… The period between 9,000 and 4,000 years ago was a warm period. Of these, the period between 6,500 and 5,500 years ago was called the hypsithermal period, or climatic optimum, and was particularly warm. Temperatures were high worldwide, with an annual average temperature of 2 to 5 degrees Celsius, higher than present. … From [Ice Age]...The beginning of the postglacial period is based on the time when the Scandinavian ice sheet split into two near Lake Laguna in Sweden. During the postglacial period, there was a globally high temperature period called the climatic optimum about 6,000 years ago, when the average temperature was 2 to 5 degrees Celsius higher than today, and between this period was the postglacial high temperature period (hypsithermal) that lasted for 3,000 years. This period corresponds to a globally great marine transgression period known in Japan as the Jomon transgression. ... *Some of the terminology that mentions "climatic optimum" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 9000~4000年前は温暖な時期であった。このなかでも6500~5500年前をヒプシサーマルhypsithermalまたは気候最適期climatic optimumと呼び,特に温暖であった。全世界的に高温で,年平均気温は2~5℃で現在より高温であった。… 【氷期】より…後氷期はスカンジナビア氷床がスウェーデンのラグンダ湖付近で2分裂した時期などを,そのはじまりの基準にしている。後氷期には約6000年前に,現在よりも平均気温が2~5℃高いクライマティック・オプティマムclimatic optimum(気候最適期)といわれる世界的な高温期があり,それをはさんで前後3000年にわたる後氷期高温期(ヒプシサーマルhypsithermal)がある。この時期は,日本でも縄文海進として知られる世界的な大海進期にあたっている。… ※「climatic optimum」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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