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Arctic System Variability
The Arctic currently has one of the fastest changing climates on earth. At the same time, climate variability and change in the Arctic has global influences on ocean circulation and the pole-to-equator temperature gradient. This has led to our having a major focus on the Arctic and how it may change in the future. Some of our regional Arctic projects include paleoenvironmental work on Baffin Island, Greenland, and the Labrador Sea. The goal of this work is to unravel how the eastern Canadian Arctic, Greenland, and Labrador Sea regions vary on interannual to century time scales, and to determine the role of this variability in components of the climate system such as North Atlantic variability. An interesting anthropological facet of this work aims at understanding Norse interactions with the environment. We are also heavily involved in circum-Arctic studies, both in terms of understanding the full range of climate variability in this sensitive region and how it could affect global change outside the Arctic. We are working, for example, to understand the sensitivity of the whole Arctic and the Greenland Ice Sheet to human-induced climate change. Other collaborative work focuses on improving our understanding of how modes of Arctic climate variability changed over the last millennium. Jonathan Overpeck currently serves as Chair of the National Science Foundation (NSF) Arctic System Science (ARCSS) Committee. Atlantic
Variability
ARCSS
Data Coordination Center
O. Bennike, L. Cwynar, L. Doner, K. Hughen, M. Kerwin, G. Miller, B. Otto-Bleisner, P. Sauer, others in PARCS and CAPE workgroups
Huntington, H.P., M. Boyle, G. Flowers, J. Weatherly, L. Hamilton, C. Gerlach, R. Zulueta, C. Nicolson, and J. Overpeck. 2005. The influence of human activity in the Arctic on climate and climate impacts. Climatic Change (submitted).
Otto-Bliesner, B.L., J. Marshall, J.T. Overpeck, G.H. Miller, A. Hu, and CAPE Last Interglacial Project members. 2006. Simulating Arctic climate warmth and icefield retreat in the Last Interglaciation. Science 311: 1751-1753. Overpeck, J.T., B.L. Otto-Bliesner, G.H. Miller, D.R. Muhs, R.B. Alley, and J.T. Kiehl. 2006. Paleoclimatic evidence for future ice-sheet instability and rapid sea-level rise. Science 311: 1747-1750. Overpeck, J.T., M. Strum, J.A. Francis, D.K. Perovich, M.C. Serreze, and 16 others. 2005. Arctic system on trajectory to new, seasonally ice-free state. EOS 86: 309, 312-313. Fallu, M-A., R. Pienitz, I. Walker, and J. Overpeck. 2004. AMS 14-C dating of tundra lake sediments using chironomid head capsules. Journal of Paleolimnology 31: 11-22. Kerwin, M.W., J.T. Overpeck, R.S. Webb, and K.H. Anderson. 2004. Pollen-based summer temperature reconstructions for the eastern Canadian boreal forest, subarctic, and Arctic. Quaternary Science Reviews 23: 1901-1924. Moore, J.J., K.A Hughen, G.H. Miller, and J.T. Overpeck. 2001. Little Ice Age recorded in summer temperature reconstruction from varved sediments of Donard Lake, Baffin Island, Canada. Journal of Paleolimnology 25: 503-517. Sauer, P.E., G.H. Miller, and J.T. Overpeck. 2001. Oxygen isotope ratios of organic matter in arctic lakes as a paleoclimate proxy: field and laboratory investigations. Journal of Paleolimnology 25: 43-64. Hughen, K.A., J.T. Overpeck, and R.F. Anderson. 2000. Recent warming in a 500-year palaeotemperature record from varved sediments, Upper Soper Lake, Baffin Island, Canada. Holocene 10: 9-19. Kerwin, M., J.T. Overpeck, R.S. Webb, A. DeVernal, D.H. Rind, and R.J. Healy. 1999. The role of oceanic forcing in mid-Holocene Northern Hemisphere climatic change. Paleoceanography 14: 200-210. Overpeck, J.T. and 17 others. 1997. Arctic environmental change of the last four centuries. Science 278: 1251-1256. Hughen, K.A., J.T. Overpeck, R.F. Anderson, and K.M. Williams. 1996. The potential for palaeoclimatic records from varved Arctic lake sediments: Baffin Island, eastern Canadian Arctic. In: Paleoclimatology and Palaeoceanography from Laminated Sediments, A. Kemp, ed., Special Publications of the Geological Society of London, No. 116, pp. 57-71. |
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Studies Laboratory, Department of Geosciences, The University of Arizona Last updated
March 30, 2006
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