Interannual variability of the South China Sea in a data assimilation model

Chau Ron Wu, C. W.June Chang

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Sea surface height (SSH) variations in the South China Sea are examined using results from a data assimilation model. After the SSH data have had the annual cycle removed, principal component analysis illustrates two distinct anomaly patterns. The first mode, strongest off Vietnam, would affect the basin-wide gyre intensity. The second mode consists of a meridional dipole feature with a nodal line around 12°N and is related to the development of the eastward jet and upwelling off Vietnam. Both EOF modes have significant interannual variations and are highly correlated to the ENSO events. The leading phase of mode 2 coefficient provides preliminary evidence for the air-sea interaction and the Pacific-East Asian teleconnection. An innovative mechanism is proposed to describe a weakened upwelling off Luzon in winter 1998. An extra-strong basin-wide warming in summer 1998 persists into fall and winter, preventing the formation of winter upwelling off Luzon in that year.

Original languageEnglish
Article numberL17611
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume32
Issue number17
DOIs
Publication statusPublished - 2005 Sep 16

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assimilation
data assimilation
China
upwelling
upwelling water
sea surface height
Vietnam
winter
air-sea interaction
air water interactions
teleconnection
gyre
basin
annual cycle
El Nino-Southern Oscillation
annual variation
principal component analysis
annual variations
principal components analysis
warming

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Interannual variability of the South China Sea in a data assimilation model. / Wu, Chau Ron; Chang, C. W.June.

In: Geophysical Research Letters, Vol. 32, No. 17, L17611, 16.09.2005, p. 1-4.

Research output: Contribution to journalArticle

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