The solubility of fish‐produced high magnesium calcite in seawater
The solubility of fish‐produced high magnesium calcite in seawater
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DOI：
10.1029/2011jc007599
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发表时间：
2011-12
影响因子：
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通讯作者：
R. Woosley;F. Millero;M. Grosell
中科院分区：
文献类型：
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作者：
R. Woosley;F. Millero;M. Grosell
[1]鱼类已被证明产生高（10至48摩尔%）的镁方解石作为负责维持盐和水平衡的生理机制的一部分。这个来源对海洋碳循环的重要性现在才被考虑。在本文中，我们报告的第一个测量的溶解度，这碳酸钙在海水中。得到的溶解度（pK*sp = 5.89 ± 0.09）比文石高约两倍，并且与巴哈马浅滩上产生的高镁方解石（pK*sp = 5.90）相似。鱼产碳酸钙的这种高溶解度是高镁含量的结果，而不是微生物活动产生的微环境的产物。这种材料是可溶于近地表沃茨，有助于输入碳酸盐的表面海洋沃茨，并可能至少部分地解释所观察到的增加总碱度以上的文石饱和地平线。
[1] Fish have been shown to produce high (10 to 48 mol %) magnesium calcite as part of the physiological mechanisms responsible for maintaining salt and water balance. The importance of this source to the marine carbon cycle is only now being considered. In this paper, we report the first measurements of the solubility of this CaCO3 in seawater. The resulting solubility (pK*sp = 5.89 ± 0.09) is approximately two times higher than aragonite and similar to the high magnesium calcite generated on the Bahamas Banks (pK*sp = 5.90). This high solubility of fish-produced CaCO3 is a result of the high magnesium content and not a product of micro-environments created by microbial activity. This material is soluble in near surface waters, contributing to the input of carbonate to surface ocean waters, and may at least partially explain the observed increase in total alkalinity above the aragonite saturation horizon.