Interannual mode of sea level in the South China Sea and the roles of El Niño and El Niño Modoki

Details Interannual mode of sea level in the South China Sea and the roles of El Niño and El Niño Modoki Interannual mode of sea level in the South China Sea and the roles of El Niño and El Niño Modoki

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3503601c&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 3, CiteID L03601

Physics

7

Oceanography: Physical: Enso (4922), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Oceanography: General: Descriptive And Regional Oceanography, Oceanography: Physical: Sea Level: Variations And Mean (1222, 1225, 1641)

Scientific paper

ENSO-scale variation of the summer ocean circulation in the South China Sea (SCS) is investigated. The interannual mode of SSH features a north-south dipole pattern that modulates the cold jet off Vietnam. During the summers before and after the El Niño, the mode has opposite signs of extrema. Strengthened circulations couple with the cold SSTAs during the El Niño developing summers; weakened circulations accompany the warm SSTAs during the decaying summers. Heat advection by the basin circulation modulates the SST variation. The impact of the 1997 El Niño on the SCS circulation contrasting that of 1994 and 2002 El Niño Modoki is assessed. With moderate SST warming but further westward shift of the low-level convergence of the atmosphere in the equatorial Pacific, the El Niño Modoki phenomenon enhanced the western North Pacific summer monsoon inside the SCS, driving stronger circulations in both the summers of 1994 and 2002.

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