A desiccating saline lake bed is a significant source of anthropogenic greenhouse gas emissions

IF 15.1 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
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Abstract

Saline lake desiccation is widespread and typically caused by anthropogenic withdrawals for agricultural, industrial, and municipal uses, but its impact on greenhouse gas (GHG) emissions is unknown. While dry-flux studies have shown that desiccating waterbodies emit carbon dioxide (CO2) and methane (CH4) from exposed sediments, these studies are often seasonal and for freshwater systems, limiting their application to chronically desiccating saline lakes. We measured CO2 and CH4 emissions (April to November, 2020) from the exposed sediments of Great Salt Lake (Utah, United States), and compared them with aquatic emissions estimates to determine the anthropogenic emissions associated with desiccation. In 2020, the lake bed emitted 4.1 million tons of CO2eq to the atmosphere, primarily (94%) as CO2, constituting a ∼7% increase to Utah’s anthropogenic GHG emissions. As climate change exacerbates drought in arid regions, anthropogenic desiccation and associated climate feedbacks should be considered in assessments of global GHG trajectories as well as local GHG emissions reduction efforts.

Abstract Image

干涸的盐湖湖床是人为温室气体排放的重要来源
盐湖干涸现象非常普遍,通常是由于农业、工业和市政用途的人为取水造成的,但其对温室气体(GHG)排放的影响尚不清楚。虽然干流研究表明,干涸的水体会从暴露的沉积物中排放二氧化碳(CO2)和甲烷(CH4),但这些研究通常是季节性的,而且针对的是淡水系统,因此限制了它们在长期干涸的盐湖中的应用。我们测量了大盐湖(美国犹他州)裸露沉积物的二氧化碳和甲烷排放量(2020 年 4 月至 11 月),并将其与水生排放估计值进行比较,以确定与干燥相关的人为排放量。2020 年,湖床向大气排放了 410 万吨二氧化碳当量,其中主要(94%)为二氧化碳,使犹他州的人为温室气体排放量增加了 7%。由于气候变化加剧了干旱地区的干旱,因此在评估全球温室气体排放轨迹和地方温室气体减排工作时,应考虑人为干燥和相关的气候反馈。
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来源期刊
One Earth
One Earth Environmental Science-Environmental Science (all)
CiteScore
18.90
自引率
1.90%
发文量
159
期刊介绍: One Earth, Cell Press' flagship sustainability journal, serves as a platform for high-quality research and perspectives that contribute to a deeper understanding and resolution of contemporary sustainability challenges. With monthly thematic issues, the journal aims to bridge gaps between natural, social, and applied sciences, along with the humanities. One Earth fosters the cross-pollination of ideas, inspiring transformative research to address the complexities of sustainability.
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