12A.4 Long-Term Global SOData Record from Aura/OMI: Latest Updates, Recent Applications, and Comparisons with TROPOMI

Thursday, 10 January 2019: 2:15 PM
North 124A (Phoenix Convention Center - West and North Buildings)
Can Li, Univ. of Maryland, College Park, MD; and N. A. Krotkov, J. Joiner, N. Theys, S. Carn, Y. Zhang, V. Fioletov, and C. McLinden

Since launched aboard NASA’s Aura spacecraft in 2004, the Dutch/Finnish Ozone Monitoring Instrument (OMI) has been providing global observations of anthropogenic and volcanic SO2. The standard OMI SO2 data, produced at NASA Goddard Space Flight Center, have been used in a number of studies on SO2 emissions and transport, as well as in everyday applications such as aviation disaster avoidance. The current OMI SO2 data are based on a principal component analysis (PCA) retrieval technique that significantly reduces the noise and artifacts in retrievals, leading to improved sensitivity to SO2 emission sources. In this presentation, we offer an overview of the latest updates that are being made to further improve the OMI SO2 product. In particular, we will discuss the implementation of a new SO2 Jacobians lookup table that allows us to more accurately estimate the instrument sensitivity to SO2 for each individual pixel. We show that, the new lookup table, along with more realistic a priori SO2 profiles, help to further improve the accuracy of SO2 retrievals. We also highlight a few recent examples using OMI SO2 data in research and applications. One such example is the use of OMI SO2 data to study long-range transport of pollution out of East Asia. Another example is the use of OMI and other satellite data to monitor the air quality impact of the 2018 Kilauea eruption in Hawaii. Finally, we also make comparisons between the OMI SO2 data and the first results from TROPOMI. We show that the two data products are largely consistent despite differences in both algorithms and instrument characteristics. This demonstrates the potential to extend and enhance the OMI SO2 data record using TROPOMI.
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