Columnar aerosol properties in a Northeastern Atlantic site (Plymouth, United Kingdom) by means of ground based skyradiometer data during years 2000–2008

Estellés, V.; Smyth, Tim; Campanelli, Monica

doi:10.1016/j.atmosenv.2012.07.024

Cited by 11 publications

(16 citation statements)

References 23 publications

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“…In V4.2, the data are rejected if the value of σ obs is larger than 0.2, but the threshold is set to 0.07 in V5.0. There are some other differences between V4.2 and V5.0 on the issue of quality control of observation data (Hashimoto et al, 2012).…”

Section: Inversion Methodsmentioning

confidence: 99%

“…The cloud screening method in V4.2 relies heavily on the global flux test and needs global irradiance data, but almost all SKYNET sites do not have solar irradiance observations. Furthermore, cirrus contamination data are difficult to remove as cloud-affected data (Hashimoto et al, 2012).…”

Section: Inversion Methodsmentioning

confidence: 99%

“…where C v is a threshold coefficient to be determined for optimum rejection of cirrus contamination; v(r) is vertically integrated aerosol SDF as a function of particle radius, r. Based on data analysis at the Pune and Beijing sites (Hashimoto et al, 2012), C v is set to 2 in V5.0 to reject most cirrus contamination cases and retain dust cases. It would be useful to re-evaluate the C v value after more cirrus contamination data and dust event data are collected.…”

Section: Inversion Methodsmentioning

confidence: 99%

“…The aerosol retrievals derived from the SKYRAD.pack version 4.2 algorithm have been used to investigate the regional and seasonal characteristics of aerosols for climate and environmental studies and to validate satellite remote sensing results (e.g., Kim et al, 2004;Che et al, 2008Che et al, , 2018Campanelli et al, 2010;Estellés et al, 2012a;. Recently, a new SKYRAD.pack version (V5.0) was proposed to improve SSA retrievals (Hashimoto et al, 2012). There are a few applications of SKYRAD V5.0; for example, it has been preliminarily used to retrieve aerosol optical properties over Beijing, China (Che et al, 2014).…”

mentioning

confidence: 99%

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Intercomparison between the aerosol optical properties retrieved by different inversion methods from SKYNET sky radiometer observations over Qionghai and Yucheng in China

et al. 2020

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Abstract. This study analyzed the aerosol optical properties derived by SKYRAD.pack versions 5.0 and 4.2 (referred to as V5.0 and V4.2) using the radiometer measurements over Qionghai and Yucheng in China, two new sites of the sky radiometer network (SKYNET). As V5.0 uses an a priori size distribution function (SDF) of a bimodal log-normal function, the volume size distribution retrieved by V5.0 presented bimodal patterns with a 0.1–0.2 µm fine particle mode and a 3.0–6.0 µm coarse particle mode both over Qionghai and Yucheng. The differences in the volume size distributions between the two versions were very large for the coarse mode with a radius of over 5 µm. The single scattering albedos (SSAs) by V5.0 correlated with SSAs by V4.2 with R=0.88, 0.87, 0.90, 0.88, and 0.92 at wavelengths of 400, 500, 670, 870, and 1020 nm over Qionghai, respectively. The correlation coefficients were around 0.95, 0.95, 0.96, 0.94, and 0.91 at the five channels in Yucheng. An error of ±5 % for the solid view angle (SVA) introduced about ±2 % differences in retrieved SSA values both by V4.2 and V5.0. An error of ±50 % for ground surface albedo (Ag) caused about 1 % averaged differences in retrieved SSA values by the two versions. With the atmospheric pressure (PRS) increased by 1 %, 2 %, 3 %, and 4 %, the averaged changes in SSAs did not exceed 0.8 % both by V4.2 and V5.0. The SSA differences at 500 nm between the two versions decreased, while aerosol optical depths (AODs) increased over both sites. The seasonal variability of the aerosol properties over Qionghai and Yucheng was investigated based on SKYRAD.pack V5.0. The seasonal averaged AOD over Qionghai had higher values in spring, winter, and autumn and lower values in summer. The AOD averages were commonly higher in summer and spring than in winter and autumn in Yucheng. The lowest seasonal averaged SSAs were both observed in winter at the two sites. The fraction of the fine aerosol particles was much smaller in summer than in other seasons over Qionghai; the volume fraction of the coarse-mode particle in Yucheng had much larger values compared to the fine-mode particle in all seasons. The validation results provide valuable references for continued improvement of the retrieval algorithms of SKYNET and other aerosol observational networks.

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Section: Inversion Methodsmentioning

confidence: 99%

Section: Inversion Methodsmentioning

confidence: 99%

Section: Inversion Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Intercomparison between the aerosol optical properties retrieved by different inversion methods from SKYNET sky radiometer observations over Qionghai and Yucheng in China

et al. 2020

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“…The analysis of the 500 nm channel was chosen because it was widely quoted in sun photometric and remote sensing applications and generally representative of visible band wavelengths (Estellés et al, 2012b). Four seasons were considered in this paper (i.e., spring (March-May), summer (June-August), autumn (September-November), and winter (December-February)) to investigate the seasonal variations of the aerosol optical properties over Qionghai and Yucheng based on SKYRAD.pack V5.0.…”

Section: Skyradpack V50mentioning

confidence: 99%

Inter-comparison between the Aerosol Optical Properties Retrieved by Different Inversion Methods from SKYNET Sky Radiometer Observations over Qionghai and Yucheng in China

Zhe¹,

Duan²,

Che³

et al. 2019

Preprint

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Abstract. This study analyzed the aerosol optical properties derived by SKYRAD.pack versions 5.0 and 4.2 using the radiometer measurements over Qionghai and Yucheng in China, two new sites of the sky radiometer network (SKYNET). The volume size distribution retrieved by V5.0 presented bimodal patterns with a 0.1–0.2 μm fine particle mode and a 5–6 μm coarse particle mode both over Qionghai and Yucheng. The differences of the volume size distributions between the two versions were very large for the coarse mode with a radius of over 5 μm. The mean values of single scattering albedo (SSA) at 500 nm retrieved from V5.0 were approximately 0.02 lower, but 0.03 higher than those from V4.2 in Qionghai and Yucheng, respectively. The average imaginary part of the complex refractive index (mi) retrieved from V5.0 at all wavelengths was systemically higher than those by V4.2 over Qionghai. Moreover, the differences between the real parts of the complex refractive index (mr) obtained using the two versions were within 4.25 % both at Yucheng and Qionghai. The seasonal variability of the aerosol properties over Qionghai and Yucheng were investigated based on SKYRAD.pack V5.0. The seasonal average SSA during the winter was larger than those in other seasons in Yucheng, while the lowest SSA values occurred in winter over Qionghai. Meanwhile, the mr showed a minimum in winter over both sites. The results can provide validation data in China for SKYNET to continue improving the data-processing and inversion method. The results provide valuable references for continued improvement of the retrieval algorithms of SKYNET and other aerosol observational networks.

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Temporal and spatial trends in aerosols near the English Channel – An air quality success story?

Yang

Buxmann

Delbarre

et al. 2020

Atmospheric Environment: X

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Columnar aerosol properties in a Northeastern Atlantic site (Plymouth, United Kingdom) by means of ground based skyradiometer data during years 2000–2008

Cited by 11 publications

References 23 publications

Intercomparison between the aerosol optical properties retrieved by different inversion methods from SKYNET sky radiometer observations over Qionghai and Yucheng in China

Intercomparison between the aerosol optical properties retrieved by different inversion methods from SKYNET sky radiometer observations over Qionghai and Yucheng in China

Inter-comparison between the Aerosol Optical Properties Retrieved by Different Inversion Methods from SKYNET Sky Radiometer Observations over Qionghai and Yucheng in China

Temporal and spatial trends in aerosols near the English Channel – An air quality success story?

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