1111 Application of Aura OMI L2G Products Compared with NASA MERRA-2 Assimilation

Wednesday, 10 January 2018
Exhibit Hall 3 (ACC) (Austin, Texas)
Jian Zeng, NASA Goddard Space Flight Center/ADNET Systems, Greenbelt, MD; and S. Shen, J. E. Johnson, J. Wei, and D. Meyer

Ozone Monitoring Instrument (OMI) is one of the instruments aboard NASA's Aura mission. It measures ozone total column and vertical profile, aerosols, clouds, and the trace gases including NO2, SO2, HCHO, BrO, and OClO using UltraViolet electromagnetic spectrum (280 - 400 nm) . OMI Level-2G (L2G) products are based on the pixel level OMI granule satellite measurements storing within the global 0.25º × 0.25º grids, therefore they are conserving all the Level-2 (L2) spatial and temporal details of 24 hours scientific data in one file. The second Modern-Era Retrospective analysis for Research and Applications (MERRA-2) is NASA's atmospheric reanalysis using an upgraded version of Goddard Earth Observing System Model, version 5 (GEOS-5) data assimilation system. MERRA-2 includes aerosol data reanalysis and improved representations of stratosphere ozone, compared with its predecessor MERRA, in instantaneous and time-averaged collections. It is found that simply comparing satellite Level-3 products might cause biases due to lack of detailed temporal and original retrieval information and it has been preferred to inter-compare or implement satellite derived physical quantity directly with/to model assimilation with higher temporal and spatial resolution as possible. This study will demonstrate the utilization of OMI L2G daily aerosol and ozone products by comparing with MERRA-2 hourly aerosol/ozone simulations matched in both space and time aspects.

Both OMI and MERRA-2 products are accessible online through NASA Goddard Earth Sciences Data Information Services Center (GES DISC).

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