Lotic-SIPCO2:调整开放源码二氧化碳传感器系统,并在一系列溪流大小和土地利用情况下检查相关排放的不确定性

IF 2.1 3区 地球科学 Q2 LIMNOLOGY
Andrew L. Robison, Lauren E. Koenig, Jody D. Potter, Lisle E. Snyder, Christopher W. Hunt, William H. McDowell, Wilfred M. Wollheim
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引用次数: 0

摘要

河网作为大气中二氧化碳(CO2)的相关来源,在全球碳循环中发挥着至关重要的作用。水生环境高频率监测技术的进步使得溶解二氧化碳浓度的时间分辨率测量成为可能,这对于研究这些动态生态系统的碳变化和碳逃逸至关重要。在此,我们介绍了针对湖泊生态系统的开源、成本相对较低的原位 pCO2 传感器系统(lotic-SIPCO2)的调整、部署和验证。我们在 10 条溪流中对 lotic-SIPCO2 进行了测试,这些溪流的土地覆盖面积和流域面积各不相同。针对地段环境的主要系统调整包括防止生物污损、配置可变阶段高度和减少顶空平衡时间。然后,我们研究了哪些输入参数对估算二氧化碳排放率的不确定性影响最大,发现当二氧化碳浓度明显高于饱和度时,与气体交换速度相关的比例因子影响最大。在接近饱和状态时,传感器测量 pCO2 对估计二氧化碳排放量的不确定性影响最大。我们还发现,考虑到溪流的二氧化碳浓度,高频率测量 pCO2 对准确估算中位排放率并无必要,每天至每周采样一次即可。高频率的 pCO2 测量对于探索溪流内部的代谢变异性、源划分和风暴事件动态仍然很有价值。我们对 SIPCO2 的改装为监测地段生态系统中的溶解二氧化碳提供了一种相对经济且稳健的方法。我们的研究结果表明了在设计更广泛的溶解 CO2 和 CO2 逃逸动态监测项目时的优先事项和相关考虑因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Lotic-SIPCO2: Adaptation of an open-source CO2 sensor system and examination of associated emission uncertainties across a range of stream sizes and land uses

Lotic-SIPCO2: Adaptation of an open-source CO2 sensor system and examination of associated emission uncertainties across a range of stream sizes and land uses

River networks play a crucial role in the global carbon cycle, as relevant sources of carbon dioxide (CO2) to the atmosphere. Advancements in high-frequency monitoring in aquatic environments have enabled measurement of dissolved CO2 concentration at temporal resolutions essential for studying carbon variability and evasion from these dynamic ecosystems. Here, we describe the adaptation, deployment, and validation of an open-source and relatively low-cost in situ pCO2 sensor system for lotic ecosystems, the lotic-SIPCO2. We tested the lotic-SIPCO2 in 10 streams that spanned a range of land cover and basin size. Key system adaptations for lotic environments included prevention of biofouling, configuration for variable stage height, and reduction of headspace equilibration time. We then examined which input parameters contribute the most to uncertainty in estimating CO2 emission rates and found scaling factors related to the gas exchange velocity were the most influential when CO2 concentration was significantly above saturation. Near saturation, sensor measurement of pCO2 contributed most to uncertainty in estimating CO2 emissions. We also found high-frequency measurements of pCO2 were not necessary to accurately estimate median emission rates given the CO2 regimes of our streams, but daily to weekly sampling was sufficient. High-frequency measurements of pCO2 remain valuable for exploring in-stream metabolic variability, source partitioning, and storm event dynamics. Our adaptations to the SIPCO2 offer a relatively affordable and robust means of monitoring dissolved CO2 in lotic ecosystems. Our findings demonstrate priorities and related considerations in the design of monitoring projects of dissolved CO2 and CO2 evasion dynamics more broadly.

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来源期刊
CiteScore
4.80
自引率
3.70%
发文量
56
审稿时长
3 months
期刊介绍: Limnology and Oceanography: Methods (ISSN 1541-5856) is a companion to ASLO''s top-rated journal Limnology and Oceanography, and articles are held to the same high standards. In order to provide the most rapid publication consistent with high standards, Limnology and Oceanography: Methods appears in electronic format only, and the entire submission and review system is online. Articles are posted as soon as they are accepted and formatted for publication. Limnology and Oceanography: Methods will consider manuscripts whose primary focus is methodological, and that deal with problems in the aquatic sciences. Manuscripts may present new measurement equipment, techniques for analyzing observations or samples, methods for understanding and interpreting information, analyses of metadata to examine the effectiveness of approaches, invited and contributed reviews and syntheses, and techniques for communicating and teaching in the aquatic sciences.
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