冰川湖的甲烷排放:针对阿加西兹湖的综合研究

IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
Laura S. Brosius , Katey M. Walter Anthony , Thomas V. Lowell , Peter Anthony , Jeffery P. Chanton , Miriam C. Jones , Guido Grosse , Andy J. Breckenridge
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引用次数: 0

摘要

在上一次冰川退化期间,大型冰川湖可能是一个重要的甲烷来源。如今,北半球的冰川湖泊很小,而且大多局限于格陵兰岛、阿拉斯加和加拿大的冰原边缘,但在上一次冰川期,更大的冰川湖泊共同淹没了北半球数百万平方公里的地区。我们综合了从阿拉斯加和格陵兰岛的现代冰期湖泊测量到的新的和现有的甲烷通量,并利用这些数据以及重建的湖泊面积和水深测量、沉积物有机地球化学的新的古记录、碳积累和其他代用指标,广泛地制约了北美单一大型冰期湖泊阿加西兹湖的可能的冰期甲烷动态。虽然大量冰川物质的涌入导致湖泊初始阶段有机碳的快速埋藏,但这些碳的生物可利用性有限,因为它们很可能来源于冰川下并经过微生物处理。37-90% 湖区的水深为 20 米,这有利于甲烷在水体中大量氧化,进一步限制了甲烷的排放。根据我们的估算,湖面降低的后期阶段以及随后向浅水和地下环境的重新扩张为甲烷的产生提供了最重要的机会。我们发现,阿加西兹湖很可能是上一次冰期甲烷的一个小来源[0.4-2.7 Tg yr-1 平均值(0.1-9.9 Tg yr-1 95% CI)],与现代野火的排放量相当。虽然目前对过去全球冰川湖泊面积和形态的限制还不完善,无法推断我们的结果,但我们认为这些系统很可能是末次冰川过渡期间甲烷的额外来源,需要进一步研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Methane emissions from proglacial lakes: A synthesis study directed toward Lake Agassiz
Large proglacial lakes could have been a significant methane source during the last deglaciation. Today, proglacial lakes are small and mostly limited in the northern hemisphere to the margins of ice sheets in Greenland, Alaska, and Canada, but much larger proglacial lakes collectively flooded millions of square kilometers in the northern hemisphere over the last deglacial period. We synthesize new and existing methane flux measurements from modern proglacial lakes in Alaska and Greenland and use these data together with reconstructed lake area and bathymetry, new paleorecords of sediment organic geochemistry, carbon accumulation, and other proxies to broadly constrain the possible deglacial methane dynamics of a single large North American proglacial lake, Lake Agassiz. While large influxes of glaciogenic material contributed to rapid organic carbon burial during initial lakes phases, limited bioavailability of this carbon is suggested by its likely subglacial origin and prior microbial processing. Water depths of >20 m across 37–90% of the lake area facilitating significant oxidation of methane within the water column further limited emissions. Later phases of lake lowering and subsequent re-expansion into shallow aquatic and subaerial environments provided the most significant opportunity for methane production according to our estimates. We found that Lake Agassiz was likely a small source [0.4–2.7 Tg yr−1 mean (0.1–9.9 Tg yr−1 95% CI)] of methane during the last deglaciation on par with emissions from modern wildfires. Although poor constraints of past global proglacial lake areas and morphologies currently prevent extrapolation of our results, we suggest that these systems were likely an additional source of methane during the last deglacial transition that require further study.
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来源期刊
Quaternary Science Reviews
Quaternary Science Reviews 地学-地球科学综合
CiteScore
7.50
自引率
15.00%
发文量
388
审稿时长
3 months
期刊介绍: Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.
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