Interpretation of measured concentration profiles in sediment pore water
Interpretation of measured concentration profiles in sediment pore water
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DOI：
10.4319/lo.1998.43.7.1500
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发表时间：
1998-11-01
影响因子：
4.5
通讯作者：
Rysgaard, S
中科院分区：
文献类型：
--
作者：
Berg, P;Risgaard-Petersen, N;Rysgaard, S
发展了一套稳健的数值方法，用于沉积物孔隙水中溶质浓度剖面的生物地球化学解释和分析。假定浓度-深度剖面代表一个稳定状态，可以计算作为深度函数的净生产或消耗速率，以及穿过沉积物-水界面的通量。分析中可包括三种垂直运移：分子扩散、生物扰动和灌溉。该程序包括找到一系列与测量的浓度分布相匹配的最小二乘拟合度，然后通过统计F检验对这些拟合度进行比较。这种方法导致客观地选择再现浓度分布的最简单的生产-消费分布。由于数值过程相对于速度进行了优化，因此在个人计算机上通常可以在几分钟或更短的时间内完成一次预测。这项技术已经成功地与描述沉积物孔隙水中O-2的传输和消耗的分析解进行了测试。在其他测试中，测量的O-2、NO3-、NH4+和Sigma CO2的浓度分布已使用新程序进行了解释。
A robust numerical procedure for biogeochemical interpretation and analysis of measured concentration profiles of solutes in sediment pore water has been developed. Assuming that the concentration-depth profile represents a steady state, the rate of net production or consumption as a function of depth can be calculated, together with the flux across the sediment-water interface. Three kinds of vertical transport can be included in the analysis: molecular diffusion, bioturbation, and irrigation. The procedure involves finding a series of least square fits to the measured concentration profile, followed by comparisons of these fits through statistical F-testing. This approach leads to an objective selection of the simplest production-consumption profile that reproduces the concentration profile. Because the numerical procedure is optimized with respect to speed, one prediction can typically be done in a few minutes or less on a personal computer. The technique has been tested successfully against analytical solutions describing the transport and consumption of O-2 in sediment pore water. In other tests, measured concentration profiles of O-2, NO3-, NH4+, and Sigma CO2 have been interpreted using the new procedure.