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

本研究的目的是（1）发展日本东北部和中部地区现有的扁柏和日本雪松（杉）的树木年轮年表;（2）通过增加现代、埋藏和考古木材等样本数量来提高年表的质量;（3）使用新的校准技术重建东亚地区过去的气候变化。因此，我们开发了CA。2000-扁柏和日本雪松的1200年和1200年年表。扁柏和杉的一般气候响应来自响应函数分析，表现出积极和消极的相关性，在冬季和春季（生长年）和夏季（生长年之前），分别平均温度。在此基础上，重建了春季气温，统计检验结果显著。此外，还利用日本和韩国的年表成功地重建了朝鲜半岛和本州岛西北部的气候场（网格温度）。

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.