Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradiance

The Campbell-Stokes sunshine recorder (CSSR) has been one of the most commonly used instruments for measuring sunshine duration (SD) through the burn length of a given CSSR card. Many authors have used SD to obtain information about cloudiness and solar radiation (by using Ångström-Prescott type for...

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Autores: Sánchez Romero, Alejandro, González Gutiérrez, Josep Abel, Calbó Angrill, Josep, Sánchez Lorenzo, Arturo
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:10256/11847
Acceso en línea:http://hdl.handle.net/10256/11847
Access Level:acceso abierto
Palabra clave:Radiació solar
Solar radiation
Imatges digitals -- Processament
Digital images processing
Aerosols
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spelling Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradianceSánchez Romero, AlejandroGonzález Gutiérrez, Josep AbelCalbó Angrill, JosepSánchez Lorenzo, ArturoRadiació solarSolar radiationImatges digitals -- ProcessamentDigital images processingAerosolsThe Campbell-Stokes sunshine recorder (CSSR) has been one of the most commonly used instruments for measuring sunshine duration (SD) through the burn length of a given CSSR card. Many authors have used SD to obtain information about cloudiness and solar radiation (by using Ångström-Prescott type formulas), but the burn width has not been used systematically. In principle, the burn width increases for increasing direct beam irradiance. The aim of this research is to show the relationship between burn width and direct solar irradiance (DSI) and to prove whether this relationship depends on the type of CSSR and burning card. A method of analysis based on image processing of digital scanned images of burned cards is used. With this method, the temporal evolution of the burn width with 1 min resolution can be obtained. From this, SD is easily calculated and compared with the traditional (i.e., visual) determination. The method tends to slightly overestimate SD, but the thresholds that are used in the image processing could be adjusted to obtain an improved estimation. Regarding the burn width, experimental results show that there is a high correlation between two different models of CSSRs, as well as a strong relationship between burn widths and DSI at a high-temporal resolution. Thus, for example, hourly DSI may be estimated from the burn width with higher accuracy than based on burn length (for one of the CSSR, relative root mean squared error is 24 and 30%, respectively; mean bias error is -0.6 and -30.0 W m<sup>-2</sup>, respectively). The method offers a practical way to exploit long-term sets of CSSR cards to create long time series of DSI. Since DSI is affected by atmospheric aerosol content, CSSR records may also become a proxy measurement for turbidity and atmospheric aerosol loadingThis research was supported by the Spanish Ministry of Science and Innovation project NUCLIERSOL (CGL2010-18546). The first author enjoys a grant from the FPU program (FPU AP2010-0917) of the Spanish Ministry of Education. A. Sanchez-Lorenzo was supported by the "Secretaria per a Universitats i Recerca del Departament d'Economia i Coneixement, de la Generalitat de Catalunya i del programa Cofund de les Accions Marie Curie del 7e Programa marc d'R+D de la Unio Europea" (2011 BP-B 00078) and the postdoctoral fellowship JCI-2012-12508. The Negretti & Zambra Campbell-Stokes recorder was provided by the Pyrenean Institute of Ecology (CSIC). We thank Juan Jose Vizcaino Morillas (AEMET) for providing sunshine duration cards of the model Mod.98European Geosciences Union (EGU)Ministerio de Ciencia e Innovación (Espanya)2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10256/11847http://hdl.handle.net/10256/11847Atmospheric Measurement Techniques, 2015, vol. 8, núm. 1, p. 183-194Articles publicats (D-F)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)Inglésinfo:eu-repo/semantics/altIdentifier/doi/10.5194/amt-8-183-2015info:eu-repo/semantics/altIdentifier/issn/1867-1381info:eu-repo/semantics/altIdentifier/eissn/1867-8548info:eu-repo/grantAgreement/MICINN//CGL2010-18546Attribution 3.0 Spainhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:recercat.cat:10256/118472026-05-29T05:05:01Z
dc.title.none.fl_str_mv Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradiance
title Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradiance
spellingShingle Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradiance
Sánchez Romero, Alejandro
Radiació solar
Solar radiation
Imatges digitals -- Processament
Digital images processing
Aerosols
title_short Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradiance
title_full Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradiance
title_fullStr Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradiance
title_full_unstemmed Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradiance
title_sort Using digital image processing to characterize the Campbell-Stokes sunshine recorder and to derive high-temporal resolution direct solar irradiance
dc.creator.none.fl_str_mv Sánchez Romero, Alejandro
González Gutiérrez, Josep Abel
Calbó Angrill, Josep
Sánchez Lorenzo, Arturo
author Sánchez Romero, Alejandro
author_facet Sánchez Romero, Alejandro
González Gutiérrez, Josep Abel
Calbó Angrill, Josep
Sánchez Lorenzo, Arturo
author_role author
author2 González Gutiérrez, Josep Abel
Calbó Angrill, Josep
Sánchez Lorenzo, Arturo
author2_role author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (Espanya)
dc.subject.none.fl_str_mv Radiació solar
Solar radiation
Imatges digitals -- Processament
Digital images processing
Aerosols
topic Radiació solar
Solar radiation
Imatges digitals -- Processament
Digital images processing
Aerosols
description The Campbell-Stokes sunshine recorder (CSSR) has been one of the most commonly used instruments for measuring sunshine duration (SD) through the burn length of a given CSSR card. Many authors have used SD to obtain information about cloudiness and solar radiation (by using Ångström-Prescott type formulas), but the burn width has not been used systematically. In principle, the burn width increases for increasing direct beam irradiance. The aim of this research is to show the relationship between burn width and direct solar irradiance (DSI) and to prove whether this relationship depends on the type of CSSR and burning card. A method of analysis based on image processing of digital scanned images of burned cards is used. With this method, the temporal evolution of the burn width with 1 min resolution can be obtained. From this, SD is easily calculated and compared with the traditional (i.e., visual) determination. The method tends to slightly overestimate SD, but the thresholds that are used in the image processing could be adjusted to obtain an improved estimation. Regarding the burn width, experimental results show that there is a high correlation between two different models of CSSRs, as well as a strong relationship between burn widths and DSI at a high-temporal resolution. Thus, for example, hourly DSI may be estimated from the burn width with higher accuracy than based on burn length (for one of the CSSR, relative root mean squared error is 24 and 30%, respectively; mean bias error is -0.6 and -30.0 W m<sup>-2</sup>, respectively). The method offers a practical way to exploit long-term sets of CSSR cards to create long time series of DSI. Since DSI is affected by atmospheric aerosol content, CSSR records may also become a proxy measurement for turbidity and atmospheric aerosol loading
publishDate 2015
dc.date.none.fl_str_mv 2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10256/11847
http://hdl.handle.net/10256/11847
url http://hdl.handle.net/10256/11847
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.5194/amt-8-183-2015
info:eu-repo/semantics/altIdentifier/issn/1867-1381
info:eu-repo/semantics/altIdentifier/eissn/1867-8548
info:eu-repo/grantAgreement/MICINN//CGL2010-18546
dc.rights.none.fl_str_mv Attribution 3.0 Spain
http://creativecommons.org/licenses/by/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution 3.0 Spain
http://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv European Geosciences Union (EGU)
publisher.none.fl_str_mv European Geosciences Union (EGU)
dc.source.none.fl_str_mv Atmospheric Measurement Techniques, 2015, vol. 8, núm. 1, p. 183-194
Articles publicats (D-F)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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