Synchronous Td'-derived SSTs (.DEG.C.) off Japan with Climatic Events in the Northern Hemisphere

Abstract

Annual sea-surface temperatures （SSTs） （℃） were derived from a regression analysis between the ratio of warm-and cold-water diatoms （Td′ ratio） in 123 surface sediment samples around the Japanese Islands and measured mean annual SSTs （℃） at the core sites. The cross spectra between the atmospheric residual 14 C （‰） , and annual SSTs （℃） of cores DGC-6 （Japan Sea） and MD01-2421 （off Kashima） , respectively, consist of five dominant periods: 6000, 2400, 1600, 950, and 700 years.