Short communication: Statistical downscaling of rainfall data using sparse variable selection methods

Authors:
A. Phatak;B. C. Bates;S. P. Charles
Affiliations:
CSIRO Climate Adaptation Flagship, Australia and CSIRO Mathematical & Information Sciences, Private Bag 5, Wembley, WA 6913, Australia;CSIRO Climate Adaptation Flagship, Australia and CSIRO Marine & Atmospheric Research, Private Bag 5, Wembley, WA 6913, Australia;CSIRO Climate Adaptation Flagship, Australia and CSIRO Land & Water, Private Bag 5, Wembley, WA 6913, Australia
Venue:
Environmental Modelling & Software
Year:
2011

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Abstract

In many statistical downscaling methods, atmospheric variables are chosen by using a combination of expert knowledge with empirical measures such as correlations and partial correlations. In this short communication, we describe the use of a fast, sparse variable selection method, known as RaVE, for selecting atmospheric predictors, and illustrate its use on rainfall occurrence at stations in South Australia. We show that RaVE generates parsimonious models that are both sensible and interpretable, and whose results compare favourably to those obtained by a non-homogeneous hidden Markov model (Hughes et al., 1999).