The influence of Pacific-North American teleconnection on the North Pacific SST anomalies in Wintertime under the global warming

Abstract The impact of the enhancing Pacific-North American teleconnection (PNA) on intensity first mode SST anomalies (SSTa) in wintertime North Pacific [known as decadal oscillation (PDO)-like pattern] under global warming is studied using reanalysis datasets and 12 selected CMIP5 models. robust observational result PNA one month ahead PDO shows that has a great effect PDO-like SSTa. intensities are defined with elimination ENSO signals to evaluate direct warming. By comparing RCP8.5 historical scenario multi-models (PNA enhanced models), future projection illustrates will intensify 2.2 times its internal variability. Approximately 67% increase variations contributed by PNA-induced SSTa ensemble mean. Models stronger intensification variability tends have larger magnitude response Pacific, which more contributions enhancement change warmer climate. This may shed some light relative role forcing