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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Assessing source contributions to particulate organic matter in a subtropical estuary: A biomarker approach
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Assessing source contributions to particulate organic matter in a subtropical estuary: A biomarker approach

机译:评估亚热带河口对颗粒有机物的源贡献:一种生物标记方法

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摘要

Assessing the sources and quantifying the contributions of particulate organic matter (POM) in estuaries is a challenge. Here we apply source-specific biomarkers to assess POM sources in an estuary receiving suspended material from freshwater wetlands, fringe mangroves and coastal environments. A three end-member mixing model, including terrestrial, estuarine and marine end-member contributions was developed and successfully validated to assess general OM dynamics and hydrologic processes that control POM distributions within the Shark River estuary in South Florida. Low tide and wet season conditions coincided with an enhanced signal of the freshwater end-member biomarker abundance, while high tide and dry season conditions resulted in enhanced POM input of marine origin. Incoming tide was observed to be an important factor in the re-suspension and tidal pumping of mangrove-derived POM, which seems to be the dominant source of particulate organic carbon (POC) in the estuary. The three end-member conceptual model was tested to obtain a rough estimate of POC source strength, with the ultimate goal of constraining carbon budgets in this sub-tropical estuary. Mangrove-derived POC flux of ca. 5.3 × 10~5 to 1.0 × 10~6 kg/yr POC from the Shark River to the Gulf of Mexico were estimated, but end-member values used in the assessment need to be better constrained to reduce the degree of variability.
机译:评估河口的来源并量化河口中颗粒有机物(POM)的贡献是一项挑战。在这里,我们应用特定于源的生物标记物来评估河口中的POM来源,该河口接收来自淡水湿地,边缘红树林和沿海环境的悬浮物质。建立了包括地面,河口和海洋末端成员在内的三个末端成员混合模型,并成功验证了该模型,以评估控制南佛罗里达鲨鱼河口中POM分布的一般OM动态和水文过程。低潮和湿季条件与淡水末端成员生物标志物丰度信号增强同时发生,而高潮和旱季条件导致海洋来源的POM输入增加。观察到潮汐是红树林派生的POM重新悬浮和抽潮的重要因素,而POM似乎是河口颗粒有机碳(POC)的主要来源。测试了三个最终成员概念模型,以粗略估算POC源强度,最终目的是限制该亚热带河口的碳收支。红树林派生的POC通量约。估计从鲨鱼河到墨西哥湾的POC值为5.3×10〜5至1.0×10〜6 kg / yr / yr,但应更好地限制评估中使用的最终成员值,以减少变异程度。

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