Effect of coupled global climate models sea surface temperature biases on simulated climate of the western United States (CROSBI ID 289296)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Mejia, John F. ; Koračin, Darko ; Wilcox, Eric M.
engleski
Effect of coupled global climate models sea surface temperature biases on simulated climate of the western United States
To diagnose the influence of sea surface temperature (SST) biases on temperature and precipitation patterns in the western United States, we analysed atmospheric and coupled global climate model (GCM) simulated output from the Coupled and Atmospheric Model Intercomparison Project versions 3 and 5 (CMIP3, AMIP3, CMIP5, and AMIP5). We further analyse the impact of SST biases in regional cli- mate modelling simulations. CMIP3 and CMIP5 multi-model ensembles show sys- tematic warm SST biases offshore of California and the Baja California Peninsula (Baja) region, with ensemble mean SST biases of the order of ~3–5 C. Through- out the western United States, 75% of all models in CMIP3 and CMIP5 exhibit wet precipitation biases and corresponding cold biases in surface temperature. The CMIP5 ensemble shows on average a stronger and more consistent relationship between Baja SST biases and precipitation over the west compared to the CMIP3 ensemble. We attempted to isolate the atmospheric response to regional SST biases using a regional climate model (RCM) based on the Weather Research and Fore- casting model with a 36 km grid size. The RCM was driven with the CMIP3-CCSM3 as boundary conditions with and without corrections of simulated SSTs. Results from RCM simulations further confirm that SST biases impact cli- mate regionally and propagate over the western United States and can explain up to 80% of wet precipitation biases. Our regional GCM comparison and RCM experiment assess the robustness of model estimates of climate mean states and constitute an often neglected prerequisite for characterizing how errors transfer from GCM to regional downscaling modelling frameworks and how they could potentially affect downscaling application and impact studies.
CMIP3 ; CMIP5 ; dynamical downscaling ; error transfer ; precipitation bias ; RCM ; SST biases
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o izdanju
38 (14)
2018.
5386-5404
objavljeno
0899-8418
1097-0088
10.1002/joc.5817
Povezanost rada
Fizika, Geofizika, Interdisciplinarne prirodne znanosti