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Medieval Warm Period
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The term "Medieval Warm Period" has been used to describe a past climate epoch in Europe and neighbouring regions during the 11th-14th centuries. However, it has been demonstrated that this warm period varies geographically in a considerable way and that the evidence does not support a synchronous period of anomalous warmth during the Middle Ages. Western Greenland exhibited unusual warmth locally around 1000, and to lesser extent, around 1400, with quite cold conditions during the latter part of the 11th century, while Scandinavian summer temperatures appear to have been relatively warm only during the 11th and early 12th centuries. In Western and Central Europe the 13th century was the Medieval Warmth Period proper. On the European continent the warmth period was over sometime in the first half of the 14th century. In England and Iceland it outlasted the 14th century.
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The Medieval Warm Period (MWP) was a period of higher temperatures, that was recorded particularly in northern Europe, during the mid-9th to mid-13th Centuries AD. It presents a difficulty for the AGW lobby, which tries (a) to dimiss it as a local anomaly (see You Can't Have it Both Ways) and (b) claim that the temperatures then were cooler than now. It was during the MWP that vinyards flourished in Britain (Lamb, H.H., 1966, The Changing Climate, Methuen, London.) and during which the Vikings settled Greenland. It was a period when Europe flourished economically and during which the great gothic cathedrals were built.
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During the Medieval Warm Period (800 to 1200 A.D.), the Vikings colonized Greenland. In his Perspective, Broecker discusses whether this warm period was global or regional in extent. He argues that it is the last in a long series of climate fluctuations in the North Atlantic, that it was likely global, and that the present warming should be attributed in part to such an oscillation, upon which the warming due to greenhouse gases is superimposed.
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With the Medieval Warm Period and Little Ice Age clearly evident in Taiwan and China, the appearance of the same events in Japan would provide useful validation. Ironically, most of the proxy and historical evidence comes from none other than Kyoto itself, the ancient capital of Japan. According to a study by Tagami [26]
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If the Medieval Warm Period and Little Ice Age, and the cycles before them, did not actually take place, then the recent warming may indeed be unprecedented. But their non-existence is by no means settled, as the Soon study makes clear. determine if the proxy records themselves indeed confirm the claim of the 1990s being the warmest decade of the last millennium. That claim is not borne out by the individual proxy records.”
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A common argument for the existence of a global Medieval Warm Period is that the solar radiation hitting Earth's atmosphere, or solar irradiance, was as high in medieval time as in the 20th century. Therefore, the argument goes, 20th century global warming has been largely driven by the sun, not by higher concentrations of heat-trapping greenhouse gases in the atmosphere.
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Medieval Warm Period