Decadal change in intraseasonal variability over the South China Sea

Details Decadal change in intraseasonal variability over the South China Sea Decadal change in intraseasonal variability over the South China Sea

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3606810k&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 6, CiteID L06810

Physics

2

Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Atmospheric Processes: Tropical Meteorology

Scientific paper

Evidence is presented to reveal a decadal change around mid-1990s in the behavior of intraseasonal variability (ISV) over the South China Sea (SCS). During 1979-1993, the ISV has a spectral peak around 64 days, which is longer than in the recent epoch of 1994-2007 (around 42 days). The ISV event in 1979-1993 involves a merging process of the northward and westward propagating convection anomalies over the western North Pacific. The ISV in 1994-2007 has no such a merging process but exhibits a tilted band structure extending from the northern Indian Ocean to the SCS, which is strongly connected to the equatorial eastward propagating Madden-Julian Oscillation. The merging process during 1979-1993 modified the ISV over the SCS, resulting in the prolonged period, enhanced convective activity and a weakened relationship with the eastward propagating MJO. The possible cause of this change is discussed.

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