Further developments in closure experiments for surface diffuse irradiance under cloud-free skies at a continental site

2004 ◽  
Vol 31 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Rangasayi N. Halthore ◽  
Mark A. Miller ◽  
John A. Ogren ◽  
Patrick J. Sheridan ◽  
Donald W. Slater ◽  
...  
Keyword(s):  
Diffuse Irradiance

scholarly journals Diffuse irradiance on tilted planes in urban environments: Evaluation of models modified with sky and circumsolar view factors

2021 ◽  
Vol 180 ◽  
pp. 1194-1209
Author(s):  
Ignacio García ◽  
Marian de Blas ◽  
Begoña Hernández ◽  
Carlos Sáenz ◽  
José Luis Torres
Keyword(s):  
Urban Environments ◽  
Diffuse Irradiance ◽  
View Factors

scholarly journals On shadowband correction methods for diffuse irradiance measurements

Solar Energy ◽  
1995 ◽  
Vol 54 (2) ◽  
pp. 105-114 ◽  
Author(s):  
F.J. Batlles ◽  
F.J. Olmo ◽  
L. Alados-Arboledas
Keyword(s):  
Diffuse Irradiance

scholarly journals A new simplified version of the perez diffuse irradiance model for tilted surfaces

Solar Energy ◽  
1987 ◽  
Vol 39 (3) ◽  
pp. 221-231 ◽  
Author(s):  
Richard Perez ◽  
Robert Seals ◽  
Pierre Ineichen ◽  
Ronald Stewart ◽  
David Menicucci
Keyword(s):  
Diffuse Irradiance

Accounting For Diffuse Irradiance On Reference Reflectance Panels

1988 ◽  
Author(s):  
Ray D. Jackson ◽  
Philip N. Slater ◽  
M.Susan Moran
Keyword(s):  
Diffuse Irradiance

scholarly journals Retrieval of Key Aerosol Optical Parameters from Spectral Direct and Diffuse Irradiances Observed by a Radiometer with Nonideal Cosine Response Characteristic

2012 ◽  
Vol 29 (5) ◽  
pp. 683-696 ◽  
Author(s):  
Pradeep Khatri ◽  
Tamio Takamura ◽  
Akihiro Yamazaki ◽  
Yutaka Kondo
Keyword(s):  
Direct Effect ◽  
Radiative Forcing ◽  
Response Characteristic ◽  
Single Scattering ◽  
Optical Parameters ◽  
Aerosol Radiative Forcing ◽  
Aerosol Direct Effect ◽  
Diffuse Irradiance ◽  
Isotropic Distribution ◽  
Sky Radiance

Abstract The spectral direct and diffuse irradiances observed by a radiometer with a horizontal surface detector have been frequently used to study aerosol optical parameters, such as aerosol optical thickness (τaer) and single scattering albedo (ω). Such radiometers more or less lack an ideal cosine response. Generally, either the cosine error of observed diffuse irradiance was corrected by assuming an isotropic distribution of sky radiance or it was neglected in the past studies. This study presents an algorithm to retrieve τaer and ω from direct and diffuse irradiances observed by a radiometer with a nonideal cosine response characteristic by taking into account the cosine errors of observed irradiances in detail. The proposed algorithm considers the anisotropic distribution of sky radiance while correcting the cosine error of observed diffuse irradiance. This algorithm can also be used to calculate the cosine error correction factor of diffuse irradiance. The results show that the aerosol optical parameters and the aerosol direct effect (aerosol radiative forcing and the heating rate) can be heavily affected by the cosine errors of observed direct and diffuse irradiances. The study further shows that assuming the isotropic distribution of sky radiance while correcting the cosine error of observed diffuse irradiance can affect the retrieved ω at small and large solar zenith angles; thus, the estimated aerosol direct effect can be quantitatively affected. Because of the cosine errors, this study found the actual values of diffuse irradiances at different wavelengths were underestimated by around 5%–11%.

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