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Hello, Manually downloading MERRA 2 files from GES DISC I appear to have identified the issue. The URL changes between decades with post 2011 files having MERRA2_400 while the 2000s uses MERRA2_300 and I believe the 1990s uses MERRA2_200 and 1980s uses MERRA2_100. Changing that in my URL generation ...

Hello, I am attempting to download a number of variables from the MERRA-2 dataset. I am using R to download using GET as I have done before however for some reason I cannot download data before January 2011. Doing so yields a status code 404. Even manually putting the URL into my web browser yields ...

Thank you very much for your answer and clarification. I am wondering where this is stated or is the usage of height above ground level implicit in the calculation of PBLH?

Apologies I should have specified I was looking at the MERRA-2 dataset. Looking at the paper you provided it seems to use geopotential height which is based on sea level.

I am currently looking at the height of the Planetary Boundary Layer in order to study its impact on pollution. I am just wondering whether the height in meters is relative to sea level or to the first observed layer? I have searched through documentation but cannot find an answer. This is important...

Hello. I apologise if this is a simple question but I am wondering whether the coordinates in MERRA-2 correspond to the centre of the 0.625° x 0.5°grid? Is there anywhere in the documentation where this is explicitly stated?

Thank you very much for your quick response that FAQ page answers many of my questions however I am still wondering the reason why what values are missing are time dependant. In the FAQ page it states: "There are some regions and pressure levels where the number of valid values may be available...

Hello, I am an applied economics student seeking to study the effects of pollution using temperature inversions. I apologise for any lack of meteorological and physics knowledge I may be demonstrating. As a part of it I am using the MERRA-2 data set to measure temperature inversions specifically M2I...