Quantitative pollen-based climate reconstruction in central Japan: application to surface and Late Quaternary spectra

DOI Web Site Web Site 被引用文献53件

説明

Abstract Climate reconstruction in Japan by the best modern analogues method was tested with 285 surface pollen spectra, and then applied to the 47,000 years pollen profile from Lake Mikata, Central Japan. Both pollen taxa percentages and plant functional type affinity scores were used in the reconstruction of six climate variables. The reconstructed values were compared with the estimated modern climate at each surface pollen site in order to evaluate the accuracy of the pollen-based reconstruction. The reconstruction of thermal parameters is very reliable (correlation coefficient R between 0.86 and 0.89). The reconstruction of annual precipitation is less accurate (R=0.7). We also proposed a new technique to calibrate reconstructed values into both probability distribution and/or confidence regions of observed values. The specialized programs for this calibration (PolCalib and PolHist) are available at QSR website ( http://www.elsevier.nl/locate/quascirev ). The reconstruction of the Late Quaternary climate changes around Lake Mikata shows that the summer and winter temperatures were 5°C lower than present around 40 uncal. kyr BP, reached a minimum around 20 uncal. kyr BP (10°C lower than present), and became similar to present-day at 8 uncal. kyr BP. The estimates for annual precipitation show that it was driest around 20 uncal. kyr BP.

収録刊行物

被引用文献 (53)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ