海河流域多尺度地表通量与气象要素观测数据集：怀来站涡动相关仪（10m塔）-2023

该数据集包含了2023年1月1日至2023年12月31日的10m塔涡动相关仪观测数据。站点位于河北省怀来县东花园镇，下垫面水浇地玉米。观测点的经纬度是115.7880E, 40.3491N，海拔480m。涡动相关仪的采集频率是10Hz，架高为5 m，超声朝向是正北向，超声风速仪（CSAT3）与CO2/H2O分析仪（Li7500A）之间的距离是15 cm。
发布的数据是采用Eddypro软件对原始采集的10Hz数据进行后处理得到的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。对处理后输出的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原始数据每30min内缺失率大于10%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。
涡动相关仪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（K），水汽密度H2O（g/m3），二氧化碳浓度CO2（mg/m3），摩擦速度Ustar（m/s），奥布霍夫长度L，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。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。
观测试验或站点信息请参考Guo et al.(2020)，数据处理请参考Liu et al. (2013)。

This dataset contains 10-meter tower eddy covariance observational data from January 1, 2023 to December 31, 2023. The observation site is located in Donghuayuan Town, Huailai County, Hebei Province, with the underlying surface being irrigated cropland planted with maize. The geographic coordinates of the observation point are 115.7880°E, 40.3491°N, and the elevation is 480 m. The eddy covariance system has a sampling frequency of 10 Hz, an installation height of 5 m, the ultrasonic anemometer is oriented towards true north, and the distance between the ultrasonic anemometer (CSAT3) and the CO2/H2O analyzer (Li7500A) is 15 cm.

The released data are 30-minute flux data processed from the original 10 Hz raw data using EddyPro software. The main processing steps include: outlier removal, time lag correction, coordinate rotation (double coordinate rotation), frequency response correction, ultrasonic virtual temperature correction, and density (WPL) correction. Quality assessments were conducted for each flux value, mainly including tests of atmospheric stationarity (Δst) and turbulent similarity characteristics (ITC). The processed 30-minute flux outputs were further screened according to the following criteria: (1) Remove data collected during instrument malfunctions; (2) Remove data within 1 hour before and after precipitation events; (3) Remove data with a missing rate greater than 10% in the 10 Hz raw data per 30-minute window; (4) Remove nocturnal weak turbulence observations (friction velocity u* < 0.1 m/s). The average sampling period of the observational data is 30 minutes, resulting in 48 data points per day, and missing data are marked as -6999.

The released eddy covariance observational data include the following variables: Date/Time, wind direction (Wdir, °), horizontal wind speed (Wnd, m/s), lateral wind speed standard deviation (Std_Uy, m/s), ultrasonic virtual temperature (Tv, K), water vapor density (H2O, g/m³), carbon dioxide concentration (CO2, mg/m³), friction velocity (Ustar, m/s), Obukhov length (L), sensible heat flux (Hs, W/m²), latent heat flux (LE, W/m²), carbon dioxide flux (Fc, mg/(m²s)), quality flag of sensible heat flux (QA_Hs), and quality flag of latent heat flux (QA_LE). The quality flags for sensible heat flux, latent heat flux, and carbon dioxide flux are divided into three levels: Flag 0: (Δst < 30, ITC < 30); Flag 1: (Δst < 100, ITC < 100); all others are classified as Flag 2. The meaning of the data timestamp: for example, 0:30 represents the average value of the period 0:00-0:30. All data are stored in *.xls format.

For details of the observational experiment and site information, please refer to Guo et al. (2020); for the data processing procedures, please refer to Liu et al. (2013).

搜集汇总

背景与挑战

背景概述

该数据集包含2023年怀来站10m塔涡动相关仪观测的30分钟平均地表通量与气象要素数据，覆盖水浇地玉米下垫面，经严格质量控制和处理，适用于水文和大气研究。数据包括风向、风速、感热通量、潜热通量等关键参数，以.xls格式存储。