黑河生态水文遥感试验：水文气象观测网数据集（农田站自动气象站-2015）

该数据集包含了2015年1月1日至2015年10月29日黑河水文气象观测网下游农田站气象要素观测系统数据。站点位于内蒙古额济纳旗达来呼布镇四道桥，下垫面是甜瓜农田。观测点的经纬度是101.1338E, 42.0048N，海拔875m。四分量辐射仪安装在6m处，朝向正南；两个红外温度计传感器安装在6m处，朝向正南，探头朝向是垂直向下；两个光合有效辐射仪安装在6m处，朝向正南，探头垂直向上和向下方向各一个；土壤温度探头埋设在地表0cm和地下2cm、4cm处，并距离气象塔2m的正南方；土壤水分传感器分别埋设在地下2cm、4cm处，在距离气象塔2m的正南方；土壤热流板（3块）依次埋设在地下6cm处，并距离气象塔2m的正南方。
观测项目有：四分量辐射（DR、UR、DLR_Cor、ULR_Cor、Rn）(单位：瓦/平方米)、地表辐射温度（IRT_1、IRT_2）(单位：摄氏度)、土壤热通量（Gs_1、Gs_2、Gs_3）(单位：瓦/平方米)、土壤温度（Ts_0cm、Ts_2cm、Ts_4cm）(单位：摄氏度)、土壤水分（Ms_2cm、Ms_4cm）(单位：体积含水量，百分比)、向上和向下光合有效辐射（PAR_up、PAR_down）(单位：微摩尔/平方米秒)。
观测数据的处理与质量控制：（1）确保每天144个数据（每10min），若出现数据的缺失，则由-6999标示；由于数据存储问题，2015.9.25-10.01间数据缺失；土壤热通量3和0cm土壤温度由于传感器问题，在6.14-6.22间数据缺失；0cm土壤温度由于传感器问题，在6.09-9.22间偶尔出现问题；土壤热通量2由于传感器问题，在10.17-10.29间数据缺失；（2）剔除有重复记录的时刻；（3）删除了明显超出物理意义或超出仪器量程的数据；（4）数据中以红字标示的部分为有疑问的数据；（5）日期和时间的格式统一，并且日期、时间在同一列。如，时间为：2015-9-10 10:30；（6）命名规则为：AWS+站点名称。
水文气象网或站点信息请参考Li et al. (2013)，观测数据处理请参考Liu et al. (2011)。

This dataset contains meteorological element observation data from the downstream farmland station of the Heihe River Hydrometeorological Observation Network, covering the period from January 1, 2015 to October 29, 2015. The station is located at Sidaoqiao, Dalaihubu Town, Ejina Banner, Inner Mongolia, with the underlying surface being melon farmland. The coordinates of the observation site are 101.1338°E, 42.0048°N, and the elevation is 875 m.

The four-component radiometer is installed at 6 m above the ground, facing due south; two infrared temperature sensors are installed at 6 m above the ground, facing due south with their probes pointing vertically downward; two photosynthetically active radiation (PAR) sensors are installed at 6 m above the ground, facing due south, with one probe pointing vertically upward and the other vertically downward; soil temperature probes are buried at 0 cm (surface) and 2 cm, 4 cm underground, 2 m south of the meteorological tower; soil moisture sensors are buried at 2 cm and 4 cm underground, 2 m south of the meteorological tower; three soil heat flux plates are sequentially buried at 6 cm underground, 2 m south of the meteorological tower.

Observation items include: four-component radiation (DR, UR, DLR_Cor, ULR_Cor, Rn) (unit: Watt per square meter, W·m⁻²), surface radiation temperature (IRT_1, IRT_2) (unit: degree Celsius, °C), soil heat flux (Gs_1, Gs_2, Gs_3) (unit: W·m⁻²), soil temperature (Ts_0cm, Ts_2cm, Ts_4cm) (unit: °C), soil moisture (Ms_2cm, Ms_4cm) (unit: volumetric water content, percentage), upward and downward photosynthetically active radiation (PAR_up, PAR_down) (unit: micromole per square meter per second, μmol·m⁻²·s⁻¹).

Data processing and quality control of the observation data: (1) Ensure 144 data records per day (sampling interval: 10 minutes). Missing data are marked with -6999; data from September 25 to October 1, 2015 are missing due to data storage issues; data of soil heat flux 3 and 0 cm soil temperature are missing from June 14 to June 22, 2015 due to sensor malfunctions; 0 cm soil temperature occasionally had issues from June 9 to September 22, 2015 due to sensor problems; data of soil heat flux 2 are missing from October 17 to October 29, 2015 due to sensor malfunctions; (2) Remove duplicate records at the same time stamp; (3) Delete data that obviously exceed physical limits or instrument measurement ranges; (4) Data marked in red are questionable; (5) The format of date and time is unified, and date and time are stored in the same column. Example: 2015-9-10 10:30; (6) The naming convention is: AWS + station name.

For information on the hydrometeorological network and the station, please refer to Li et al. (2013); for observation data processing, please refer to Liu et al. (2011).