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Approaches to partitioning the global UVER irradiance into its direct and diffuse components in Valencia, Spain

Citation

Nunez, M and Utrillas, MP and Martinez-Lozano, JA, Approaches to partitioning the global UVER irradiance into its direct and diffuse components in Valencia, Spain, Journal of Geophysical Research, 117 Article D02204. ISSN 0148-0227 (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 American Geophysical Union

DOI: doi:10.1029/2011JD016087

Abstract

The 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 6.07.7 mWm-2 for direct and diffuse, respectively, with the nonlinear model performing best overall.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Atmospheric Radiation
Objective Division:Environment
Objective Group:Atmosphere and Weather
Objective Field:Atmospheric Processes and Dynamics
Author:Nunez, M (Dr Manuel Nunez)
ID Code:74985
Year Published:2012
Deposited By:Research Division
Deposited On:2011-12-22
Last Modified:2013-07-09
Downloads:218 View Download Statistics

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