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DOI | 10.1038/s41558-020-0762-8 |
Remote sensing northern lake methane ebullition | |
Engram, M.1; Anthony, K. M. Walter1,2; Sachs, T.3; Kohnert, K.3,4; Serafimovich, A.3,8; Grosse, G.5,6; Meyer, F. J.7 | |
2020-05-11 | |
发表期刊 | NATURE CLIMATE CHANGE |
ISSN | 1758-678X |
EISSN | 1758-6798 |
出版年 | 2020 |
卷号 | 10期号:6页码:511-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Germany |
英文摘要 | Northern lakes are considered a major source of atmospheric methane (CH4), a potent GHG(1,2). 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 pathway(2). 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 lakes(2,3) 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. Arctic lake methane emissions, which occur primarily by ebullition, are difficult to quantify from extrapolating in situ data due to spatial and temporal variability. Remote sensing can detect ebullition, through changes in frozen lake surface properties, reducing uncertainty in emission fluxes. |
领域 | 资源环境 |
收录类别 | SCI-E ; SSCI |
WOS记录号 | WOS:000531795100002 |
WOS关键词 | SYNTHETIC-APERTURE-RADAR ; ARCTIC LAKES ; BACKSCATTER CHARACTERISTICS ; FLUX MEASUREMENTS ; SAR BACKSCATTER ; SHALLOW LAKES ; ICE ; EMISSIONS ; ALASKA ; PERMAFROST |
WOS类目 | Environmental Sciences ; Environmental Studies ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249594 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Alaska Fairbanks, Water & Environm Res Ctr, Fairbanks, AK 99775 USA; 2.Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK USA; 3.GFZ German Res Ctr Geosci, Potsdam, Germany; 4.Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Expt Limnol, Stechlin, Germany; 5.Permafrost Res Ctr, Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Potsdam, Germany; 6.Univ Potsdam, Inst Geosci, Potsdam, Germany; 7.Univ Alaska Fairbanks, Geophys Inst, Fairbanks, AK USA; 8.Deutsch Wetterdienst, Offenbach, Germany |
推荐引用方式 GB/T 7714 | Engram, M.,Anthony, K. M. Walter,Sachs, T.,et al. Remote sensing northern lake methane ebullition[J]. NATURE CLIMATE CHANGE,2020,10(6):511-+. |
APA | Engram, M..,Anthony, K. M. Walter.,Sachs, T..,Kohnert, K..,Serafimovich, A..,...&Meyer, F. J..(2020).Remote sensing northern lake methane ebullition.NATURE CLIMATE CHANGE,10(6),511-+. |
MLA | Engram, M.,et al."Remote sensing northern lake methane ebullition".NATURE CLIMATE CHANGE 10.6(2020):511-+. |
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