Assessment of four shadow band correction models using beam normal irradiance data from the United Kingdom and Israel

López, Gabriel; Muneer, Tariq; Claywell, Randall

doi:10.1016/j.enconman.2003.11.001

Cited by 23 publications

(10 citation statements)

References 11 publications

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“…Data from the CM3 under the shadowband were adjusted to represent all-sky diffuse radiation using the method of Muneer and Zhang (2002), reported as the most accurate of four commonly used algorithms when assessed using data from Spain (Lopez et al, 2004b), Israel and the UK (Lopez et al, 2004a). These data correlated well with the BF3 diffuse measurement (r = 0.99), but the BF3 overestimated by 10.7% and was therefore corrected by dividing by 1.107 before modelling.…”

Section: Appendix C Sensor Calibrationmentioning

confidence: 99%

Data-driven modelling of shortwave radiation transfer to snow through boreal birch and conifer canopies

et al. 2013

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Hydrological and land surface models require simple but accurate methods to predict the solar radiation transmitted through vegetation to snow, backed up by direct comparisons to data. Twenty shortwave pyranometers were deployed in forest plots of varying canopy structures and densities in sparse birch forest near Abisko, Sweden, in spring 2011 and mixed conifer forest near Sodankylä, Finland, in spring 2012. Above‐canopy global and diffuse shortwave irradiances were also measured. These data were used to test a model that uses hemispherical photographs to explicitly estimate both diffuse radiation and direct beam transmission, as well as two models that apply bulk canopy parameters and versions of Beers Law. All three models predict canopy shortwave transmission similarly well for leafless birch forest, but for conifers, the bulk methods perform poorly. In addition, an existing model of multiple reflections between canopy and snow was found to be suitable for birch, but not conifers. A new bulk approach based on empirical relationships with hemisphere‐averaged sky view fraction showed improved performance for both sites; this suggests benefits of avoiding the use of plant area index calculated from optical methods, which can introduce errors. Furthermore, tests using common empirical diffuse radiation models were shown to underestimate shortwave transmission by up to 7% relative to using the data, suggesting that new diffuse models are required for high latitudes. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Appendix C Sensor Calibrationmentioning

confidence: 99%

Data-driven modelling of shortwave radiation transfer to snow through boreal birch and conifer canopies

et al. 2013

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“…All parameters were measured concurrently every 30 s and averaged over the minute. Measurements were subjected to quality control as described in López et al [1].…”

Section: Methodsmentioning

confidence: 99%

“…Diffuse irradiance readings were corrected using four shadowband correction models namely the Drummond [2], LeBaron [3], Battles [4], and Muneer and Zhang [1,5] as described by Kudish and Evseev [6]. Drummond's model assumes isotropic distribution of diffuse radiation and it's a purely geometrical correction factor, given by the equations:…”

Section: Methodsmentioning

confidence: 99%

Use of shadowband correction models for predicting direct solar irradiance

Kotti

Argiriou

Kazantzidis³

2013

AIP Conference Proceedings

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Abstract. Direct solar irradiance can be calculated from global and diffuse horizontal irradiance measurements. However diffuse irradiance values need to be corrected because the pyranometer's shadowband does obstruct not only the solar disk but also a larger part of the sky. This correction is necessary in order to calculate more accurately direct irradiance when not directly measured. In this work we study the impact of these corrections on calculated normal direct irradiance under different sky conditions.

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“…When the band was attached perpendicular to the supporting arms it was parallel to the equatorial plane and, in successive adjustments over the length of the year it moved according to the axis parallel to the polar axis [López et al, 2004]. The shadowband was designed following the guidelines of Horowitz [1969], and could be built from low-cost materials.…”

Section: Instrumentation and Measurement Setupmentioning

confidence: 99%

Diffuse UV erythemal radiation experimental values

Utrillas¹,

Marı́n²,

Esteve³

et al. 2007

J. Geophys. Res.

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[1] Measurements of diffuse UV erythemal radiation (UVER) using a shadowband have been corrected using the models proposed by Drummond (1956), LeBaron et al. (1990), andBatlles et al. (1995). Two different methods were used to validate these models: intercomparison with an Optronic OL754 spectroradiometer and comparison with the values simulated by two radiative transfer codes, SMARTS and SBDART. For this comparison only clear days have been used. The corrected experimental values were analyzed in order to study the average values of the diffuse UVER fraction in relation to the clearness index k t . These varied between 62%, for k t close to 0.8, and 93% for k t of 0.2-0.3. Finally, a study of the monthly average and extreme values of the UV Index for diffuse radiation is presented, showing a maximum value of 6 in June.

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Assessment of four shadow band correction models using beam normal irradiance data from the United Kingdom and Israel

Cited by 23 publications

References 11 publications

Data-driven modelling of shortwave radiation transfer to snow through boreal birch and conifer canopies

Data-driven modelling of shortwave radiation transfer to snow through boreal birch and conifer canopies

Use of shadowband correction models for predicting direct solar irradiance

Diffuse UV erythemal radiation experimental values

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