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Thank you Jim. Have you already heard back? As 2020 has come to an end, the average annual concentrations will come available soon. It will be great to have more insight into the details behind the data. I worked on analysis of the Anthropogenic SO2 Emissions (M2TMNXADG v5.12.4), comparing different...

Thank you Jim, Have you already received a response? The main questions I have are the following: -(How) can MERRA-2 be used to assess the impact of the large scale reduction in anthropogenic aerosol, notably SOx emissions (amongst others from IMO 2020 regulation)? -Is MERRA-2 data reliable enough t...

Find attached the comparison of 2019 and 2020 for the months of both March and August. It's difficult to determine the relevance, especially without more insight in the MERRA-2 model and its underlying data and assumptions. Comparing the average of for example the first half year of each year would ...

Thank you. The 77% reduction is cited from the International Maritime Organisation. See this link and attached highlights. All ships need to use low sulfur fuel (max 0.5% in stead of 3.5% sulfur fuel content) or scrubbers starting January 1st 2020. The 77% reduction translates to approximately 8.5 m...

I managed with Panoply to compare the SO2 Surface Mass Concentration ENSEMBLE data of 2010-08 with 2020-08, both Log10 and Scalar, see attached. These look almost identical, while SO2 emissions from shipping (should) have been reduced with 77%. What could cause this similar image?

Thank you for your detailed answer Jim, The 'SO2 surface mass concentration 2010 average' is interesting, as it clearly shows the elevated concentration of SO2 across the shipping routes. What will be the most user friendly software to make similar comparisons analyses for comparing periods (for exa...

Thank you for the clear Earthdata Webinar, I am interested in past, present and future NASA GES DISC data and data from Barbados on sulfates over and from the Atlantic attributed to emissions from shipping. New regulation from the International Maritime Organisation (IMO 2020) which came into effect...