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Atmospheric Rivers over the Northwestern Pacific: Climatology and Interannual Variability

TitleAtmospheric Rivers over the Northwestern Pacific: Climatology and Interannual Variability
Publication TypeJournal Article
Year of Publication2017
AuthorsKamae Y., Mei W, Xie SP, Naoi M., Ueda H.
JournalJournal of Climate
Date Published2017/08
Type of ArticleArticle
ISBN Number0894-8755
Accession NumberWOS:000405470400001
Keywordseast-asian climate; el-nino; extratropical cyclones; extreme precipitation; indo-western pacific; internal variability; multiscale features; north; pacific; rainy-season; summer monsoon

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

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