Eutrophication and urbanization enhance methane emissions from coastal lagoons

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Stefano Bonaglia, Henry L. S. Cheung, Tobia Politi, Irma Vybernaite‐Lubiene, Tristan McKenzie, Isaac R. Santos, Mindaugas Zilius
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Abstract

Coastal lagoons are important nutrient filters and carbon sinks but may release large amounts of methane (CH4) to the atmosphere. Here, we hypothesize that eutrophication and population density will turn coastal lagoons into stronger methane emitters. We report benthic fluxes from 187 sediment cores incubated from three of the largest European lagoons suffering persistent eutrophication. Methane fluxes were mainly driven by sediment porosity, organic matter, and dissolved inorganic carbon (DIC) fluxes. Methane was always supersaturated (250–49,000%) in lagoon waters leading to large, variable emissions of 0.04–26 mg CH4 m−2 d−1. Combining our new dataset with earlier estimates revealed a global coastal lagoon emission of 7.9 (1.4–34.7) Tg CH4 yr−1 with median values of 5.4 mg CH4 m−2 d−1. Lagoons with very highly populated catchments released much more methane (223 mg CH4 m−2 d−1). Overall, projected increases in eutrophication, organic loading and population densities will enhance methane fluxes from lagoons worldwide.
富营养化和城市化加剧了沿海泻湖的甲烷排放
沿海泻湖是重要的营养物过滤器和碳汇,但可能会向大气释放大量甲烷(CH4)。在这里,我们假设富营养化和人口密度将使沿海泻湖成为更强的甲烷排放源。我们报告了从三个遭受持续富营养化的欧洲最大环礁湖培养的 187 个沉积物岩心中提取的底栖生物甲烷通量。甲烷通量主要受沉积物孔隙度、有机物和溶解无机碳(DIC)通量的影响。甲烷在泻湖水域中始终处于过饱和状态(250%-49,000%),导致了大量不同的排放量(0.04-26 毫克 CH4 m-2 d-1)。将我们的新数据集与之前的估计值相结合,发现全球沿海泻湖的甲烷排放量为 7.9 (1.4-34.7) Tg CH4 yr-1,中值为 5.4 mg CH4 m-2 d-1。人口密度非常高的集水区释放的甲烷要多得多(223 毫克 CH4 m-2 d-1)。总体而言,预计富营养化、有机负荷和人口密度的增加将提高全球泻湖的甲烷通量。
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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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