u/BlitzenWanderer

Hello all, I've been reading through this paper, but I've been struggling to understand the equations it uses in its Data and Methods. I know what the Sigma means, but I am totally lost on the mean Land Surface Temperature which has both a superscript and a subscript. If someone could tell me what this is called and/or explain the different parts of the equations, that would be really helpful. I had to link the paper since I couldn't post the screenshots I took. Edit: I was able to provide said screenshots in the comments.