Low-frequency temperature variability at Fukue Island located southwest of the Tsushima Straits

Atsuyoshi Manda, Atsuhiko Isobe, Kouichi Omura, Yusaku Kyozuka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Sea surface temperature (SST) and sea surface salinity variations at Fukue Island (located southwest of the Tsushima Straits) were investigated. In spring, low-frequency SST fluctuations with periods of 10-20 days predominate. Synthetic analysis of in situ observation and satellite infrared image reveals that these SST fluctuations are caused by movement of mixed warm water masses which have a temperature intermediate between those of the Kuroshio and the East China Sea (ECS) shelf waters. Since these fluctuations do not correspond with those in the Tsushima Straits, it is indicated that these water masses can hardly pass the Tsushima Straits while retaining their original water properties. In July, SST fluctuations with a period of several days are also found at Fukue Island. Since these SST fluctuations show an opposite correspondence with its salinity fluctuations and a good correspondence with the SST fluctuations at Okinoshima in the Tsushima Straits, it is inferred that warm and low-salinity water originated from the ECS shelf water causes these fluctuations and intrudes into the Tsushima Straits.

Original languageEnglish
Pages (from-to)141-152
Number of pages12
JournalJournal of Oceanography
Issue number2
Publication statusPublished - Apr 2000

All Science Journal Classification (ASJC) codes

  • Oceanography


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