文献类型：期刊文献

英文题名：Estimation of half-hourly diffuse solar radiation over a mixed plantation in north China

作者：Liu, Peirong[1] Tong, Xiaojuan[1] Zhang, Jinsong[2] Meng, Ping[2] Li, Jun[3] Zhang, Jingru[1]

第一作者：Liu, Peirong

通信作者：Tong, XJ[1];Zhang, JS[2]

机构：[1]Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Beijing 100091, Peoples R China;[3]Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China

年份：2020

卷号：149

起止页码：1360-1369

外文期刊名：RENEWABLE ENERGY

收录：;EI(收录号：20194807748085);Scopus(收录号：2-s2.0-85075473774);WOS:【SCI-EXPANDED(收录号:WOS:000517856500116)】；

基金：This study was sponsored by the National Natural Science Foundation of China (31570617; 31872703) and the Central Public-interest Scientific Institution Basal Research Fund (CAFYBB2017ZX002-1).

语种：英文

外文关键词：Global solar radiation; Diffuse fraction; Clearness index; Diffuse solar radiation model

摘要：Diffuse solar radiation plays important role in carbon exchange between forest ecosystems and the atmosphere. Based on a 2-year (2016-2017) dataset of global and diffuse solar radiation, the annual mean diffuse fraction (the proportion of diffuse solar radiation to global solar radiation, DF) was approximately 0.45 over the plantation canopy. A proposed model (BRL-1), including six predictors (half-hourly clearness index CI, solar elevation angle, apparent solar time, daily CI, a persistence of global solar radiation and relative humidity), was developed using the ground-based measurements data of 2016. The DF values estimated by the proposed model were in good agreement with the measured ones. The values of the coefficient of determination (R-2), the root mean squared error (RMSE), the mean bias error (MBE) and the t(stat) for the proposed model were 0.82, 0.12, 0.002 and 1.16, respectively, lower than the results derived from other models. Therefore, the performance of the proposed model estimating half-hourly DF was better than the other models. Moreover, half-hourly diffuse solar radiation in cloudy skies estimated by the proposed model was more consistent with the measured one than that under clear skies. This study aims at helping us understand the change of diffuse solar radiation with clouds. (C) 2019 Elsevier Ltd. All rights reserved.