Comments 1 to 2:

1. citizenschallenge at 01:28 AM on 1 February, 2019

   Ari, thanks for continuing with this thankless task.  It is important!

   But I'm here to ask a question: would you know the first time the PDO was incorporated into climate models?

   I'm asking because I've read recent claims that climate models do not incorporate the PDO.  I can imagine that perhaps long-term models may not incorporate the PDO because it's actually irrelevant to what they are looking at (since the PDO only pushes heat around).  But, that's personal guessing.  

   Just seems to me the PDO has been studied a great deal and that the accumulating information would have been plugged into climate models - and if not, there's probably a good explanation that I would love to learn about.

   But I don't know, I'm no scientist, though I do try to keep up with their findings.

   Ari, can you (or anyone else) add any clarifying details?

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2. Ari Jokimäki at 17:45 PM on 1 February, 2019

   PDO should be there right after ocean component is added to the climate models (the result is so-called coupled atmosphere-ocean general circulation model, AOGCM). First of these were probably done some time in 1960s-1970s. I think that there's no need to incorporate the PDO separately but it arises naturally from the model simulations.

   Here is a paper from 1968 by Bryan & Cox discussing an ocean model: https://journals.ametsoc.org/doi/abs/10.1175/1520-0469(1968)025%3C0945:ANMOAO%3E2.0.CO%3B2

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