Climate in "Medieval Warm Period" and "Little Ice Age" of Japan, Europe and America

本文研究了“中世纪暖期（11 - 13世纪）”和“小冰期（16 - 19世纪）”两个典型气候期。研究了许多从欧洲和北美获得的结果。这项研究的目的之一是准确地阐明全球气候变化。通过对比全球气候重建结果和日本气候重建结果，明确了日本中世纪和近代的气候。本研究的结果如下：首先，继续制作日本历史气候数据库，输入“Tadotsu-han”日记本等新气象资料。并对欧洲历史气候数据库“EUROCLIM”进行了修改，使其更易于使用。利用这些数据库，可以对大范围内“中世纪暖期”和“小冰期”的气候变化进行分析。其次，利用上述数据库和相关研究成果，对日本和西方世界从古代到近代的气候变化进行了梳理。结果表明，“中世纪暖期”和“小冰期”是在全球范围内发生的。

Two typical climate periods, "Medieval Warm Period (from 11th to 13th Century)" and " Little Ice Age (from 16th to 19th Century)", are treated in this study. Many results which are obtained from Europe and North America, are examined. One of the purpose of this study is to clarify the global climate change precisely. The climate of medieval age and recent age of Japan are clarified by comparing the results of global climate reconstruction and that of Japan. The results of this study are as follows.Firstly, the historical climate database of Japan has been continued to make, and the new weather data from the diary of "Tadotsu-han" and so on are inputted. And on the "EUROCLIM" , historical climate data base of Europe, their personal computer system are modified to use it more easily. And using these databases, the climate change of "Medieval Warm Period" and "Little Ice Age" in wide area have been able to analyzed.Secondly, using above mentioned databases and the results of related studies, climate change of Japan and western world from ancient age to recent age are clarified. As the results, it has been cleared that "Medieval Warm Period" and "Little Ice Age" are occurred on global scale.