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Spatial and temporal distributions of absorbing aerosols along the U.S. East Coast
Lide
Jiang, CIRA @ NOAA/NESDIS/STAR, lide.jiang@noaa.gov
(Presenter)
The current atmospheric correction algorithm for ocean color products uses weakly- or non-absorbing aerosol models to derive aerosol contributions to the top of atmosphere (TOA) radiances. Therefore, the atmospheric correction algorithm tends to significantly over-estimate aerosol radiance contributions and under-estimate satellite-derived normalized water-leaving radiances at blue bands 412 and 443 nm when strongly absorbing aerosols are present. This will often result in negative normalized water-leaving radiance values at those bands. To address this problem, the first step is to correctly identify the pixels under the influence of strongly absorbing aerosols. Eight years of MODIS-Aqua L1B images located along the U.S. east coastal region have been analyzed, and the absorbing aerosol index developed by Shi and Wang (2007) was calculated. The results show strong seasonal and interannual variations in the appearance of strongly absorbing aerosols along the U.S. East Coast. Also, the spatial and temporal patterns for the pixels that are identified as contaminated by strongly absorbing aerosols are consistent with those of pixels for which values of MODIS-derived normalized water-leaving radiance at 412 nm are negative. Presentation: 2011_Poster_Jiang_39_117.pdf (509k) Presentation Type: Poster Session: Coupled Processes at Land-Atmosphere-Ocean Interfaces (Mon 4:00 PM) Associated Project(s):
Poster Location ID: 39
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