![](https://imagizer.imageshack.com/img921/2429/4649pZ.png)

> from Arbic, Brian K, Matthew H Alford, Joseph K Ansong, Maarten C Buijsman, Robert B Ciotti, J Thomas Farrar, Robert W Hallberg, Christopher E Henze, Christopher N Hill, and Conrad A Luecke. [“Primer on Global Internal Tide and Internal Gravity Wave Continuum Modeling in HYCOM and MITgcm.”](https://www.aoml.noaa.gov/phod/docs/Inoue_et_al-2019-Journal_of_Geophysical_Research__Oceans.pdf) New Frontiers in Operational Oceanography, 2018, 307–92.


Look at the standing wave along the equatorial Pacific. The nodes generally align at different times corresponding to the start of a Tropical Instability Wave train. They do eventually start travelling but the caption indicates that they emerge from what looks like a relatively fixed location.

> "The six TIWs had periods ranging from 15 to 24 days, with the sixth TIW being the longest and the second and fourthTIWs being the shortest."

Having a spatially fixed standing wave pattern says nothing about what the temporal dynamics are, same as with the spatially fixed but erratic ENSO time-series.