Automated multifilter rotating shadow-band radiometer: an instrument for optical depth and radiation measurements

Harrison, L.; Michalsky, Joseph; Berndt, J.

doi:10.1364/ao.33.005118

Cited by 432 publications

(287 citation statements)

References 8 publications

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“…A detailed description of the operation principles of the MFR can be found in Harrison et al (1994a), and a considerable number of publications have suggested various algorithms for the retrieval of aerosol optical depths from measurements of the direct solar irradiance (e.g. Bruegge at al., 1992;Michalsky et al, 2001;Alexandrov et al, 2002a).…”

Section: Methodsmentioning

confidence: 99%

Climatological aspects of aerosol optical properties in Northern Greece

et al. 2003

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Abstract.Measurements of aerosol optical properties (aerosol optical depth, scattering and backscattering coefficients) have been conducted at two groundbased sites in Northern Greece, Ouranoupolis (40 • 23 N, 23 • 57 E, 170 m a.s.l.) and Thessaloniki (40 • 38 N, 22 • 57 E, 80 m a.s.l.), between 1999 and 2002. The frequency distributions of the observed parameters have revealed the presence of individual modes of high and low values, indicating the influence from different sources. At both sites, the mean aerosol optical depth at 500 nm was 0.23. Values increase considerably during summer when they remain persistently between 0.3 and 0.5, going up to 0.7-0.8 during specific cases. The mean value of 65±40 Mm −1 of the particle scattering coefficient at 550 nm reflects the impact of continental pollution in the regional boundary layer. Trajectory analysis has shown that higher values of aerosol optical depth and the scattering coefficient are found in the east sector (former Soviet Union countries, eastern Balkan countries), whereas cleaner conditions are found for the NW direction. The influence of Sahara dust events is clearly reflected in the Angström exponents. About 45-60% of the observed diurnal variation of the optical properties was attributed to the growth of aerosols with humidity, while the rest of the variability is in phase with the evolution of the sea-breeze cell. The contribution of local pollution is estimated to contribute 35±10% to the average aerosol optical depth at the Thessaloniki site during summer. Finally, the aerosol scale height (aerosol optical depth divided by scattering coefficient) was found to be related to the height of the boundary layer with values between 0.5-1 km during winter and up to 2.5-3 km during summer.

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Section: Methodsmentioning

confidence: 99%

Climatological aspects of aerosol optical properties in Northern Greece

et al. 2003

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“…Particles in the troposphere scatter solar radiation, trap greenhouse thermal radiation, alter the amount of light reflected by the Earth, and increase the stability and brightness of the clouds. In addition, atmospheric aerosols contribute to acid rain and visibility impairment (19).…”

Section: Box 1 Urban Airmentioning

confidence: 99%

Peer Reviewed: Urban Air: Real Samples for Undergraduate Analytical Chemistry.

Hope¹,

Johnson²

2000

Anal. Chem.

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“…www.ijacsa.thesai.org It is also applied to measurement data of Multi-Filter Rotating Shadow Band Radiometer (MFRSR) [14] and is trying to use it for atmospheric correction [15]. Furthermore, accuracy comparison with regular LPM has also been done, proving that the precision according to (7) is higher [9].…”

Section: A Theoretical Backgroundmentioning

confidence: 99%

Improved Langley and Ratio Langley Methods for Improving Sky-Radiometer Accuracy

Arai¹

2018

ijacsa

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Abstract-Improved Langley Method (ILM) is proposed to improve the calibration accuracy of the sky-radiometer. The ILM uses that the calibration coefficients of other arbitrary wavelengths can be presumed from the calibration coefficients in a certain reference wave length, and improves the calibration accuracy of a full wave length region by Ratio Langley Method (RLM) in long wavelength paying attention to calibration accuracy being good comparatively was proposed. Specifically, the calibration coefficient of other wavelengths was presumed by the RLM from the calibration factor by ILM in 0.87 micrometer. The numerical simulation based on measured data of solar direct and aureole when the calibration error of the proposed method was evaluated about the case where ±3% and ±5% of measurement error is superimposed on the measurement data solar direct and aureole, the maximum with error was 0.0014 and 0.0428, and they of ILM were 0.011 and 0.0489. Therefore, the proposed calibration method is robust for a measurement error compared with ILM, and was understood that highly precise calibration is possible over full wavelength. When the standard deviation of a calibration coefficients estimated the accuracy of the proposed calibration method based on the measured data of the sky-radiometer for 15 days which fits calibration among the measured data for four years or more, it was 0.02016, and since it was smaller than the standard deviation 0.03858 of the calibration coefficients by ILM, the predominance of the proposed calibration method has been confirmed.

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Automated multifilter rotating shadow-band radiometer: an instrument for optical depth and radiation measurements

Cited by 432 publications

References 8 publications

Climatological aspects of aerosol optical properties in Northern Greece

Climatological aspects of aerosol optical properties in Northern Greece

Peer Reviewed: Urban Air: Real Samples for Undergraduate Analytical Chemistry.

Improved Langley and Ratio Langley Methods for Improving Sky-Radiometer Accuracy

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