Actually, no it isn't necessary because there is no data. A 2nd grader could tell you that Trenberth's energy graph is a work of pure fiction once he knows there's no data behind it. Before you can calculate the standard deviation of the data you actually have to have some data. Otherwise, you're doing a magic show.
This
IS an ESL problem, isn't it. You're really doing an admirable job, but it's time to admit that you're not working in your native tongue.
From "Distinctive climate signals": "ORAS4 has been produced by combining,
every 10 days, the output of an ocean model forced by atmospheric reanalysis fluxes
and quality controlled ocean observations."
Please let us know if you're unable to follow that statement. It's a bit technical for a non-native speaker such as yourself.