10:00 AM - 10:15 AM
[HQR04-04] Temperature change in western and northern Japan during the last 3,000 years and the related human activity
Keywords:temperature, Climate, Japanese society
We measured organic material of alkenone to reconstruct with high time resolution of temperature in marine and adjacent terrestrial environments, to evaluate the process behind long and short-term trend of temperature for the last 3000 years, and to understand the relationship between climatic changes and the human activity.
This time the results at Core St. 5 collected in Uchiura Bay showed that warm periods were 500 - 300AD, 100BC - 50AD, 670 - 900AD and 1900 - 2000AD and that cold periods were 1000 - 940BC, 800 - 700BC, around 200BC, 150 - 250AD, 560 - 620AD, 990 - 1150AD, 1750 - 1900AD. The combination of reconstructed temperature at northern and western Japan reconfirmed the concept that Cold periods appeared to coincide with major shifts in social systems in Japan.