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(a) MODIS Terra scene over southeastern Asia showing smoke aerosols above clouds and (b) spectral TOA reflectance for 0.1° boxes centered around a smoke-laden cloud (red crosses) and a comparatively smoke-free cloud (blue diamonds). Vertical bars in Figure 1b indicate the standard deviation of reflectance across these boxes.

New paper published about monitoring absorbing aerosols above clouds

This Figure shows (a) MODIS Terra scene over southeastern Asia showing smoke aerosols above clouds and (b) spectral TOA reflectance for 0.1° boxes centered around a smoke-laden cloud (red crosses) and a comparatively smoke-free cloud (blue diamonds). Vertical bars in Figure 1b indicate the standard deviation of reflectance across these boxes.

 

MODIS AOD map created by Giovanni

MODIS Collection 6 aerosol products now on Giovanni visualization tool

We are pleased to report that the latest update to NASA’s Giovanni visualization portal now includes MODIS Collection 6 aerosol products, including Deep Blue. Giovanni provides a quick and easy way to look at our Level 3 data sets, as well as many other geophysical data sets, without having to download the files yourself.

 

Paper about MODIS Terra Deep Blue Collection 6 validation and stability

This figure shows the global over land area-weighted time series of DB (a) AOD at 550 nm and (b) AOD anomaly and decadal trends, from MODIS Terra (red) and Aqua (blue), and (c) the time series and decadal trend in the Terra-Aqua AOD difference. Uncertainties in calculated trends are presented as 90% confidence intervals.

 

Figure 10 from paper, showing mitigation of bow-tie distortion

Paper about the MODIS bow-tie distortion and effect on aerosol retrievals

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.

Case study of the ASHE algorithm over North America

Paper about aerosol height and single scattering albedo retrieval

Application of the aerosol single-scattering albedo and height estimation (ASHE) algorithm to a smoke event observed over North America on 16 July 2014. (a) VIIRS RGB image with MODIS/Aqua fire mask in red dots, (b) VIIRS Deep Blue AOD, (c) OMPS UVAI, (d) retrieved SSA and (e) ATH from ASHE, and (f) CALIOP total attenuated backscatter profile with CALIOP-derived (black circle) and ASHE-retrieved aerosol heights (cyan circle).

Example of the merging process for a MODIS Aqua granule over the Sahel.

Paper about MODIS Collection 6 Deep Blue, Dark Target, and 'merged' data sets

Example of the merging process for a MODIS Aqua granule over the Sahel. (a) A true-color image and (b) the algorithms selected for each individual retrieval . (c–e) Deep Blue (DB), Dark Target (DT) land/ocean, and merged AOD, respectively. Regions in grey lack valid AOD retrievals.