[Illustrations, footnotes and references available in PDF version]
The Medieval Warm Period (MWP) was a global climatic anomaly that encompassed a few centuries on either side of AD 1000, when temperatures in many parts of the world were even warmer than they are currently. The degree of warmth and associated changes in precipitation, however, sometimes varied from region to region, with the result that the MWP was expressed somewhat differently now and then in different parts of the world. How it manifested itself in Japan is the subject of this Summary.
The Medieval Warm Period (MWP) was a global climatic anomaly that encompassed a few centuries on either side of AD 1000, when temperatures in many parts of the world were even warmer than they are currently.
Since the atmosphere's CO2 concentration was so much lower a millennium ago than it is today, there is no compelling reason to attribute the lesser warmth of the present to the air's higher CO2 content.
These diverse observations clearly reveal the existence of both the Medieval Warm Period and Little Ice Age in Japan, thereby strengthening the proposition that these distinctive climatic intervals were in fact global as opposed to merely regional phenomena that were restricted to countries bordering the North Atlantic Ocean (as climate alarmists still are inclined to claim).
This insightful new study is truly a stellar example of both ingenuity and tedious bibliographic sleuthing that testifies of the significant warmth of the Medieval Warm Period at a specific location, but which is said to be typical of what has been learned about the Asian continent in general by the studies of others. In addition, it suggests the importance of considering the presence or absence of urban heat island effects when comparing current and past reconstructed temperatures. And when considered in their totality, all these things come together to further strengthen the likelihood that the Medieval Warm Period was truly a global phenomenon, and that its peak warmth was greater than what has been experienced to date in our day.