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Late-Quaternary Vegetation and Climate Near the Arctic Tree Line of Northwestern North America

Published online by Cambridge University Press:  20 January 2017

J.C. Ritchie  and
F.K. Hare
J.C. Ritchie
Affiliation:
Scarborough College, University of Toronto, West Hill, Canada
F.K. Hare
Affiliation:
Department of Geography, University of Toronto, Toronto, Canada
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Abstract

Earlier studies in Alaska and northwest Canada have shown inconsistent evidence for the expected northward extension of the Arctic tree line during the Hypsithermal Interval. Only megafossil evidence has supported this suggestion; the palynological findings have been inconclusive. The Tuktoyaktuk Peninsula, in the Northwest Territories of Canada, offers critical sites for studies of late-Pleistocene ecology, because of its geological, biotic, and climatological features. Palynological and megafossil evidence is presented from sites on the Tuktoyaktuk Peninsula, indicating northward advance of the Arctic tree line during the period 8500-5500 B.P. Relative pollen frequencies of a core of lake sediment suggest a late-Pleistocene sequence as follows: 12,900-11,600 dwarf birch tundra; 11600-8500 forest tundra; 8500-5500 closed-crown spruce-birch forest; 5500-4000 tall shrub tundra; 4000-present dwarf birch heath tundra. These results suggest that during the Hypsithermal Interval the Arctic Front (July position) was further north, over the Beaufort Sea, a displacement from its present position of about 350 km. The Tuktoyaktuk Peninsula, presently occupied by tundra, and dominated by the Arctic airstream in July, was apparently under forest, with warm, moist Pacific air during the Hypsithermal Interval.

Type
Original Articles
Information
Quaternary Research , Volume 1 , Issue 3 , September 1971 , pp. 331 - 342
Copyright
University of Washington

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References

Bryson, R.A. (1966). Air masses, streamlines and the Boreal Forest. Geographical Bulletin 8, 228–269.Google Scholar
Bryson, R.A., Wendland, W.M. (1967). Tentative climatic patterns for some Late-glacial and Post-glacial episodes in central North America. In “Life, Land and Water” (Mayer-Oakes, W.J. ed.), pp. 271–298.University of Manitoba Press, Winnipeg.Google Scholar
Bryson, R.A., Irving, W.N., Larsen, J.A. (1965). Radiocarbon and soil evidence of former forest in the southern Canadian tundra. Science 147, 46–48.CrossRefGoogle ScholarPubMed
Bryson, R.A., Wendland, W.M., Ives, J.D., Andrews, J.T. (1969). Radiocarbon isochrones on the disintegration of the Laurentide Ice Sheet. Arctic and Alpine Research 1, 1–13.CrossRefGoogle Scholar
Budyko, M.I. (1958). “The Heat Balance of the Earth's Surface,” U. S. Weather Bureau Washington. 259 pp. transl. from original: Teplovoi balans zemnoi poverkhnosti Leningrad 1956)Google Scholar
Canadian Department of Forests. (1963). “Forest Classification of Canada,” revised edition. Map.Google Scholar
Colinvaux, P.A. (1964). The environment of the Bering Land Bridge. Ecological Monographs 34, 297–329.CrossRefGoogle Scholar
Colinvaux, P.A. (1967a). Quaternary vegetation a history of arctic Alaska. In “The Bering Land Bridge”(Hopkins, D.M. ed.), pp. 207–231.Stanford University Press, Stanford, Calif.Google Scholar
Colinvaux, P.A. (1967). A long pollen record from St. Lawrence Island, Bering Sea (Alaska). Palaeogeography, Palaeoclimatology, Palaeoecology 3, 29–48.CrossRefGoogle Scholar
Detterman, R.L. (1970). Early Holocene warm interval in northern Alaska. Arctic 23, 130–132.CrossRefGoogle Scholar
Falconer, G., Ives, J.D., Løken, O.H., Andrews, J.T. (1965). Major end moraines in eastern and central Arctic Canada. Geographical Bulletin 2, 137–153.Google Scholar
Fyles, J.G. (1967). Mackenzie Delta and Arctic Coastal Plain. Geological Survey of Canada Paper 67-1, 34–35.Google Scholar
Geological Survey of Canada. (1968). “Glacial Map of Canada.” No. 1253A.Google Scholar
Hare, F.K. (1950). Climate and zonal divisions of the Boreal Forest formation in eastern Canada. Geographical Review 40, 615–635.CrossRefGoogle Scholar
Hare, F.K. (1959). “A Photo-Reconnaissance Survey of Labrador-Ungava.” Geographical Memoir 6, Department of Mines and Technical Surveys, Ottawa, 65 pp.Google Scholar
Hare, F.K., Hay, J.E. (1971). “Climate of Canada and Alaska,” in press. Elsevier, Amsterdam. (World Survey of Climatology series.)Google Scholar
Hare, H.K. (1968). The Arctic. Quarterly Journal of the Royal Meteorlogical Society 94, 439–459.CrossRefGoogle Scholar
Heusser, C.J. (1966). Palynology of the Ogotoruk Creek area. “Environment of the Cape Thompson Region, Alaska”(Wilimovksy, N.J. ed.), pp.355–362.U.S. Atomic Energy Commision, Washington, D.C.Google Scholar
Hopkins, D.M. (1959). Some characteristics of the climate in forest and tundra regions in Alaska. Arctic 12, 215–220.CrossRefGoogle Scholar
Hustich, I. (1966). On the forest-tundra and the northern tree-lines. Annals of the University of Turku A. II, 36. (Reports of the Kevo Subarctic Station3, 7–47).Google Scholar
Kind, N.V. (1967). Radiocarbon chronology in Siberia. “The Bering Land Bridge” (Hopkins, D.M. ed.), 172–192.Stanford University Press, Stanford, Calif.Google Scholar
Krebs, J.S., Barry, R.G. (1970). The Arctic Front and the tundra-taiga boundary in Eurasia. Geographical Review 60, 548–554.CrossRefGoogle Scholar
Lamb, H.H., Woodroffe, A. (1970). Atmospheric circulation during the last Ice Age. Quaternary Research 1, 29–58.CrossRefGoogle Scholar
Lamb, H.H., Lewis, R.P.W., Woodroffe, A. (1966). Atmospheric circulation and the main climatic variables. In “Proceedings of the International Symposium on World Climate 8,000-0 B.C.,” pp. 174–217. Royal Meteorlogical Society, London.Google Scholar
Lichti-Federovich, S., Ritchie, J.C. (1968). Recent pollen assemblages from the Western Interior of Canada. Palaeobotany and Palynology 7, 297–344.CrossRefGoogle Scholar
Livingstone, D.A. (1957). Pollen analysis of a valley fill near Umiat, Alaska. American Journal of Science 255, 254–260.CrossRefGoogle Scholar
Mackay, J.R. (1963). “The Mackenzie Delta Area, N.W.T.” Geographical Branch Memoir 8, 202Ottawa.Google Scholar
Mackay, J.R., Terasmae, J. (1963). Pollen diagrams in the Mackenzie Delta area, N.W.T. Arctic 16, 228–238.CrossRefGoogle Scholar
McCulloch, D., Hopkins, D.M. (1966). Evidence for an Early Recent warm interval in Northwestern Alaska. Geological Society of America Bulletin 77, 1089–1108.CrossRefGoogle Scholar
Müller, F. (1962). Analysis of some stratigraphic observations and radiocarbon dates from two pingos in the Mackenzie Delta area, N.W. 7. Arctic 15, 278–288.CrossRefGoogle Scholar
Namias, J. (1970). Climatic anomaly over the United States during the 1960's. Science 170, 741–743.CrossRefGoogle Scholar
Neushtadt, M.I. (1957). “History of the Forests and the Palaeogeography of the USSR in the Holocene.” Moscow, 402.Google Scholar
Nichols, H. (1967). Pollen diagrams from sub-Arctic central Canada. Science 155, 1665–1668.CrossRefGoogle ScholarPubMed
Nichols, H. (1967). The Post-glacial history of vegetation and climate at Ennadai Lake, Keewatin, and Lynn Lake, Manitoba (Canada). Eiszeitalter und Gegenwart 18, 176–197.Google Scholar
Porsild, A.E. (1938). Earth mounds in unglaciated arctic northwestern America. Geographical Review 28, 46–58.CrossRefGoogle Scholar
Terasmae, J. (1967). Recent pollen deposition in the Northeastern District of Mackenzie (Northwest Territories, Canada).Palaeogeography, Paleoclimatology, Paleoecology 3, 17–27.CrossRefGoogle Scholar
Terasmae, J., Craig, B.G. (1958). Discovery of fossil Ceratophyllum demersum L. in Northwest Territories, Canada. Canadian Journal of Botany 36, 567–569.CrossRefGoogle Scholar
Wright, H.E. Jr. (1968). A square-rod piston sampler for lake sediments. Journal of Sedimentary Petrology 37, 975–976.CrossRefGoogle Scholar