Related Experiment Video
Updated: Aug 12, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils
Published on: November 18, 2022
Changing features of the Northern Hemisphere 500-hPa circumpolar vortex
Nazla Bushra1,2, Robert V Rohli1,2, Chunyan Li1,2
1Department of Oceanography and Coastal Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge, LA, United States.
Abstract:
The tropospheric circumpolar vortex (CPV), an important signature of processes steering the general atmospheric circulation, surrounds each pole and is linked to the surface weather conditions. The CPV can be characterized by its area and circularity ratio (R ), which both vary temporally. This research advances previous work identifying the daily 500-hPa Northern Hemispheric CPV (NHCPV) area, R , and temporal trends in its centroid by examining linear trends and periodic cycles in NHCPV area and R (1979-2017). Results suggest that NHCPV area has increased linearly over time. However, a more representative signal of the planetary warming may be the temporally weakening gradient which has blurred NHCPV distinctiveness-perhaps a new indicator of Arctic amplification. R displays opposing trends in subperiods and an insignificant overall trend. Distinct annual and semiannual cycles exist for area and R over all subperiods. These features of NHCPV change over time may impact surface weather/climate.
Related Concept Videos
Global Climate Change
Magnetic Declination
What is Climate?
Coriolis Force
Variation of Atmospheric Pressure
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
Magnetostatic Boundary Conditions

