Regime-Dependent Nonstationary Relationship between the East Asian Winter Monsoon and North Pacific Oscillation

• DOI: 10.1175/jcli-d-13-00500.1
• Publication Date: 2014-08-25T20:05:23Z
• Authors: Gyundo Pak; Young-Hyang Park; Frederic Vivier; Young-Oh Kwon; Kyung-Il Chang
• Keywords: Teleconnection; Siberian High; Extratropical cyclone; Walker circulation; Atmospheric Circulation

Abstract The East Asian winter monsoon (EAWM) and the North Pacific Oscillation (NPO) constitute two outstanding surface atmospheric circulation patterns affecting sea temperature (SST) variability in western Pacific. present analyses show relationship between EAWM NPO their impact on SST are nonstationary regime-dependent with a sudden change around 1988. These tightly linked to upper-level Ural Kamchatka blockings, respectively. During 1973–87 strong epoch, were significantly correlated each other, but correlation practically vanishes during 1988–2002 weak epoch. This is related pronounced decadal weakening of Siberian high system over Eurasian continent after 1988 regime shift as well concomitant positive NPO-like dipole its eastward migration tropospheric There tight tropical–extratropical teleconnection which disappears epoch when there significant tropical influence enhanced storm tracks into eastern A tentative mechanism proposed, stressing pivotal role played above by trough resulting from abrupt decline since late 1980s.