Modeling Solar Radiation at the Earth’s Surface

Data Quality Assessment

The simplest approach to quality assessment of solar radiation data is comparison with physical limits. Are the data within “reasonable” bounds? Another basis for data quality assessment is Eq. (1.1), the “closure” equation between the solar com­ponents. However, given the instrumentation issues addressed above, it is clear that the closure can occur even if large errors are present in any one or all of the three components. This problem is also traceable to the component-summation and even shade-unshade calibration approaches, where unknown bias (type B) errors are em­bedded in the test instrumentation. Another approach to identifying the type-B er­rors and characterizing them under clear-sky conditions has been comparison with modeled clear-sky data. Physical limits, closure, and model comparison approaches will briefly be described in the next subsections.

Modeling Solar Radiation at the Earth’s Surface

Quality Assessment Based Upon Comparison with Models

Many models based on the physics of radiation transfer through the clear atmo­sphere have been developed (Lacis and Hansen 1974; Atwater and Ball 1978; Hoyt 1978; Bird and Hulstrom 1981a, …

Solar Horizontal Diffuse and Beam Irradiation on Clear Days

There exist a number of models to determine the solar horizontal diffuse irradia­tion on a clear day (Kondratyev 1969) but they are complex and have very stringent conditions. Similarly, there …

Foreword

Reading the twenty chapters of this book caused me mixed reactions, though all were positive. My responses were shaped by several factors. Although I have main­tained a “watching brief’ on …

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