The combined influence of hydrodynamic forcing and calcification on the spatial distribution of alkalinity in a coral reef system
The combined influence of hydrodynamic forcing and calcification on the spatial distribution of alkalinity in a coral reef system
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水动力强迫和钙化对珊瑚礁系统碱度空间分布的综合影响
DOI：
10.1029/2011jc007603
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发表时间：
2012
影响因子：
--
通讯作者：
G. Ivey
中科院分区：
文献类型：
--
作者：
Zhenlin Zhang;J. Falter;Ryan J. Lowe;G. Ivey
[1]我们通过现场测量和数值模拟相结合，研究了水动力（波浪、潮汐、沿岸流和风）和珊瑚礁生物的净钙化对边缘礁系统总碱度（TA）空间分布的影响。现场实验进行了10天以上的珊瑚湾（Ningaloo礁，西澳大利亚州），在此期间，我们测量波高，电流和潮汐以及TA的空间分布在前礁，礁顶，泻湖。我们使用所观察到的变化，TA在相邻的礁坪，沿着与天气测量跨礁运输，估计在原地率的净钙化（GCV）使用控制量的方法。在此基础上，利用三维海洋环流模式ROMS（Regional Ocean Modeling System）模拟了光驱动的底栖生物净钙化的日变化。通过将ROMS与光谱波模型（近岸模拟波）耦合，我们能够模拟珊瑚湾礁泻湖系统内的海流，这些海流与现场观测结果吻合良好，并证明该系统的环流是波浪主导的。现场测量和数值模型输出均证实，停留时间（τR）和TA主要随离岸波高和海湾内的位置而变化。然而，TA的变化也受到净钙化率之间的非线性相互作用的影响，净钙化率作为昼夜变化的光和水的停留时间的函数，作为离岸波高的函数而变化。
[1] We investigated the influence of hydrodynamic forcing (waves, tides, alongshore currents and winds) and net calcification by coral reef organisms on the spatial distribution of total alkalinity (TA) in a fringing reef system through a combination of field measurements and numerical modeling. A field experiment was conducted over 10 days in Coral Bay (Ningaloo Reef, Western Australia) during which we measured wave heights, currents, and tides as well as the spatial distribution of TA across the fore reef, reef crest, and lagoon. We used observed changes in TA on the adjacent reef flat, along with synoptic measurements of cross-reef transport, to estimate in situ rates of net calcification (gcv) using a control volume approach. Based on the gcv estimated, we simulated light-driven, diurnal variations in benthic net calcification within a three-dimensional ocean circulation model, ROMS (Regional Ocean Modeling System). By coupling ROMS with a spectral wave model (Simulating Waves Nearshore), we were able to simulate currents within Coral Bay reef-lagoon system that were in good agreement with the field observations and demonstrate that circulation with the system was wave-dominated. Both the field measurements and numerical model output confirmed that both residence time (τR) and TA varied primarily with offshore wave heights and location within the bay. However, variations in TA were also affected by the nonlinear interaction between rates of net calcification that varied as a function of diurnally changing light and water residence time that varied as a function of offshore wave heights.