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    Intercomparison of desert dust optical depth from satellite measurements

    200709_96706_Intercomparison_of_desert_dust.pdf (7.434Mb)
    Access Status
    Open access
    Authors
    Carboni, E.
    Thomas, G.
    Sayer, A.
    Siddans, R.
    Poulsen, C.
    Grainger, R.
    Ahn, C.
    Antoine, David
    Bevan, S.
    Braak, R.
    Brindley, H.
    DeSouza-Machado, S.
    Deuzé, J.
    Diner, D.
    Ducos, F.
    Grey, W.
    Hsu, C.
    Kalashnikova, O.
    Kahn, R.
    North, P.
    Salustro, C.
    Smith, A.
    Tanré, D.
    Tanré, D.
    Torres, O.
    Veihelmann, B.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Carboni, E. and Thomas, G. and Sayer, A. and Siddans, R. and Poulsen, C. and Grainger, R. and Ahn, C. et al. 2012. Intercomparison of desert dust optical depth from satellite measurements. Atmospheric Measurement Techniques. 5: pp. 1973-2002.
    Source Title
    Atmospheric Measurement Techniques
    DOI
    10.5194/amt-5-1973-2012
    ISSN
    1867-1381
    Remarks

    This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/ Please refer to the licence to obtain terms for any further reuse or distribution of this work.

    URI
    http://hdl.handle.net/20.500.11937/42841
    Collection
    • Curtin Research Publications
    Abstract

    This work provides a comparison of satellite retrievals of Saharan desert dust aerosol optical depth (AOD) during a strong dust event through March 2006. In this event, a large dust plume was transported over desert, vegetated, and ocean surfaces. The aim is to identify the differences between current datasets. The satellite instruments considered are AATSR, AIRS, MERIS, MISR, MODIS, OMI, POLDER, and SEVIRI. An interesting aspect is that the different algorithms make use of different instrument characteristics to obtain retrievals over bright surfaces. These include multi-angle approaches (MISR, AATSR), polarisation measurements (POLDER), single-view approaches using solar wavelengths (OMI, MODIS), and the thermal infrared spectral region (SEVIRI, AIRS). Differences between instruments, together with the comparison of different retrieval algorithms applied to measurements from the same instrument, provide a unique insight into the performance and characteristics of the various techniques employed. As well as the intercomparison between different satellite products, the AODs have also been compared to co-located AERONET data. Despite the fact that the agreement between satellite and AERONET AODs is reasonably good for all of the datasets, there are significant differences between them when compared to each other, especially over land. These differences are partially due to differences in the algorithms, such as assumptions about aerosol model and surface properties. However, in this comparison of spatially and temporally averaged data, it is important to note that differences in sampling, related to the actual footprint of each instrument on the heterogeneous aerosol field, cloud identification and the quality control flags of each dataset can be an important issue.

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