Assessment of Eutrophication Using Satellite Chlorophyll-a Concentration in the NOWPAP Region

Assessment of eutrophication in the Northwest Pacific region is conducted using satellite-derived chlorophyll-a concentrations. Thresholds for eutrophic and oligotrophic conditions are defined, with a focus on the years 1998 to 2017. The potential enhancement of eutrophication assessment in coastal zones through the use of SGLI on the GCOM mission is also discussed, showcasing the importance of monitoring and managing eutrophication in marine environments.

• Eutrophication assessment
• Satellite-derived data
• Chlorophyll-a concentration
• NOWPAP region
• Coastal zone monitoring

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1. Assessment of eutrophication using satellite derived chlorophyll-a concentration in the NOWPAP region Genki Terauchi Email: Terauchi@npec.or.jp Northwest Pacific Action Plan Special Monitoring & Coastal Environmental Assessment Regional Activity Centre (NOWPAP CEARAC)

2. Assessment of eutrophication by the NOWPAP Common Procedure More eutrophic Threshold = 5 ug/L Oligotrophic (Less eutrophic) Becoming oligotrophic (less eutrophic) Becoming eutrophic NOWPAP CEARAC 2009, 2014)

3. Assessment of eutrophication in the Northwest Pacific Region using satellite Chl-a from 1998 to 2015 0.1 1 10 64 mg m-3 -0.3 0 0.3 (mg m-3/year) HD HN HI LD LN LI Terauchi et al (2018)

4. Rapid assessment of eutrophication using satellite Chl-a from 1998 to 2017 HD HN HI G. Terauchi and E. R. Ma re (2018) LD LN LI

5. Use of SGLI of the GCOM-Mission will enhance the applicability of satellite Chl-a in eutrophication assessment in coastal zone Chlorophyll-a concentration on May 23, 2018 observed by SGLI on board GCOM-C mission. Image provided by Dr. Hiroshi Murakami, JAXA