Relation Between Chlorophyll-A Concentration and Red Tide in the Intensive Study Area of the Ariake Sea, Japan in Winter Seasons by using MODIS Data

Kohei Arai

doi:10.14569/ijarai.2015.041002

Abstract

Relation between chlorophyll-a concentration and red tide in the intensive study area of the back of Ariake Sea, Japan in the recent winter seasons is investigated by using MODIS data. Mechanism of red tide appearance is not so clarified. On the other hand, chlorophyll-a concentration can be estimated with satellite remote sensing data. An attempt is made for estimation of the location and size of red tide appearance. In particular, severe damage due to red tide is suspected in the winter seasons now a day. Therefore, 6 years (winter 2010 to winter 2015) data of MODIS data derived chlorophyll-a concentration and truth data of red tide appearance (the location and the volume) which are provided by Saga Prefectural Fishery Promotion Center: SPFPC (once/10 days of shipment data) have been investigated. As the results of the investigation, it is found that a strong correlation between the chlorophyll-a concentration and red tide appearance together with the possible sources of the red tide.

Highlights

The Ariake Sea is the largest productive area of Nori (Porphyra yezoensis 1 ) in Japan
The densely distributed chlorophyll-a is flown to the south direction along with the sea water current in the Ariake bay while the densely distributed chlorophyll-a is flown from the Isahaya bay to the Taira-machi and far beyond the Shimabara offshore
It may say that the sources of red tide are different between Ariake bay and Isahaya bay

Summary

INTRODUCTION

The Ariake Sea is the largest productive area of Nori (Porphyra yezoensis 1 ) in Japan. In case of above red tides, bloom causative was Eucampia zodiacus 2. This bloom has being occurred several coastal areas in Japan and is well reported by Nishikawa et al for Harimanada sea areas [2]-[10]. The resultant lack of nutrients has suppressed the growth of “Nori” and lowered the quality of “Nori” products due to bleaching with the damage of the order of billions of yen [3] This bloom had been firstly developed at the eastern part of the Ariake Sea. as the field observation is time-. Almost every year, relatively large size of diatoms of Eucampia zodiacus appears in Ariake Sea areas.

The Procedure

EXPERIMENTS

Trend Analysis in the Case of March 2015

CONCLUSION