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A simple model of blocking action over a hemisphere

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Abstract

A two-zone model of the atmospheric circulation over a hemisphere is considered. The latitude φ of the boundary between the zone of the Rossby circulation regime at mid and high latitudes and the zone of the Hadley circulation regime at low latitudes serves as a model variable. The principle of maximum of the (information) entropy of the eddy regime within the Rossby regime zone is used to determine a statistical (climatic) equilibrium value of φ. Based on the proposed model, the question of atmospheric blocking action over the hemisphere is addressed. An attempt has been made to represent a blocking phenomenon as a necessary attribute of the atmospheric circulation in statistical equilibrium. The model suggests that long-term climate change related either to the (significant) global warming or to the (significant) global cooling, both respective to the current climate state, and quantified in terms of changes in latitude φ, leads to an increase in the probability of blocking action.

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Fig. 1

Adapted from Flohn (1974); see also Kurgansky (2018)

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Notes

  1. The phenomenon of atmospheric blocking attracted the author’s attention since the work on joint publication (Obukhov et al. 1984), in the aftermath of severe summer droughts of 1972, 1975, and 1981 in the former USSR.

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Funding

This work was supported by the Russian Science Foundation, grant no. 18–47-06203.

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Correspondence to M. V. Kurgansky.

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Kurgansky, M.V. A simple model of blocking action over a hemisphere. Theor Appl Climatol 147, 65–71 (2022). https://doi.org/10.1007/s00704-021-03782-y

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  • DOI: https://doi.org/10.1007/s00704-021-03782-y

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