Projected changes in characteristics of precipitation spatial structures over North America

作者: Karine Guinard , Alain Mailhot , Daniel Caya

DOI: 10.1002/JOC.4006

关键词:

摘要: Spatial structures of hourly precipitation fields were studied from three simulations the Canadian Regional Climate Model (CRCM) and observations National Centers for Environmental Prediction (NCEP) Stage IV analysis. Each structure, defined as a contiguous area above given threshold, was analysed through geometric characteristics (position, area, major minor axes, eccentricity, orientation) intensity (volume, mean maximum intensities, distribution within structure) 16 climatic regions covering North America. While providing new insights on spatial facet precipitation, this study aimed to: (1) assess performance CRCM to reproduce observed (2) analyse changes in between historical (1961–1990) future (2071–2100) periods. In addition, effect internal variability investigated using two CGCM-driven simulations. order performance, reanalysis-driven simulation first compared with then Results suggest that displayed intensities spatially more homogeneous than ones central eastern United States showed significantly lower volumes, areas. However, annual cycles characteristic values well reproduced. volumes during summer months southeastern when CRCM. Precipitation also larger shifted further north. Boundary conditions seemed influence mainly climate, results convective precipitations (increases heterogeneity structures), drier spring southwestern (decreases numbers wetter winter northern structures) autumn intensities).

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