The Medieval Warm Period (MWP), Medieval Climate Optimum, or Medieval Climatic Anomaly was a time of warm climate in the North Atlantic region that may also have been related to other climate events around the world during that time, including in China and other countries, lasting from about AD 950 to 1250. It was followed by a cooler period in the North Atlantic termed the Little Ice Age. Some refer to the event as the Medieval Climatic Anomaly as this term emphasizes that effects other than temperature were important.
Despite substantial uncertainties, especially for the period prior to 1600 when data are scarce, the warmest period of the last 2,000 years prior to the 20th century very likely occurred between 950 and 1100, but temperatures were probably between 0.1 °C and 0.2 °C below the 1961 to 1990 mean and significantly below the level shown by instrumental data after 1980. Proxy records from different regions show peak warmth at different times during the Medieval Warm Period, indicating the heterogeneous nature of climate at the time. Temperatures in some regions appears to have matched or exceeded recent temperatures in these regions, while globally the Medieval Warm Period was cooler than recent global temperatures.
Initial research 
The Medieval Warm Period (MWP) is generally thought to have occurred from about AD 950–1250, during the European Middle Ages. In 1965 Hubert Lamb, one of the first paleoclimatologists, published research based on data from botany, historical document research and meteorology combined with records indicating prevailing temperature and rainfall in England around 1200 and around 1600. He proposed that "Evidence has been accumulating in many fields of investigation pointing to a notably warm climate in many parts of the world, that lasted a few centuries around A.D. 1000–1200, and was followed by a decline of temperature levels till between 1500 and 1700 the coldest phase since the last ice age occurred."
The warm period became known as the MWP, and the cold period was called the Little Ice Age (LIA). However, this view was questioned by other researchers; the IPCC First Assessment Report of 1990 discussed the "Medieval Warm Period around 1000 AD (which may not have been global) and the Little Ice Age which ended only in the middle to late nineteenth century." The IPCC Third Assessment Report from 2001 summarised research at that time, saying "…current evidence does not support globally synchronous periods of anomalous cold or warmth over this time frame, and the conventional terms of 'Little Ice Age' and 'Medieval Warm Period' appear to have limited utility in describing trends in hemispheric or global mean temperature changes in past centuries". Global temperature records taken from ice cores, tree rings, and lake deposits, have shown that, taken globally, the Earth may have been slightly cooler (by 0.03 degrees Celsius) during the 'Medieval Warm Period' than in the early and mid-20th century.
Palaeoclimatologists developing region-specific climate reconstructions of past centuries conventionally label their coldest interval as "LIA" and their warmest interval as the "MWP". Others follow the convention and when a significant climate event is found in the "LIA" or "MWP" time frames, associate their events to the period. Some "MWP" events are thus wet events or cold events rather than strictly warm events, particularly in central Antarctica where climate patterns opposite to the North Atlantic area have been noticed.
By world region 
Evidence exists across the world, often very sparsely, for changes in climatic conditions over time. Some of the "warm period" events documented below are actually "dry periods" or "wet periods."
A 2009 study by Michael Mann et al. examining spatial patterns of surface temperatures shown in multi-proxy reconstructions finds that the MWP shows "warmth that matches or exceeds that of the past decade in some regions, but which falls well below recent levels globally." Their reconstruction of MWP pattern is characterised by warmth over large part of North Atlantic, Southern Greenland, the Eurasian Arctic, and parts of North America which appears to substantially exceed that of the late 20th century (1961–1990) baseline and is comparable or exceeds that of the past one-to-two decades in some regions. Certain regions such as central Eurasia, northwestern North America, and (with less confidence) parts of South Atlantic, exhibit anomalous coolness.
North Atlantic 
A radiocarbon-dated box core in the Sargasso Sea shows that the sea surface temperature was approximately 1 °C (1.8 °F) cooler than today approximately 400 years ago (the Little Ice Age) and 1700 years ago, and approximately 1 °C warmer than today 1000 years ago (the Medieval Warm Period).
Using sediment samples from Puerto Rico, the Gulf Coast and the Atlantic Coast from Florida to New England, Mann et al. (2009) found consistent evidence of a peak in North Atlantic tropical cyclone activity during the Medieval Warm Period followed by a subsequent lull in activity.
Through retrieval and isotope analysis of marine cores and examination of mollusc growth patterns from Iceland, Patterson et al were able to reconstruct a mollusc growth record at a decadal resolution from the Roman Warm Period through the Medieval Warm Period and into the Little Ice Age. 
North America 
The 2009 Mann et al. study found warmth exceeding 1961–1990 levels in Southern Greenland and parts of North America during the Medieval climate anomaly (defined for this purpose as 950 to 1250) with warmth in some regions exceeding temperatures of the 1990–2010 period. Much of the Northern hemisphere showed significant cooling during the Little Ice Age (defined for the purpose as 1400 to 1700) but Labrador and isolated parts of the United States appeared to be approximately as warm as during the 1961–1990 period.
From around 1,000 AD Vikings formed settlements in two areas located near the southern tip of Greenland at a similar latitude to Iceland, the Eastern Settlement at the southern tip, and the Western Settlement to its north. A smaller group of farms between them has been identified by archaeologists as the "Middle Settlement". At that time they farmed cattle and pigs, with around a quarter of their diet from seafood, but after the climate became colder and stormier around 1250 smaller farms gradually changed to farming sheep and goats rather than cows. Around 1300 they abandoned pig farming, and from then on seal hunting provided over three quarters of their food. While there are no signs that this adversely affected their health, by mid century trade with Norway fell away and there was little demand for their exports of seal skins and walrus tusks. One of the last documents of their occupation dates from 1408, and over the remainder of that century the remaining Vikings left in what seems to have an orderly withdrawal, largely due to social factors such as increased availability of farms in Scandinavian countries.
Around 1000AD the climate was sufficiently warm for the north of Newfoundland to support a Viking colony and led to the descriptor "Vinland." An extensive settlement at L'Anse aux Meadows was found and originally excavated by Helge Ingstad.
In the Chesapeake Bay, researchers found large temperature excursions (changes from the mean temperature of that time) during the Medieval Warm Period (about 950–1250) and the Little Ice Age (about 1400–1700, with cold periods persisting into the early 20th century), possibly related to changes in the strength of North Atlantic thermohaline circulation. Sediments in Piermont Marsh of the lower Hudson Valley show a dry Medieval Warm period from AD 800–1300.
Prolonged droughts affected many parts of the western United States and especially eastern California and the west of Great Basin. Alaska experienced three time intervals of comparable warmth: AD 1–300, 850–1200, and post-1800. Knowledge of the North American Medieval Warm Period has been useful in dating occupancy periods of certain Native American habitation sites, especially in arid parts of the western U.S. Review of more recent archaeological research shows that as the search for signs of unusual cultural changes during the MWP has broadened, some of these early patterns (for example, violence and health problems) have been found to be more complicated and regionally varied than previously thought while others (for example, settlement disruption, deterioration of long distance trade, and population movements) have been further corroborated.
Other regions 
A sediment core from the eastern Bransfield Basin, Antarctic Peninsula, preserves climatic events in the Little Ice Age and Medieval Warm Period. The core shows a distinctly cold period about AD 1000–1100, illustrating that during the "warm" period there were, regionally, periods of both warmth and cold.
Corals in the tropical Pacific Ocean suggest that relatively cool, dry conditions may have persisted early in the millennium, consistent with a La Niña-like configuration of the El Niño-Southern Oscillation patterns. Although there is an extreme scarcity of data from Australia (for both the Medieval Warm Period and Little Ice Age) evidence from wave-built shingle terraces for a permanently full Lake Eyre during the 9th and 10th centuries is consistent with this La Niña-like configuration, though of itself inadequate to show how lake levels varied from year to year or what climatic conditions elsewhere in Australia were like.
Adhikari and Kumon (2001), whilst investigating sediments in Lake Nakatsuna in central Japan, finding a warm period from AD 900 to 1200 that corresponded to the Medieval Warm Period and three cool phases, of which two could be related to the Little Ice Age. Another research in northeastern Japan shows that there is one warm/humid interval from AD 750 to 1200, and two cold/dry intervals from AD 1 to 750 and 1200 to present. Ge et al. studied temperatures in China during the past 2000 years; they found high uncertainty prior to the 16th century but good consistency over the last 500 years, highlighted by the two cold periods 1620s–1710s and 1800s–1860s, and the warming during the 20th century. They also found that the warming during the 10–14th centuries in some regions might be comparable in magnitude to the warming of the last few decades of the 20th century which was unprecedented within the past 500 years.
A 1979 study from the University of Waikato found that "Temperatures derived from an 18O/16O profile through a stalagmite found in a New Zealand cave (40.67°S, 172.43°E) suggested the Medieval Warm Period to have occurred between AD 1050 and 1400 and to have been 0.75 °C warmer than the Current Warm Period." The MWP has also been evidenced in New Zealand by an 1100-year tree-ring record.
A reconstruction based on ice cores found the Medieval Warm Period could be distinguished in tropical South America from about 1050 to 1300, followed in the 15th century by the Little Ice Age. Peak temperatures did not rise as high as those from the late 20th century, which were unprecedented in the area during the study period going back around 1600 years.
See also 
- Description of the Medieval Warm Period and Little Ice Age in IPCC reports
- Historical climatology
- Holocene climatic optimum
- Hockey stick graph
- Li, H.; Ku, T. (2002). "Little Ice Age and Medieval Warm Periods in Eastern China as Read from the Speleothem Records". American Geophysical Union 71: 09. Bibcode:2002AGUFMPP71C..09L.
- Leavitt, Steven W. (1994). "Major wet interval in white mountains medieval warm period evidenced in? 13C of bristlecone pine tree rings". Climatic Change 26 (2–3): 299. doi:10.1007/BF01092420.
- Grove, Jean M.; Switsur, Roy (1994). "Glacial geological evidence for the medieval warm period". Climatic Change 26 (2–3): 143. doi:10.1007/BF01092411.
- Diaz, Henry F.; Hughes, M. (1994). The Medieval warm period. Boston: Kluwer Academic Publishers. p. 134. ISBN 0-7923-2842-6. "6.2 Evidence for a Medieval Warm Epoch"
- Keigwin, L. D. (1996). "The Little Ice Age and Medieval Warm Period in the Sargasso Sea". Science 274 (5292): 1503. doi:10.1126/science.274.5292.1503.
- Stahle, David W.; Cleaveland, Malcolm K. (1994). "Tree-ring reconstructed rainfall over the southeastern U.S.A. During the medieval warm period and little ice age". Climatic Change 26 (2–3): 199. doi:10.1007/BF01092414.
- Yamada, Kazuyoshi; Kamite, Masaki; Saito-Kato, Megumi; Okuno, Mitsuru; Shinozuka, Yoshitsugu; Yasuda, Yoshinori (2010). "Late Holocene monsoonal-climate change inferred from Lakes Ni-no-Megata and San-no-Megata, northeastern Japan". Quaternary International 220: 122. Bibcode:2010QuInt.220..122Y. doi:10.1016/j.quaint.2009.09.006.
- Mann, M. E.; Zhang, Z.; Rutherford, S.; Bradley, R. S.; Hughes, M. K.; Shindell, D.; Ammann, C.; Faluvegi, G. et al. (2009). "Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly". Science 326 (5957): 1256–60. doi:10.1126/science.1177303. PMID 19965474.
- Bradley, Raymond S. (2003). "Climate of the Last Millennium". Climate System Research Center.
- Ladurie, Emmanuel Le Roy (1971). Times of Feast, Times of Famine: a History of Climate Since the Year 1000. Farrar Straus & Giroux. ISBN 0-374-52122-0.[page needed]
- Solomon, Susan Snell; Intergovernmental Panel on Climate Change (2007). "6.6 The Last 2,000 Years". Climate change 2007: the physical science basis: contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge: Cambridge University Press for the Intergovernmental Panel on Climate Change. ISBN 0-521-70596-7. Box 6.4
- Lamb, H.H. (1965). "The early medieval warm epoch and its sequel". Palaeogeography, Palaeoclimatology, Palaeoecology 1: 13. doi:10.1016/0031-0182(65)90004-0.
- IPCC First Assessment Report Working Group 1 report, Executive Summary p. 199
- Folland, C.K.; Karl, T.R.; Christy, J.R.; Clarke, R.A.; Gruza, G.V.; Jouzel, J.; Mann, M.E.; Oerlemans, J. et al. (2001). "2.3.3 Was there a “Little Ice Age” and a “Medieval Warm Period”?"". In Houghton, P.J.; Ding, Y.; Griggs, D.J.; Noguer, M.; van der Linden; Dai; Maskell; Johnson. Working Group I: The Scientific Basis. Intergovernmental Panel on Climate Change Climate Change 2001. Cambridge, United Kingdom and New York, NY, USA: Cambridge University Press. p. 881. ISBN 0-521-80767-0. Unknown parameter
|editor1-given=ignored (help); Unknown parameter
|editor3-given=ignored (help); Unknown parameter
|editor4-given=ignored (help); More than one of
- Bradley, R. S.; Hughes, MK; Diaz, HF (2003). "CLIMATE CHANGE: Climate in Medieval Time". Science 302 (5644): 404–5. doi:10.1126/science.1090372. PMID 14563996.
- Crowley, Thomas J.; Lowery, Thomas S. (2000). "How Warm Was the Medieval Warm Period?". AMBIO: A Journal of the Human Environment 29: 51. doi:10.1579/0044-7447-29.1.51.
- Jones, P. D.; Mann, M. E. (2004). "Climate over past millennia". Reviews of Geophysics 42 (2): 2002. Bibcode:2004RvGeo..42.2002J. doi:10.1029/2003RG000143.
- Mann, Michael E. (May 2010). "What we can learn from studying the last millennium (or so)". RealClimate.
- Mann, Michael E.; Woodruff, Jonathan D.; Donnelly, Jeffrey P.; Zhang, Zhihua (2009). "Atlantic hurricanes and climate over the past 1,500 years". Nature 460 (7257): 880–3. Bibcode:2009Natur.460..880M. doi:10.1038/nature08219. PMID 19675650.
- Patterson, W. P.; Dietrich, K. A.; Holmden, C.; Andrews, J. T. (2010). "Two millennia of North Atlantic seasonality and implications for Norse colonies". Proceedings of the National Academy of Sciences 107 (12): 5306–10. Bibcode:2010PNAS..107.5306P. doi:10.1073/pnas.0902522107. PMC 2851789. PMID 20212157.
- Diamond, Jared (2005). Collapse: How Societies Choose to Fail or Succeed. New York: Penguin Books. ISBN 0-14-303655-6.[page needed]
- Stockinger, Günther (10 January 2012). "Archaeologists Uncover Clues to Why Vikings Abandoned Greenland". Der Spiegel Online. Retrieved 12 January 2013.
- Stine Ingstad, Anne (2001). "The Excavation of a Norse Settlement at L'Anse aux Meadows, Newfoundland". In Helge Ingstad and Anne Stine Ingstad. The Viking Discovery of America. New York: Checkmark. pp. 141–169. ISBN 0-8160-4716-2. OCLC 46683692.
- "Medieval Warm Period, Little Ice Age and 20th Century Temperature Variability from Chesapeake Bay". USGS. Retrieved 2006-05-04.
- "Marshes Tell Story Of Medieval Drought, Little Ice Age, And European Settlers Near New York City". Earth Observatory News. May 19, 2005. Retrieved 2006-05-04.
- Stine, Scott (1994). "Extreme and persistent drought in California and Patagonia during mediaeval time". Nature 369 (6481): 546. doi:10.1038/369546a0.
- Hu, F. S. (2001). "Pronounced climatic variations in Alaska during the last two millennia". Proceedings of the National Academy of Sciences 98 (19): 10552. Bibcode:2001PNAS...9810552H. doi:10.1073/pnas.181333798.
- Dean, Jeffrey S. (1994). "The medieval warm period on the southern Colorado Plateau". Climatic Change 26 (2–3): 225. doi:10.1007/BF01092416.
- C. Michael Hogan (2008) Los Osos Back Bay, Megalithic Portal, editor A. Burnham.
- Jones, Terry L.; Schwitalla, Al (2008). "Archaeological perspectives on the effects of medieval drought in prehistoric California". Quaternary International 188: 41. Bibcode:2008QuInt.188...41J. doi:10.1016/j.quaint.2007.07.007.
- "Drought In West Linked To Warmer Temperatures". Earth Observatory News. 2004-10-07. Retrieved 2006-05-04.
- Khim, B.; Yoon, Ho Il; Kang, Cheon Yun; Bahk, Jang Jun (2002). "Unstable Climate Oscillations during the Late Holocene in the Eastern Bransfield Basin, Antarctic Peninsula". Quaternary Research 58 (3): 234. Bibcode:2002QuRes..58..234K. doi:10.1006/qres.2002.2371.
- Cobb, Kim M.; Chris Charles, Hai Cheng, R. Lawrence Edwards (July 8, 2003). "The Medieval Cool Period And The Little Warm Age In The Central Tropical Pacific? Fossil Coral Climate Records Of The Last Millennium". The Climate of the Holocene (ICCI) 2003. Archived from the original on August 25, 2004. Retrieved 2006-05-04.
- Allen, Robert J. (1985). The Australasian Summer Monsoon, Teleconnections, and Flooding in the Lake Eyre Basin. Royal Geographical Society of Australasia, S.A. Branch. ISBN 0-909112-09-6.[page needed]
- Fletcher, M-S.; Moreno, P.I. (16 July 2012). "Vegetation, climate and fire regime changes in the Andean region of southern Chile (38°S) covaried with centennial-scale climate anomalies in the tropical Pacific over the last 1500 years". Quaternary Science Reviews 46: 46–56. doi:10.1016/j.quascirev.2012.04.016.
- Adhikari, D. P.; Kumon, F. (2001). "Climatic changes during the past 1300 years as deduced from the sediments of Lake Nakatsuna, central Japan". Limnology 2 (3): 157. doi:10.1007/s10201-001-8031-7.
- Ge, Q.-S.; Zheng, J.-Y.; Hao, Z.-X.; Shao, X.-M.; Wang, Wei-Chyung; Luterbacher, Juerg (2010). "Temperature variation through 2000 years in China: An uncertainty analysis of reconstruction and regional difference". Geophysical Research Letters 37 (3): 03703. Bibcode:2010GeoRL..3703703G. doi:10.1029/2009GL041281.
- Wilson, A. T.; Hendy, C. H.; Reynolds, C. P. (1979). "Short-term climate change and New Zealand temperatures during the last millennium". Nature 279 (5711): 315. doi:10.1038/279315a0.
- Cook, Edward R.; Palmer, Jonathan G.; d'Arrigo, Rosanne D. (2002). "Evidence for a 'Medieval Warm Period' in a 1,100 year tree-ring reconstruction of past austral summer temperatures in New Zealand". Geophysical Research Letters 29 (14): 12. Bibcode:2002GeoRL..29n..12C. doi:10.1029/2001GL014580.
- Kellerhals, T.; Brütsch, S.; Sigl, M.; Knüsel, S.; Gäggeler, H. W.; Schwikowski, M. (2010). "Ammonium concentration in ice cores: A new proxy for regional temperature reconstruction?". Journal of Geophysical Research 115. Bibcode:2010JGRD..11516123K. doi:10.1029/2009JD012603.
Further reading 
- Hughes, Malcolm K.; Diaz, Henry F. (1994). "Was there a 'medieval warm period', and if so, where and when?". Climatic Change 26 (2–3): 109–42. doi:10.1007/BF01092410.
- Fagan, Brian (2000). The Little Ice Age: How Climate Made History, 1300–1850. Basic Books. ISBN 0-465-02272-3.
- Fagan, Brian (2009). The Great Warming: Climate Change and the Rise and Fall of Civilizations. Bloomsbury Publishing.
- Lamb, Hubert (1995). Climate, History, and the Modern World: Second Edition. Routledge.
- Vinther, B.M.; Jones, P.D.; Briffa, K.R.; Clausen, H.B.; Andersen, K.K.; Dahl-Jensen, D.; Johnsen, S.J. (2010). "Climatic signals in multiple highly resolved stable isotope records from Greenland". Quaternary Science Reviews 29 (3–4): 522–38. Bibcode:2010QSRv...29..522V. doi:10.1016/j.quascirev.2009.11.002.
- Staff members at NOAA Paleoclimatology (19 May 2000). The "Medieval Warm Period". A Paleo Perspective...on Global Warming. NOAA Paleoclimatology.
|Wikimedia Commons has media related to: Medieval Warm Period|
- HistoricalClimatology.com, further links and resources, updated 2013
- Climate History Network, network of historical climatologists, updated 2013
- The Little Ice Age and Medieval Warm Period at American Geophysical Union