Paleoclimate reconstruction in the western North Pacific region for past 1 ka using peat cellulose δ13C and δ18O from Hokkaido, Japan

Peat sediment is one of the most important terrestrial archives for recording paleoclimatological histories. Especially, stable isotope ratio of peat cellulose is used as a proxy indicator for paleoclimate such as temperature and precipitation. In this study, to reconstruct past climate change in the western North Pacific region, we present δ¹³C and δ¹⁸O values of peat cellulose of a ca. 70 cm down core retrieved from peat bog, Nakaminenotaira, Hokkaido, Northernmost islands of Japan, as well as their high resolution radiocarbon age model using intact plant (Sphagnum), peat bulk cellulose and bulk organic matter. Firstly, to determine the meteorological limiting factors of stable carbon and oxygen isotope values of peat cellulose, we compared stable isotope values in surface sediment with meteorological observation data. Furthermore, we reconstruct the variability of temperature and precipitation for last 1 ka from the δ¹³C and δ¹⁸O records, and discuss about the variability of East Asian monsoon and the linkage of global climate change such as Little Ice Age and Medieval Warm Period.