Dynamically Downscaled Precipitation over Northern California Based on CMIP5 Future Climate Projections

摘要

Precipitation over Northern California under future climate conditions was obtained by dynamically downscaling IPCC CMIP5 future climate projection realizations. Six different future climate projection realizations from three general circulation models (GCMs: CCSM4, HadGEM2ES and MIROC5) based on two CMIP5 future climate scenarios (RCP4.5 and RCP8.5) were dynamically downscaled at 9 km resolution grids over eight study watersheds in Northern California for a period of 90 water years (2011 through 2100) by means of a regional climate model, the weather research and forecasting (WRF) model. Before investigating future climate change impacts based on the projections, model biases were corrected by comparing the dynamically downscaled precipitation based on the historical runs of the GCMs with the corresponding observations. The bias-corrected results were used to calculate basin-average precipitation over the eight study watersheds. Here some results of basin-average precipitation over the eight stud watershed are presented.