该数据集包含了2013年7月14日至2013年12月11日的黑河水文气象观测网下游农田站的涡动相关仪观测数据。站点位于内蒙古额济纳旗四道桥，下垫面是甜瓜。观测点的经纬度是101.1338E, 42.0048N，海拔875m。涡动相关仪的架高3.5m，采样频率是10Hz，超声朝向是正北向，超声风速温度仪与CO2/H2O分析仪之间的距离是0cm。
\n涡动相关仪的原始观测数据为10Hz，发布的数据是采用Edire软件处理的30分钟数据，其处理的主要步骤包括：野点值剔除，延迟时间校正，坐标旋转（二次坐标旋转），频率响应修正，超声虚温修正和密度（WPL）修正等。同时对各通量值进行质量评价，主要是大气平稳性（Δst）和湍流相似性特征（ITC）的检验。对Edire软件输出的30min通量值也进行了筛选：（1）剔除仪器出错时的数据；（2）剔除降水前后1h的数据；（3）剔除10Hz原始数据中每30min内缺失率大于3%的数据；（4）剔除夜间弱湍流的观测数据（u*小于0.1m/s）。观测数据的平均周期为30分钟，一天48个数据，缺失数据标记为-6999。因仪器漂移等原因引起的可疑数据用红色字体标识。其中7月29日-8月9日采集器存储出现问题，12月11日-12月31日CO2/H2O分析仪标定，期间数据缺失。
\n发布的观测数据包括：日期/时间Date/Time，风向Wdir（°），水平风速Wnd（m/s），侧向风速标准差Std_Uy（m/s），超声虚温Tv（℃），水汽密度H2O（g/m3），二氧化碳浓度CO2（mg/m3），摩擦速度Ustar（m/s），稳定度Z/L（无量纲），感热通量Hs（W/m2），潜热通量LE（W/m2），二氧化碳通量Fc（mg/(m2s)），感热通量的质量标识QA_Hs，潜热通量的质量标识QA_LE，二氧化碳通量的质量标识QA_Fc。感热、潜热、二氧化碳通量的质量标识分为三级（质量标识0:（Δst <30, ITC<30）; 1: （Δst <100, ITC<100）; 其余为2）。数据时间的含义，如0:30代表0:00-0:30的平均；数据以*.xls格式存储。
\n水文气象网或站点信息请参考Li et al. (2013)，观测数据处理请参考Liu et al.(2011)。。
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