Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-8619-2017 |
Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft | |
Sayres, David S.1; Dobosy, Ronald2,3; Healy, Claire4; Dumas, Edward2,3; Kochendorfer, John2; Munster, Jason1; Wilkerson, Jordan5; Baker, Bruce2; Anderson, James G.1,4,5 | |
2017-07-14 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The Arctic terrestrial and sub-sea permafrost region contains approximately 30% of the global carbon stock, and therefore understanding Arctic methane emissions and how they might change with a changing climate is important for quantifying the global methane budget and understanding its growth in the atmosphere. Here we present measurements from a new in situ flux observation system designed for use on a small, low-flying aircraft that was deployed over the North Slope of Alaska during August 2013. The system combines a small methane instrument based on integrated cavity output spectroscopy (ICOS) with an air turbulence probe to calculate methane fluxes based on eddy covariance. We group surface fluxes by land class using a map based on LandSat Thematic Mapper (TM) data with 30m resolution. We find that wet sedge areas dominate the methane fluxes with a mean flux of 2.1 mu gm(-2) s(-1) during the first part of August. Methane emissions from the Sagavanirktok River have the second highest at almost 1 mu gm(-2) s(-1). During the second half of August, after soil temperatures had cooled by 7 degrees C, methane emissions fell to between 0 and 0.5 mu gm(-2) s(-1) for all areas measured. We compare the aircraft measurements with an eddy covariance flux tower located in a wet sedge area and show that the two measurements agree quantitatively when the footprints of both overlap. However, fluxes from sedge vary at times by a factor of 2 or more even within a few kilometers of the tower demonstrating the importance of making regional measurements to map out methane emissions spatial heterogeneity. Aircraft measurements of surface flux can play an important role in bridging the gap between ground-based measurements and regional measurements from remote sensing instruments and models. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405466900003 |
WOS关键词 | CAVITY OUTPUT SPECTROSCOPY ; CARBON-DIOXIDE ; AIRBORNE OBSERVATIONS ; QUALITY-ASSURANCE ; BOUNDARY-LAYER ; ENERGY FLUXES ; COASTAL-PLAIN ; NET CO2 ; ALASKA ; LANDSCAPE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
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/30790 |
专题 | 地球科学 |
作者单位 | 1.Harvard Univ, Paulson Sch Engn & Appl Sci, 12 Oxford St, Cambridge, MA 02138 USA; 2.NOAA, Atmospher Turbulence & Diffus Div, ARL, Oak Ridge, TN 37830 USA; 3.Oak Ridge Associated Univ, Oak Ridge, TN 37830 USA; 4.Harvard Univ, Dept Earth & Planetary Sci, 12 Oxford St, Cambridge, MA 02138 USA; 5.Harvard Univ, Dept Chem & Chem Biol, 12 Oxford St, Cambridge, MA 02138 USA |
推荐引用方式 GB/T 7714 | Sayres, David S.,Dobosy, Ronald,Healy, Claire,et al. Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(13). |
APA | Sayres, David S..,Dobosy, Ronald.,Healy, Claire.,Dumas, Edward.,Kochendorfer, John.,...&Anderson, James G..(2017).Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(13). |
MLA | Sayres, David S.,et al."Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.13(2017). |
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