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地球科学进展  2009, Vol. 24 Issue (4): 372-382    DOI: 10.11867/j.issn.1001-8166.2009.04.0372
综述与评述     
涡动相关涡动相关仪观测蒸散量的插补方法比较
徐自为1,刘绍民1*,徐同仁1,王介民2
1.北京师范大学遥感科学国家重点实验室,地理学与遥感科学学院,北京 100875;2.中国科学院寒区旱区环境与工程研究所,甘肃 兰州 730000
Comparison of the Gap Filling Methods of Evapotranspiration Measured by Eddy Covariance System
Xu Ziwei1, Liu Shaomin1, Xu Tongren1, Wang Jiemin2
1.State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University,Beijing 100875, China;
2.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
 全文: PDF(2297 KB)  
摘要:

     涡动相关仪在长时间连续观测中,观测数据会有不同程度的缺失。应用6种不同的插补方法(平均昼夜变化法MDV,非线性回归方法NLR,动态线性回归方法DLR,查表法LUT,FAO-PM方法,HANTS方法)对北京密云站2007年涡动相关仪观测蒸散量数据进行了插补。结果表明: LUT方法在不同数据缺失时均得到较好结果(均方差小于8 W/m2);MDV和NLR方法更适合于短时间数据缺失的插补; DLR和FAO-PM方法在观测数据出现连续波动时插补结果较差。由LUT、DLR、NLR、HANTS、FAO-PM方法得到的年蒸散量分别为395.8 mm、409.9 mm、393.5 mm、390.7 mm、399.4 mm,差异在2.3~19.2 mm之间变化。对比分析了LUT方法得到的年蒸散量(潜热通量)与净辐射、降水量以及LAS观测潜热通量间的变化规律,表明插补结果合理。

关键词: 涡动相关仪蒸散量缺失数据插补方法    
Abstract:

      Data missing is inevitable in long-term eddy covariance system measurement. Several gap filling methods are chosen and applied in the data sets of Miyun station in 2007. These methods include mean diurnal variation (MDV), look-up tables (LUT), nonlinear regressions (NLR), Dynamic linear regression (DLR), Harmonic analysis of time series (HANTS) as well as the method of Penman-Monteith recommend by Food and Agricultural Organization (FAO-PM). The impacts of different gap filling methods on the evapotranspiration are investigated and the results are tested. The result shows: LUT method is stable in every data missing cases (RMSD less than 8 W/m2); MDV and NLR methods are more suitable for short data missing; The gap filling results of DLR and FAO-PM methods are not good if the observed data have large change continuously. The Annual ET obtained by LUT, DLR, NLR, HANTS, FAO-PM methods are 395.8mm, 409.9mm, 393.5mm,390.7mm,399.4mm. The difference between annual ET filled by different methods resulted in a range of 2.3~19.2mm per year. The annual ET obtained by LUT method is compared to net radiation, precipitation and latent heat flux measured by LAS; it is shows that the results are reasonable.

Key words: Eddy covariance system    Evapotranspiration    Data missing    Gap filling methods.
收稿日期: 2008-12-29 出版日期: 2009-04-10
:  P414  
基金资助:

公益性行业(气象)科研专项“大尺度水热通量观测系统的研制与应用研究”(编号:GYHY200706046);中国高技术研究发展计划项目“非均匀下垫面条件下区域蒸散量遥感监测与验证的关键技术研究”(编号:2007AA12Z175);国家自然科学基金项目“非均匀下垫面上卫星像元尺度地表通量的研究”(编号:40671128)资助.

通讯作者: 刘绍民(1967-),男,浙江绍兴人,教授,主要从事陆面过程观测与遥感应用研究.     E-mail: smliu@bnu.edu.cn
作者简介: 徐自为(1981-),男,吉林梨树人,博士研究生,主要从事地表通量观测数据的处理与分析研究 E-mail:x_ziwei@yahoo.com.cn
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引用本文:

徐自为,刘绍民,徐同仁,王介民. 涡动相关涡动相关仪观测蒸散量的插补方法比较[J]. 地球科学进展, 2009, 24(4): 372-382.

Xu Ziwei, Liu Shaomin, Xu Tongren, Wang Jiemin. Comparison of the Gap Filling Methods of Evapotranspiration Measured by Eddy Covariance System. Advances in Earth Science, 2009, 24(4): 372-382.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2009.04.0372        http://www.adearth.ac.cn/CN/Y2009/V24/I4/372

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