurentide Ice Sheet still covering eastern North America to 48° N, and the region of cold Arctic/Laurentide deglacial outflow. These two features caused: a more easterly position than now of the region of upper air divergence and lower air convergence downstream from the Ice Sheet and meltwater outflow; a more intense expression of this upper air divergence and lower air convergence over the central portion of the subpolar North Atlantic; and a latitudinally more stable axis of convergence of surface westerlies over this region. These factors apparently caused the stronger oceanic convergence along 48°N than at present. They also created a stronger, southeastward-directed wind drift current, which opposed the meridional (northward) flow typical of the present interglaciation.

Type
Research Article
Information
Quaternary Research , Volume 5 , Issue 3 , September 1975 , pp. 361 - 389
Copyright
University of Washington

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References

Andrews, J.T., (1973). The Wisconsin Laurentide Ice sheet: dispersal centers, problems of rates of retreat and climatic implications. Arctic Alpine Research 5, 185–199.CrossRefGoogle Scholar
Bé, A.W.H., Hamlin, W.H., (1967). Ecology of Recent planktonic foraminifera, 3. Micropaleontology 13, 87–106.Google Scholar
Berger, W.H., (1970). Planktonic foraminifera: Selective solution and the lysocline. Marine Geology 8, 111–138.CrossRefGoogle Scholar
Berger, W.H., Heath, G.R., (1968). Vertical mixing in pelagic sediments. Journal of Marine Research 26, 135–143.Google Scholar
Bjerknes, J., (1959). The recent warning of the North Atlantic. Bolin, B., The Atmosphere and the Sea in Motion. Rossby Memorial Volume Oxford and Rockefeller Inst. Press N.Y 65–73.Google Scholar
Bjerknes, J., (1963). Climatic changes as an ocean-atmosphere problem. Proceedings of the Arid Zone Research Series XX. WMO-UNESCO Rome 1961 Symposium on Changes of Climate UNESCO Paris 297–321.Google Scholar
Bjerknes, J., (1966). Ocean-atmosphere interaction (Macroprocesses). Fairbridge, R.W., The Encyclopedia of Oceanography Reinhold Publ. Corp N.Y 563–571.Google Scholar
Bloom, A.L., (1971). Glacial-eustatic and isostatic controls of sea level since the last glaciation. Turekian, K.K., The Late Cenozoic Glacial Ages Yale University Press 355–380.Google Scholar
Bradshaw, J.S., (1959). Ecology of living planktonic foraminifera in the North and Equatorial Pacific Ocean. Contributions from the Cushman Foundation for Foraminiferal Research 10, 25–64.Google Scholar
Bramlette, M.N., Bradley, W.H., (1941). Geology and biology of North Atlantic deepsea cores between Newfoundland and Ireland: 1. Lithology and geological interpretation. U. S. Geological Survey Professional Paper 196-A, 1–34.Google Scholar
Bryson, R.A., Wendland, W.M., Ives, J.D., Andrews, J.T., (1969). Radiocarbon isochrones on the disintegration of the Laurentide Ice Sheet. Arctic Alpine Research 1, 1–14.CrossRefGoogle Scholar
Defant, A., (1961). Physical Oceanography. Pergamon Press Oxford.Google Scholar
Dietrich, G., (1964). Oceanic Polar Front survey in the North Atlantic. Research in Geophysics 2, 291–308.Google Scholar
Ekman, V.W., (1905). On the influence of the earth's rotation on ocean currents. Arkiv. for Matermaktik, Astronomi ocn Fysik (Uppsala) 2, 1–53.Google Scholar
Fenner, D.F., Bucca, P.J., (1971). The Sound Velocity Structure of the North Atlantic Ocean. Naval Oceanographic Office Informal Report 71-13 Washington, D.C..Google Scholar
Fisher, R.V., (1965). Settling velocity of glass shards. Deep-Sea Research 12, 345–353.Google Scholar
Flint, R.F., (1971). Glacial and Quaternary Geology. John Wiley and Sons N.Y.Google Scholar
Gates, W.L., (1974). Numerical Simulation of Ice-Age Climate. Abstracts, American Geophysical Union Spring Meetings (Washington, D.C.).Google Scholar
Imbrie, J., Kipp, N.G., (1971). A new micropaleontological method for quantitative paleoclimatology: Application to a Late Pleistocene Caribbean core. Turekian, K.K., Late Cenozoic Glacial Ages Yale University Press New Haven 71–181.Google Scholar
Kellogg, T.B., (1975). Late Quaternary climatic changes: evidence from deep-sea cores of Norwegian and Greenland seas. Memoir 145, Geological Society of America .Google Scholar
Kipp, N.G., (1975). New transfer function for estimating past sea-surface conditions from sea-bed distribution of planktonic foraminiferal assemblages in the North Atlantic. Memoir 145, Geological Society of America .Google Scholar
Lamb, H.H., (1955). Two-way relationships between the snow or ice limit and 1000-500 mb thicknesses in the overlying atmosphere. Quarterly Journal of the Royal Meteorological Society 81, 172–189.CrossRefGoogle Scholar
Lamb, H.H., (1971). Fundamentals of climate. Narin, A.E.M., Descriptive Paleoclimatology Interscience N.Y 21–57.Google Scholar
Lamb, H.H., (1971). Climates and circulation regimes developed over the northern hemisphere during and since the last ice age. Paleogeography, Paleoclimatology, and Paleoecology 10, 125–162.CrossRefGoogle Scholar
Lamb, H.H., (1972). Fundamentals and Climate Now. Climate: Present, Past and Future Vol. I, Methuen and Co, Ltd 613.Google Scholar
Lamb, H.H., Woodroffe, A., (1970). Atmospheric circulation during the last Ice Age. Quaternary Research 1, 29–58.CrossRefGoogle Scholar
Lazier, J.R.N., (1973). The renewal of Labrador Sea Water. Deep-Sea Research 20, 341–353.Google Scholar
McIntyre, A., Ruddiman, W.F., Jantzen, R., (1972a). Southward penetrations of the North Atlantic polar front: faunal and floral evidence of large-scale surface water mass movements over the last 225,000 years. Deep-Sea Research 19, 61–77.Google Scholar
McIntyre, A., Bé, A., Biscaye, P., Burckle, L., Gardner, J., Geitzenauer, K., Goll, R., Kellog, T., Prell, W., Roche, M., Imbrie, J., Kipp, N., Ruddiman, W., Moore, T., Heath, R., (1972b). The glacial North Atlantic 17,000 years ago: Paleoisotherm and oceanographic maps derived from floral-faunal parameters by CLIMAP. Geological Society of America Annual Meeting 590–591(Abstracts).Google Scholar
McIntyre, A., Kipp, N.G., Bé, A.W.H., Crowley, T., Gardner, J., Prell, W., Ruddiman, W.F., (1975). The Glacial North Atlantic: 18,000 years ago:A CLIMAP Reconstruction. Memoir 145, Geological Society of America .Google Scholar
Manley, G., (1951). The range of variation of the British climate. Geographical Journal 117, 43–68.CrossRefGoogle Scholar
Munk, W.H., (1950). On the wind-driven ocean circulation. Journal of Meteorology 7, 79–93.2.0.CO;2>CrossRefGoogle Scholar
Namias, J., (1962). Influences of abnormal heat sources and sinks on atmospheric behaviour. Proceedings of the International Symposium on Numerical Weather Prediction (Tokyo) Meteorological Society of Japan 615–629.Google Scholar
Namias, J., (1972). Space scales of sea-surface temperature patterns and their causes. Fishery Bulletin 70, 611–617.Google Scholar
Neumann, G., (1960). On the effect of bottom topography on ocean currents. Deutsche Hydrografika Zeitschrift 13, 132–140.CrossRefGoogle Scholar
Phleger, F.B., (1954). Foraminifera and deep-sea research. Deep-Sea Research 1, 1–23.Google Scholar
Prantner, G.D., (1961). Jet stream climatology at 500 mb north of 50° N. U.S.N. Weather Research Facility Task 20, 137(Norfolk, Va.).Google Scholar
Reiter, E.R., (1963). Jet Stream Meteorology. University of Chicago Press.Google Scholar
Rodewald, M., (1963). Sea-surface temperatures of the North Atlantic ocean during the decade 1951–1960, their anomalies and development in relation to the atmospheric circulation. Proceedings of the WMO-UNESCO Rome 1961 Symposium, Changes of Climate. Arid Zone Research Series XX UNESCO Paris 97–107.Google Scholar
Ruddiman, W.F., Glover, L.K., (1972). Vertical mixing of ice-rafted volcanic ash in North Atlantic sediments. Geological Society of America Bulletin 83, 2817–2836.CrossRefGoogle Scholar
Ruddiman, W.F., McIntyre, A., (1973). Time-transgressive deglacial retreat of Polar Water from the North Atlantic. Quaternary Research 3, 117–130.CrossRefGoogle Scholar
Ruddiman, W.F., McIntyre, A., (1975). Northeast Atlantic paleoclimatic changes over the last 600,000 years. Memoir 145, Geological Society of America .Google Scholar
Sancetta, C., Imbrie, J., Kipp, N.G., (1973). Climatic record of the past 130,000 years in North Atlantic deep sea cove V23-82: Correlation with the terrestrial record. Quaternary Research 3, 110–116.CrossRefGoogle Scholar
Sawyer, J.S., (1965). Notes on the Possible Physical Causes of Long-Term Weather Anomalies. WMO/IUGG Symposium on Research and Development Aspects of Long Range Forecasting. WM-No. 162, TP79, Technical Note 6.Google Scholar
Sverdrup, H.U., (1955). Discussions on the relationship between meteorology and oceanography. Journal of Marine Research 14, 501–503.Google Scholar
Tolderlund, D.S., Bé, A.W.H., (1971). Seasonal distribution of planktonic foraminifera in the western North Atlantic. Micropaleontology 17, 297–329.CrossRefGoogle Scholar
U. S. Naval Oceanographic Office(1967). Oceanographic Atlas of the North Atlantic Ocean. Publication 700, Section II, Washington, D.C..Google Scholar
Veronis, G., (1973). Model of World Ocean circulation. Journal of Marine Research 31, 228.Google Scholar
Webb, T. III, Clark, D.R., (1974). On the use of tree rings, pollen, and marine plankton in reconstructing past climates. American Quaternary Association 3rd Annual Meeting Madison, Wisconsin126Abstracts.Google Scholar
Worthington, L.V., (1970). The Norwegian Sea as a mediterranean basin. Deep-Sea Research 17, 77–84.Google Scholar