Hubbard Brook Experimental Forest (USDA Forest Service): Daily Solar Radiation Measurements, 1959 - present

Daily solar radiation has been measured at Hubbard Brook Experimental Forest Headquarters since 1959, using several different sensors. Radiation was recorded continuously first by a Belfort pyranograph and later by a Weather Measure pyranograph. The pyranograph has been at its current Headquarter location since 1960 and before that at weather station 1, near weir 1. With the installation of the automatic weather station in 1981, a LiCor pyranometer was collocated with the pyranograph and used as the primary radiation sensor. The pyranograph operated until 2000 as a back up. Solar radiation is now sampled by the LiCor sensor once per minute and hourly and daily means are calculated by a Campbell CR-21 Data logger and reported in Mj/m2. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.自1959年起，科研人员便采用多类不同传感器，在哈伯德布鲁克实验林场总部（Hubbard Brook Experimental Forest Headquarters）开展逐日太阳辐射观测。观测初期，使用贝尔福特（Belfort）日射记录仪（pyranograph）进行连续辐射记录，后续更换为Weather Measure品牌日射记录仪。该日射记录仪自1960年起部署于当前总部点位，1960年之前则设于紧邻1号堰（weir 1）的1号气象站。1981年自动气象站建成投用后，LiCor公司的总辐射表（pyranometer）与原日射记录仪并置部署，被作为核心辐射观测传感器；原日射记录仪则作为备份设备持续运行至2000年。目前，太阳辐射数据由LiCor传感器以每分钟1次的频率采样，Campbell CR-21型数据记录仪（Campbell CR-21 Data logger）会计算逐时与逐日平均辐射量，并以Mj/m²为单位上报观测结果。上述数据作为哈伯德布鲁克生态系统研究（Hubbard Brook Ecosystem Study, HBES）的一部分被收集整合。哈伯德布鲁克生态系统研究是依托哈伯德布鲁克实验林场开展的协同研究项目，该林场由美国农业部林务局北方研究站（USDA Forest Service, Northern Research Station）运营维护。