Time series of physical and optical parameters off Shimane, Japan, during fall of 1993: First observation by moored optical buoy system for ADEOS data verification

J. Ishizaka, I. Asanuma, N. Ebuchi, H. Fukushima, H. Kawamura, K. Kawasaki, M. Kishino, M. Kubota, H. Masuko, S. Matsumura, S. Saitoh, Y. Senga, M. Shimanuki, N. Tomii, M. Utashima

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

A moored optical buoy system has been developed by the National Space Developmental Agency of Japan (NASDA) for verification of the ocean-observing sensors of the Advanced Earth Observation Satellite (ADEOS). The buoy was operated from August 25 to November 26, 1993, in the Japan Sea, off Shimane, Japan. Three-months time series of physical parameters indicate that the decrease of insolation and increase of wind velocity caused cooling of the sea surface and deepening of the mixed layer. The optical measurement systems of the buoy are still underdeveloped, and the experiment indicated several points that have to be improved. However, chlorophyll a concentrations, estimated from upward radiance and downward irradiance at 1.8-m depth, are generally consistent with the chlorophyll fluorescence measured by a fluorometer of the buoy system. The time change of the chlorophyll a concentration showed a gradual increase during October and a decrease in November. Simple calculations of enrichment of the mixed layer and critical depth theory could explain the fall bloom. Sea surface temperature showed a good correlation with coincident AVHRR/NOAA-12 MCSST data. Wind speed and direction and wave height also showed good correlations with ERS-1/AMI and TOPEX/POSEIDON data. The optical buoy system is useful for both verification of satellite data and understanding the time changes of physical and biological parameters.

Original languageEnglish
Pages (from-to)245-258
Number of pages14
JournalJournal of Oceanography
Volume53
Issue number3
Publication statusPublished - 1997 Jun 1

Keywords

  • Japan Sea
  • Mixed layer
  • Ocean color
  • Optical buoy
  • Phytoplankton bloom
  • Remote sensing
  • Scatterometer
  • Sea surface temperature
  • Wind

ASJC Scopus subject areas

  • Oceanography

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