摘要：Only about 100 years or less of ob-servational data for the ocean environment in the subtropical north-western Pacific exist. Geochemical tracers, such as stable oxygen isotopes (¦Ä18O), strontium/calcium (Sr/Ca) and uranium/calcium (U/Ca) ratios in skel-etons of massive corals are excellent paleoclimatic and paleoceanographic proxies to extend our knowledge of the ocean environment beyond the instrumental record. Recently, a coral record going back to 1873 AD from Chichijima in the Ogasawara Islands (Felis et al. 2009) and a 165-year long record from Ishigaki Island, southern Ryukyus (Mishima et al. 2010) have become available (Fig. 1). These coral records reveal several coupled ocean-atmosphere phenomena during the early 20thcentury in the northwestern subtropical Pacific
