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Keywords:
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Area of Science:

  • Oceanography and Remote Sensing
  • Biogeochemical ocean modeling
  • Radiative transfer modeling

Background:

  • NASA's PACE mission will utilize a hyper-spectral radiometer for global ocean biogeochemical analysis.
  • Accurate global ocean radiance simulations are crucial for PACE mission design and capability assessment.
  • Existing models require validation against satellite data for ocean constituent retrieval.

Purpose of the Study:

  • To assess the skill of a dynamic global ocean radiance simulation model.
  • To validate the model's ability to represent ocean biogeochemical constituents and water-leaving radiances.
  • To support pre-launch mission development and evaluate on-orbit capabilities for the PACE mission.

Main Methods:

  • Developed a dynamic global ocean model simulating phytoplankton groups, detritus, particulate inorganic carbon (PIC), and chromophoric dissolved organic carbon (CDOC).
  • Incorporated 1 nm spectral resolution for optical absorption and scattering processes.
  • Assimilated total chlorophyll, PIC, and aCDOC using satellite data and coupled the model with the Ocean-Atmosphere Spectral Irradiance Model (OASIM) for radiance estimation.

Main Results:

  • The 5-year simulation demonstrated statistically significant correlations for chlorophyll (r=0.869), PIC (r=0.868), and aCDOC (r=0.890) against satellite data.
  • Phytoplankton groups (diatoms, cyanobacteria, coccolithophores) showed significant correlations with in situ data.
  • Estimated normalized water-leaving radiances were within -10.4% bias of MODIS-Aqua data, with a mean correlation of 0.706.

Conclusions:

  • The dynamic global assimilated model shows significant skill in representing ocean optical constituents and water-leaving radiances.
  • The simulation's high spectral resolution and global coverage support PACE mission design, band selection, and observing scenario investigations.
  • The model provides a valuable tool for error characterization and assessing future satellite mission capabilities.