Aggregating many simultaneous concentration files

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dvabry
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Joined: February 27th, 2023, 5:14 pm
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Aggregating many simultaneous concentration files

Post by dvabry »

I am exploring the idea of using HYSPLIT to simulate many active simultaneous wildfires. To do this, I have run each wildfire event individually (with each event being run in parallel over a distributed cluster). The result is many concentration files which overlap in both time and space. I need to be able to combine these files into a single gridded set of concentration time series.

I have attempted to use conmerge to do this, however I have not been able to get it to work -- perhaps because there are too many files? It has worked for smaller subsets of the output files, but not the full batch. Instead, I have converted my output files to netCDF at the end of each parallel process so that I can attempt to combine them manually.

My question: what is the correct way to sum concentration files? Is it a literal sum of concentration along the process dimension of my array? When I try this, I get very very large concentration values and I'm concerned that the correct approach might not be a simple linear sum.

It may also simply be the settings I have used -- having taken the wildfire example as a template.
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