完新世の記録に基づいて推定する将来の地球環境変動に対するサンゴ礁の応答

概要

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Coral reefs are related to all the factors of the predicted global changes for the next century : CO2 increase, global warming and sea-level rise. The analysis and modeling of postglacial reef responses to these changes with a time scale of 103 years provide ground truth information as to the possible responses of reefs to the future changes. The sea-level rise might bring about submergence of reefs. The threshold rate is 4 m/1, 000 years : if the sea-level rise over 40 cm occurs in the next century, reef surface will not keep up with the rising sea. Rise in sea surface temperature might cause bleaching of corals in the tropical region. On the other hand, the distribution area of reef corals was expanded at the hypsithermal time in the subtropical region such as Japan. Calcium carbonate deposition in coral reefs releases CO2 into the atmosphere. The postglacial CO2 increase did not match the time of reef calcium carbonate deposition. This might show the effect of photosynthetic CO2 fixation which occurs simultaneously in reefs. Postglacial records show that reef responses to global changes are not simple ones.
公益社団法人東京地学協会の論文
1994-12-01