钙循环

钙循环是指钙在溶解相和固体相之间的转移。岩石、生物和土壤會不断地向水体中释放钙离子。 ^[1] ^[2]钙离子在水环境中被消耗，因为它们会与水体反应生成不溶性產物，例如碳酸鈣和硅酸钙。 ^[1]^[3]这些不溶性產物會沉积形成沉积物或生物体的外骨骼。 ^[4]钙循环是陆地、海洋、地质和生物之间的共同纽带。 ^[5]钙在地球上循环的过程中穿梭于这些不同的介质中。海洋酸化导致地球大氣中的二氧化碳浓度变化，进而影响海洋钙循环。 ^[4]

參考文獻

^ ^1.0 ^1.1 Walker, James C. G.; Hays, P. B.; Kasting, J. F. A negative feedback mechanism for the long-term stabilization of Earth's surface temperature. Journal of Geophysical Research. 1981, 86 (C10): 9776. Bibcode:1981JGR....86.9776W. ISSN 0148-0227. doi:10.1029/jc086ic10p09776.
^ Berner, R. A. A model for calcium, magnesium and sulfate in seawater over Phanerozoic time. American Journal of Science. 2004-05-01, 304 (5): 438–453. Bibcode:2004AmJS..304..438B. ISSN 0002-9599. doi:10.2475/ajs.304.5.438 .
^ Ridgwell, Andy; Zeebe, Richard E. The role of the global carbonate cycle in the regulation and evolution of the Earth system. Earth and Planetary Science Letters. 2005-06-15, 234 (3–4): 299–315. ISSN 0012-821X. doi:10.1016/j.epsl.2005.03.006.
^ ^4.0 ^4.1 Raisman, Scott; Murphy, Daniel T. Ocean acidification: Elements and Considerations. Hauppauge, New York: Nova Science Publishers, Inc. 2013. ISBN 9781629482958.
^ Fantle, Matthew S.; Tipper, Edward T. Calcium isotopes in the global biogeochemical Ca cycle: Implications for development of a Ca isotope proxy. Earth-Science Reviews. 2014, 131: 148–177. ISSN 0012-8252. doi:10.1016/j.earscirev.2014.02.002.

[:12-1] 1.0 ^1.1 Walker, James C. G.; Hays, P. B.; Kasting, J. F. A negative feedback mechanism for the long-term stabilization of Earth's surface temperature. Journal of Geophysical Research. 1981, 86 (C10): 9776. Bibcode:1981JGR....86.9776W. ISSN 0148-0227. doi:10.1029/jc086ic10p09776.

[:23-2] Berner, R. A. A model for calcium, magnesium and sulfate in seawater over Phanerozoic time. American Journal of Science. 2004-05-01, 304 (5): 438–453. Bibcode:2004AmJS..304..438B. ISSN 0002-9599. doi:10.2475/ajs.304.5.438 .

[:8-3] Ridgwell, Andy; Zeebe, Richard E. The role of the global carbonate cycle in the regulation and evolution of the Earth system. Earth and Planetary Science Letters. 2005-06-15, 234 (3–4): 299–315. ISSN 0012-821X. doi:10.1016/j.epsl.2005.03.006.

[:4-4] 4.0 ^4.1 Raisman, Scott; Murphy, Daniel T. Ocean acidification: Elements and Considerations. Hauppauge, New York: Nova Science Publishers, Inc. 2013. ISBN 9781629482958.

[:62-5] Fantle, Matthew S.; Tipper, Edward T. Calcium isotopes in the global biogeochemical Ca cycle: Implications for development of a Ca isotope proxy. Earth-Science Reviews. 2014, 131: 148–177. ISSN 0012-8252. doi:10.1016/j.earscirev.2014.02.002.

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