HiWATER: Dataset of hydrometeorological observation network (eddy covariance system of cropland station, 2014)

This data set contains the observation data of eddy correlativity of farmland stations downstream of heihe hydrometeorological observation network from January 23, 2014 to December 31, 2014.The station is located in Inner Mongolia ejin banner four road bridge, under the surface is melon.The longitude and latitude of the observation point are 101.1338e, 42.0048n and 875m above sea level.The rack height of the vortex correlator 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 (EC150 before April 15 and Li7500A after June 10) is 0cm (before April 15) /15cm (after June 10).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.April 16 solstice June 9 due to the adjustment of the observation tower, data was missing during the period.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23日至2014年12月31日，黑河水文气象观测网络下游农田站点涡度协方差观测数据。观测站位于内蒙古自治区鄂尔多斯市东胜区四路桥，地表为沙土。观测点的经纬度为北纬42.0048度，东经101.1338度，海拔高度为875米。涡度协相关仪的支架高度为3.5米，采样频率为10Hz，超声波指向正北。超声波风速和温度计（CSAT3）与CO2/H2O分析仪（4月15日之前为EC150，6月10日之后为Li7500A）之间的距离为0厘米（4月15日之前）/15厘米（6月10日之后）。涡度协相关仪的原观测数据为10Hz，发布的数据为Eddypro软件处理后的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、超声波虚温校正和密度（WPL）校正。对每个相互比较的数据进行质量评估，主要评估大气稳定性（Δst）和湍流相似性（ITC）测试。Eddypro软件输出的30分钟通过值亦进行了筛选：（1）消除仪器误差的数据；（2）排除降水前后1小时的数据；（3）移除每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，缺失数据标记为-6999。由仪器漂移等引起的可疑数据，将以红色字体标注。4月16日至6月9日，由于观测塔调整，数据缺失。发布的数据包括：日期/时间、风向Wdir（°）、风速Wnd（m/s）、横向风速标准差Std_Uy（m/s）、超声波虚温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、二氧化碳通量识别质量分为三级（质量ID 0：（Δst < 30，ITC < 30）；1：（Δst < 100，ITC < 100）；其余为2）。数据时间意义，如0:30表示0:00-0:30的平均值；数据存储为*.xls格式。关于水文气象网络或站点的信息，请参考Li等（2013）的研究，关于观测数据处理，请参考Liu等（2011）的研究。