4.3 Article

Island-enhanced cooling mechanism in typhoon events revealed by field observations and numerical simulations for a coral reef area, Sekisei Lagoon, Japan

期刊

OCEAN DYNAMICS
卷 67, 期 11, 页码 1369-1384

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s10236-017-1096-6

关键词

Typhoon; Sekisei Lagoon; Temperature; Numerical model; Local cooling; Field measurements

资金

  1. Ministry of the Environment [4-1304]
  2. Japan Society for the Promotion of Science (JSPS) [24246086, 15H02268, 25257305]
  3. JSPS [22740336, 26610167]
  4. JSPS Japan-Philippines Research Cooperative Program
  5. Japan Science and Technology Agency/Japan International Cooperation Agency Science and Technology Research Partnership tor Sustainable Development (JST/JICA SATREPS) program
  6. Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
  7. Grants-in-Aid for Scientific Research [22740336, 26610167] Funding Source: KAKEN

向作者/读者索取更多资源

While widely known for their destructive power, typhoon events can also bring benefit to coral reef ecosystems through typhoon-induced cooling which can mitigate against thermally stressful conditions causing coral bleaching. Sensor deployments in Sekisei Lagoon, Japan's largest coral reef area, during the summer months of 2013, 2014, and 2015 were able to capture local hydrodynamic features of numerous typhoon passages. In particular, typhoons 2015-13 and 2015-15 featured steep drops in near-bottom temperature of 5 A degrees C or more in the north and south sides of Sekisei Lagoon, respectively, indicating local cooling patterns which appeared to depend on the track and intensity of the passing typhoon. This was further investigated using Regional Ocean Modeling System (ROMS) numerical simulations conducted for the summer of 2015. The modeling results showed a cooling trend to the north of the Yaeyama Islands during the passage of typhoon 2015-13, and a cooling trend that moved clockwise from north to south of the islands during the passage of typhoon 2015-15. These local cooling events may have been initiated by the Yaeyama Islands acting as an obstacle to a strong typhoon-generated flow which was modulated and led to prominent cooling of waters on the leeward sides. These lower temperature waters from offshore may then be transported to the shallower inner parts of the lagoon area, which may partly be due to density-driven currents generated by the offshore-inner area temperature difference.

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