Climatic Change

, Volume 26, Issue 2–3, pp 143–169 | Cite as

Glacial geological evidence for the medieval warm period

  • Jean M. Grove
  • Roy Switsur


It is hypothesised that the Medieval Warm Period was preceded and followed by periods of moraine deposition associated with glacier expansion. Improvements in the methodology of radiocarbon calibration make it possible to convert radiocarbon ages to calendar dates with greater precision than was previously possible. Dating of organic material closely associated with moraines in many montane regions has reached the point where it is possible to survey available information concerning the timing of the medieval warm period. The results suggest that it was a global event occurring between about 900 and 1250 A.D., possibly interrupted by a minor readvance of ice between about 1050 and 1150 A.D.


Organic Material Warm Period Global Event Great Precision Geological Evidence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Aeschlimann, H.: 1983,Zur Geschichte des Italienischen Mont Blanc Gebietes: Val Veni-Val Ferret-Ruitor, Unpublished Dissertation, Geographischen Institut der Universität Zürich.Google Scholar
  2. Aitchison, T. al.: 1989, ‘A Comparison of Methods Used for the Calibration of Radiocarbon Ages’,Radiocarbon 31, 846–64.Google Scholar
  3. Benedict, J. B.: 1976, ‘Khumbu Glacier Series’,Radiocarbon 18, 177–8.Google Scholar
  4. Bless, R.: 1984, ‘Beitrage zur Spät- und Postglazialen Geschichte der Gletscher im Nordöstlichen Mont Blanc Gebiet’,Phys. Geogr. 15, 1–116.Google Scholar
  5. Bradley, R. S. and Jones, P. D.: 1992a, ‘When Was the “Little Ice Age” ’, in Mikami, T. (Ed.),Proceedings of the International Symposium on the Little Ice Age Climate, Tokyo Metropolitan University.Google Scholar
  6. Bradley, R. S. and Jones, P. D.: 1992b,Climate since A.D. 1500, Routledge, London and New York.Google Scholar
  7. Bradley, R. S. and Jones, P. D.: 1993, ‘“Little Ice Age” Summer Temperature Variations: Their Nature and Relevance to Recent Global Warming Trends’,The Holocene 3, 367–76.Google Scholar
  8. Burrows, C. J.: 1973, ‘Studies of Some Glacial Moraines in New Zealand - 2. Ages of Moraines of the Mueller, Hooke and Tasman Glaciers (S79)’,New Zeal. Geol. Geophys. 16, 831–55.Google Scholar
  9. Burrows, C. J.: 1979, ‘A Chronology for Cool-Climate Episodes in the Southern Hemisphere 12000-1000 yr. BP’,Palaeogeogr. Palaeoclimatol. Palaeoecol. 27, 287–347.Google Scholar
  10. Burrows, C. J.: 1980, ‘Radiocarbon Dates for Post-Otiran Glacial Activity in the Mt. Cook Region, New Zealand’,New Zeal. J. Geol. Geophys. 23, 239–48.Google Scholar
  11. Burrows, C. J. and Greenland, D. E.: 1979, ‘An Analysis of the Evidence for Climatic Change in New Zealand in the Last Thousand Years: Evidence from Diverse Natural Phenomena and from Instrumental Records’,J. Roy. Soc. New Zeal. 9, 321–73.Google Scholar
  12. Calkin, P. E.: 1988, ‘Holocene Glaciation of Alaska (and Adjoining Yukon Territory, Canada)’,Quatern. Sci. Rev. 7, 159–84.Google Scholar
  13. Calkin, P. E. and Ellis, J. M.: 1981, ‘A Cirque Glacier Chronology Based on Emergent Lichens and Mosses’,J. Glaciol. 27, 512–5.Google Scholar
  14. Clapperton, C. M. and Sugden, D. E.: 1988, ‘Holocene Glacier Fluctuations in South America and Antarctica’,Quatern. Sci. Rev. 7, 185–98.Google Scholar
  15. Egan, C. P.: 1971,Contribution to the Late Neoglacial History of the Lynn Canal and Taku Valley Sections of the Alaska Boundary Range, PhD Dissertation, State University, East Lancing, Michigan.Google Scholar
  16. Fushini, H.; 1977, ‘Glaciation in the Khumbu Himal’,Seppyo, J. Jap. Soc. Snow Ice 39, 60–7.Google Scholar
  17. Fushini, H.: 1978, ‘Glaciation in the Khumbu Himal’,Seppyo, J. Jap. Soc. Snow Ice 40, 71–7.Google Scholar
  18. Gellatly, A. F., Chinn, T. J. H., and Röthlisberger, F.: 1988, ‘Holocene Glacier Variations in New Zealand: A Review’,Quatern. Sci. Rev. 7, 227–42.Google Scholar
  19. Griffey, N. J. and Matthews, J. A.: 1978, ‘Major Neoglacial Expansion Episodes in Southern Norway: Evidence from Moraine Stratigraphy with C14 Dates on Buried Paleosols and Moss Layers’,Geograf. Annal. 60(A), 73–96.Google Scholar
  20. Grove, J. M.: 1985, ‘The Timing of the Little Ice Age in Scandinavia’, in Tooley, M. J. and Sheail, G. M. (eds.),The Climatic Scene, Allen and Unwin, London.Google Scholar
  21. Grove, J. M.: 1988,The Little Ice Age, Methuen, London and New York.Google Scholar
  22. Grove, J. M. and Orombelli, G.: ‘The Southern Region of Europe; the Alps, Italy and the Pyrenees’, in Boulton, G. S. and Mason, P. (eds.),Evaluation of Climate Proxy Data in Relation to the European Holocene, Special issue: ESF Project European Climate and Man.Paläoklimaforsch. Palaoclim. Res., in press.Google Scholar
  23. Gouze, P.,et al.: 1986, ‘Interpretation Paleoclimatique des Oscillations des Glaciers au Cours des 20 Derniers Millenaires dans les Regions Tropicales: Example des Andes Boliviennes’,Compte Rend. L'Acad. Sci. Paris 303 (II), 219–23.Google Scholar
  24. Heuser, C. J.: 1956, ‘Postglacial Environments in the Canadian Rocky Mountains’,Ecol. Monogr. 26, 253–302.Google Scholar
  25. Holzhauser, P.: 1984a, ‘Zur Geschichte der Aletschgletscher und des Fieschergletscher’,Phys. Geogr. 13, 1–448.Google Scholar
  26. Holzhauser, P.: 1988, ‘Methoden zur Rekonstruktion von Gletscherschwankungen’,Die Alpen 64, 135–65.Google Scholar
  27. Holzhauser, P.: 1984b, ‘Rekonstruktion von Gletscherschwankungen mit Hilfe Fossiler Holzer’,Geograph. Helv. 39, 3–15.Google Scholar
  28. Karlén, W.: 1988, ‘Scandinavian Glacial and Climatic Fluctuations during the Holocene’,Quatern. Sci. Rev. 7, 100–209.Google Scholar
  29. Lamb, H. H.: 1965, ‘The Early Medieval Warm Period and Its Sequel’,Paleogeogr., Paleoclimatol., Paleoecol. 1, 13–37.Google Scholar
  30. Luckman, B. H. and Osborn, G. D.: 1979, ‘Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains’,Quatern. Res. 25, 10–24.Google Scholar
  31. Luckmann, B. H.: 1986, ‘Reconstruction of Little Ice Age Events in the Canadian Rocky Mountains’,Geograph. Phys. Quatern. XL, 17–28.Google Scholar
  32. Luckman, B. H.: 1993, ‘Neoglacial Glacier Fluctuations in the Canadian Rockies’,Quatern. Res. 39, 144–53.Google Scholar
  33. Lütschg, O.: 1926, ‘Über Niederschlag und Abfluss im Hochgebirge, Sonderdarstellung des Mattmarkgebietes’,Schweizerischer Wasserwirtschaftverband, Verbandschrift C14, Veröffentlichung der Schweizerischen Meteorologischen Zentralanstalt in Zürich, Zürich Sekretariat des Schweizerischen Wasserwirtschaftstverbandes.Google Scholar
  34. Kinzl, H.: 1932, ‘Die Grössten Nacheiszeitlichen Gletschervorstösse in den Schweizer Alpen und in der Mont-Blanc-Gruppe’,Zeitschr. Gletscherk. 20, 269–397.Google Scholar
  35. Mann, D. H.: 1986, ‘Reliability of a Fjord Glacier's Fluctuations for Paleoclimatic Reconstruction’,Quatern. Res. 25, 10–24.Google Scholar
  36. Matthews, J. A.: 1984, ‘Limitations of C14 Dates from Buried Soils in Reconstructing Glacier Variations and Holocene Climate’, in Morner, N. A. and Karlén, W. (eds.),Climatic Changes on a Yearly to Millennial Basis: Geological, Historical and Instrumental Records, 281-90.Google Scholar
  37. Matthews, J. A.: 1985, ‘14C Dating of Paleosols, Pollen Analysis and Landscape Change: Studies from Low- and Mid-Alpine Belts of Southern Norway’, in Boerdman, J. (ed.),Soils and Quaternary Landscape Evolution, John Wiley London, pp. 87–116.Google Scholar
  38. Mayr, F.: 1964, ‘Untersuchungen über Ausmass und Folgen der Klima- und Gletscherswankungen seit dem Beginn der postglazialen Wärmezeit’,Zeitschr. Geomorphol. 8, 257–85.Google Scholar
  39. Mercer, J. H.: 1965, ‘Glacier Variations in Southern Patagonia’,Geograph. Rev. 55, 390–413.Google Scholar
  40. Mercer, J. H.: 1968, ‘Variations of Some Patagonian Glaciers since the Late Glacial I’,Amer. J. Sci. 266, 1–25.Google Scholar
  41. Mercer, J. H.: 1970, ‘Variations of Some Patagonian Glaciers since the Late Glacial II’,Amer. J. Sci 269, 91–109.Google Scholar
  42. Mercer, J. H.: 1976, ‘Glacial History of Southernmost South America’,Quatern. Res. 6, 125–66.Google Scholar
  43. Mercer, J. H. and Palacios, O.: 1977, ‘Radiocarbon Dating of the Last Glaciation in Peru’,Geol. 5, 600–4.Google Scholar
  44. Miller, G. H.: 1973, ‘Late Quaternary Glacial and Climatic History of Northern Cumberland Peninsula, East Baffin Island, NWT, Canada’,Quatern. Res. 3, 561–83.Google Scholar
  45. Nesje, A.: 1991, ‘Holocene Glacial and Climatic History of the Jostedalen Region, Western Norway' Evidence from Lake Sediments and Terrestial Deposits’,Quatern Sci. Rev. 10, 87–114.Google Scholar
  46. Nesje, A. and Dahl, S. D.: 1991, ‘Holocene Variations of Blaisen, Hardangerjoklen, Central South Norway’,Quatern. Res. 35, 25–40.Google Scholar
  47. Nesje, A. and Rye, N.: 1993, ‘Late Holocene Glacial Activity at Sandskard Fonna, Jostedalsbreen Area, Western Norway’,Norsk Geogr. Tidsskr. 47, 21–8.Google Scholar
  48. Nesje, al.: 1991, ‘Holocene Glacial and Climatic History of the Jostedalsbreen Region, Western Norway; Evidence from Lake Sediments and Terrestial Deposits’,Quatern. Sci. Rev. 10, 87–114.Google Scholar
  49. Oeschger, H. and Röthlisberger, H.: 1961, ‘Datierung Eines Ehemaligen Standes des Aletschgletschers durch Radioaktivitätsmessung an Holsproben und Bemerkungen zu Holsfunden an Weiteren Gletschern’,Zeitschr. Gletscherk. Glazialgeol. 4, 191–205.Google Scholar
  50. Orombelli, G. and Porter, S. C.: 1982, ‘Late Holocene Fluctuations of Brenva Glacier’,Geogr. Fis. Dinam. Quatern. 5, 14–37.Google Scholar
  51. Osborn, G.: 1986, ‘Lateral Moraine Stratigraphy and Neoglacial History of Bugaboo Glacier, British Columbia’,Quatern. Res. 26, 171–8.Google Scholar
  52. Osborn, G. and Luckman, B. H.: 1988, ‘Holocene Glacier Fluctuations in the Canadian Cordillera (Alberta and British Columbia)’,Quatern. Sci. Rev. 7, 115–28.Google Scholar
  53. Porter, S. C.: 1981, ‘Lichenometric Studies in the Cascade Range of Washington: Establishment ofRhizocarpon Geographicum Growth Curves on Mt. Rainier’,Arc. Alp. Res. 13, 11–23.Google Scholar
  54. Porter, S. C. and Orombelli, G.: 1986, ‘Glacier Contraction during the Middle Holocene in the Western Italian Alps: Evidence and Implications’,Geol. 13, 296–8.Google Scholar
  55. Rabot, C.: 1902, ‘Essai de Chronologie des Variations Glaciaires’,Bull. Geogr. Histor. Descript. 285-327.Google Scholar
  56. Röthlisberger, F.: 1986,10000 Jahre Gletschergeschichte der Erde, Mit einem Beitrag von M. A. Geyh, Sauerländer, Aarau und Frankfurt am Main.Google Scholar
  57. Röthlisberger, F. and Schneebeli, W.: 1979, ‘Genesis of Lateral Moraine Complexes, Demonstrated by Fossil Soils and Trunks: Indicators of Postglacial Climatic Fluctuations’, in Schluchter, E. (ed.),Moraines and Varves, Balkema, Rotterdam, pp. 387–419.Google Scholar
  58. Röthlisberger, F.,et al.: 1980, ‘Holocene climatic Fluctuations. Radiocarbon Dating of Fossil Soils (fAh) and Wood from Moraines and Glaciers in the Alps’,Geogr. Helv. 35, 21–52.Google Scholar
  59. Röthlisberger, F. and Geyh, M. A.: 1985a, ‘Glacier Variations in the Himalayas and Karakorum’,Zeitschr. Gletscher, Glazialgeol. 21, 237–49.Google Scholar
  60. Röthlisberger, F. and Geyh, M. A.: 1985b, ‘Gletscherschwankungen der Nacheiszeit in der Cordillera Blanca (Peru) und den Südlichen Anden Chiles und Argentiniens’,Zentralbl. Geol. Paleoontol. 11, 1611–3.Google Scholar
  61. Ryder, J. M. and Thomson, B.: 1986, ‘Neoglaciation in the Southern Coast Mountains of British Columbia: Chronology of Events Prior to the Late Neoglacial Maximum’,Canad. J. Earth Sci. 23, 273–87.Google Scholar
  62. Sacco, F.: 1917, ‘I Ghiacciai Italiani del Gruppo Monte Bianco’,Boll. Comit. Glaciol. Ital. Ser. 2.3, 21–102.Google Scholar
  63. Seltzer, G. O.: 1990, ‘Recent Glacial History and Paleoclimate of the Peruvian-Bolivian Andes’,Quatern. Sci. Rev. 9, 137–52.Google Scholar
  64. Stuiver, M. and Pearson, G. W.: 1986, ‘High Precision Calibration of the Radiocarbon Timescale A. D. 1950-500 B. C.’,Radiocarbon 28, 805–38.Google Scholar
  65. Stuiver, M. and Pearson, G. W.: 1993, ‘High-Precision Bidecadal Calibration of the Radiocarbon Timescale A. D. 1950-500 B. C.’,Radiocarbon 35, 1–23.Google Scholar
  66. Suess, H. E.: 1970, ‘Bristlecone Pine Calibration of the Radiocarbon Timescale 5200 B. C. to Present’, in Olson, I. U. (ed.),Radiocarbon Variations and Absolute Chronology, Interscience, New York.Google Scholar
  67. Tuthill, S. J., Field, W. O., and Clayton, L.: 1966, ‘Past Earthquake Studies of the Sherman and Sheridan Glaciers’, inThe Great Alaskan Earthquakes of 1964 (Hydrology Volume), National Academy of Sciences, Washington, D. C. Publication 163, pp. 318–28.Google Scholar
  68. Villalba, R.: 1990, ‘Climatic Fluctuations in Northern Patagonia during the Last Thousand Years as Inferred from Tree Rings’,Quatern Res. 34, 346–60.Google Scholar
  69. Wardle, P.: 1973, ‘Variations of Glaciers in Westland National Park and the Hooker Range’,New Zeal. J. Botany 11, 349–88.Google Scholar
  70. Wheeler, J. O.: 1964, ‘Selkirk and Monash Mountains: Recent Glacier Fluctuations’,Canad. Geophys. Bull. 17, 1267.Google Scholar
  71. Williams, V. S.: 1983, ‘Present and Former Equilibrium Line Altitudes near Mt. Everest, Nepal and Tibet’,Arc. Alp. Res. 15, 201–11.Google Scholar
  72. Willis, E. H., Munnich, K. O., and Tauber, H.: 1960, ‘The Variations in Atmospheric Radiocarbon Activity over the Past 1800 Years’,Amer. J. Sci. Radiocarb. Suppl. 2, 1–4.Google Scholar
  73. Worsley, P. and Alexander, M.: 1975, ‘Neoglacial Paleoenvironmental Change at Engabreen, Svartisen, Holandsfiord, North Norway’,Norges Geol. Underokelse 321, 37–66.Google Scholar
  74. Wright, H. E.: 1984, ‘Late Glacial and Late Holocene Moraines in the Cerros Cuchpanga, Central Peru’,Quatern. Res. 21, 275–85.Google Scholar
  75. Zumbühl, H. J. and Holzhauser, H.: 1990, ‘Alpengletscher in den Kleinen Eiszeit’,Geogr. Bern. 31, 3–36.Google Scholar

Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Jean M. Grove
    • 1
  • Roy Switsur
    • 2
  1. 1.Girton CollegeCambridgeU.K.
  2. 2.Wolfson CollegeCambridgeU.K.

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