Jan, Saw your [comment attached to the Antarctic Ice sheet melting post over at RC](http://www.realclimate.org/index.php/archives/2019/08/the-antarctic-ice-sheet-is-melting-and-yeah-its-probably-our-fault) and responded, waiting for it to come out of moderation.

![](https://imagizer.imageshack.com/img922/9829/0QZBS4.png)

I summarized the findings of common-mode forcing here: https://geoenergymath.com/2019/08/12/ao-pna-and-sam-models/

The RC post is saying that variability in ice sheet melting is linked to ENSO. SAM is located right off Antarctica, and has that connection to ENSO via the common-mode tidal forcing.