Interannual salinity variations in the Tsushima Strait and its relation to the Changjiang discharge |
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Authors: | Tomoharu Senjyu Hirofumi Enomoto Takeshi Matsuno Sigeaki Matsui |
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Affiliation: | (1) Research Institute for Applied Mechanics, Kyushu University, Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan;(2) Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan;(3) Fukuoka Fisheries and Marine Technology Research Center, Imazu, Nishi-ku, Fukuoka 819-0165, Japan |
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Abstract: | Interannual salinity variations in the Tsushima Strait are investigated on the basis of historical hydrographic data. The
EOF analysis revealed that the most dominant mode is the in-phase salinity variation between the eastern and western channels.
The time coefficients of the EOF first mode in summer show a negative correlation with the Changjiang discharge, which indicates
that salinity in the Tsushima Strait tends to decrease over summer, related to a large discharge of the Changjiang. The eigenvectors
of the first mode are larger in the eastern channel than those in the western channel, though the low salinity water mainly
flows through the western channel. This is because the low salinity water spreads into the eastern channel as well as the
western channel over summers with a large discharge of the Changjiang. The out-of-phase salinity variation between the channels
is extracted as the EOF second mode; this is the predominant variation in the western channel. The time coefficients of the
second mode in summer show no significant correlations to the volume transports through the western channel and the transport
differences between channels. A relationship between the EOF second mode and variations in the wind stress over the East China
Sea is suggested. |
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Keywords: | Tsushima Strait low salinity water Changjiang discharge Changjiang Diluted Water summer salinity condition interannual variability EOF analysis Japan Sea East China Sea |
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