ChenYuanChenEtAl2011

Référence

Chen, H., Yuan, X., Chen, Z., Wu, Y., Liu, X., Zhu, D., Wu, N., Zhu, Q., Peng, C., Li, W. (2011) Methane emissions from the surface of the Three Gorges Reservoir. Journal of Geophysical Research: Atmospheres, 116(21):D21306. (Scopus )

Résumé

After our previous study about methane (CH 4) emissions from littoral marshes of the Three Gorges Reservoir (TGR), Chinese dams have raised a world-wide concern. Through measurements from the surface of the TGR, a CH 4 emission rate was recorded as 0.26 0.38 mg CH 4 m -2 h -1 (Mean SD), relatively low compared with those from other hydropower reservoirs. We also recorded CH 4 emission rate from the surface of downstream water, which was also relatively low (0.24 0.37 mg CH 4 m -2 h -1). Such result may indicate that TGR is not a great CH 4 emitter (not "CH 4 menace"). One possible reason for such a low emission rate is that measures to maintain water quality and protect environment and ecosystem decrease the input of organic materials (for methanogenesis), which in turn limits the CH 4 production in the sediment of the TGR. We also found that CH 4 emission from the flooding drawdown area (0.29 0.37 mg CH 4 m -2 h -1) was higher than other permanently flooded sites (0.23 0.38 mg CH 4 m -2 h -1). Because of annual vegetation re-growth, the drawdown zone is the especially important carbon source for methanogenesis in flooding season. Interestingly, we also observed that mean CH 4 emission was significantly higher in winter than in spring and summer. This was partly due to seasonal dynamics of hydrology. In order to estimate the net CH 4 emissions caused by the reservoir and reservoir operation, the best approach would be Life Cycle Analysis. Copyright 2011 by the American Geophysical Union.

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@ARTICLE { ChenYuanChenEtAl2011,
    AUTHOR = { Chen, H. and Yuan, X. and Chen, Z. and Wu, Y. and Liu, X. and Zhu, D. and Wu, N. and Zhu, Q. and Peng, C. and Li, W. },
    TITLE = { Methane emissions from the surface of the Three Gorges Reservoir },
    JOURNAL = { Journal of Geophysical Research: Atmospheres },
    YEAR = { 2011 },
    VOLUME = { 116 },
    PAGES = { D21306 },
    NUMBER = { 21 },
    ABSTRACT = { After our previous study about methane (CH 4) emissions from littoral marshes of the Three Gorges Reservoir (TGR), Chinese dams have raised a world-wide concern. Through measurements from the surface of the TGR, a CH 4 emission rate was recorded as 0.26 0.38 mg CH 4 m -2 h -1 (Mean SD), relatively low compared with those from other hydropower reservoirs. We also recorded CH 4 emission rate from the surface of downstream water, which was also relatively low (0.24 0.37 mg CH 4 m -2 h -1). Such result may indicate that TGR is not a great CH 4 emitter (not "CH 4 menace"). One possible reason for such a low emission rate is that measures to maintain water quality and protect environment and ecosystem decrease the input of organic materials (for methanogenesis), which in turn limits the CH 4 production in the sediment of the TGR. We also found that CH 4 emission from the flooding drawdown area (0.29 0.37 mg CH 4 m -2 h -1) was higher than other permanently flooded sites (0.23 0.38 mg CH 4 m -2 h -1). Because of annual vegetation re-growth, the drawdown zone is the especially important carbon source for methanogenesis in flooding season. Interestingly, we also observed that mean CH 4 emission was significantly higher in winter than in spring and summer. This was partly due to seasonal dynamics of hydrology. In order to estimate the net CH 4 emissions caused by the reservoir and reservoir operation, the best approach would be Life Cycle Analysis. Copyright 2011 by the American Geophysical Union. },
    COMMENT = { Export Date: 16 May 2012 Source: Scopus Art. No.: D21306 doi: 10.1029/2011JD016244 },
    ISSN = { 01480227 (ISSN) },
    KEYWORDS = { Carbon source, Emission rates, Flooding season, Hydropower reservoirs, Life cycle analysis, Low emission, Methane emissions, Methanogenesis, Organic materials, Re-growth, Reservoir operation, Seasonal dynamics, Three gorges reservoir, Anoxic sediments, Methane, Surfaces, Water levels, Water quality, Reservoirs (water), atmospheric pollution, dam construction, drawdown, emission inventory, environmental protection, flooding, hydroelectric power plant, life cycle analysis, littoral environment, marsh, methane, methanogenesis, reservoir, seasonal variation, water quality, China, Three Gorges Reservoir },
    OWNER = { Luc },
    TIMESTAMP = { 2012.05.16 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-81255211557&partnerID=40&md5=8241ee927a54eae1023ef634d2a870e1 },
}

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