Journal of Oceanography

, Volume 70, Issue 2, pp 175–184 | Cite as

Preliminary assessment of eutrophication by remotely sensed chlorophyll-a in Toyama Bay, the Sea of Japan

  • Genki Terauchi
  • Ryo Tsujimoto
  • Joji Ishizaka
  • Hideaki Nakata
Original Article

Abstract

Time series of the chlorophyll-a concentration (Chl-a) observed by ocean color satellites from 1998 to 2009 were used to assess eutrophication in Toyama Bay, the Sea of Japan. An overall mean of Chl-a during the 12-year period was used to divide the study area into “high” or “low” Chl-a areas based on a reference condition of 5 mg m−3. The annual maximum monthly mean Chl-a trend was estimated pixel-wise and its significance examined by the Sen slope test at a 90 % confidence level. By combining the level and trend of remotely sensed Chl-a, Toyama Bay was then classified into six eutrophication states: high-increasing, high-no trend, high-decreasing, low-increasing, low-no trend and low-increasing. Our study indicates that the combined use of both the level and trend of remotely sensed Chl-a can be an efficient method to preliminarily assess eutrophication of coastal waters after a quality screening process with level 2 flags and validation with in situ Chl-a data.

Keywords

Eutrophication Phytoplankton Ocean color radiometry Chlorophyll-a Coastal environment 

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Copyright information

© The Oceanographic Society of Japan and Springer Japan 2014

Authors and Affiliations

  • Genki Terauchi
    • 1
    • 2
  • Ryo Tsujimoto
    • 1
  • Joji Ishizaka
    • 3
  • Hideaki Nakata
    • 4
  1. 1.Northwest Pacific Region Environmental Cooperation CenterToyamaJapan
  2. 2.Graduate School of Science and TechnologyNagasaki UniversityNagasakiJapan
  3. 3.Hydrospheric Atmospheric Research CenterNagoya UniversityNagoyaJapan
  4. 4.Graduate School of Fisheries Science and Environmental StudiesNagasaki UniversityNagasakiJapan

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