74985 - Approaches to partitioning the global UVER irradiance into its diffuse and direct components in Valencia, Spain.pdf (1.17 MB)
Download fileApproaches to partitioning the global UVER irradiance into its direct and diffuse components in Valencia, Spain
journal contribution
posted on 2023-05-17, 09:43 authored by Manuel NunezManuel Nunez, Utrillas, MP, Martinez-Lozano, JAThe paper explores methods of partitioning the hourly average UV erythemal flux into its direct and diffuse components for Valencia, Spain. It is shown that the cloud modification factor, the ratio of measured to cloudless erythemal flux relates linearly to the fraction of the measured irradiance that is diffuse. This relationship was developed further into two simple models- a linear and nonlinear one. The models are characterized by an effective cloud cover to partition the global erythemal flux. The diffuse fraction increases linearly with cloud cover in the linear model, but exponentially in the nonlinear one. The models may be used to partition the direct and diffuse irradiance with RMS errors values ranging from 5.7 to 6.8 mWm-2 and 6.0-7.7 mWm-2 for direct and diffuse, respectively, with the nonlinear model performing best overall.
History
Publication title
Journal of Geophysical ResearchVolume
117Article number
D02204Number
D02204Pagination
1-12ISSN
0148-0227Department/School
School of Geography, Planning and Spatial SciencesPublisher
Amer Geophysical UnionPlace of publication
2000 Florida Ave Nw, Washington, USA, Dc, 20009Rights statement
Copyright 2012 American Geophysical UnionRepository Status
- Open