Ocean Color Sensors for Coastal Monitoring

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Ocean Color Sensorsfor Coastal Monitoring

• JAXA EORC
• Hiroshi Murakami
• IGOS Coastal Theme, February 2004

Ishikari Bay GLI 250m 2003/07/26
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1. Planning of S-GLI mission

• JAXA and science groups have been investigating
  the next mission of GLI for several years
  frequent, visible-infrared, middle-resolution,
  and global-coverage radiometer (S-GLI).
• After the trouble of ADEOS-2 GLI, we are setting
  2008 as the launch date of the S-GLI prior
  mission (S-GLI ALOHA version). The sensor should
  be simple, low risk, long life, and has high
  applicability. (ALOHA Atmosphere, Land and Ocean
  Harmonized Answer)
• Main objective of the next mission will be
  Coastal Area research and monitoring with high
  frequency (once/day), high resolution (250m), and
  high SNR (for ocean color).
• All plans are still under discussion.

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2. Concept of S-GLI missionunder discussion

• We should understand and predict influences of
  human activities to the earth environment more
  clearly.
• Japan has a long coastline, active fishery and
  cultivation, dense population near the coast, and
  rapidly developing neighbors.
• ?We should have coastal monitoring sensors as
  an contribution to many people lived in the
  coastal environment all over the world.

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3. Objectives of the S-GLIunder discussion

• Understanding of coastal-area processes
• Income and expenditure of materials (carbon,
  soil, pollutant...) and heat.
• Process of primary production (contribution in
  the carbon cycle)
• Interaction between coast and open ocean.
• Coastal area monitoring
• Pollution of material and heat due to
  urbanization and industrialization
• Eutrophication (e.g., red tide) in the coastal
  and in-land waters
• Natural disasters (abnormal wind, rain, influence
  of an earthquake..)
• Estimation of productivity (fishery locations and
  a catch of fish)
• High resolution sea-ice position and displacement
• Near real-time inputs of high resolution
  numerical (physical, biological and chemical)
  models in the coastal area.

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4. Expected ocean products by S-GLI under
discussion

• Surface optical parameters
• Normalized water-leaving radiance
• Aerosol information
• Photosynthetically available radiation

• In-water parameters
• Chlorophyll-a concentration
• Suspended solid concentration
• Colored dissolved organic matter

• Thermal parameters
• Surface temperature

• Analyzed results
• Investigation of coastal-area processes
• Coastal area monitoring (near-real time)
• Contribution to the life of the people

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5. Current investigations for S-GLIGLI showed
possibility of 250-m ocean-color observation
1 km CHLA
clear eddy and current structure
250m CHLA
about 50km
Noise range is equivalent to small
structures. Need more SNR
Atmospheric correction by GLI 250m (CH23) 1km
(CH15) channels.
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5. Current investigations for S-GLIan example of
Tokyo-Bay
We are here.
250m CHLA 2003/06/05
2003/09/28
250m nLw RGB
about 50km
We can see structures around coast and mouth of
rivers