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Early warning system for algal blooms using satellite imageries in Jakarta Bay 1Research Centre for Oceanography, BRIN Jl. Pasir Putih I, Jakarta 14430, Indonesia Abstract Jakarta bay receives a lot of nutrients input from various sources such as agriculture, industries, domestic waste, and urban waste, and consequently results in eutrophication. The availability of nitrate and phosphate in the waters continuously may result in the waters becoming nutrients rich as is known as eutrophication. Coastal eutrophication and harmful algal blooms (HAB) have been identified as a major problem in Jakarta bay in the last decades. Coastal eutrophication is often associated with the occurrences of algal bloom or red tide. The study was conducted by monitoring the concentration of chlorophyll-a as an indicator of eutrophication using Terra and Aqua MODIS (Moderate-resolution Imaging Spectroradiometer) satellite data from 2004 to 2007. It was reported that during this period there were massive fish killings due to algal bloom events. Fish killed were correlated to the algal bloom occurrences, which were indicated by high chlorophyll-a concentration exceed than 10 mg/m3 and covering more than a quarter of the bay. However, sometimes there were no massive fish mortalities occurred although stronger and more intense algal blooms were detected. Mass mortalities of fishes were primarily due to the oxygen depletion after the highest peak of bloom. Also, another important key factor connected with massive fish-killing is the condition of weak water mass circulation or movement during the bloom events. The use of satellite imageries for monitoring is a very useful tool for the development of the early warning system of algal blooms in Jakarta Bay. Keywords: Algal blooms, satellite imagery, fish-killing, early warning system Topic: Aquatic Ecology and Conservation (International) |
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