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Hi there,

I am using ERA5Land 2m temperature and dewpoint 2m temperature, in hourly measure, to calculate the near-ground or 2m Relative Humidity.

From this topic I can see that the formula to obtain the Relative Humidity will be basically the ratio between saturation vapor pressures:

RH = e/ES*100,

Where e is the saturation vapor pressure for the dewpoint temperature and Es is the saturation vapor pressure at temperature T.

I am processing the ERA5Land files in R, and they can as ".nc", and I read them as RasterBricks objects, the problem is, to do this calculation is basically not practicable in a laptop.
My laptop is quite robust, it has 32 GB of RAM and 12 Threads, but even though it is still crashes all the time that I try to calculate the Relative Humidity for a whole year, I have to do this for 12 years.

I was able to do the calculation using this formulas for a bunch of layers like 1 day, 2 days or even a month, but it takes like 5 minutes to run for a month for example, the way I did it is basically doing the calculations
on each layer, even if I parallelized it is not speed up considerably.

Any guesses or help to do this calculation faster? I am open to any other software or way to process it.

Thanks!