Effects of Atmospheric Correction Aerosol Distribution Uncertainty on Hyperspectral Retrieval Error of Chlorophyll-a

POSTER

Abstract

Ocean color satellite and airborne sensors can accurately monitor chlorophyll-a (chl-a) using remote sensing reflectance (Rrs), but Rrs must first be corrected for optical perturbations caused by the atmosphere. Here, we conduct a sensitivity analysis of the 6SV atmospheric correction algorithm in order to gauge its performance in retrieving accurate chl-a measurements while systematically altering the algorithm's aerosol parameters. 6SV was run using an uncorrected L1 AVIRIS image of Monterey Bay where chl-a was sampled at three ocean stations. 6SV was initially run using the most accurate input parameters available, including a local aerosol optical depth measurement (AOD). Corrections were performed for all three sampling stations using all 5 6SV aerosol models, and the resulting Rrs values were converted into chl-a concentration using the SeaWiFS OC4 Algorithm. AOD was altered iteratively in order to determine the effect on chl-a retrieval error. Results indicate that overestimating AOD leads to much higher error in chl-a retrieval as compared to underestimation. Out of the 5 6SV aerosol models, the coastal model produced the most accurate chl-a values.

Authors

  • Colten Peterson

    Southeast Missouri State University

  • Swapan Chattopadhyay

    Gravitational Astrophysics Lab, NASA Goddard Space Flight Center, Northern Illinois University and Argonne National Laboratory, Northern Illinois University, None, Monmouth College, IL, University of California Santa Cruz, Southern Illinois University Carbondale, Argonne National Laboratory, University of Iowa, Sinop University, Bingol University, Univ of Northern Iowa, University of California, Riverside, University of Northern Iowa, University of Wisconsin, Fairfield University, North Central College

  • Swapan Chattopadhyay

    Gravitational Astrophysics Lab, NASA Goddard Space Flight Center, Northern Illinois University and Argonne National Laboratory, Northern Illinois University, None, Monmouth College, IL, University of California Santa Cruz, Southern Illinois University Carbondale, Argonne National Laboratory, University of Iowa, Sinop University, Bingol University, Univ of Northern Iowa, University of California, Riverside, University of Northern Iowa, University of Wisconsin, Fairfield University, North Central College