PACE SPEXone Level-2 data provides simultaneous aerosol and ocean color retrievals over ocean regions. The FastMAPOL algorithm uses a coupled atmosphere-ocean radiative-transfer model accelerated by deep neural networks to derive core geophysical variables. This near real-time version 3.0 data is produced by OB_CLOUD and distributed via NASA Earthdata.
Use Cases
- Analyzing aerosol composition by correlating aerosol optical thickness (aot), single scattering albedo (ssa), and refractive index (mr, mi) across fine and coarse modes.
- Modeling phytoplankton dynamics by examining chlorophyll-a concentration (chla_mapol) in relation to aerosol layer height (alh) and angstrom exponent.
- Studying ocean-atmosphere coupling by investigating relationships between ocean surface wind_speed and aerosol volume density (vd) or effective radius (reff_fine/coarse).
- Validating satellite retrievals by comparing angular remote sensing reflectance (Rrs1/Rrs2) and aerosol fine mode fraction (fmf) with other sensor data.
- Assessing climate impacts through time-series analysis of aerosol spherical fraction (sph) and aerosol effective variance (veff_fine/coarse).
Strengths
- Algorithm jointly solves for aerosol and ocean parameters using a coupled physical model, providing internally consistent retrievals.
- Retrieval process accelerated by deep neural networks for improved speed and accuracy over traditional methods.
- Provides multiple aerosol property columns (e.g., aot, ssa, reff, mr/mi) for total, fine, and coarse modes, enabling detailed analysis.
Limitations
- Data coverage is limited to ocean regions, excluding land and coastal aerosol studies.
- Sample size, row count, and specific temporal/spatial coverage are unknown from the description.
- Near real-time data may have lower fidelity compared to final science-quality products.
Provenance
- Source
- NASA Earthdata, produced by OB_CLOUD.
- Collection Method
- Retrievals from PACE SPEXone sensor using the Fast Multi-Angle Polarimetric Ocean and Land (FastMAPOL) algorithm.
- Time Range
- null
- Freshness
- Near real-time (NRT)
- Geography
- Regional coverage over ocean areas.