Hi all. I'm reading up on types of atmospheric motion, and when discussing the meridional transport of various properties, the motion is generally split into three components: 1. Mean meridional circulation 2. Transient eddies 3. Stationary waves However, depending on what book, article or website I read, I come across the terms transient eddies, stationary eddies, travelling waves, stationary waves and non-travelling waves. Is this just a case of different terminology for the same thing, or are there specific differences? Are transient eddies and travelling waves the same? Are stationary eddies, stationary waves and non-travelling waves the same? Thanks in advance!