The Spot grew a little taller as it shrank

The storm has been shrinking for a century and a half. As it gets smaller it is growing taller. First confirmed sighting 1831; a long record from 1878. Combined with Voyager and Hubble OPAL. Simon and colleagues.

Researchers expected internal winds to spin faster as the oval contracted. Instead of spinning faster, the storm appears to be forced to stretch up. Color deepened to intensely orange since 2014, possibly chemicals carried higher and exposed to more UV.

Paper I keeps this as a weather-layer shape change. It is not a mass measurement below about 100 bars.