Long-Period Lunar Perturbations in Earth Pole Oscillatory Process: Theory and Observations

Крылов, С. С.; Perepelkin, V. V.; Filippova, A. S.

doi:10.1007/978-981-15-2600-8_22

Cited by 5 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We know that the heat coming from the Sun's activity varies with time (e.g., [9][10][11][12][13][14][15][16][17][18]) and so does the inclination of our planet's rotation axis (e.g., [19][20][21][22][23][24][25][26][27][28]). Consequences of these two variabilities are expected to affect the atmosphere, and in particular the climate (e.g., [10,13,14,19,22,[29][30][31][32][33][34][35][36][37][38][39][40]).…”

Section: Introductionmentioning

confidence: 99%

Triskeles and Symmetries of Mean Global Sea-Level Pressure

2022

View full text Add to dashboard Cite

The evolution of mean sea-level atmospheric pressure since 1850 is analyzed using iterative singular spectrum analysis. Maps of the main components (the trends) reveal striking symmetries of order 3 and 4. The Northern Hemisphere (NH) displays a set of three positive features, forming an almost perfect equilateral triangle. The Southern Hemisphere (SH) displays a set of three positive features arranged as an isosceles triangle, with a possible fourth (weaker) feature. This geometry can be modeled as the Taylor–Couette flow of mode 3 (NH) or 4 (SH). The remarkable regularity and three-order symmetry of the NH triskeles occurs despite the lack of cylindrical symmetry of the northern continents. The stronger intensity and larger size of features in the SH is linked to the presence of the annular Antarctic Oscillation (AAO), which monitors the periodic reinforcement and weakening of the circumpolar vortex; it is a stationary mode. These components represent 70% of the variance in total pressure since 1850 and are stable in both time and space. In the remaining 30% of the variance, we have extracted quasi-periodical components with periods larger than 1 year (2% of the variance) and a harmonic sequence of the 1-year period (20% of the variance).

show abstract