Influence of the Northern Hemisphere annular mode on ENSO by modulating westerly wind bursts

摘要: and high latitudes. Conversely, Thompson Lorenz [2004] attempted to detect the effects of both hemispheric annular modes (AMs) on tropics. They showed coupling between AMs tropical atmosphere that a wintertime positive (negative) AM generates upper tropospheric zonal mean westerly (easterly) anomalies in tropics after 2-week lag. These results suggest link NAM variability. However, they did not note any direct influences ENSO. [3] This study examined Based previous studies, we lead lag relationships ENSO all seasons using reanalysis data set. The observational evidence revealed statistically significant relationship signature To strengthen this finding, also used an atmospheric general circulation model (AGCM) simulate climatological monthly sea surface temperature (SST) distributions.