12 December 2006 Condition of red tide appearance in Wakasa Bay based on Terra, Aqua/MODIS images
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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 April, 2005 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/m3, (2) the range of sea surface temperature (SST) is limited in a range from 12 to 20oC and (3) the period of sunlit time in spring is also a significantly sensitive factor. We 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. The problem of coincidence between colored region due to SS (Suspended Sediment) and red tide region using only band1 of MODIS, has been solved by using NDVI images in addition to band1 images together as two dimensional diagram.
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Takashi Aoyama, Takashi Aoyama, Hiroshi Oya, Hiroshi Oya, } "Condition of red tide appearance in Wakasa Bay based on Terra, Aqua/MODIS images", Proc. SPIE 6412, Disaster Forewarning Diagnostic Methods and Management, 64120V (12 December 2006); doi: 10.1117/12.693712; https://doi.org/10.1117/12.693712

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