干旱区生态环境知识资源中心(Arid): Two energy balance closure approaches: applications and comparisons over an oasis-desert ecotone

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	Two energy balance closure approaches: applications and comparisons over an oasis-desert ecotone
	Pan Xin; Liu Yuanbo; Fan Xingwang; Gan Guojing
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2017
卷号	9 期号:1 页码:51-64
英文摘要	Studies of energy balance that rely on eddy covariance (EC) are always challenged by energy balance closure, which is mainly caused by the underestimations of latent heat flux (LE) and sensible heat flux (Hs). The Bowen ratio (BR) and energy balance residual (ER) approaches are two widely-used methods to correct the LE. A comprehensive comparison of those two approaches in different land-use types is essential to accurately correcting the LE and thus improving the EC experiments. In this study, two energy balance approaches (i.e., BR and ER) were compared to correct the LE measured at six EC sites (i.e., three vegetated, one mixed and two non-vegetated sites) in an oasis-desert ecotone of the Heihe River Basin, China. The influences of meteorological factors on those two approaches were also quantitatively assessed. Our results demonstrated that the average energy closure ratio ((LE+Hs)/(Rn-Gs); where Rn is the surface net radiation and Gs is the surface soil heat flux) was approximately close to 1.0 at wetland, maize and village sites, but far from 1.0 at orchard, Gobi and desert sites, indicating a significant energy imbalance at those three latter sites. After the corrections of BR and ER approaches that took into account of soil heat storage, the corrected LE was considerably larger than the EC-measured LE at five of six EC sites with an exception at Gobi site. The BR and ER approaches yielded approximately similar corrected LE at vegetated and mixed sites, but they generated dissimilar results at non-vegetated sites, especially at non-vegetated sites with low relative humidity, strong wind, and large surface-air temperature difference. Our findings provide insight into the applicability of BR and ER approaches to correcting EC-based LE measurements in different land-use types. We recommend that the BR-corrected and ER-corrected LE could be seriously reconsidered as validation references in dry and windy areas.
英文关键词	energy balance closure eddy covariance Bowen ratio-energy balance approach energy balance residual approach Heihe River Basin
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5905890
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335747
作者单位	Pan Xin, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Key Laboratory of Watershed Geographic Sciences, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China.; Liu Yuanbo, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Key Laboratory of Watershed Geographic Sciences, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China.; Fan Xingwang, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Key Laboratory of Watershed Geographic Sciences, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China.; Gan Guojing, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Key Laboratory of Watershed Geographic Sciences, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China.
推荐引用方式 GB/T 7714	Pan Xin,Liu Yuanbo,Fan Xingwang,et al. Two energy balance closure approaches: applications and comparisons over an oasis-desert ecotone[J],2017,9(1):51-64.
APA	Pan Xin,Liu Yuanbo,Fan Xingwang,&Gan Guojing.(2017).Two energy balance closure approaches: applications and comparisons over an oasis-desert ecotone.Journal of Arid Land,9(1),51-64.
MLA	Pan Xin,et al."Two energy balance closure approaches: applications and comparisons over an oasis-desert ecotone".Journal of Arid Land 9.1(2017):51-64.