黑河生态水文遥感试验：水文气象观测网数据集（胡杨林站自动气象站-2015）

该数据集包含了2015年1月1日至2015年12月31日黑河水文气象观测网下游胡杨林站气象要素观测数据。站点位于内蒙古额济纳旗达来呼布镇四道桥，下垫面是胡杨林和柽柳。观测点的经纬度是101.1239E, 41.9932N，海拔876m。空气温度、相对湿度传感器架设在28m处，朝向正北；风速传感器架设在28m，朝向正北；四分量辐射仪安装在24m处，朝向正南；两个红外温度计安装在24m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24m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，在距离气象塔2m的正南方；土壤水分传感器埋设在地下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，在距离气象塔2m的正南方。
观测项目有：空气温湿度（Ta_28m、RH_28m）(单位：摄氏度、百分比)、风速（WS_28m）(单位：米/秒)、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)、向上与向下光合有效辐射（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；由于仪器调整，在2015.4.22-4.27之间数据缺失；土壤热通量3由于传感器的问题，在6.19-9.05之间数据缺失；（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 Populus euphratica Forest Station (Huyanglin Station) in the lower reaches of the Heihe River Hydrological and Meteorological Observation Network, covering the period from January 1, 2015 to December 31, 2015. The station is located in Sidaoqiao, Dalaihubu Town, Ejina Banner, Inner Mongolia, with its underlying surface covered by Populus euphratica and Tamarix. The geographic coordinates of the observation site are 101.1239°E, 41.9932°N, and the elevation is 876 m.
Air temperature and relative humidity sensors are installed at 28 m above the ground, facing true north; wind speed sensors are also installed at 28 m, facing true north. Four-component radiometers are installed at 24 m, facing true south. Two infrared thermometers are installed at 24 m, facing true south, with their probes pointing vertically downward. Two photosynthetically active radiation (PAR) sensors are installed at 24 m, facing true south, with one probe pointing vertically upward and the other vertically downward. Soil temperature probes are buried at 0 cm (surface), 2 cm and 4 cm below the ground surface, 2 m directly south of the meteorological tower. Soil moisture sensors are buried at 2 cm and 4 cm below the ground surface, 2 m directly south of the meteorological tower. Three soil heat flux plates are sequentially buried at 6 cm below the ground surface, 2 m directly south of the meteorological tower.
The observed meteorological elements include: air temperature and relative humidity (Ta_28m, RH_28m; units: °C, %), wind speed (WS_28m; unit: m/s), four-component radiation (DR, UR, DLR_Cor, ULR_Cor, Rn; unit: W/m²), surface radiation temperature (IRT_1, IRT_2; unit: °C), soil heat flux (Gs_1, Gs_2, Gs_3; unit: W/m²), soil temperature (Ts_0cm, Ts_2cm, Ts_4cm; unit: °C), soil moisture (Ms_2cm, Ms_4cm; unit: volumetric water content, %), and upward and downward photosynthetically active radiation (PAR_up, PAR_down; unit: μmol/(m²·s)).
Data processing and quality control procedures: (1) Ensure that there are 144 records per day (one record every 10 minutes). Missing data is marked with -6999. Data was missing between April 22 and April 27, 2015 due to instrument adjustment. Data for soil heat flux plate 3 (Gs_3) was missing between June 19 and September 5, 2015 due to sensor issues. (2) Remove duplicate records at the same timestamp. (3) Delete data that obviously exceeds physical limits or instrument measurement ranges. (4) Data marked in red font in the dataset indicates questionable records. (5) Unify the format of date and time, with date and time recorded in the same column. For example, the timestamp format is: "2015-09-10 10:30". (6) The naming convention is: AWS + station name, where AWS stands for Automatic Weather Station.
For information on the Heihe River Hydrological and Meteorological Observation Network and this station, please refer to Li et al. (2013). For data processing procedures, please refer to Liu et al. (2011).