Phosphorus mass balance in a highly eutrophic semi-enclosed inlet near a big metropolis: A small inlet can contribute towards particulate organic matter production |
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Affiliation: | 1. Water Research Institute, National Research Council of Italy, IRSA-CNR, Section of Brugherio, Via del Mulino, 19, 20861 Brugherio, MB, Italy;2. Water Research Institute, National Research Council of Italy, IRSA-CNR, Via Salaria km 29.300, 00015 Monterotondo, RM, Italy;3. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, China;1. South China Sea Environment Monitoring Center, State Oceanic Administration (SOA), Guangzhou 510300, Guangdong, PR China;2. South China Sea Testing and Appraisal Center, State Oceanic Administration (SOA), Guangzhou 510300, Guangdong, PR China;3. Guangdong Institute of Analysis, Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Guangzhou 510070, Guangdong, PR China;1. National Marine Environmental Forecasting Center, Beijing 100081, China;2. Center for Marine Environmental Studies, Ehime University, Matsuyama 790-8577, Japan;3. Key Laboratory of Marine Environment and Ecology (Ocean University of China), Ministry of Education, Qingdao 266100, China |
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Abstract: | Terrigenous loading into enclosed water bodies has been blamed for eutrophic conditions marked by massive algal growth and subsequent hypoxia due to decomposition of dead algal cells. This study aims to describe the eutrophication and hypoxia processes in a semi-enclosed water body lying near a big metropolis. Phosphorus mass balance in a small inlet, Ohko Inlet, located at the head of Hiroshima Bay, Japan, was quantified using a numerical model. Dissolved inorganic phosphorous inflow from Kaita Bay next to the inlet was five times higher than that from terrigenous load, which may cause an enhancement of primary production. Therefore, it was concluded that not only the reduction of material load from the land and the suppression of benthic flux are needed, but also reducing the inflow of high phosphorus and oxygen depleted water from Kaita Bay will form a collective alternative measure to remediate the environmental condition of the inlet. |
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