如果不考虑水和大气中二氧化碳的日变化,就会高估河流的二氧化碳排放量

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Theresa Reichenpfader, Katrin Attermeyer
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引用次数: 0

摘要

溪流是大气中二氧化碳(CO2)的重要排放源,受到二氧化碳昼夜动态的影响。然而,我们对溪流内二氧化碳的昼夜变化、溪流上方空气中二氧化碳的昼夜动态以及对排放计算的影响知之甚少。我们对五条高山前溪流进行了研究,在每条溪流附近(相距约 1 公里)的三个地点安装了自动测井站,连续记录水和空气中的二氧化碳分压(pCO2)2-4 天。所有溪流和地点都显示夜间 pCO2 升高,白天 pCO2 降低,但大气 pCO2 的昼夜振幅比水高四倍。与动态测量的大气二氧化碳相比,用固定的二氧化碳通量计算扩散性二氧化碳通量的结果要低 431%,可以忽略不计。因此,我们目前可能过高估计了河川的二氧化碳排放量,应该将水和空气中二氧化碳的昼夜变化包括在内,以更准确地评估河川的二氧化碳排放量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Stream CO2 emissions are overestimated without consideration of diel water and atmospheric CO2 variability

Stream CO2 emissions are overestimated without consideration of diel water and atmospheric CO2 variability

Streams are significant emitters of carbon dioxide (CO2) to the atmosphere that are influenced by diel CO2 dynamics. However, we know little about diel CO2 variability within streams, the diel dynamics of CO2 in the air above streams, and the consequences for emission calculations. We studied five pre-alpine streams by equipping three sites per stream in close proximity (~ 1 km apart) with automatic logging stations that continuously recorded water and air CO2 partial pressures (pCO2) for 2–4 d. All streams and sites showed increased pCO2 at night and decreased pCO2 during the day, however, with fourfold higher diel amplitudes for atmospheric pCO2 compared to the water. Calculating diffusive CO2 fluxes with fixed compared to dynamic measured atmospheric CO2 resulted in negligible to 431% lower estimates. We might thus currently overestimate fluvial CO2 emissions and should include diel water and air CO2 variability to more accurately assess stream CO2 emissions.

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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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