Comparison of spectral direct and diffuse solar irradiance measurements and calculations for cloud‐free conditions

Mlawer, E. J.; Brown, P.; Clough, S. A.; Harrison, L.; Michalsky, Joseph; Kiedron, P.; Shippert, Timothy

doi:10.1029/2000gl011498

Cited by 58 publications

(47 citation statements)

References 17 publications

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“…Radiative closure calculations, in which radiative transfer model calculations are compared to irradiance (flux) or radiance measurements, can serve as a testbed to evaluate the specification of atmospheric column properties retrieved from measurements (including surface conditions, water vapor amount, and aerosol and cloud properties), radiative transfer model calculations, and the radiative measurements themselves (e.g., Michalsky et al, 2006;McFarlane and Evans, 2004;Turner et al, 2004;Halthore and Schwartz, 2000;Mlawer et al, 2000). Previously, studies using data from the Atmospheric Radiation Measurement (ARM) Program have performed such comparisons in the longwave spectral region to refine treatment of the longwave water vapor continuum and to improve the specification of the atmospheric water vapor column.…”

Section: Introductionmentioning

confidence: 99%

Development of a high spectral resolution surface albedo product for the ARM Southern Great Plains central facility

et al. 2011

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Abstract. We present a method for identifying dominant surface type and estimating high spectral resolution surface albedo at the Atmospheric Radiation Measurement (ARM) facility at the Southern Great Plains (SGP) site in Oklahoma for use in radiative transfer calculations. Given a set of 6-channel narrowband visible and near-infrared irradiance measurements from upward and downward looking multi-filter radiometers (MFRs), four different surface types (snow-covered, green vegetation, partial vegetation, non-vegetated) can be identified. A normalized difference vegetation index (NDVI) is used to distinguish between vegetated and non-vegetated surfaces, and a scaled NDVI index is used to estimate the percentage of green vegetation in partially vegetated surfaces. Based on libraries of spectral albedo measurements, a piecewise continuous function is developed to estimate the high spectral resolution surface albedo for each surface type given the MFR albedo values as input. For partially vegetated surfaces, the albedo is estimated as a linear combination of the green vegetation and non-vegetated surface albedo values. The estimated albedo values are evaluated through comparison to high spectral resolution albedo measurements taken during several Intensive Observational Periods (IOPs) and through comparison of the integrated spectral albedo values to observed broadband albedo measurements. The estimated spectral albedo values agree well with observations for the visible wavelengths constrained by the MFR measurements, but have larger biases and variability at longer wavelengths. Additional MFR channels at 1100 nm and/or 1600 nm would help constrain the high resolution spectral albedo in the near infrared region.

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Section: Introductionmentioning

confidence: 99%

Development of a high spectral resolution surface albedo product for the ARM Southern Great Plains central facility

et al. 2011

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“…Kopp and Lean, 2011), but there is a lack of systematic research on the intercomparison of those solar spectra mentioned above and the impact on climate model simulations due to the differences in these spectra. Mlawer et al (2000) compared the solar spectral irradiance at the surface determined with their line-by-line model (LBLRTM) using the Neckel-Labs and Kurucz95 spectra with high spectral resolution observations obtained at the Southern Great Plains site of the US Atmospheric Radiation Measurement (ARM) program (Stokes and Schwartz, 1994). Their results suggested that Kurucz95 provides a better modelled irradiance at the surface.…”

Section: Impact Of Solar Spectral Distributionmentioning

confidence: 99%

Evaluation of Solar Spectra and Their Effects on Radiative Transfer and Climate Simulation

Sun¹,

Li²,

Liu³

2012

Solar Power

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“…The data measured by the second-generation instrument with higher-performance 1024 × 256 charge-coupled device (CCD) arrays are used in this work. The data from the first-generation instrument have been used by Mlawer et al (2000) to validate LBLRTM. The data obtained at 1100 local time (solar zenith angle 43.59 • ) on 4 March 2000 were used.…”

Section: Comparison Of Spectral Direct Irradiance Determined By Genlnmentioning

confidence: 99%

Improving transmission calculations for the Edwards–Slingo radiation scheme using a correlated‐k distribution method

Sun

2011

Quart J Royal Meteoro Soc

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A new version of the Edwards-Slingo (ES) radiation scheme is developed using the correlated-k distribution (CKD) method. The work is conducted based on the line-by-line radiative transfer scheme GENLN2. A dataset of new ozone absorption cross-section in the ultraviolet spectrum and new oxygen collisioninduced continuum data have been implemented in both the GENLN2 and new ES schemes. In order to improve the efficiency of the ES scheme, a new technique is proposed in this work to optimize the k distribution and a new method is used to deal with the gaseous overlapping absorption in a spectral band. The accuracy of the scheme is improved by replacing the scaling function used in the ES scheme with a pre-determined look-up table for consideration of the pressure and temperature dependency of the absorption oefficients. The number of spectral bands and number of absorbing species are both increased in the new scheme for better resolution of the spectral variation of absorbing species, aerosols and clouds. However, this does not increase the computational cost. Instead, it is reduced substantially compared with the previous version of the code. The treatment of transmission in the short-wave spectrum is improved by implementing the absorbing species of CH 4 , N 2 O and O 2 collision-induced continuum absorption which are not included in the ES scheme. New O 3 absorption cross-section data in the ultraviolet spectrum measured by the European Space Agency are used to generate the CKD spectral data in the short-wave spectral bands. These data have a temperature dependency and better spectral resolution. The irradiance and heating rate determined by the new scheme are tested against the same variables determined by GENLN2. It has been shown that the new scheme produces results more accurate than the ES scheme. Copyright

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Comparison of spectral direct and diffuse solar irradiance measurements and calculations for cloud‐free conditions

Cited by 58 publications

References 17 publications

Development of a high spectral resolution surface albedo product for the ARM Southern Great Plains central facility

Development of a high spectral resolution surface albedo product for the ARM Southern Great Plains central facility

Evaluation of Solar Spectra and Their Effects on Radiative Transfer and Climate Simulation

Improving transmission calculations for the Edwards–Slingo radiation scheme using a correlated‐k distribution method

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