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Spatial Distribution of CO2, CH4, and N2O in the Great Barrier Reef Revealed Through High Resolution Sampling and Isotopic Analysis
Geophysical Research Letters ( IF 4.6 ) Pub Date : 2021-07-30 , DOI: 10.1029/2021gl092534
Michael J. Reading 1, 2 , Damien T. Maher 1 , Isaac R. Santos 3, 4 , Luke C. Jeffrey 1 , Tyler J. Cyronak 5 , Ashly McMahon 3 , Douglas R. Tait 1
Affiliation  

Methane (CH4) and nitrous oxide (N2O) dynamics in coastal coral reef areas are poorly understood. We measured dissolved carbon dioxide (CO2) and CH4 (with δ13C-CO2 and δ13C-CH4 isotope fractions) and N2O in the Great Barrier Reef (GBR) to determine spatial distributions and emissions. CO2 (379–589 μatm) was oversaturated due to calcification and riverine sources, as indicated by depleted δ13C-CO2 values. CH4 (1.5–13.5 nM) was also oversaturated from nearshore biogenic sources indicated by depleted δ13C-CH4 and probable offshore aerobic production. N2O (5.5–6.6 nM) was generally undersaturated, with uptake highest near the coast. Daily CO2 emissions were 5826 ± 1191 tonnes, with CO2 equivalent (eq) N2O uptake (191 ± 44 tonnes) offsetting 3.3% of CO2 or 89% of CH4eq (214 ± 45 tonnes) emissions based on 20-year global warming potentials. The GBR was a slight CO2 and CH4 source and N2O sink during our study. However, further work is required to constrain diurnal, seasonal, and spatial dynamics.

中文翻译:

通过高分辨率采样和同位素分析揭示大堡礁中 CO2、CH4 和 N2O 的空间分布

对沿海珊瑚礁地区的甲烷 (CH 4 ) 和一氧化二氮 (N 2 O) 动态知之甚少。我们测量了大堡礁 (GBR) 中溶解的二氧化碳 (CO 2 ) 和 CH 4(具有 δ 13 C-CO 2和 δ 13 C-CH 4同位素分数)和 N 2 O,以确定空间分布和排放。CO 2 (379–589 μatm) 由于钙化和河流源而过饱和,如耗尽的 δ 13 C-CO 2值所示。CH 4 (1.5–13.5 nM) 也从近岸生物源中过饱和,由耗尽的 δ13 C-CH 4和可能的海上需氧生产。N 2 O (5.5–6.6 nM) 通常不饱和,在海岸附近吸收最高。每日 CO 2排放量为 5826 ± 1191 吨,其中 CO 2当量 ( eq ) N 2 O 吸收量 (191 ± 44 吨) 抵消了 CO 2 的3.3%或 CH 4 eq (214 ± 45 吨) 排放量的89%,基于 20 -年全球变暖潜势。在我们的研究中,GBR 是轻微的 CO 2和 CH 4源以及 N 2 O 汇。然而,需要进一步的工作来限制昼夜、季节性和空间动态。
更新日期:2021-08-10
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