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科学通报  2011 

南海珊瑚礁夏季是大气CO2的源

, PP. 414-422

Keywords: 珊瑚礁,pCO2,碳循环,夏季,南海

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Abstract:

分别于2008和2009年夏季对南海南沙群岛永暑礁(环礁)、西沙群岛永兴岛(岛礁)和海南三亚鹿回头岸礁进行了海-气CO2交换的连续观测.结果表明(1)南海珊瑚礁区表层海水和大气pCO2存在明显的日周期变化,白天下降,晚上上升;(2)不同礁区大气pCO2日变幅小,而表层海水pCO2日变幅较大,永暑礁潟湖为~70μmolmol-1,鹿回头及永兴岛礁坪分别为264~579μmolmol-1和420~619μmolmol-1,鹿回头礁外为324~492μmolmol-1;(3)不同礁区海-气CO2交换通量也有较大差异,永暑礁潟湖为0.4mmolCO2m-2d-1,永兴岛礁坪为4.7mmolCO2m-2d-1,鹿回头湾为9.8mmolCO2m-2d-1,表明南海珊瑚礁在夏季是大气CO2的源.在水深较浅的礁坪,生物代谢是海水pCO2变化的主要驱动因素,而较深的潟湖或礁外,水动力条件和生物代谢共同作用影响海水pCO2的变化.相对于大洋区,无机碳代谢对珊瑚礁区海水pCO2的变化有更显著的影响.

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