Atmospheric Correction of Satellite Ocean-Color Imagery During the PACE Era
Abstract
The Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission will carry into space the Ocean Color Instrument (OCI), a spectrometer measuring at 5 nm spectral resolution in the ultraviolet (UV) to near infrared (NIR) with additional spectral bands in the shortwave infrared (SWIR), and two multi-angle polarimeters that will overlap the OCI spectral range and spatial coverage, i. e., the Spectrometer for Planetary Exploration (SPEXone) and the Hyper-Angular Rainbow Polarimeter (HARP2). These instruments, especially when used in synergy, have great potential for improving estimates of water reflectance in the post Earth Observing System (EOS) era. Extending the top-of- atmosphere (TOA) observations to the UV, where aerosol absorption is effective, adding spectral bands in the SWIR, where even the most turbid waters are black and sensitivity to the aerosol coarse mode is higher than at shorter wavelengths, and measuring in the oxygen A-band to estimate aerosol altitude will enable greater accuracy in atmospheric correction for ocean color science. The multi-angular and polarized measurements, sensitive to aerosol properties (e. g., size distribution, index of refraction), can further help to identify or constrain the aerosol model, or to retrieve directly water reflectance. Algorithms that exploit the new capabilities are presented, and their ability to improve accuracy is discussed. They embrace a modern, adapted heritage two-step algorithm and alternative schemes (deterministic, statistical) that aim at inverting the TOA signal in a single step. These schemes, by the nature of their construction, their robustness, their generalization properties, and their ability to associate uncertainties, are expected to become the new standard in the future.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 26, 2019
- Accession Number
- AD1097249
Entities
People
- Ali Omar
- Amir Ibrahim
- Anthony B. Davis
- Bo-cai Gao
- Brian Cairns
- Bruno Pelletier
- Byran A. Franz
- David R. Thompson
- Didier Ramon
- Emmanuel S. Boss
- Francois Steinmetz
- Heidi M. Dierssen
- Jacek Chowdhary
- Jing Tan
- Kirk Knobelspiesse
- Lorraine A. Remer
- Lydwine Gross
- Odele Coddington
- Oleg Dubovik
- Olga Kalashnikova
- Otto Hasekamp
- Peng-wang Zhai
- Pierre-yves Deschamps
- Robert J. Frouin
- Xin Huang
- Ziauddin Ahmad
Organizations
- United States Naval Research Laboratory