Continuous measurements of net production over a shallow reef community using a modified Eulerian approach
Continuous measurements of net production over a shallow reef community using a modified Eulerian approach
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DOI：
10.1029/2007jc004663
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发表时间：
2008-07-24
影响因子：
3.6
通讯作者：
Schar, Daniel W.
中科院分区：
文献类型：
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作者：
Falter, James L.;Lowe, Ryan J.;Schar, Daniel W.
我们连续测量了溶解氧通量的藻类为主的礁坪社区的卡内奥赫湾堡礁，夏威夷作为代理的净生产（NP）的有机碳。通量计算从测量的溶解氧和电流的配置文件，从停泊的氧传感器和声学多普勒电流剖面仪（ADCP）位于定义的顶点的三角形控制体积的每一边长250米。在整个控制体积中跟踪表面十字形漂流物以及染料斑块，以获得拉格朗日流的独立测量值。虽然染料斑速度与ADCP数据计算的深度平均流速高度相关（1：1）（r（2）= 0.86，n = 24），漂流物速度平均超过染料和计算的流速30-100%。当染料斑在整个研究中心传播时，在染料斑内取样的溶解氧测量值用于按照拉格朗日方法计算NP。NP的拉格朗日估计与NP的欧拉估计在1：1的基础上高度相关（r（2）= 0.81，n = 7）。群落生产和群落呼吸的比率每天从0.7到1.4不等，但在整个数据记录中整合时接近1.0的值。
We made continuous measurements of the flux of dissolved oxygen over an algal-dominated reef flat community on the Kaneohe Bay Barrier Reef, Hawaii as a proxy for the net production (NP) of organic carbon. Fluxes were calculated from measurements of dissolved oxygen and current profiles taken from moored oxygen sensors and acoustic Doppler current profilers (ADCPs) located at points defining the vertices of a triangular control volume 250 m in length on each side. Surface cruciform drifters as well as dye patches were tracked across the control volume to get independent measurements of Lagrangian currents. While the dye patch speeds were highly correlated with the depth-averaged current speeds calculated from ADCP data on a 1: 1 basis (r(2) = 0.86, n = 24), drifter speeds exceeded both dye and calculated current speeds by 30-100% on average. Measurements of dissolved oxygen sampled within the dye patches as it propagated across the study site were used to calculate NP following a Lagrangian approach. Lagrangian estimates of NP were highly correlated with Eulerian estimates of NP on a 1: 1 basis (r(2) = 0.81, n = 7). Ratios of community production and community respiration varied from 0.7 to 1.4 on a daily basis, but approached a value of 1.0 when integrated over the entire data record.