黑河流域地表过程综合观测网（大满超级站涡动相关仪-2023）

该数据集包含了2023年1月1日至2023年12月31日的黑河流域地表过程综合观测网中游大满超级站开路涡动相关仪观测数据。站点位于甘肃省张掖市大满灌区内，下垫面是玉米。观测点的经纬度是100.37223E, 38.85551N，海拔1556.06m。涡动相关仪的架高4.5m，采样频率是10Hz，超声朝向是正北向，超声风速温度仪（CSAT3）与CO2/H2O分析仪（Li7500A）之间的距离是17cm。
涡动相关仪的原始观测数据为10Hz，发布的数据是采用Eddypro软件处理的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Eddypro软件输出的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原始数据中每30min内缺失率大于10%的数据。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。
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（℃），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（m），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，二氧化碳通量的质量标识QA_Fc。感热、潜热、二氧化碳通量的质量标识分为九级（质量标识1-3数据质量好，4-6数据质量较好，7-8数据质量较差（较插补数据好）；9数据质量差））。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。
黑河流域地表过程综合观测网或站点信息请参考Liu et al. (2018)和Che et al. (2019)。

This dataset contains observations from the open-path eddy covariance system at the Daman Super Station in the middle reaches of the Heihe River Basin Surface Process Comprehensive Observation Network, covering the period from January 1, 2023 to December 31, 2023. The station is located in the Daman Irrigation District, Zhangye City, Gansu Province, with a maize underlying surface. The observation site has coordinates of 100.37223°E, 38.85551°N, and an altitude of 1556.06 m. The eddy covariance system is installed at a height of 4.5 m, with a sampling frequency of 10 Hz. The ultrasonic transducer is oriented towards true north, and the distance between the ultrasonic anemometer and temperature sensor (CSAT3) and the CO2/H2O analyzer (Li7500A) is 17 cm.

The raw observational data from the eddy covariance system is at 10 Hz. The released data are 30-minute averaged data processed using the EddyPro software. The main processing steps include: outlier removal, time lag correction, double coordinate rotation, frequency response correction, virtual temperature correction, and density (WPL) correction. Additionally, quality assessments were conducted for each flux value, mainly including tests of atmospheric stationarity (Δst) and turbulence similarity characteristics (ITC). Further screening was performed on the 30-minute flux outputs from EddyPro: (1) removing data collected during instrument malfunctions; (2) removing data within 1 hour before and after precipitation events; (3) removing data with a missing rate greater than 10% in the 30-minute 10Hz raw data. The average period of the observational data is 30 minutes, resulting in 48 data points per day, and missing data are marked as -6999.

The released 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 (℃), water vapor density H2O (g/m³), carbon dioxide concentration CO2 (mg/m³), friction velocity Ustar (m/s), Obukhov length L (m), 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, quality flag of latent heat flux QA_LE, and quality flag of carbon dioxide flux QA_Fc. The quality flags for sensible heat, latent heat, and carbon dioxide fluxes are divided into nine levels: flags 1–3 indicate good data quality, 4–6 indicate fair data quality, 7–8 indicate poor data quality (better than interpolated data), and 9 indicates very poor data quality. The meaning of the data timestamp: 0:30 represents the average value of the period 0:00–0:30. All data are stored in *.xls format.

For information on the Heihe River Basin Surface Process Comprehensive Observation Network or individual stations, please refer to Liu et al. (2018) and Che et al. (2019).

搜集汇总

背景与挑战

背景概述

该数据集包含2023年黑河流域大满超级站的涡动相关仪观测数据，覆盖全年时间范围，提供30分钟间隔的多项气象和通量数据。数据经过严格的质量控制和处理，适用于地表过程研究，特别是农田生态系统的能量和物质交换分析。