Atmospheric feedbacks on Arctic summer sea-ice anomalies in ensemble simulations of a coupled regional climate model

作     者：Annette RINKE Dorthe HANDORF Wolfgang DORN Klaus DETHLOFF John C.MOORE Xiangdong ZHANG 

作者机构：Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Potsdam 14473 Germany College of Global Change and Earth System Science Beijing Normal University Beijing 100875 China International Arctic Research Center University of Alaska Fairbanks Alaska 99775 USA 

出 版 物：《Advances in Polar Science》 (极地科学进展（英文版）)

年 卷 期：2018年第29卷第3期

页      面：156-164页

学科分类：07[理学] 0707[理学-海洋科学] 0706[理学-大气科学] 

基　　金：supported by the SFB/TR172 “Arctic Amplification:Climate Relevant Atmospheric and Surface Processes,and Feedback Mechanisms (AC)” funded by the Deutsche Forschungsgemeinschaft (DFG) supported by the project QUARCCS “Quantifying Rapid Climate Change in the Arctic:Regional feedbacks and large-scale impacts” funded by the German Federal Ministry for Education and Research (BMBF) 

主　　题：Arctic climate atmosphere-sea ice feedback regional climate modeling Arctic atmosphere 

摘      要：Ensemble simulations with the Arctic coupled regional climate model HIRHAM-NAOSIM have been analyzed to investigate atmospheric feedbacks to September sea-ice anomalies in the Arctic in autumn and the following winter. Different ＂low- minus high ice＂ composites have been calculated using selected model runs and different periods. This approach allows us to investigate the robustness of the simulated regional atmospheric feedbacks to detected sea-ice anomalies. Since the position and strength of the September sea-ice anomaly varies between the different ＂low- minus high ice＂ composites, the related simulated atmospheric patterns in autumn differ depending on the specific surface heat flux forcing through the oceaaa-atmosphere interface. However, irrespective of those autumn differences, the regional atmospheric feedback in the following winter is rather insensitive to the applied compositing. Neither the selection of simulations nor the considered period impacts the results. The simulated consistent large-scale atmospheric circulation pattern show-s a wave-like pattern with positive pressure anomaly over the region of the Barents/Kara Seas and Scandinavia/western Russia （＂Scandinavian-Ural blocking＂） and negative pressure anomaly over the East Siberian/Laptev Seas.