Abstract
The cases of polar lows (PLs) over the Norwegian and Barents seas in 2013, in the vicinity of Severnaya Zemlya in 2015, and in the near-edge zone of the Laptev Sea in 2021 were analyzed using the reanalysis and the WRF-ARW model simulations. A combination of criteria was selected that are sufficient for identifying PLs and analyzing their size and intensity in a convenient and understandable form. These criteria are the estimates of helicity as an integral characteristic related to integral vortex formations and a kinematic vorticity number. Such criteria can be used to simplify the time-consuming procedure for collecting primary data on PL cases for machine learning.
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