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Atlantic Variability
Seasonal- to millennial-scale variability in the North Atlantic exerts strong influences on climate over much of the globe, particularly in regions adjacent to and down-wind from the North Atlantic. Some of this variability is tightly tied to changes in the high latitude North Atlantic and global thermohaline circulation, while other variability relates more to changes in the tropical North Atlantic. Activities in the laboratory focus on both of these areas and how they influence climate both inside and outside of the circum-Atlantic region. We have a long-term effort underway to reconstruct and examine interannual and century-scale variability in the Labrador Sea in order to determine how this variability affects regional climate in the Canadian Arctic, Greenland, and North Atlantic. We also have current studies in both the eastern and western tropical Atlantic that are revealing a great deal about the nature of Atlantic variability on decadal to millennial time scales and its relationship to drought in North America and northern Africa. With the publishing of a Nature paper in 1989 and subsequent paleoceanographic cruise, we, along with Larry “Bubba” Peterson at the University of Miami, began what has become a successful, more than a decade long investigation of the Cariaco Basin. Dozens of papers from laboratories around the world have resulted in making the Cariaco Basin one of the best known paleoenvironmental sites in the world.
Abrupt
Climate Change
D. Black, J. Cole, M. Evans, K. Hughen, S. Lehman, L. Peterson, J. Southon, T. Shanahan
Shanahan, T.M., J.T. Overpeck, K.J. Anchukaitis, J.W. Beck, J.E. Cole, D.L. Dettman, J.A. Peck, C.A. Scholz, and J.W. King. 2009. Atlantic forcing of persistent drought in West Africa. Science 324: 377-380. Koeberl, C., B. Milkereit, J.T. Overpeck, C.A. Scholz, P.Y.O. Amoako, D. Boamah, S. Danuor, T. Karp, J. Kueck, R.E. Hecky, J.W. King, and J.A. Peck. 2007. An international and multidisciplinary drilling project into a young complex impact structure: The 2004 ICDP Bosumtwi Crater Drilling Project - An overview. Meteoritics & Planetary Science 42: 483-511. Hughen, K.A., J.R. Southon, S.J. Lehman, and J.T. Overpeck. 2000. Synchronous radiocarbon and climate shifts during the last deglaciation. Science 290: 1951-1954. Black, D.E., L.C. Peterson, J.T. Overpeck, A. Kaplan, M. Evans, and M. Kashgarian. 1999. Eight centuries of North Atlantic Ocean variability. Science 286: 1709-1713. Hughen, K.A., J. Southon, L.C. Peterson, R. Alley, D.M. Sigman, J.T. Overpeck, S.J. Lehman, and M. Kashgarian. 1998. Deglacial changes in ocean circulation from an extended radiocarbon calibration. Nature 391: 65-68. Lin, H-l., L.C. Peterson, J.T. Overpeck, S. Trumbore, and D.W. Murray. 1997. Late Quaternary climate change from delta O-18 records of multiple species of planktonic foraminifera: High-resolution records from the anoxic Cariaco Basin, Venezuela. Paleoceanography 12: 415-427. Hughen, K.A., J.T. Overpeck, L.C. Peterson, and R.F. Anderson. 1996. The nature of varved sedimentation in the Cariaco Basin, Venezuela, and its palaeoclimatic significance. In: Palaeoclimatology and Palaeoceanography from Laminated Sediments, A. Kemp, ed., Special Publications of the Geological Society of London, No. 116, pp. 171-183. Hughen, K.A., J.T. Overpeck, L.C. Peterson, and S. Trumbore. 1996. Rapid climate changes in the tropical Atlantic region during the last deglaciation. Nature 380: 51-54. Peterson, L.C., J.T. Overpeck, N. Kipp, and J. Imbrie. 1991. A high-resolution late-Quaternary upwelling record from the anoxic Cariaco Basin, Venezuela. Paleoceanography 6: 99-119. Overpeck, J.T., L.C. Peterson, N. Kipp, J. Imbrie, and D. Rind. 1989. Climate change in the circum-North Atlantic region during the last deglaciation. Nature 338: 553-557. |
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Studies Laboratory, Department of Geosciences, The University of Arizona Last updated
September 14, 2009
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