Autor según el artículo: Venema VKC; Mestre O; Aguilar E; Auer I; Guijarro JA; Domonkos P; Vertacnik G; Szentimrey T; Stepanek P; Zahradnicek P; Viarre J; Müller-Westermeier G; Lakatos M; Williams CN; Menne MJ; Lindau R; Rasol D; Rustemeier E; Kolokythas K; Marinova T; Andresen L; Acquaotta F; Fratianni S; Cheval S; Klancar M; Brunetti M; Gruber C; Prohom Duran M; Likso T; Esteban P; Brandsma T
Departamento: Geografia
Autor/es de la URV: Aguilar Anfrons, Enrique Modesto / DOMONKOS, PÉTER
Palabras clave: United-states Time-series Temperature data Surrogate data Statistical characteristics Precipitation series Inhomogeneities Homogeneity test Discontinuities Climate data
Resumen: The COST (European Cooperation in Science and Technology) Action ES0601: advances in homogenization methods of climate series: an integrated approach (HOME) has executed a blind intercomparison and validation study for monthly homogenization algorithms. Time series of monthly temperature and precipitation were evaluated because of their importance for climate studies and because they represent two important types of statistics (additive and multiplicative). The algorithms were validated against a realistic benchmark dataset. The benchmark contains real inhomogeneous data as well as simulated data with inserted inhomogeneities. Random independent break-type inhomogeneities with normally distributed breakpoint sizes were added to the simulated datasets. To approximate real world conditions, breaks were introduced that occur simultaneously in multiple station series within a simulated network of station data. The simulated time series also contained outliers, missing data periods and local station trends. Further, a stochastic nonlinear global (network-wide) trend was added. Participants provided 25 separate homogenized contributions as part of the blind study. After the deadline at which details of the imposed inhomogeneities were revealed, 22 additional solutions were submitted. These homogenized datasets were assessed by a number of performance metrics including (i) the centered root mean square error relative to the true homogeneous value at various averaging scales, (ii) the error in linear trend estimates and (iii) traditional contingency skill scores. The metrics were computed both using the individual station series as well as the network average regional series. The performance of the contributions depends significantly on the error metric considered. Contingency scores by themselves are not very informative. Although relative homogenization algorithms typically improve the homogeneity of temperature data, only the best ones improve precipitation data. Training the users on homogenization software was found to be very important. Moreover, state-of-the-art relative homogenization algorithms developed to work with an inhomogeneous reference are shown to perform best. The study showed that automatic algorithms can perform as well as manual ones. © Author(s) 2012.
Áreas temáticas: Stratigraphy Paleontology Meteorology & atmospheric sciences Global and planetary change Geosciences, multidisciplinary Geociências Ciências ambientais
Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
Direcció de correo del autor: enric.aguilar@urv.cat
Identificador del autor: 0000-0002-8384-377X
Fecha de alta del registro: 2024-06-01
Versión del articulo depositado: info:eu-repo/semantics/publishedVersion
Referencia al articulo segun fuente origial: Climate Of The Past. 8 (1): 89-115
Referencia de l'ítem segons les normes APA: Venema VKC; Mestre O; Aguilar E; Auer I; Guijarro JA; Domonkos P; Vertacnik G; Szentimrey T; Stepanek P; Zahradnicek P; Viarre J; Müller-Westermeier G (2012). Benchmarking homogenization algorithms for monthly data. Climate Of The Past, 8(1), 89-115. DOI: 10.5194/cp8892012
URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
Entidad: Universitat Rovira i Virgili
Año de publicación de la revista: 2012
Tipo de publicación: Journal Publications
Repositori URV