Development of tree-ring chronologies for Hinoki cypress and Japanese cedar and high-precision climate reconstruction of the past climate

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The objectives of this study were (1) to develop the existing tree-ring chronologies for Hinoki cypress and Japanese cedar (Sugi) over the north-east and central regions of Japan, (2) to improve the quality of the chronologies by increasing a number of samples, e.g.modern, buried and archaeological wood (3) to reconstruct the past climate changes over the East Asian region using the new calibration techniques. As a result, we have developed the ca. 2000-year and 1200-year chronologies for Hinoki cypress and Japanese cedar, respectively. The general climatic responses of Hinoki and Sugi were derived from response function analysis, showing positive and negative correlations to mean temperatures in winter and spring (growth years) and summer (prior to the growth years), respectively. Based on the results, spring temperatures were reconstructed with significant results in statistical tests. In addition, a climate field (gridded temperatures) over the Korean Peninsula and west-to-northeastern Honshu island was successfully reconstructed using Japanese and Korean Chronologies.