Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-CG Complex & General

[A-CG45] Visible Remote Sensing of Hydrospheric Science and Its Application

Tue. May 28, 2019 10:45 AM - 12:15 PM 103 (1F)

convener:Joji Ishizaka(Institute for Space-Earth Environmental Research, Nagoya University), Mitsuhiro Toratani(School of Engineering, Tokai University), Yuji Sakuno(Graduate School of Engineering, Hiroshima University), Toru Hirawake(Faculty of Fisheries Sciences, Hokkaido University), Chairperson:Joji Ishizaka(名古屋大学宇宙地球環境研究所)

11:30 AM - 11:45 AM

[ACG45-10] Exploring the Potentials of Google Earth Engine for Global Assessment of Coastal Eutrophication Based on Chlorophyll-a concentration

*Eligio de Raus Maure1, Genki Terauchi1, Joji Ishizaka2 (1.Northwest Pacific Region Environmental Cooperation Center, 2.Institute for Space-Earth Environmental Research, Nagoya University)

Keywords:coastal eutrophication, assessment, satellite, chlorophyll-a concentration, google earth engine

Eutrophication is either emerging or growing environmental issue in many parts of the global marine systems in the ocean. This deterioration in water quality in the coastal regions may at times result in the appearance of harmful algal blooms or hypoxic conditions that affects large spatial and temporal scales with serious damages to the environment and economy, and the marine ecosystem itself. To assess the coastal eutrophication the Special Monitoring and Coastal Environment Assessment Regional Activity Centre (of the Action Plan for the Protection, Management and Development of the Marine and Coastal Environment of the Northwest Pacific Region of the United Nations Environmental Programme) developed a screening procedure to detect symptoms of eutrophication based on satellite observations of chlorophyll-a concentration. The methodology was originally developed for the Toyama Bay, Japan and later applied to the whole Northwest Pacific region. In this presentation, we introduced the method and its applicability to the global ocean. Furthermore, we also introduce the potentials of the Google Earth Engine (GEE)—a cloud-based tool with planetary-scale analysis capability—for future coastal eutrophication assessment based on recent higher resolution ocean colour sensors such as SGLI on GCOM-C with 250 m or Sentinel-3 with 300 m spatial resolutions. Once the GEE is proven useful, it will be an important tool in providing rapid assessment of the status of marine systems in many regions where the information on the status and extent of coastal eutrophication is very limited.