Qilian Mountains integrated observatory network: Dataset of Heihe integrated observatory network (large aperture scintillometer of Sidaoqiao superstation, 2018)

This dataset contains the flux measurements from the large aperture scintillometer (LAS) at Sidaoqiao Superstation in the Heihe integrated observatory network from January 1 to December 31 in 2018. There were one German BLS900 at Sidaoqiao Superstation. The north tower was set up with the BLS900 receiver and the south tower was equipped with the BLS900 transmitter. The site (north: 101.137° E, 42.008° N; south: 101.131° E, 41.987 N) was located in Ejinaqi, Inner Mongolia. The underlying surfaces between the two towers were tamarisk, populus, bare land and farmland. The elevation is 873 m. The effective height of the LAS was 25.5 m, and the path length was 2350 m. The data were sampled 1 minute.The raw data acquired at 1 min intervals were processed and quality controlled. The data were subsequently averaged over 30 min periods, in which sensible heat flux was iteratively calculated by combining Cn2 with meteorological data according to the Monin-Obukhov similarity theory. The main quality control steps were as follows: (1) The data were rejected when Cn2 exceeded the saturated criterion (Cn2>7.58E-14). (2) The data were rejected when the demodulation signal was small (Average X Intensity<1000). (3) The data were rejected when collected during precipitation. (4) The data were rejected if collected at night when weak turbulence occurred (u* was less than 0.1 m/s). In the iteration process, the universal functions of Thiermann and Grassl, 1992 was selected. Detailed can refer to Liu et al. (2011, 2013).Several instructions were included with the released data. (1) The missing data from the BLS900 instrument were denoted by -6999. (2) The dataset contained the following variables: Date/time (yyyy/m/d h:mm), the structural parameter of the air refractive index (Cn2, m-2/3), and the sensible heat flux (H_LAS, W/m^2). In this dataset, a time of 0:30 corresponds to the average data for the period between 0:00 and 0:30, and the data were stored in *.xlsx format. Moreover, suspicious data were marked in red.For more information, please refer to Liu et al. (2018) (for sites information), Liu et al. (2011) (for data processing) in the Citation section.

本数据集收录了2018年1月1日至12月31日期间，黑河综合观测网沙坨桥超级站大型孔径闪烁仪（LAS）的通量测量数据。沙坨桥超级站装备了一台德国BLS900仪器。北塔安装了BLS900接收器，而南塔则配备了BLS900发射器。观测站点（北：东经101.137°，北纬42.008°；南：东经101.131°，北纬41.987°）位于内蒙古额济纳旗。两塔之间的地表覆盖包括柽柳、杨树、裸地和农田。海拔高度为873米。LAS的有效高度为25.5米，路径长度为2350米。数据以1分钟为采样间隔。每分钟间隔采集的原始数据经过处理和质量控制。随后，数据在30分钟的时间段内进行平均，其中感热通量通过结合Cn2与气象数据，依据Monin-Obukhov相似性理论进行迭代计算。主要的质量控制步骤包括：（1）当Cn2超过饱和标准（Cn2>7.58E-14）时，数据将被拒绝；（2）当解调信号微弱（平均X强度<1000）时，数据将被拒绝；（3）在降水期间收集的数据将被拒绝；（4）当夜间发生弱湍流（摩擦速度u*小于0.1 m/s）时，收集的数据将被拒绝。在迭代过程中，选用了Thiermann和Grassl于1992年提出的通用函数。详细信息可参考Liu等（2011，2013）。发布数据时包含了几项指令：（1）BLS900仪器缺失的数据用-6999表示；（2）数据集包含以下变量：日期/时间（yyyy/m/d h:mm）、空气折射指数的结构参数（Cn2，m-2/3）和感热通量（H_LAS，W/m^2）。在本数据集中，0:30的时间点对应于0:00至0:30时间段内的平均数据，数据以*.xlsx格式存储。此外，可疑数据以红色标记。更多信息请参阅引用部分的Liu等（2018）（关于站点信息），Liu等（2011）（关于数据处理）。