HiWATER: Dataset of hydrometeorological observation network (eddy covariance system of barren-land station, 2014)

This data set contains the eddy correlativity observation data of the naked earth station downstream of heihe hydrometeorological observation network from January 1, 2014 to December 31, 2014.The station is located in Inner Mongolia ejin banner four bridge, the underlying surface is bare ground.The longitude and latitude of the observation point are 101.1326e, 41.9993n and 878m above sea level.The rack height of the vortex correlativity meter is 3.5m, the sampling frequency is 10Hz, the ultrasonic orientation is due north, and the distance between the ultrasonic wind speed and temperature meter (CSAT3) and CO2/H2O analyzer (Li7500) is 15cm.The original observation data of the vortex correlativity instrument is 10Hz, and the published data is the 30-minute data processed by Eddypro software. The main processing steps include: outliers, delay time correction, coordinate rotation (quadratic coordinate rotation), frequency response correction, ultrasonic virtual temperature correction and density (WPL) correction.Quality assessment for each intercompared to at the same time, mainly is the atmospheric stability (Δ st) and turbulent characteristics of similarity (ITC) test.The 30min pass value output by Eddypro software was also screened :(1) data when instrument error was eliminated;(2) data of 1h before and after precipitation are excluded;(3) remove the data with a missing rate of more than 10% in the original 10Hz data within every 30 minutes;(4) the observation data of weak turbulence at night (u* less than 0.1m/s) were excluded.The average observation period was 30 minutes, 48 data per day, and the missing data was marked as -6999.Suspicious data caused by instrument drift, etc., shall be marked in red font.The published observational data include:Date/Time for the Date/Time, wind Wdir (°), Wnd horizontal wind speed (m/s), standard deviation Std_Uy lateral wind speed (m/s), ultrasonic virtual temperature Tv (℃), the water vapor density H2O (g/m3), carbon dioxide concentration CO2 (mg/m3), friction velocity Ustar) (m/s), stability Z/L (dimensionless), sensible heat flux Hs (W/m2), latent heat flux LE (W/m2), carbon dioxide flux Fc (mg/(m2s)), the quality of the sensible heat flux identifier QA_Hs, the quality of the latent heat flux identifier QA_LE,Quality indicator for co2 flux QA_Fc.The quality of the sensible heat and latent heat, carbon dioxide flux identification is divided into three (quality id 0: (Δ st < 30, the ITC < 30);1: (Δ st < 100, ITC < 100);The rest is 2).The meaning of data time, such as 0:30 represents the average of 0:00-0:30;The data is stored in *.xls format.For information of hydrometeorological network or station, please refer to Li et al.(2013), and for observation data processing, please refer to Liu et al.(2011).

本数据集收录了自2014年1月1日至2014年12月31日期间，黑河水文气象观测网络下游裸露地表的地球站涡度相关观测数据。该站位于内蒙古自治区额济纳旗四桥，其下垫面为裸地。观测点的经纬度为东经101.1326度，北纬41.9993度，海拔高度为878米。涡度相关仪的架设高度为3.5米，采样频率为10Hz，超声波朝向正北，超声波风速与温度计（CSAT3）与CO2/H2O分析仪（Li7500）之间的距离为15厘米。涡度相关仪的原始观测数据为10Hz，发布的数据为经Eddypro软件处理的30分钟数据。主要处理步骤包括：异常值剔除、延迟时间校正、坐标旋转（二次坐标旋转）、频率响应校正、超声波虚拟温度校正和密度（WPL）校正。对每次比较的数据进行质量评估，主要针对大气稳定性（Δst）和湍流特性相似性（ITC）测试。Eddypro软件输出的30分钟通过值也进行了筛选：（1）消除仪器误差后的数据；（2）排除降水前后1小时内的数据；（3）剔除每30分钟内原始10Hz数据中缺失率超过10%的数据；（4）排除夜间弱湍流（u*小于0.1m/s）的观测数据。平均观测周期为30分钟，每日48个数据点，缺失数据以-6999标记。由仪器漂移等因素引起的可疑数据将以红色字体标注。发布的数据包括：日期/时间、风向（°）、风速（m/s）、横向风速标准差 Std_Uy（m/s）、超声波虚拟温度 Tv（℃）、水汽密度 H2O（g/m3）、二氧化碳浓度 CO2（mg/m3）、摩擦速度 Ustar（m/s）、稳定性 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)）、感热通量标识器质量 QA_Hs、潜热通量标识器质量 QA_LE、CO2通量质量指标。感热和潜热、二氧化碳通量的质量标识分为三级（质量标识ID 0：（Δst < 30，ITC < 30）；1：（Δst < 100，ITC < 100）；其余为2）。数据时间意义，如0:30代表0:00-0:30的平均值；数据存储为*.xls格式。有关水文气象网络或站点的信息，请参阅Li等（2013）的研究，而观测数据处理方法请参考Liu等（2011）的研究。