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The 30–60 day intraseasonal oscillation over the western North Pacific Ocean and its impacts on summer flooding in China during 1998
Author(s) -
Zhu Congwen,
Nakazawa Tetsuo,
Li Jianping,
Chen Longxun
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl017817
Subject(s) - climatology , subtropical ridge , monsoon , tropical cyclone , bengal , subtropics , convection , environmental science , monsoon trough , bay , western hemisphere warm pool , trough (economics) , east asian monsoon , oceanography , geology , precipitation , sea surface temperature , geography , meteorology , macroeconomics , fishery , economics , biology
Eastern China experienced a series of severe floods during the summer of 1998. These floods are shown to be consistent with the propagation and activity of the 30–60 day intraseasonal oscillation (ISO) over the western North Pacific (WNP), where the monsoon trough and the subtropical anti‐cyclone appear as an anti‐clockwise propagation with the enhanced and suppressed convective anomalies in a 30–60 day period. The Meiyu circulation pattern in the lower atmosphere successively dominates the WNP, which results in southern China and the Yangtze River valley suffering much more rainfall and floods than normal. There are remarkable signals of 30–60‐day ISO in convective anomalies over the Bay of Bengal and east of Philippine Sea. During the cycle of the 30–60 day ISO, these convective anomalies move towards the South China Sea (SCS), where they affect the convective activity of the SCS summer monsoon, therefore maintaining the cycle of 30–60 day ISO over the WNP.