TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 58 (No. 4), pp. 599-609, 2002

Two Modes of Salinity and Temperature Variation in the Surface Layer of the Pacific Warm Pool

Kentaro Ando* and Yoshifumi Kuroda

Japan Marine Science and Technology Center, Natsushima, Yokosuka 237-0061, Japan

(Received 26 June 2001; in revised form 8 January 2002; accepted 9 January 2002)

Abstract: The characteristics of temperature and salinity variation in the Pacific warm pool were investigated using Empirical Orthogonal Function (EOF) analysis on one year's temperature and salinity data in the surface layer (0-50 m) obtained from the Triangle Trans-Ocean Buoy Network (TRITON) buoy array. Two dominant modes of surface temperature and salinity variation were found. One is a positive correlation mode where temperature and salinity were scattered almost parallel to isopycnal lines in a T-S diagram, which has little effect on the density field. The other is a negative correlation mode where temperature and salinity were distributed across isopycnal lines, which has a substantial impact on the density field. In particular, we found that the negative correlation mode at 5°N, 156°E was predominant on a seasonal time scale and contributed to the surface dynamic height variation, and therefore to surface geostrophic current.

*Corresponding author E-mail: andouk@jamstec.go.jp

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