Above-canopy solar irradiance measurements at Hartheim Forest Research Site (DE-Har) from 2015-01-01 to 2015-12-31 [L2]

Quality controlled and gap-filled continuous solar irradiance measurements at 16 m above ground level measured on a boom extending from the tower above the forest canopy at Hartheim Forest Research Site (ICOS Associate Ecosystem Site DE-Har, UFR Code: HARTHM, 7.59814ºE, 47.93391ºN, 201 m) measured using a ventilated pyranometer CM21 (Kipp & Zonen, Delft, Netherlands). The pyranometer was operated on the 30 m tower connected to a C23X data logger. Quality controlled above-canopy solar irradiance data are available and aggregated at 10min, 30min, hourly, daily, monthly and yearly resolution for the year 2015. Values are averages during the periods shown. Solar irradiance in this dataset is equal "global irradiance" or "global hemispherical irrandiance" and does not distinguish between direct and diffuse irradiance. Modeled extraterrestrial irradiance (based on the NOAA General Solar Position Calculations of the NOAA Global Monitoring Division and considering the Earth's elliptical orbit) is provided for comparison, along with the ratio of solar irradiance to extraterrestrial irradiance at 10min, 30min, hourly, daily, monthly and yearly resolution. Extraterrestrial irradiance is average of period show. Number of hours with solar irradiance >5 W/m2 (daylight hours) and > 120 W/m2 (sometimes used as threshold for "sun hours") provided on daily, monthly, and annual scale. Number of days with solar irradiance >5 W/m2 (quality check) and > 120 W/m2 ("sun hours") provided on monthly, and annual scale. Detailed information on gap-filled data is provided. Note: All times are provided in UTC, not local time. For more details read `HARTHM_2015_SolarIrradiance_MetaData.txt`.本数据集包含经质量控制与间隙填充的连续太阳辐射观测数据，观测高度为地面以上16米，布设自哈特海姆森林研究站（国际碳观测系统（Integrated Carbon Observation System, ICOS）联合生态站点DE-Har，UFR代码：HARTHM，东经7.59814°，北纬47.93391°，海拔201米）林冠上方塔架伸出的悬臂上。观测采用通风式总辐射表CM21（荷兰代尔夫特Kipp & Zonen公司生产），该辐射表安装于30米高塔架上，并连接C23X数据记录仪。 本数据集提供2015年经质量控制的林冠上方太阳辐射数据，已聚合为10分钟、30分钟、小时、日、月及年尺度的时间序列，所有数值均为对应时段的平均值。 本数据集所收录的太阳辐射等同于“总辐射”或“半球总辐射”，未区分直接辐射与散射辐射。 为便于对比，本数据集同步提供模拟的地外辐射数据（基于美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）全球监测分部的通用太阳位置计算方法，并考虑地球椭圆轨道），同时提供10分钟、30分钟、小时、日、月及年尺度下太阳辐射与地外辐射的比值。地外辐射数值为对应时段的平均值。 本数据集还提供日、月及年尺度下，太阳辐射大于5瓦/平方米的时数（日照时数）以及大于120瓦/平方米的时数（该阈值常被用作“日照小时数”的判定标准）。 此外，数据集提供月、年尺度下，太阳辐射大于5瓦/平方米的天数（用于质量校验）以及大于120瓦/平方米的天数（即“日照小时数”对应天数）。 本数据集同时提供间隙填充数据的详细说明。 注：所有时间均采用协调世界时（UTC），而非当地时间。 如需获取更多细节，请查阅`HARTHM_2015_SolarIrradiance_MetaData.txt`文件。