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

这项研究的目的是(1)建立日本东北部和中部地区现有的日本柏木和日本雪松(Sugi)的年轮年表；(2)通过增加一些样品，例如现代的、埋藏的和考古的木材来提高年表的质量；(3)利用新的校准技术重建东亚地区过去的气候变化。因此，我们开发了日本柏木和日本雪松的约2000年和1200年的年表。由响应函数分析得到Hinoki和Sugi的总体气候响应，它们分别与冬春季(生长年份)和夏季(生长年份之前)的平均气温呈正相关和负相关。在此基础上，重建了春季温度，并在统计检验中取得了显著的结果。此外，利用日本和韩国的年表，成功地重建了朝鲜半岛和本州岛从西到东北的气候场(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.