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地球学报  2001 

碳酸酐酶对碳酸盐岩溶解的催化作用及其在大气CO2沉降中的意义

Keywords: 碳酸酐酶,CO2转换,碳酸盐岩溶解,化学风化,大气CO2沉降

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Abstract:

CO2向H^和HCO3^-的转换是一相对慢速过程。因此,其动力学可能决定碳酸盐岩的溶解速率。在灰岩和白云岩的溶解实验中,使用了自然界普遍存在的碳酸酐酶(CA)来催化这一CO2转换反应,结果发现,对灰岩而言,加入CA后,其溶解速率在高CO2分层时可增加10倍,而对白云岩,其溶解速率增加主要在低CO2分压时,可达3倍左右。这一发现表明,化学风化(包括碳酸盐岩溶解和硅酸盐风化)作用在大气CO2沉降和全球碳循环里的所谓丢失的汇中的重要性需要重新评价。毫无疑问,已往的研究由于未认识到CA在风化中的催化作用,因此低估了风化作用的速率,同时也低估了风化作用对大气CO2沉降的贡献。另一方面,也表明了研究自然界不同水体中CA分布及其活度和CA在自然界风化作用中的作用的必要性。

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