Tuesday, May 21, 2024

High resolution SST and movies of critical regions

About twelve years ago I did quite a lot of work with NOAA's AVHRR data on sea surface temperature anomaly. I wrote about it here and maintained an updated page here, with an active trackball globe. I then extracted certain regions of interest and posted movies of specific periods. This required projection from the sphere onto a flat surface.

All this was prepared in R and implemented in Javascript/WebGL. It worked, but was then at the limit of my skills and computing infrastructure, and some things stopped working after a while, and were difficult to fix. So I have done a complete re-write. I think the interface is more usable, and updating will be better.

The page is here. The standard movie controls are below the image, also shown below. The regions are:
  • E for tropical Pacific, intended to show ENSO effects
  • A for Arctic, centered on Pole
  • E for Antarctic, centered on Pole
  • N for Notrh Atlantic
  • P for North Pacific

You can choose one of the time intervals stated, click a radio button, and use the movie control to start and pause. Below the selection buttons is a slider to vary the frame speed. Default is 5 Hz, but the log scale goes from 1 to 25. The last row of buttons has about 800 frames at 4 day intervals, so you may want to speed up.


  1. It's all standing waves driven by long-period tidal forces. Moreover, standing waves in a double-band structure. The annual cycle is allowing for complex patterns due to temporal Brillouin zone folding. Alas, after all these years, still no 2-way climate science forums for discussing these ideas.

  2. Nick - off topic, however the air-sea flux preprint being discussed at WUWT (I refuse to sign up) can be downloaded here


    1. Thanks, Phil,
      As I said there, I'll wait to see if it gets published. Or more realistically, if it makes a splash if and when it is published.

  3. Nick,
    your work seems deserving of extensive discussion both at the simplest and the more sophisticated level. Is this happening in some other venue?

    john ferguson

    1. Thanks, John,
      I've been surprised that it hasn't. I remember you commented in the first round of these movies. The NOAA AVHRR data itself seem to not get the attention it deserves.

      Maybe it will get more discussion when details of some ENSO type event seem important.