EGU2020-456
https://doi.org/10.5194/egusphere-egu2020-456
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Impact of Atlantic water inflow on winter cyclone activity in the Barents Sea: Insights from coupled regional climate model simulations

Mirseid Akperov1, Vladimir A. Semenov1,2, Igor I. Mokhov1,3, Wolfgang Dorn4, and Annette Rinke4
Mirseid Akperov et al.
  • 1A.M. Obukhov Institute of Atmospheric Physics, RAS, Mowcow, Russia, (aseid@ifaran.ru)
  • 2Institute of Geography, RAS, Moscow, Russia
  • 3Lomonosov Moscow State University, Moscow, Russia
  • 4Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany

The impact of the Atlantic water inflow (AW inflow) into the Barents Sea on the regional cyclone activity in winter is analyzed in 10 ensemble simulations with the coupled Arctic atmosphere-ocean-sea ice model HIRHAM-NAOSIM for the 1979–2016 period. The model shows a statistically robust connection between AW inflow and climate variability in the Barents Sea. The analysis reveals that anomalously high AW inflow leads to changed baroclinicity in the lower troposphere via changed static stability and wind shear, and thus favorable conditions for cyclogenesis in the Barents/Kara Seas. The frequency of occurrence of cyclones, but particularly of intense cyclones, is increased over the Barents Sea. Furthermore, the cyclones in the Barents Sea become larger (increased radius) and stronger (increased intensity) in response to an increased AW inflow into the Barents Sea, compared to years of anomalously low AW inflow.

The authors acknowledge the support by the Russian-German project funded by the Federal Ministry of Education and Research of Germany and Ministry of Science and Higher Education of the Russian Federation (grant 05.616.21.0109 (RFMEFI61619X0109)).

How to cite: Akperov, M., Semenov, V. A., Mokhov, I. I., Dorn, W., and Rinke, A.: Impact of Atlantic water inflow on winter cyclone activity in the Barents Sea: Insights from coupled regional climate model simulations, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-456, https://doi.org/10.5194/egusphere-egu2020-456, 2019

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