| 麦田通量数据质量控制及能量闭合性分析 |
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| 引用本文： | 彭记永,张晓娟.麦田通量数据质量控制及能量闭合性分析[J].气象与环境科学,2016,39(4):68-72. |
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| 作者姓名： | 彭记永 张晓娟 |
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| 摘 要： | 近地面层能量不闭合是涡度相关系统观测中普遍存在的难点问题。为了提高涡度相关系统通量观测数据的质量,选取郑州农业气象试验站2009年10月—2010年6月整个冬小麦生长季的通量观测资料,对30 min通量数据进行野点剔除、数据插补和Webb-Pearman-Leuning(WPL)校正等数据预处理。用两种方法(OLS和EBR)评价了该地区麦田生态系统能量平衡状况。结果表明:处理后的数据质量有明显提升,日平均湍流能增加7.09 W·m~(-2),日平均CO2通量减少0.0730 mg·m~(-2)·s~(-1)。农田涡度相关系统观测的能量平衡比率(EBR)日变化规律明显:早晨和傍晚昼夜交替时EBR波动最大,白天能量闭合状况优于夜间;暖季EBR大部分都在1左右浮动,能量平衡闭合程度较高,而冬季能量平衡闭合程度比暖季偏低。能量通量和湍流通量有较强的相关性,决定系数R2=0.8066,能量闭合度为88%,存在能量不闭合现象。
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| 关 键 词： | 麦田生态系统 涡度相关系统 通量数据 WPL校正 能量平衡 |
Analysis of Flux Data Quality Assessment and Energy Balance Closure in Wheat Field |
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| Peng Jiyong,Zhang Xiaojuan.Analysis of Flux Data Quality Assessment and Energy Balance Closure in Wheat Field[J].Meteorological and Environmental Sciences,2016,39(4):68-72. |
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| Authors: | Peng Jiyong Zhang Xiaojuan |
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| Abstract: | Surface energy imbalance is an universal difficulty in the observation of eddy covariance (EC) systems. In order to improve the quality of flux observation data, the data at Zhengzhou agrometeorological experimental station on the whole winter wheat growth season from October 2009 to June 2010 was selected. Getting rid of the false points, data interpolation and Webb-Pearman-Leuning(WPL) correction were used for data preprocessing on 30 min flux data. Two methods (OLS and EBR) were used to evaluate the energy balance condition in wheat field ecosystem. The results showed that: the quality of data after pretreatment had been improved significantly and the daily average turbulence had increased 7.09 W·m-2, the daily average CO2 flux had reduced 0.0730 mg·m-2· s-1. Energy balance ratio (EBR) had obvious diurnal varialation: EBR fluctuated maximally in the morning and evening when day-night shift. Energy balance closure was better in the daytime than that in the nighttime. In the warm season, EBR mostly fluctuated around 1, the energy balance closure degree was high, which was lower in winter. There is strong correlation between energy fluxes and turbulent fluxes, the coefficient of determination is 0.8066 (R2=0.8066), and energy closure degree is 88%. The phenomenon of energy imbalance existed. |
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| Keywords: | wheat field ecosystem eddy covariance system flux data WPL correction energy balance |
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