Variability of summer water-mass structure in Toyama bay coastal-zone

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  • Watanabe Yoshimi
    Faculty of Science / Graduate School of Science and Engineering, University of Toyama
  • Matsuura Tomonori
    Faculty of Science / Graduate School of Science and Engineering, University of Toyama
  • Chiba Hajime
    Department of Maritime Technology, Toyama National College of Technology

Bibliographic Information

Other Title
  • 富山湾沿岸における夏季海洋鉛直構造の変動特性
  • トヤマワン エンガン ニ オケル カキ カイヨウ エンチョク コウゾウ ノ ヘンドウ トクセイ

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Abstract

<p>Variations of summer water-mass structure in Toyama bay coastal-zone are investigated using CTD data and a second moment turbulent closure model (Mellor and Yamada, 1974) forced by windstress, heat flux and freshwater flux in summer (July to September). Forcing fluxes, wind stress, heat flux, and freshwater flux are obtained from the appropriate daily observational data using a bulk method. Daily mean heat fluxes extremely over estimate surface temperature in the model. However, the heat flux in the time interval of one hour is able to reproduce nearly the actual ocean temperature. Then it is found that the daily changing heat flux and wind stress are crucial to form summer ocean stratification in Toyama bay. In the numerical experiments in summer from 2004 to 2009, the outstanding characteristics of stratifying and mixing process against the forcing are captured and are similar to observational results for each year. Wind stress, heat flux, and freshwater flux play an important role in stratifying and/or mixing surface water mass from surface to 50 m. In particular, the experiments are carried out for four cases of different freshwater input during severe rainfall in July, 2006 and following to August-September. As a result, for the case of increasing river runoff the low salinity layer develops prominently and affects the stratification and mixing of the coastal-zone mass water in Toyama bay.</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 22 (4), 97-117, 2013-07-15

    The Oceanographic Society of Japan

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