High-resolution carbon budgets on a Palau back-reef modulated by interactions between hydrodynamics and reef metabolism
High-resolution carbon budgets on a Palau back-reef modulated by interactions between hydrodynamics and reef metabolism
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DOI：
10.4319/lo.2013.58.5.1851
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发表时间：
2013-09-01
影响因子：
4.5
通讯作者：
Koseff, J. R.
中科院分区：
文献类型：
--
作者：
Teneva, L.;Dunbar, R. B.;Koseff, J. R.
在西太平洋的帕劳共和国，珊瑚占主导地位的后礁社区的碳化学和水动力制度的昼夜趋势进行了测量。在5天内观察到的昼夜变化范围为pH 7.92-8.09，二氧化碳分压33.4-52.7 Pa，测得的总碱度2080-2272 μ mol kg（-1），总溶解无机碳1763-1939 μ mol kg（-1），文石饱和状态2.84-3.98，方解石饱和状态4.44-5.67。珊瑚礁新陈代谢和水动力机制的结合驱动了这种变化。我们报告的净群落钙化率（NCC）和净群落生产率（NCP）分别为-20.4（+/- 7.8）至41.2（+/- 37.7）mmol CaCO 3 m（-2）h（-1）和77.3（+/- 95）至64（+/- 22）mmol Cm（-2）h（-1）。使用控制体积的方法，我们表明，NCC和NCP率估计是相当敏感的有效控制体积尺寸。在该地点，跟踪控制体积内水团的垂直混合表明，活跃的水混合往往局限于珊瑚上方2-3米的区域。垂直的碳质量通量进出海底环境是出乎意料的大流速慢电流观察，这表明珊瑚形态或珊瑚礁粗糙度可能会影响质量运输的碳和营养物质。NCC和NCP值的范围突出了需要对各种珊瑚礁进行额外的实地工作，以调整和优化控制体积方法，以充分发挥其对珊瑚礁代谢监测的潜力。
Diel trends in carbon chemistry and hydrodynamic regimes were measured on a coral-dominated back-reef community in the Republic of Palau, western Pacific. Observed diel ranges over 5 d were pH 7.92-8.09, partial pressure of carbon dioxide 33.4-52.7 Pa, measured total alkalinity 2080-2272 mu mol kg(-1), total dissolved inorganic carbon 1763-1939 mu mol kg(-1), aragonite saturation state 2.84-3.98, and calcite saturation state 4.44-5.67. The combination of reef metabolism and hydrodynamic regimes drives this variability. We report net community calcification (NCC) and net community production (NCP) rates of -20.4 (+/- 7.8) to 41.2 (+/- 37.7) mmol CaCO3 m(-2) h(-1) and 77.3 (+/- 95) to 64 (+/- 22) mmol C m(-2) h(-1), respectively. Using a control volume approach, we show that NCC and NCP rate estimates are quite sensitive to the effective control volume dimensions. At this site, tracking vertical mixing of water masses within the control volume shows that active water mixing is often confined to a region 2-3 m above the corals. Vertical carbon mass fluxes into and out of the benthic environment were unexpectedly large for the slow current flow rates observed, suggesting that coral morphology or reef rugosity may affect mass transport of carbon and nutrients. The ranges of NCC and NCP values highlight the need for additional field work on various reefs to tune and optimize the control volume approach to achieve its full potential for reef metabolism monitoring.