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    Estimation of aerosol altitude from reflectance ratio measurements in the O2 A-band

    Access Status
    Fulltext not available
    Authors
    Dubuisson, P.
    Frouin, R.
    Duforêt, L.
    Dessailly, D.
    Voss, K.
    Antoine, David
    Date
    2006
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Dubuisson, P. and Frouin, R. and Duforêt, L. and Dessailly, D. and Voss, K. and Antoine, D. 2006. Estimation of aerosol altitude from reflectance ratio measurements in the O2 A-band, in Robert J. Frouin; Vijay K. Agarwal; Hiroshi Kawamura; Shailesh Nayak; Delu Pan (ed), SPIE 5th Asia-Pacific Remote Sensing Symposium, Nov 13 2006, pp. 640602-1-640602-10. Goa, India: SPIE.
    Source Title
    Proceedings of the SPIE, Volume 6406, Remote Sensing of the Marine Environment, 640602
    Source Conference
    SPIE 5th Asia-Pacific Remote Sensing Symposium
    DOI
    10.1117/12.697968
    Additional URLs
    http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1295203
    ISSN
    0277-786X
    URI
    http://hdl.handle.net/20.500.11937/15465
    Collection
    • Curtin Research Publications
    Abstract

    A methodology is presented to estimate aerosol altitude from reflectance ratio measurements in the O2 absorption Aband. Previous studies have shown the impact of the vertical distribution of scatterers on the reflectance ratio. The reflectance ratio is defined as the ratio of the reflectance in a first spectral band, strongly attenuated by O2 absorption, to the reflectance in a second spectral band, minimally attenuated. First, a sensitivity study is performed to quantify the expected accuracy for various aerosol loadings and models. An accurate, high spectral resolution, radiative transfer model that fully accounts for interactions between scattering and absorption is used in the simulations. Due to their adequate spectral characteristics, POLDER and MERIS instruments are considered for simulations. For a moderately loaded atmosphere (i.e., aerosol optical thickness of 0.3 at 760 nm), the expected error on aerosol altitude is about 0.3 km for MERIS and 0.7 km for POLDER. More accurate estimates are obtained with MERIS, since the spectral reflectance ratio is more sensitive. Second, the methodology is applied to MERIS and POLDER imagery. Estimates of aerosol altitude are compared with lidar profiles of backscattering coefficient acquired during the AOPEX-2004 experiment. Retrievals are consistent with measurements and theory. These comparisons demonstrate the potential of the differential absorption methodology for obtaining information on aerosol vertical distribution.

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