涡动相关涡动相关仪观测蒸散量的插补方法比较

doi:10.11867/j.issn.1001-8166.2009.04.0372

地球科学进展 ›› 2009, Vol. 24 ›› Issue (4): 372 -382. doi: 10.11867/j.issn.1001-8166.2009.04.0372

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

收稿日期:2008-12-29 修回日期:2009-03-04 出版日期:2009-04-10
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
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.

Comparison of the Gap Filling Methods of Evapotranspiration Measured by Eddy Covariance System

Xu Ziwei ¹, Liu Shaomin ¹, Xu Tongren ¹, Wang Jiemin ²

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

Received:2008-12-29 Revised:2009-03-04 Online:2009-04-10 Published:2009-04-10

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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

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.

中图分类号:

P414

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