Geopotential refers to the gravitational potential energy of an object due to its position in the Earth's gravitational field. It measures the strength of Earth's gravity at different locations on the planet's surface.
The below normal / cold PCHs in the troposphere are consistent with the negative geopotential height anomalies predicted across the Arctic and the positive AO for the coming week (Figure 1). (aer.com)
More seasonably cool temperatures are expected in Northeastern Canada (Figure 3) where troughing / negative geopotential height anomalies are predicted to persist (Figure 2). (aer.com)
East Asian ridging / positive geopotential height anomalies are predicted to persist (Figure 2). (aer.com)