Atmospheric Rivers over the Northwestern Pacific: Climatology and Interannual Variability

• DOI: 10.1175/jcli-d-16-0875.1
• Publication Date: 2017-04-17T18:25:06Z
• Authors: Youichi Kamae; Wei Mei; Shang-Ping Xie; Moeka Naoi; Hiroaki Ueda
• Keywords: Madden–Julian oscillation; Atmospheric Circulation

Abstract Atmospheric rivers (ARs), conduits of intense water vapor transport in the midlatitudes, are critically important for resources and heavy rainfall events over west coast North America, Europe, Africa. ARs also frequently observed northwestern Pacific (NWP) during boreal summer but have not been studied comprehensively. Here climatology, seasonal variation, interannual variability, predictability NWP (NWPARs) examined by using a large ensemble, high-resolution atmospheric general circulation model (AGCM) simulation global reanalysis. The AGCM captures characteristics climatology variability compared to reanalysis, suggesting strong sea surface temperature (SST) effect on NWPARs. summertime NWPAR occurrences tightly related El Niño–Southern Oscillation (ENSO) preceding winter through Indo–western Ocean capacitor (IPOC) effects. An enhanced East Asian monsoon low-level anticyclonic anomaly tropical western post–El Niño reinforce from tropics with increased occurrence coupling ENSO IPOC indicates high anomalous activity.