One, called the polar cap geopotential height anomaly, or PCH, is essentially a measure of troughs and ridges in pressure in the upper atmosphere — the high and low pressure zones familiar from television news. (sciencenews.org)
«The rapid warming of the Atlantic Ocean created high pressure zones in the upper atmosphere over that basin and low pressure zones close to the surface of the ocean,» said Prof Axel Timmermann, co-lead and corresponding author from the University of Hawaii. (dotearth.blogs.nytimes.com)
The engineered cutoff low pressure zone has remained incredibly stationary and nearly centered over the Dakota pipeline protest zone. (geoengineeringwatch.org)