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Acid volatile sulphide estimation using spatial sediment covariates in the Eastern Upper Gulf of Thailand: Multiple geostatistical approaches

机译:使用泰国东部上海湾的空间沉积物协变量估算酸挥发性硫化物:多种地统计学方法

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Summary Acid volatile sulphide (AVS), one of the most reactive phases in sediments, is a crucial link in explaining a dynamic biogeochemical cycle in a marine ecosystem. Research gaps exist in describing the spatial variation of AVS and interconnections with sediment covariates in the Eastern Upper Gulf of Thailand. Measurements of AVS and auxiliary parameters followed the standard protocol. A comparison of ordinary kriging (OK), cokriging (CK), and regression kriging (RK) performance was evaluated based on the mean absolute error (MAE) and root mean square error (RMSE). The concentrations of AVS ranged from 0.003 to 0.349 mg g?1 sediment dry weight. Most parameters contained short range spatial dependency except for oxidation–reduction potential (ORP) and pH. The AVS tended to be both linearly and non-linearly related to ORP and readily oxidisable organic matter (ROM). The RK model, using inputs from the tree-based model, was the most robust of the three kriging methods. It is suggested that nonlinear interactions should be taken into account when predicting AVS concentration, and it is expected that this will further increase the model accuracy. This study helps establish a platform for ecological health and sediment quality guidelines.
机译:小结酸性挥发性硫化物(AVS)是沉积物中最活泼的相之一,是解释海洋生态系统中动态生物地球化学循环的关键环节。在描述泰国东部上海湾AVS的空间变化以及与沉积物协变量的相互联系方面存在研究空白。 AVS和辅助参数的测量遵循标准协议。根据平均绝对误差(MAE)和均方根误差(RMSE)评估了普通克里金(OK),协同克里金(CK)和回归克里金(RK)性能的比较。 AVS的浓度范围为0.003至0.349 mg g ?1 沉积物干重。除了氧化还原电位(ORP)和pH值外,大多数参数都包含短程空间依赖性。 AVS往往与ORP和易于氧化的有机物(ROM)呈线性和非线性关系。 RK模型使用基于树的模型的输入,是三种克里金法中最强大的方法。建议在预测AVS浓度时应考虑非线性相互作用,并且有望进一步提高模型准确性。这项研究有助于建立生态健康和沉积物质量指南的平台。

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