Illustration of the effects of aggregation technique on spatial distribution of retrieved DB AOD at 550 nm near the edge of a MODIS swath. Panel (a) shows a true-color image; panel (b) shows the AOD using the standard level 2 aggregation technique, while (c) and (d) show the result of techniques designed to increasingly mitigate the effects of the bow-tie distortion on the data. Panel (d) clearly shows the greatest similarity in structure between the AOD features/cloud gaps with the true-color image. Pixels without retrievals are shaded in gray.
We are pleased to announce the publication of a new paper about the implications of the MODIS sampling distortion known as the ‘bow-tie’ effect on aerosol optical depth (AOD) retrievals. The paper explains and illustrates the origins and effects of this distortion, which leads to an across-track variability in AOD retrieval pixel size, shape, and overlap, as well as some ways which the distortion could be mitigated in future versions of aerosol data products such as Deep Blue (and others).
The reference for the paper is as follows:
Sayer, A. M., N. C. Hsu, C. Bettenhausen (2015), Implications of MODIS bow-tie distortion on aerosol optical depth retrievals, and techniques for mitigation, Atmos. Meas. Tech., 8, 5277-5288, doi:10.5194/amt-8-5277-2015.