2:45 PM - 3:00 PM
[MIS23-11] Correlation between two tree-ring d18O chronologies from coastal areas of Pacific and Japan Sea in Hokkaido, North Japan
Keywords:tree-ring d18O, Hokkaido, Picea glehunii
We investigated the relationship between the tree-ring d18O and local meteorological parameters. We found that the tree-ring d18O in Teshio has positive correlation with spring temperature and negative correlation with summer precipitation and relative humidity, showing that it can become a good summer precipitation proxy because there is especially large negative correlation with summer precipitation. In contrast, we could not find any significant correlations between the tree-ring d18O in Onnebetsu facing on Pacific Ocean and summer meteorological factors. Because summer hydro-climate in Pacific Ocean side of North Japan is more complex than that in Japan Sea side reflecting the inter-annually varying effects of cold marine fog, we are obliged to conclude that it is difficult to reconstruct paleoclimate using the tree-ring d18O solely in Pacific Ocean side of Hokkaido. However, we found that there are predominant 20-years periodicity in the 11 years sliding correlation between the tree-ring d18O in Teshio and Onnebetsu, which is coincident well with the 11 year running mean of air temperature in Hokkaido. So, the tree-ring d18O in Pacific Ocean side of North Japan can be used as a novel temperature proxy by investigating its correlation with the tree-ring d18O in distant area rather than treating it solely.