Spatiotemporal characteristics of interannual temperature variations in the Tsushima Strait

Authors: Senjyu, Tomoharu1; Matsui, Sigeaki2; Han, In-Seong3

Source: Journal of Oceanography, Volume 66, Number 6, December 2010 , pp. 789-799(11)

Publisher: Springer

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Abstract:

Spatiotemporal characteristics of interannual temperature variations in the Tsushima Strait are investigated on the basis of historical hydrographic data applying the same procedures as Senjyu et al. (2006). Empirical orthogonal function (EOF) analysis revealed that the most energetic mode of variation (the EOF first mode), which accounts for about 31.5% of the total variance, is the in-phase temperature change for the entire strait. The wintertime temperature variation described by the first mode is associated with the wintertime heat flux in the northern East China Sea, while they are poorly correlated in other seasons. The large standard deviation in the time coefficient of the first mode in August suggests a relationship with the horizontal heat advection in summer in the northern East China Sea. On the other hand, the EOF second mode, which explains about 12.6% of the total variance, is associated with the stratification and baroclinicity in the strait. The time coefficient of the EOF second mode negatively correlates with the baroclinic volume transport through the strait in summer. Comparison of temporal variations among the leading EOF modes for temperature and salinity shows no significant correlations. This indicates that the principal modes of variation in temperature and salinity vary independently within an interannual timescale.

Keywords: EOF analysis; East China Sea; Japan Sea; Tsushima Current; Tsushima Strait; baroclinic volume transport; interannual variation; seasonal variation; surface heat flux; temperature and salinity

Document Type: Research Article

DOI: http://dx.doi.org/10.1007/s10872-010-0064-2

Affiliations: 1: Research Institute for Applied Mechanics, Kyushu University, Kasuga-Koen, Kasuga, Fukuoka, 816-8580, Japan, Email: senjyu@riam.kyushu-u.ac.jp 2: Fukuoka Fisheries and Marine Technology Research Center, Imazu, Nishi-ku, Fukuoka, 819-0165, Japan 3: National Fisheries Research and Development Institute, 408 Sirang-Ri, Gijang-Eup, Gijang-Kun, Busan, 619-902, Korea

Publication date: December 1, 2010

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