M. K. Pichugin, I. A. Gurvich
V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch of RAS, Vladivostok, Russia
Abstract
Parameters of intensive marine weather systems over the marginal seas of the Eastern sector of the Eurasian Arctic (EEA) in autumn – winter (September – December) 2014 – 2015 are studied using integrated multisensor satellite measurements. Analysis of geophysical parameters retrieved from satellite active and passive microwave measurements is showed that for period under study over the Laptev, Chukchi and East-Siberian Seas the synoptic atmospheric cyclones (the Arctic cyclones) are systematically determined with surface winds W = 15 m/s and more. However they are less intense and are smaller than extratropical cyclones of the North Pacific and Atlantic Oceans. In the rear of the separate cyclones Cold-Air Outbreaks (CAO) occurred from the ice polar cap with a maximum W = 15 – 22 m/s. CAO were accompanied by the formation of mesoscale “cloud streets”, reflecting the roll convection in the atmospheric boundary layer. Also mesoscale cyclones (MC) which are most active in October were observed over EEA marginal seas. The typical size of MC was at an everage 200 – 300 km with a maximum wind W = 14 – 16 m/s.
Keywords
the Arctic, cyclones, mesocyclones, satellite measurements, multi-sensory analysis, cold invasion, synoptic conditions