Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR027306 |
Modeling hydrologic controls on particulate organic carbon contributions to beach aquifer biogeochemical reactivity | |
Kyra H. Kim; James W. Heiss; Xiaolong Geng; Holly A. Michael | |
2020-09-09 | |
发表期刊 | Water Resources Research |
出版年 | 2020 |
英文摘要 | The intertidal zone of beach aquifers hosts biogeochemical transformations of terrestrially‐derived nutrients that are mediated by reactive organic carbon from seawater infiltration. While dissolved organic carbon is often assumed the sole reactive organic carbon component, advected and entrapped particulate organic carbon (POC) is also capable of supporting chemical reactions. Retarded advection of POC relative to groundwater flow forms pools of reactive carbon within beach sediments that support biogeochemical reactions as dissolved solutes move across them due to transient groundwater flow. In this work, we simulate the contribution of POC to beach reactions and identify parameters that control its relative contribution using a groundwater flow model (SEAWAT) and reactive transport model (PHT3D). Results show transient contributions of POC to denitrification, as the spatial extent of the saline circulation cell varies over time due to changing hydrologic factors. A decrease in POC retardation and an increase in tidal amplitude during POC deposition resulted in POC expansion, which increased the relative contributions of POC to beach reactivity. Decreased hydraulic conductivity and increased tidal amplitude post‐deposition decreased the utilization of POC for denitrification by allowing the oxic, saline water to completely encompass the pool of POC. Results highlight that POC is an intermittently‐utilized source of carbon that displays complex spatial relationships with groundwater flow conditions and overall beach biogeochemistry. This work demonstrates that POC may be a periodically important, but overlooked contributor to biogeochemical reactions in carbon‐poor beach aquifers. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/293990 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Kyra H. Kim,James W. Heiss,Xiaolong Geng,et al. Modeling hydrologic controls on particulate organic carbon contributions to beach aquifer biogeochemical reactivity[J]. Water Resources Research,2020. |
APA | Kyra H. Kim,James W. Heiss,Xiaolong Geng,&Holly A. Michael.(2020).Modeling hydrologic controls on particulate organic carbon contributions to beach aquifer biogeochemical reactivity.Water Resources Research. |
MLA | Kyra H. Kim,et al."Modeling hydrologic controls on particulate organic carbon contributions to beach aquifer biogeochemical reactivity".Water Resources Research (2020). |
条目包含的文件 | 条目无相关文件。 |
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