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首页> 外文期刊>Marine Chemistry >Methane and carbon dioxide dynamics in a subtropical estuary over a diel cycle: Insights from automated in situ radioactive and stable isotope measurements
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Methane and carbon dioxide dynamics in a subtropical estuary over a diel cycle: Insights from automated in situ radioactive and stable isotope measurements

机译：Diel循环中亚热带河口的甲烷和二氧化碳动力学：来自自动原位放射性和稳定同位素测量的见解

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摘要

Estuaries have high rates of primary production and respiration and can be hotspots for carbon dioxide and methane enriched submarine groundwater discharge. Here, we report high resolution pCO_2, CH_4, δ~(13)C-CO_2, δ~(13)C-CH_4 and radon (~(222)Rn, a natural groundwater tracer) observations along North Creek estuary, Australia (S28°48', E153°34') during four spatial surveys over a diumal cycle in January 2013 (summer). There were distinct tidal and diurnal differences in estuarine pCO_2 and CH_4, which lead to tidal differences of 3.6 fold and 5 fold in the estimated CO_2 and CH_4 diffusive water to air fluxes respectively, and up to a 2.4 fold difference in diurnal flux estimates of CH_4. Carbon stable isotopes revealed tidal and diurnal differences in the source δ~(13)C value of CO_2 and CH_4, and minor CH_4 oxidation within the estuary. The CO_2 outgassing rates based on the spatial surveys were different than the outgassing derived from three fixed time series stations along the estuary. There was agreement between the methods in the lower and upper estuary where pCO_2 had a relatively low range over the study (～600 μatm and 3000 uatm respectively). However, in the mangrove surrounded mid estuary where pCO_2 ranged from ～1450 to 11,000 μatm over a tidal cycle, fluxes estimated by the survey method were ～30% of the time series estimates. This study highlights the importance of considering tidal and diurnal variability when estimating the flux of CO_2 and CH_4 from estuaries, and discusses how a combination of diurnal (productivity/respiration) and tidal (groundwater/mixing) processes may drive surface water pCO_2 and CH_4 over short-term time scales.
机译：河口的初级生产和呼吸速率很高，可以成为二氧化碳和富含甲烷的海底地下水排放的热点地区。在这里，我们报告了沿澳大利亚北溪河口的高分辨率pCO_2，CH_4，δ〜（13）C-CO_2，δ〜（13）C-CH_4和ra（〜（222）Rn，天然地下水示踪剂）的观测结果（S28在2013年1月（夏季）进行的一个半周期内进行的四次空间勘测中，发现“ 48°”，“ E153°34”）。河口pCO_2和CH_4存在明显的潮汐和昼夜差异，这导致估计的CO_2和CH_4扩散水对空气通量的潮汐差异分别为3.6倍和5倍，而CH_4的日通量估计差异高达2.4倍。碳稳定同位素揭示了河口内CO_2和CH_4的源δ〜（13）C值的潮汐和昼夜差异，以及CH_4的轻微氧化。基于空间调查的CO_2排放率不同于河口三个固定时间序列站的排放率。在下河口和上河口的方法之间存在一致，其中在研究中pCO_2的范围相对较小（分别为〜600μatm和3000 uatm）。然而，在红树林环绕的河口中部，在一个潮汐周期中，pCO_2的变化范围从约1450到11,000μatm，通过调查方法估算的通量约为时间序列估算的30％。这项研究强调了从河口估算CO_2和CH_4的通量时考虑潮汐和日变化的重要性，并讨论了日（生产力/呼吸）和潮（地下水/混合）过程的组合如何驱动地表水pCO_2和CH_4短期时间尺度。

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  • 来源
    《Marine Chemistry》 |2015年第1期|69-79|共11页
  • 作者

    Damien T. Maher; Kirsten Cowley; Isaac R. Santos; Paul Macklin; Bradley D. Eyre;

  • 作者单位

    Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;

    Department of Environment & Geography, Macquarie University, NSW 2109, Australia;

    Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;

    Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;

    Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;

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  • 正文语种 eng
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  • 关键词

    Air-water gas exchange; Greenhouse gas; Carbon stable isotopes; Floodplain; Coastal acid sulfate soils; Wetland;

    机译：空气-水气交换;温室气体;碳稳定同位素;洪泛区沿海酸性硫酸盐土壤;湿地;

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