MODIS画像に基づく若狭湾の赤潮発生条件

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  • Condition of red tide appearance in Wakasa bay based on MODIS images
  • MODIS ガゾウ ニ モトズク ワカサワン ノ アカシオ ハッセイ ジョウケン

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Since June, 2004, studies on triggering factors of the red tide have been carried out in Awara Space Radio Observatory (ASRO), Fukui University of Technology utilizing directly received data of MODIS on the Terra and Aqua satellites which have been acquired in ASRO. Preliminary results of the data analyses for the period from July, 2001 to September, 2006 indicate conditions, for the appearance of the red tide bloom in Wakasa bay as follows : (1) the threshold amount of chlorophyll-a is close to 1.5mg/m^3, (2) the range of sea surface temperature (SST) is limited in a range from 12 to 20℃ and (3) the period of sunlit time in spring is also a significantly sensitive factor. We also propose here to utilize MODIS band1 images corresponding to a red band with spatial resolution of 250m together with NDVI (Normalized Difference Vegetation Index) images which has also spatial resolution of 250m, for the confirmation of the red tide.

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