Bivariate downscaling with asynchronous measurements. (English) Zbl 1302.62258

Summary: Statistical downscaling is a useful technique to localize global or regional climate model projections to assess the potential impact of climate changes. It requires quantifying a relationship between climate model output and local observations from the past, but the two sets of measurements are not necessarily taken simultaneously, so the usual regression techniques are not applicable. In the case of univariate downscaling, the Statistical Asynchronous Regression (SAR) method of T. P. O’Brien, D. Sornette, and R. L. McPherron [“Statistical asynchronous regression: determining the relationship between two quantities that are not measured simultaneously”, J. Geophys. Res. 106, 13247–13259 (2001; doi:10.1029/2000JA900193)] provides a simple quantile-matching approach with asynchronous measurements. In this paper, we propose a bivariate downscaling method for asynchronous measurements based on a notion of bivariate ranks and positions. The proposed method is preferable to univariate downscaling, because it is able to preserve general forms of association between two variables, such as temperature and precipitation, in statistical downscaling. This desirable property of the bivariate downscaling method is demonstrated through applications to simulated and real data.


62P12 Applications of statistics to environmental and related topics


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