海洋の炭酸塩溶解に関する古海洋研究の現状と今後の課題
- 標題
- 海洋の炭酸塩溶解に関する古海洋研究の現状と今後の課題
- 作者
- 岩崎 晋弥
- 文件屬性
- 日本研究
- 知識分類
- 基礎研究
- 出版年
- 2014
- 刊名
- 地球化学
- 卷
- 48
- 期
- 4
- 頁
- p. 319-335
- 點閱數
- 2502
摘要
The Antarctic ice core records revealed atmospheric CO2 concentrations (pCO2) during glacial periods were ～80 ppm lower than those of interglacial periods. The mechanism of understanding the low atmospheric pCO2 of glacial periods is one of the most important problems in the global carbon cycle study. Most of paleoclimatologists consider that the deep-sea must have been an active pool of global carbon cycle on this timescale. However, there is no broadly accepted evidence that the deep sea played a role as the effective carbon pool during glacial periods. The reconstruction of deep-sea carbonate chemistry that is provided by oceanic CaCO3 cycle (CaCO3 preservation and dissolution) with glacial-interglacial cycles is a key to solve the mechanism of ocean carbon cycle. Number of previous studies reconstructed the pattern of CaCO3 dissolution on the seafloor during glacial-interglacial periods. These previous studies employed dissolution intensity proxies based on carbonate microfossils preserved in sediments. However, existing proxies are insufficient in order to obtain quantitative data for ocean carbon budget. This is due to the low accuracy of existing dissolution proxies and the lack of knowledge about carbonate dissolution mechanism. This review paper summarizes the principles, characteristics, application to paleoceanography and problems of carbonate dissolution proxies, and then discusses future possible development.