An overview of and issues with sky radiometer technology and SKYNET
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An overview of and issues with sky radiometer technology and SKYNET

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An overview of and issues with sky radiometer technology and SKYNET

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dc.contributor.author Nakajima, T.
dc.contributor.author Campanelli, M.
dc.contributor.author Che, Huizheng
dc.contributor.author Estellés Leal, Víctor
dc.contributor.author Irie, Hitoshi
dc.contributor.author Kim, Sang-Woo
dc.contributor.author Kim, Jhoon
dc.contributor.author Liu, Dong
dc.contributor.author Nishizawa, Tomoaki
dc.contributor.author Pandithurai, Govindan
dc.contributor.author Soni, V. Kumar
dc.contributor.author Thana, Boossarasiri
dc.contributor.author Tugjsurn, Nas-Urt
dc.contributor.author Aoki, Kazuma
dc.contributor.author Go, Sujung
dc.contributor.author Hashimoto, Makiko
dc.contributor.author Higurashi, Akiko
dc.contributor.author Kazadzis, Stelios
dc.contributor.author Khatri, P.
dc.contributor.author Kouremeti, Natalia
dc.contributor.author Kudo, Rei
dc.contributor.author Marenco, Franco
dc.contributor.author Momoi, Masahiro
dc.contributor.author Ningombam, Shantikumar S.
dc.contributor.author Ryder, Claire
dc.contributor.author Uchiyama, A.
dc.contributor.author Yamazaki, Akihiro
dc.date.accessioned 2021-03-09T15:07:59Z
dc.date.available 2021-03-09T15:07:59Z
dc.date.issued 2020
dc.identifier.uri https://hdl.handle.net/10550/78215
dc.description.abstract This paper is an overview of the progress in sky radiometer technology and the development of the network called SKYNET. It is found that the technology has produced useful on-site calibration methods, retrieval algorithms, and data analyses from sky radiometer observations of aerosol, cloud, water vapor, and ozone. A formula was proposed for estimating the accuracy of the sky radiometer calibration constant F0 using the improved Langley (IL) method, which was found to be a good approximation to observed monthly mean uncertainty in F0, around 0.5 % to 2.4 % at the Tokyo and Rome sites and smaller values of around 0.3 % to 0.5 % at the mountain sites at Mt. Saraswati and Davos. A new cross IL (XIL) method was also developed to correct an underestimation by the IL method in cases with large aerosol retrieval errors. The root-mean-square difference (RMSD) in aerosol optical thickness (AOT) comparisons with other networks took values of less than 0.02 for λ≥500 nm and a larger value of about 0.03 for shorter wavelengths in city areas and smaller values of less than 0.01 in mountain comparisons. Accuracies of single-scattering albedo (SSA) and size distribution retrievals are affected by the propagation of errors in measurement, calibrations for direct solar and diffuse sky radiation, ground albedo, cloud screening, and the version of the analysis software called the Skyrad pack. SSA values from SKYNET were up to 0.07 larger than those from AERONET, and the major error sources were identified as an underestimation of solid viewing angle (SVA) and cloud contamination. Correction of these known error factors reduced the SSA difference to less than 0.03. Retrievals of other atmospheric constituents by the sky radiometer were also reviewed. Retrieval accuracies were found to be about 0.2 cm for precipitable water vapor amount and 13 DU (Dobson Unit) for column ozone amount. Retrieved cloud optical properties still showed large deviations from validation data, suggesting a need to study the causes of the differences. It is important that these recent studies on improvements presented in the present paper are introduced into the existing operational systems and future systems of the International SKYNET Data Center.
dc.language.iso eng
dc.relation.ispartof Atmospheric Measurement Techniques, 2020, vol. 13, num. 8, p. 4195-4218
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Nakajima, T. Campanelli, M. Che, Huizheng Estellés Leal, Víctor Irie, Hitoshi Kim, Sang-Woo Kim, Jhoon Liu, Dong Nishizawa, Tomoaki Pandithurai, Govindan Soni, V. Kumar Thana, Boossarasiri Tugjsurn, Nas-Urt Aoki, Kazuma Go, Sujung Hashimoto, Makiko Higurashi, Akiko Kazadzis, Stelios Khatri, P. Kouremeti, Natalia Kudo, Rei Marenco, Franco Momoi, Masahiro Ningombam, Shantikumar S. Ryder, Claire Uchiyama, A. Yamazaki, Akihiro 2020 An overview of and issues with sky radiometer technology and SKYNET Atmospheric Measurement Techniques 13 8 4195 4218
dc.subject Atmosfera
dc.subject Aerosols
dc.title An overview of and issues with sky radiometer technology and SKYNET
dc.type info:eu-repo/semantics/article
dc.date.updated 2021-03-09T15:08:00Z
dc.identifier.doi https://doi.org/10.5194/amt-13-4195-2020
dc.identifier.idgrec 143763

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