海河流域多尺度地表通量与气象要素观测数据集：密云站-大孔径闪烁仪（2008-2010）

该数据集包含了2008年1月1日至2010年12月29日的大孔径闪烁仪观测数据。站点位于北京市密云县新城子镇，下垫面是果园（李子树和苹果树）、玉米/裸地、城镇。观测点的经纬度是117.3233E，40.6308N，海拔350m。

大孔径闪烁仪的采集频率为1Hz，有效高度为35.86m，光径长度是2420m，发射端经纬度是117.3319E，40.6446N，接收端的经纬度是117.3174E，40.6254N。大孔径闪烁仪发布的数据为经过处理与质量控制后的30min平均数据，其中感热通量主要是结合自动气象站数据，基于莫宁-奥布霍夫相似理论通过迭代计算得到，主要的质量控制步骤包括：（1）剔除Cn2达到饱和的数据；（2）剔除解调信号强度较弱的数据；（3）剔除降水时刻及其前后一小时的数据；（4）剔除稳定条件下的弱湍流的数据（u*小于0.1m/s）。

大孔径闪烁仪发布的数据包括：日期/时间Date/Time，空气折射指数结构参数Cn2（m-2/3），感热通量H_LAS（W/m2）。
观测试验或站点信息请参考 Jia et al,(2012)，数据处理请参考Liu et al.(2013)。

This dataset contains large aperture scintillometer (LAS) observation data from January 1, 2008 to December 29, 2010. The observation site is located in Xinchengzi Town, Miyun County, Beijing, with underlying surfaces including orchards (plum and apple trees), corn/barren land, and urban areas. The geographic coordinates of the observation point are 117.3233°E, 40.6308°N, with an elevation of 350 m.

The large aperture scintillometer has a sampling frequency of 1 Hz, an effective height of 35.86 m, and an optical path length of 2420 m. The geographic coordinates of the transmitter are 117.3319°E, 40.6446°N, and those of the receiver are 117.3174°E, 40.6254°N.

The data released by the LAS are 30-minute averaged data that have undergone processing and quality control. The sensible heat flux is mainly calculated iteratively based on the Monin-Obukhov similarity theory, combined with automatic weather station data. The main quality control procedures include:
(1) Removing data with saturated Cn²;
(2) Removing data with weak demodulated signal strength;
(3) Removing data during precipitation and one hour before and after the precipitation event;
(4) Removing data with weak turbulence under stable conditions (u* < 0.1 m/s).

The data released by the LAS include: date/time (Date/Time), atmospheric refractive index structure parameter Cn² (m^-2/3), and sensible heat flux H_LAS (W/m²).

Please refer to Jia et al. (2012) for the observation experiment and site information, and Liu et al. (2013) for the data processing procedures.