Anthropogenic environment change and global climatic change after the little ice age recorded in the sediment of coastal lagoon.

南极地区在小冰期气候干燥。此后，该地区的气候转为相对湿润。北海道东部鄂霍次克海沿岸地处亚北极地带，除人为环境变化外，未观察到明显的古环境变化。在Tofutsu湖观察到湖口的关闭或缩小。这表明海平面略有下降。在位于温带的日本海沿岸，洪水沉积出现在小冰期末期(公元1600-1800)前后。在此基础上，对本区人类活动环境变化进行了识别。

Antarctic region shows dry climate during the little ice age. After that, climate changed to relative wet condition in this area. In the coastal area of the Sea of Okhotsk in the east part of Hokkaido located to for subarctic zone, distinguished paleoenvironmental changes are not observed except for anthropogenic environment change. The closure or reduction of lake mouth is observed in Lake Tofutsu. This is suggest the slightly fall of sea level. In the coastal area of the Japan Sea located to for temperate zone, the flood sediments are observed around the end of little ice age (AD1600-1800). After that, anthropogenic environment changes are distinguished in this area.