气候变化领域集成服务门户(CCPortal): Remote sensing northern lake methane ebullition

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DOI	10.1038/s41558-020-0762-8
	Remote sensing northern lake methane ebullition
	Engram M.; Walter Anthony K.M.; Sachs T.; Kohnert K.; Serafimovich A.; Grosse G.; Meyer F.J.
发表日期	2020
ISSN	1758-678X
起始页码	511
结束页码	517
卷号	10 期号:6
英文摘要	Northern lakes are considered a major source of atmospheric methane (CH4), a potent GHG1,2. However, large uncertainties in their emissions (7–26 Tg CH4 yr–1; ref. 2) arise from challenges in upscaling field data, including fluxes by ebullition (bubbling), the dominant emission pathway2. Remote sensing of ebullition would allow detailed mapping of regional emissions but has hitherto not been developed. Here, we show that lake ebullition can be imaged using synthetic aperture radar remote sensing during ice-cover periods by exploiting the effect of ebullition on the texture of the ice–water interface. Applying this method to five Alaska regions and combining spatial remote sensing information with year-round bubble-trap flux measurements, we create ebullition-flux maps for 5,143 Alaskan lakes. Regional lake CH4 emissions, based on satellite remote sensing analyses, were lower compared to previous estimates based on upscaling from individual lakes2,3 and were consistent with independent airborne CH4 observations. Thermokarst lakes formed by thaw of organic-rich permafrost had the highest fluxes, although lake density and lake size distributions also controlled regional emissions. This new remote sensing approach offers an opportunity to improve knowledge about Arctic CH4 fluxes and helps to explain long-standing discrepancies between estimates of CH4 emissions from atmospheric measurements and data upscaled from individual lakes. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	carbon emission; ice-dammed lake; lake ecosystem; methane; permafrost; radar altimetry; remote sensing; synthetic aperture radar; thermokarst
语种	英语
来源期刊	Nature Climate Change
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171660
作者单位	Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; GFZ German Research Centre for Geosciences, Potsdam, Germany; Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Stechlin, Germany; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Permafrost Research Center, Potsdam, Germany; Institute of Geosciences, University of Potsdam, Potsdam, Germany; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Deutscher Wetterdienst, Offenbach, Germany
推荐引用方式 GB/T 7714	Engram M.,Walter Anthony K.M.,Sachs T.,et al. Remote sensing northern lake methane ebullition[J],2020,10(6).
APA	Engram M..,Walter Anthony K.M..,Sachs T..,Kohnert K..,Serafimovich A..,...&Meyer F.J..(2020).Remote sensing northern lake methane ebullition.Nature Climate Change,10(6).
MLA	Engram M.,et al."Remote sensing northern lake methane ebullition".Nature Climate Change 10.6(2020).