[A-CG31] Nutrient footprint of primary production in the coastal and marginal seas of East and Southeast Asia

[ACG31-P07] Brief report: Nutrient distribution in the estuary of Pekalongan, North Java, Indonesia using chemical tracers

*北澤 唯佳¹、張 勁²、アンドレアス ロイ³、ヘンドラヤナ ヘンドラヤナ⁴、トレンゴノ ムクティ⁴、西澤 紗希² (1.富山大学持続可能社会創成学環、2. 富山大学学術研究部理学系、3.ジェンデラル・スディルマン大学自然科学系数理科学研究科、4.ジェンデラル・スディルマン大学水産海洋学部)

キーワード：水質汚染、海面上昇、インドネシア、栄養塩

Water pollution and sea level rise have occurred in wide coastal areas in Indonesia due to ongoing climate change and current increased human activities. In particular, northern part of Java Island has high density of housing, fishing, and industry, and there is an increasing need to monitor river and sea water quality to prevent water pollution. In addition, the region is considered to be one of the most vulnerable areas to sea level rise and flooding, leading to expansion of flooded areas and displacement of people. In order to solve these problems, the local municipality and the Indonesian government need to create policies that can respond to the problem and maintain the sustainability of these areas. The aim of this study is to clarify the sources, quantities, distribution patterns of the dissolved chemicals in the estuaries of Mrican River and Pencongan River in Pekalongan, North Java, and elucidate the impact of the chemical substances using oxygen and hydrogen stable isotopes and chemical compositions of river water and seawater. It is also expected international collaborative research will be conducted based on this study in Indonesia, consisting of other coastal regions in different Southeast Asian and African countries.