Numerical study of the summer temperature decrease induced by the enhancement of estuarine circulation in Fukuoka Bay

Kazuhiro Aoki, Atsuhiko Isobe

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The Princeton Ocean Model with realistic bottom topography has been used to investigate the summer temperature decrease in the past 25 years in Fukuoka Bay. The vertical mixing of the model is expressed by a scheme that effectively includes the influences of interannual variations of tidal currents and wind. The results show that the historical temperature decrease in summer has been caused by tidal currents and wind weakening in the past 25 years in Fukuoka Bay. The weakening of tidal currents and wind gives rise to weakening of the vertical mixing, and to enhancement of the estuarine circulation in the bay. The enhancement of the estuarine circulation activates the inflow of open-ocean water toward Fukuoka Bay. Coastal water in summer has therefore tended to be colder and more saline in the past 25 years. This interannual variation in coastal waters is called "open-oceanization" in this study. On the basis of the numerical model, it is anticipated that the temperature will decrease by 0.2°C in the next 25 years in Fukuoka Bay if the tide and wind weaken persistently as in the present bay.

Original languageEnglish
Pages (from-to)207-217
Number of pages11
JournalJournal of Oceanography
Volume62
Issue number2
DOIs
Publication statusPublished - Apr 2006

All Science Journal Classification (ASJC) codes

  • Oceanography

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