Abstract: Diffuse radiation is a main component of solar radiation, which dynamic change has an important effect on ecosystem carbon cycle. In 2012, an SPN1 pyranometer (Delta-T Devices Ltd., UK) was installed in the comprehensive meteorological observation field in Qianyanzhou Ecological Research Station to measure the diffuse radiation. For the missing diffuse radiation data, the data measured by the CMP11 pyranometer (Kipp & Zonen, Netherlands) attached with a shadow ring were replaced. If the diffuse radiation data of CMP11 pyranometer were also missing, the Reindl model which has been verified in Qianyanzhou area was used for calculation. The accuracy of this dataset is 30 minutes, and the time range is from 2012 to 2019, so as to provide basic data for related ecological, environmental and meteorological studies.
Keywords: Qianyanzhou; diffuse radiation; global radiation; clearness index