Analysis of the seawater CO2 system in the barrier reef‐lagoon system of Palau using total alkalinity‐dissolved inorganic carbon diagrams
Analysis of the seawater CO2 system in the barrier reef‐lagoon system of Palau using total alkalinity‐dissolved inorganic carbon diagrams
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DOI：
10.4319/lo.2006.51.4.1614
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发表时间：
2006-07
影响因子：
4.5
通讯作者：
A. Watanabe;H. Kayanne;Hiroshi Hata;S. Kudo;K. Nozaki;Ken Kato;A. Negishi;Y. Ikeda;H. Yamano
中科院分区：
文献类型：
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作者：
A. Watanabe;H. Kayanne;Hiroshi Hata;S. Kudo;K. Nozaki;Ken Kato;A. Negishi;Y. Ikeda;H. Yamano
通过测定总碱度(TA)和总溶解无机碳(DIC)，研究了帕劳珊瑚礁海水二氧化碳(CO2)系统。考虑到海水的不同停留时间，用TA-DIC图分析了礁坪和泻湖CO2系统的变化。近岸海域CO2在空间和时间上相对稳定，而在礁坪，由于白天的光合作用和钙化作用以及夜间的呼吸和钙化作用，CO2发生了快速(约3h)和实质性的变化。水流入泻湖，在较长的停留时间(~30d)内发生有机物分解和持续钙化。尽管存在空间和时间上的变化，但泻湖中心的TA和DIC值相对恒定，与整个泻湖的平均值相似。在过去十年中，珊瑚礁生产力和钙化的长期下降了30%-40%，这主要是由于1998年发生重大珊瑚礁白化事件后珊瑚礁环境退化的结果。这反映在泻湖近岸水域和泻湖中心水域的TA和DIC的差异减小。
We studied the seawater carbon dioxide (CO2) system in the Palau coral reef by measuring total alkalinity (TA) and total dissolved inorganic carbon (DIC). Variation in the CO2 system on the reef flat and in the lagoon was analyzed by TA‐DIC diagrams, taking into accounts the differing residence times of seawater. CO2 in the offshore water was relatively stable in space and time, but on the reef flat it was subject to rapid (about 3 h) and substantial changes due to photosynthesis and calcification during the day and due to respiration and calcification at night. Water flowed into the lagoon where decomposition of organic matter and continuing calcification occurred over relatively long residence times (~30 d). Despite the spatial and temporal variations, the center of the lagoon had relatively constant TA and DIC values similar to the mean values for the entire lagoon. A long‐term 30–40% decrease in reef productivity and calcification has occurred over the last decade, primarily a result of degradation of the reef environment following a major coral reef bleaching event in 1998. This is reflected in decreases in the differences in TA and DIC between offshore lagoon waters and those in center of the lagoon.