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Descripción

In the framework of atmospheric circulation regimes, we study whether the recent Arctic sea ice loss and Arctic Amplification are associated with changes in the frequency of occurrence of preferred atmospheric circulation patterns during the extended winter season from December to March. To determine regimes we applied a cluster analysis to sea-level pressure fields from reanalysis data and output from an atmospheric general circulation model. The specific set up of the two analyzed model simulations for low and high ice conditions allows for attributing differences between the simulations to the prescribed sea ice changes only. The reanalysis data revealed two circulation patterns that occur more frequently for low Arctic sea ice conditions: a Scandinavian blocking in December and January and a negative North Atlantic Oscillation pattern in February and March. An analysis of related patterns of synoptic-scale activity and 2 m temperatures provides a synoptic interpretation of the corresponding large-scale regimes. The regimes that occur more frequently for low sea ice conditions are resembled reasonably well by the model simulations. Based on those results we conclude that the detected changes in the frequency of occurrence of large-scale circulation patterns can be associated with changes in Arctic sea ice conditions. (C) 2017 The Authors. Published by Elsevier B.V.

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Hokkaido University Collection of Scholarly and Academic Papers  

Autor(es)

Crasemann, Berit -  Handorf, Doerthe -  Jaiser, Ralf -  Dethloff, Klaus -  Nakamura, Tetsu -  Ukita, Jinro -  Yamazaki, Koji - 

Id.: 70913335

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Palabras claveAtmospheric circulation regimes - 

Tipo de recurso: article  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: © 2017, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

Requerimientos técnicos:  Browser: Any - 

Fecha de contribución: 24-ene-2018

Contacto:

Localización:
* Polar Science, 14: 9-20

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