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	Estimating wetland methane emissions from the northern high latitudes from 1990 to 2009 using artificial neural networks
	Zhu X. D. ; Zhuang Q. L. ; Qin Z. C. ; Glagolev M. ; Song L. L.
	2013
关键词	methane emissions northern wetlands neural networks annual carbon balance atmospheric methane terrestrial ecosystems water-table ch4 flux model temperature permafrost peatland tundra
英文摘要	Methane (CH4) emissions from wetland ecosystems in nothern high latitudes provide a potentially positive feedback to global climate warming. Large uncertainties still remain in estimating wetland CH4 emisions at regional scales. Here we develop a statistical model of CH4 emissions using an artificial neural network (ANN) approach and field observations of CH4 fluxes. Six explanatory variables (air temperature, precipitation, water table depth, soil organic carbon, soil total porosity, and soil pH) are included in the development of ANN models, which are then extrapolated to the northern high latitudes to estimate monthly CH4 emissions from 1990 to 2009. We estimate that the annual wetland CH4 source from the northern high latitudes (north of 45 degrees N) is 48.7 (4) yr(-1) (1 (12)g) with an uncertainty range of 44.0 similar to 53.7 (4) yr(-1). (4) emissions show a large spatial variability over the northern high latitudes, due to variations in hydrology, climate, and soil conditions. Significant interannual and seasonal variations of wetland CH4 emissions exist in the past 2 decades, and the emissions in this period are most sensitive to variations in water table position. (4) dynamics in this region, research priorities should be directed to better characterizing hydrological processes of wetlands, including temporal dynamics of water table position and spatial dynamics of wetland areas.
出处	Global Biogeochemical Cycles
卷	27
期	2
页	592-604
收录类别	SCI
语种	英语
ISSN号	0886-6236
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29979]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhu X. D.,Zhuang Q. L.,Qin Z. C.,et al. Estimating wetland methane emissions from the northern high latitudes from 1990 to 2009 using artificial neural networks. 2013.

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