祁连山综合观测网：兰州大学寒旱区科学观测网络CARN（寺大隆站涡动相关仪-2020）

该数据集包含了2020年3月26日至2020年10月31日兰州大学寒旱区科学观测网络寺大隆站涡动相关仪观测数据。站点位于甘肃张掖市寺大隆，下垫面是森林。观测点的经纬度是99.926E，38.428N，海拔3146m。涡动相关仪的架高高于冠层4m，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。

This dataset contains eddy covariance system observation data collected at the Sidalong Station of the Cold and Arid Regions Science Observation Network of Lanzhou University from March 26, 2020 to October 31, 2020. The station is located in Sidalong, Zhangye City, Gansu Province, with a forest underlying surface. The observation point has coordinates of 99.926°E, 38.428°N, and an elevation of 3146 m. The eddy covariance system is mounted 4 m above the canopy, with a sampling frequency of 10 Hz. The ultrasonic anemometer is oriented to true north, and the distance between the ultrasonic anemometer (CSAT3) and the CO2/H2O analyzer (Li7500A) is 17 cm. The raw observation data of the eddy covariance system is at 10 Hz, while the released data is 30-minute averaged data processed 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 assessment was conducted for each flux value, mainly including tests of atmospheric stationarity (Δst) and turbulence similarity characteristics (ITC). Additionally, screening was performed on the 30-minute flux values output by EddyPro software: (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 exceeding 10% per 30-minute window from the 10 Hz raw dataset. The average period of the observation data is 30 minutes, with 48 data points per day, and missing data is marked as -6999. The released observation data includes: "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 for sensible heat flux QA_Hs, quality flag for latent heat flux QA_LE, and quality flag for carbon dioxide flux QA_Fc. The quality flags for sensible heat, latent heat, and carbon dioxide fluxes are divided into nine levels: 1–3 represent good data quality, 4–6 represent relatively good data quality, 7–8 represent poor data quality (better than interpolated data), and 9 represents very poor data quality. The data timestamp represents the average of the period from the start time to the timestamp, e.g., 0:30 represents the average of 0:00–0:30. The data is stored in *.xls format.

搜集汇总

背景与挑战

背景概述

该数据集包含2020年3月26日至10月31日兰州大学寒旱区科学观测网络寺大隆站的涡动相关仪观测数据，站点位于甘肃张掖森林地区，海拔3146米，观测变量包括风向、风速、温度、水汽密度、二氧化碳浓度及感热、潜热、二氧化碳通量等。数据经过专业处理和质量控制，发布为30分钟平均数据，适用于寒旱区地表过程研究。