DOI: 10.1002/jgrd.503662013
论文题名: Hourly global irradiance from satellite data in Badajoz, Spain: Spatial and temporal dependence
作者: Nunez M. ; Serrano A. ; Cancillo M.L.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 9 起始页码: 3650
结束页码: 3661
语种: 英语
Scopus关键词: Algorithms
; Estimation
; Pixels
; Solar radiation
; Sun
; Global irradiance
; Retrieval algorithms
; Root mean square differences
; Satellite retrieval algorithms
; Spatial and temporal variability
; Spatial variability
; Temporal dependence
; University campus
; Satellites
; algorithm
; Meteosat
; numerical model
; pixel
; radiation balance
; satellite data
; satellite imagery
; spatiotemporal analysis
; Badajoz [Extremadura]
; Extremadura
; Spain
英文摘要: Satellite estimates of solar radiation at the hourly scale depend on the spatial and temporal variability of solar radiation within a region. To examine this effect, a field program was established near Badajoz, Spain (38.88?N, 7.01?W) consisting in deployment of seven pyranometers at or adjoining the Meteosat pixel for the area. A simple semiempirical retrieval approach based on the satellite reflectance was developed using data from one pyranometer station at the University campus and subsequently tested with an independent data set for the same station. The accuracy of the satellite estimate is a strong function of the averaging period and the frequency of satellite scans used. At the hourly scale, best estimates of solar irradiance are obtained with satellite data taken every 5 min, giving a coefficient of determination (R2) of 0.883. Within-pixel spatial variability of measured irradiance is substantial but only for averaging periods less than 1 h. Comparison of surface point measurements with the satellite retrieval algorithm at the 5 min scale are associated with a relative RMS difference of 20.2% out of which 19.5% is due to model-induced uncertainties and 5.2% is due to instrumentation uncertainties involved in the retrieval process. Within-pixel point sampling will lower both the instrument uncertainty and the uncertainty in the retrieval algorithm for averaging periods lower than 1 h. Beyond this time, a single pyranometer is well representative of the overhead cloud structure, reaching root mean square difference values of 14% at the hourly scale. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63436
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Geography and Environmental Studies, University of Tasmania, Hobart, TAS, Australia; Department of Physics, University of Extremadura, 06006 Badajoz, Spain
Recommended Citation:
Nunez M.,Serrano A.,Cancillo M.L.. Hourly global irradiance from satellite data in Badajoz, Spain: Spatial and temporal dependence[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(9)