Vol.5 No.2 2012

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Research paper : Paleoclimate reconstruction and future forecast based on coral skeletal climatology (A. Suzuki)−87−Synthesiology - English edition Vol.5 No.2 (2012) phenomenon.” Figure 12 is a table that summarizes the scheme of the research development of coral skeletal climatology. I hope Figs. 11 and 12 will allow the readers to overview the overall structure of the coral skeletal climatology on which we are currently working.4 Emphasis on the composite evaluation of various indicesComment (Koh Naito)When one reads your discussion, the understanding of the natural phenomenon is emphasized. To clarify the synthesiology as an integrated approach, I think you should emphasize the importance of accurately understanding the phenomenon by composite evaluation of various indices that you mentioned in the summarizing chapter.Answer (Atsushi Suzuki)As you mentioned, it is extremely important to evaluate the indices with advantages and disadvantages in a composite and integrated manner and to accurately reconstruct the past climates, in the paleoclimate reconstruction by geochemical method using coral skeletons. I emphasized this point in the introduction and the discussion.5 Breakthroughs by the introduction of new geochemical indexQuestion (Shigeko Togashi)The former Fig. 2 is a citation of AUSCORE, and I think it is a good graph that shows how breakthroughs occur by the introduction of new geochemical index. Can you add the contributions of the AIST research groups to this graph?Answer (Atsushi Suzuki)In the revision, former Fig. 2 became Fig. 3. I altered the histogram to show the papers of the AIST research groups.6 Scale of past temperature variations recorded in the fossil coralsComment (Shigeko Togashi)To clarify the breadth of the past time scale, please show the approximate temperature changes after the Pliocene, where the observation of the temperature variations recorded in the modern corals can be applied to fossil corals.Answer (Atsushi Suzuki)I added the reconstruction diagram of the temperature for the entire geological time scale after Pliocene to the newly added Fig. 2a, and attempted to show the overall trend in an easily understandable manner. This temperature reconstruction was done by estimating the temperature differences with the current temperatures in the South Pole region, based on the oxygen isotope ratio of the carbonate shell of the benthic foraminifers obtained from the core samples of deep seafloor deposits. Therefore, please note that the absolute value of the temperature differences may differ greatly according to latitudes and regions.

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