Description
Technical Session on Homogenization Algorithms
Barbara Chimani
(ZAMG)
23/01/2017, 14:55
Technical Session on Homogenization Algorithms
Oral Presentation
The homogenisation tool used at ZAMG for daily data is called HOMOP. It combines PRODIGE for break detection with SPLIDHOM and INTERP for break correction. Only break detection was used in this work.
In HOMOP three different penalty criteria are used for PRODIGE. The methods of Caussinus and Lyazrhi (1997), Jong et al (2003) and Lebarbier (2005). Addionally breaks are detected in different...
Dr
Jose A. Guijarro
(Spanish Meteorological Agency)
23/01/2017, 15:20
Technical Session on Homogenization Algorithms
Oral Presentation
Climatol’ is a contributed R package providing some tools for climatological tasks, the most important being the homogenization of climate time series by means of its homogen function. It was originally addressed to monthly series, but direct homogenization of daily series is also possible. However, homogenization of daily climatological series is recognized as a difficult task due to their...
Mr
Michal Elias
(RIGTC Zdiby)
23/01/2017, 15:45
Technical Session on Homogenization Algorithms
Oral Presentation
The presentation reviews a statistical method which has been implemented on an inhomogeneous synthetic climatological time-series. The main objective is to assess the method which is based on a two-sample t-statistics and which promotes the idea of comparing candidate series with a reference series that is assumed to be homogeneous. Among other things, we also introduce a reference series...
Dr
Roeland Van Malderen
(Royal Meteorological Institute of Belgium)
23/01/2017, 16:15
Technical Session on Homogenization Algorithms
Oral Presentation
We present three different tests, based on non-parametric techniques, for the objective identification of discontinuities in the mean (or median) of time series. These change-point tests rely on (the sum of) the ranks of the values in the sequence and do not require ‘metadata’ or comparison with neighbouring stations or reference data. We also present how these three tests are combined to...
23/01/2017, 16:30
Technical Session on Homogenization Algorithms
Oral Presentation
A t test is normally used to determine if the mean values of two datasets are significantly different from each other. Therefore, it is possible to be implemented in the difference of integrated water vapor (IWV) time series obtained from two techniques, e.g. GPS and EARI, in order to detect the potential temporal shifts in the data from the two techniques. A penalized maximal t test (PMT) to...
Mrs
Selma ZENGİN KAZANCI
(Karadeniz Technical University)
23/01/2017, 16:50
Technical Session on Homogenization Algorithms
Oral Presentation
Integrated water vapour (IWV) is calculated from processing of GNSS data and IWV time series are produced. IWV time series analysis is important to monitoring of climate changes. Inhomogeneities caused by earthquakes, changes in hardware or equipment etc., can affect actual trends and seasonal variability in time series. This work presents non-parametric techniques for trend and change point analysis.