HR: 1340h
AN: A43B-1145    [Abstracts]
TI: Relationship between the ENSO and northward propagating intraseasonal oscillation associated with the East Asian summer monsoon
AU: * Seo, K
EM: khseo@pusan.ac.kr
AF: Pusan National University, Division of Earth Environmental System, Kuemjeong-Gu, Jangjeon-Dong, Busan, 609-734, Korea, Republic of
AU: Yun, K
EM: kssh@pusan.ac.kr
AF: Pusan National University, Division of Earth Environmental System, Kuemjeong-Gu, Jangjeon-Dong, Busan, 609-734, Korea, Republic of
AU: Ha, K
EM: kjha@pusan.ac.kr
AF: Pusan National University, Division of Earth Environmental System, Kuemjeong-Gu, Jangjeon-Dong, Busan, 609-734, Korea, Republic of
AB: Observational studies are presented on the relationship between ENSO and the northward propagating intraseasonal oscillation (NPISO) in the East Asian Summer Monsoon (EASM) system. The summer NPISO activity shows a significant correlation with the preceding winter extreme phase of ENSO cycles. A higher correlation appears during late summer, consistent with frequent heavy rainfall events at that time as revealed in some previous case studies. The westwardly expanded broad anticyclonic circulation over the western North Pacific and the smaller cyclonic circulation around Korea and Japan are found to be associated with the NPISO activity. ENSO affects the late summer NPISO activity through an atmospheric bridge and downstream wave propagation; the springtime Indian Ocean sea surface temperature warming induced by ENSO through the Walker circulation leads to suppressed convection over the Philippine Sea and this generates the forced Rossby wave train, forming the above low-level circulation anomalies.
DE: 0429 Climate dynamics (1620)
DE: 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions (0762, 1218, 3319, 4550)
DE: 1610 Atmosphere (0315, 0325)
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1620 Climate dynamics (0429, 3309)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting