Climatic Reconstruction in Central Japan during the Little Ice Age based on Documentary Sources
Climatic Reconstruction in Central Japan during the Little Ice Age based on Documentary Sources
复制标题
基于文献资料的日本中部小冰期气候重建
DOI：
10.5026/jgeography.102.2_152
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发表时间：
1993
影响因子：
3.1
通讯作者：
Mitsuharu Mizukoshi
中科院分区：
文献类型：
--
作者：
Mitsuharu Mizukoshi
日本中部的“小冰河时代”始于世纪，结束于19世纪世纪中期。根据古老的文献记录，试图重建小冰期的气候条件。有许多旧文件记录了每日的天气状况。这些记录是按照日期顺序收集和排列的。通过这些作品，编制了日本中部历史时期的天气图。通过对这些图表的分析，重建了日本中部历史时期（从18世纪末到19世纪中期）的一些气候条件。主要结果如下。(1)19世纪10年代和19世纪20年代的冬季气温非常低。之后，天气逐渐转暖。(2)太平洋沿岸地区冬季降水量少。1830年以后，它发展到现在的水平。(3)冬季风流型出现的频率在19世纪10年代和19世纪20年代较高，在19世纪30年代较低。(4)在18世纪80年代、19世纪30年代和19世纪90年代，白鱼季节的结束被推迟了。在这些时期，凉爽的夏天经常出现在日本北方。(5)世纪中期，在白鱼季节里，频繁地发生了严重的水灾。相反，在世纪初期，白鱼季节的降雨量非常少。(6)19世纪初，夏季气候干燥少雨。19世纪中期气候湿润多雨，19世纪早期与中期气候条件存在差异。造成这些差异的主要原因可能是东亚地区大气环流形势的变化。通过对几个不同地区气候条件的比较，阐明了气候变化与大气环流形势的关系。
“The Little Ice Age” started in the 17th century and ended in the middleof the 19th century in Central Japan. The reconstruction of climatic conditions during the Little Ice Age was attempted, based on old documentary records. There are many old documents in which daily weather conditions were recorded. Those records were collected and arranged according to the order of dates. Through the works, weather diagrams were compiled for the historical times in Central Japan. By analyzing the diagrams, some climatic conditions during the historical times (from the end of the 18 th century to the middle of the 19 th century) were reconstructed for Central Japan. The main results are shown as follows.(1) Winter season temperatures were very low in the 1810's and the 1820's. After that it tended to become warmer gradually.(2) Precipitation amounts in winter on the Pacific coastal region is small. However after the 1830's, it increased to the present level.(3) Frequency of the appearance of the winter monsoonal flow pattern was higher in the 1810's and 1820's, and it became lower in the 1830's.(4) The end of the Bai-u season was delayed in the 1780's, 1830's and 1890's. In those periods, cool summers appeared in northern Japan frequently.(5) Heavy rainfalls frequently occurred during the Bai-u season in the middle of the 19th century. On the contrary, rainfall amounts during the Bai-u season were very small in the beginning of the 19th century.(6) In the beginning of the 19th cent ury, climatic condition of summer season was dry with little rain. Conversely, it is wet and much rain in the middle of the 19th century.There were some differences in climatic conditions between the early period and th e middle period of the 19th century. The main causes that bring these differences may have been the changes in general circulation patterns over East Asia. By comparing the climatic conditions in several different regions, the relationship between climatic changes andgeneral circulation patterns will be clarified.