Above-canopy solar irradiance measurements at Hartheim Forest Research Site (DE-Har) from 2025-01-01 to 2025-12-31 [L2]

Quality controlled and gap-filled continuous solar irradiance measurements at 29.5 m above ground level measured on a 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 CR3000 data logger. The pyranometer was cross-calibrated aganst a newly factory-calibrated system in 2020 and is regularly cleaned and maintained. Quality controlled above-canopy solar irradiance data are available and aggregated at 10min, 30min, hourly, daily, monthly and yearly resolution for the year 2025. 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_2025_SolarIrradiance_MetaData.txt`.本数据集为经质量控制并完成间隙填补的连续太阳辐照度测量数据，采集于哈特海姆森林研究站（ICOS关联生态站DE-Har，UFR代码：HARTHM，东经7.59814°，北纬47.93391°，海拔201米）林冠上方的塔架上，测点距地面高度29.5米，采用通风型总辐射表（pyranometer）CM21（荷兰代尔夫特Kipp & Zonen公司生产）进行测量。该总辐射表安装于30米高的塔架，连接至CR3000数据采集器，并于2020年与全新出厂校准系统完成交叉校准，同时定期开展清洁与维护工作。 本数据集包含经质量控制的林冠上方太阳辐照度数据，已聚合为2025年的10分钟、30分钟、小时、日、月及年分辨率数据，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照度等同于"global irradiance"（全球辐照度）或"global hemispherical irradiance"（半球总辐照度），未区分直接辐照度与散射辐照度。 为便于对比分析，本数据集同时提供模拟的地外太阳辐照度数据（基于美国国家海洋和大气管理局（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），以及10分钟、30分钟、小时、日、月、年分辨率下的太阳辐照度与地外辐照度的比值，地外辐照度数值为对应时段的平均值。 本数据集提供每日、每月及年度尺度下，太阳辐照度大于5 W/m²的时长（日照时长），以及大于120 W/m²的时长（部分场景下用作"sun hours"（日照小时数）阈值）。 同时提供每月及年度尺度下，太阳辐照度大于5 W/m²的天数（用于质量校验），以及大于120 W/m²的天数（即"sun hours"（日照小时数）统计天数）。 本数据集提供间隙填补数据的详细说明。 注意：所有时间均采用协调世界时（UTC），而非当地时间。 如需获取更多详细信息，请查阅`HARTHM_2025_SolarIrradiance_MetaData.txt`文件。