Table showing percentage of total variance explained by each of the first five principal components by Northern Hemisphere circumpolar vortex (NHCPV) area, NHCPV circularity ratio (Rc), and five atmospheric teleconnection indices.
Percentage of total variance explained by each of the first five principal components by Northern Hemisphere circumpolar vortex (NHCPV) area, NHCPV circularity ratio (Rc), and five atmospheric teleconnection indices, at the daily time scale, for the periods of available records of teleconnection indices (January 1979 to September 2017 for the AO, NAO, and PNA pattern, January 1991 through December 2017 for the SOI, and January 1990 through December 2017 for the Niño3.4). The numerals in parentheses across the columns indicate the total percentage of dataset variance explained by the principal components. Credit: Bushra and Rohli [2021], Figure 2
Editors’ Highlights are summaries of recent papers by AGU’s journal editors.
Source: Earth and Space Science

The use of an index isohypse and monthly-averaged data to represent the Northern Hemispheric circumpolar vortex (NHCPV) may oversimplify analyses, especially for identifying meteorological impacts. Bushra and Rohli [2021] adopt the technique from a recent study to delineate the NHCPV at a daily-scale and suggests that the daily NHCPVs are even more closely related to the variability in some air-sea teleconnections. A principal components analysis affirms this relation can be useful for future weather prediction at the daily scale.

This is an interesting paper that may encourage others to look at the daily connections between the NHCPV area and waviness with major atmospheric flow patterns − where the so-called extratropical Arctic Oscillation and the related North Atlantic Oscillation – are strongly correlated and the tropical El Niño/Southern Oscillation phenomenon is less directly associated. The connections between major modes of circulation are quite important to our fuller understanding of the atmosphere.

Citation: Bushra, N., & Rohli, R. V. [2021]. Relationship between atmospheric teleconnections and the Northern Hemisphere’s circumpolar vortex. Earth and Space Science, 8, e2021EA001802. https://doi.org/10.1029/2021EA001802

—Jonathan H. Jiang, Editor, Earth and Space Science

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