It’s a beautiful place!

Do you need some WD40?

Disclaimer: It feels like the post description doesn’t match the article, but it was the article I wanted to repost!

You are correct - the atmosphere also has 6-year periods - they co-exist with the ones we see from the core (which we would expect to exist, as per ex. Mound and Buffett 2003).

I can recommend this recent review that interprets all these signals holistically.
doi.org/10.1007/s10712-024-09874-4

The jury is still out as to why, but I suspect it arises from the gravitational coupling between the inner core and mantle

After that, the 6 year oscillation is still clear. It is well acknowledged that such a signal exists (see, for example, Holme and de Viron, 2013;Nature, or Rosat and Gillet, 2023;PEPI).

We remove the tidal contribution from the signal using the IERS reference tides, which do a very good job. We also clean the signal of atmospheric and oceanic contributions to length-of-day.

You are correct! That is why it’s very important to subtract the zonal tides before we do any analysis ☺️🌍

Thanks for highlighting it! 🤩

This work was completed by me and one of my supervisors, Prof. Richard Holme from @liverpooluni.bsky.social

And likewise, lovely to bump into you as well! What an unlikely place to meet a friendly face!

There’s no bag yet, but at least I’ve got fresh clothes now… see how long it’ll take KLM to find it!

Hope you’ll have a great rest-of-your holiday!