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Vertical Helicity Flux as an Index of General Atmospheric Circulation

Authors
  • Kurgansky, M. V.1, 2
  • Maksimenkov, L. O.1
  • Khapaev, A. A.1
  • Chkhetiani, O. G.1, 3
  • 1 Russian Academy of Sciences, Obukhov Institute of Atmospheric Physics, Moscow, 119017, Russia , Moscow (Russia)
  • 2 Moscow State University, Faculty of Physics, Moscow, 119991, Russia , Moscow (Russia)
  • 3 Russian Academy of Sciences, Space Research Institute, Moscow, 117997, Russia , Moscow (Russia)
Type
Published Article
Journal
Doklady Earth Sciences
Publisher
Pleiades Publishing
Publication Date
Apr 01, 2018
Volume
479
Issue
2
Pages
477–481
Identifiers
DOI: 10.1134/S1028334X18040037
Source
Springer Nature
License
Yellow

Abstract

As an index of the general atmospheric circulation over the hemisphere, it is proposed to calculate the hemisphere-area-averaged (poleward of the latitude 20°) product of the Coriolis parameter by the wind velocity squared at the upper boundary of the planetary boundary layer. In practical calculations, data on the wind velocity at an isobaric level of 850 hPa were used. Control calculations for the 900 hPa level gave similar results. It is shown that the index introduced adequately characterizes the seasonal and interannual variability of the general atmospheric circulation over both hemispheres.

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