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Hi Michael,
Thank you for your interest in MERRA-2 data. To better assist with your request regarding data download could you please send an email to the NASA GES DISC Help Desk,
at gsfc-help-disc@lists.nasa.gov thank you

Thank you for your interest in MERRA-2 data. To better assist with your request regarding data download could you please send an email to the NASA GES DISC Help Desk,
at gsfc-help-disc@lists.nasa.gov thank you

Thank you for your question. A Subject Matter Expert has been notified and will answer your question shortly.
Best regards,

I am glad to inform you that the data downloading issue has been fixed. Could
you please try again. Please let us know if you have any further questions.

correction to the email address.
gsfc-help-disc@lists.nasa.gov

Dear TRMM data user,
To better assist you could you please send an email to the NASA GES DISC Help Desk, at help-disc-gsfc@lists.nasa.gov thank you

The variables 'PixelCornerLatitudes' and 'PixelCornerLongitudes' contain the coordinates of the corners of each pixel. The corner locations fall on either side of the pixel centers, which are defined in the geolocation variables 'Longitude' and 'Latitude' having the dimensions nTimes and nXtrack. Ex...

I want to provide feedback about the subset data download for OMHCHO V003 data. In the data subset, almost all the variables are cropped, but the corner points of latitude and longitude (e.g. PixelCornerLatitudes and PixelCornerLongitudes) are not cropped. Hence, they have a different dimension size...

At the GES DISC we have individual mailing list for various missions and projects.
However we do have an alert page where users can find information on updates on data products and services.
See link below.
https://disc.gsfc.nasa.gov/information/alerts

In regards to your request, the negative SO2 values are artifacts of the retrieval process. They are usually associated with retrievals over highly reflective surfaces. The OMSO2.003 readme has more detail than is contained in the OMSO2e readme: https://aura.gesdisc.eosdis.nasa.gov/data/Aura_OMI_Lev...