I am a student and I have a very simple and yet important question about reanalysis data. Recently, I attended a workshop where various other students discussing the use of ERA5 reanalysis data on their research and at some point, there was the question : "what does the use of reanalysis data means for your research and how this type of data can impact your results?" Nobody had a satisfying answer and now, I am trying to find papers discussing this issue.
For example, can someone use ERA5 parameters on a random forest model as explanatory variables and if so, what does it means for the results?
Apologies if it is a very basic question, I am new in this area.