Reconciling Roles of External Forcing and Internal Variability in Arctic Sea Ice Change on Different Time Scales

Author:

Shen Zili1,Duan Anmin2ORCID,Zhou Wen13ORCID,Peng Yuzhuo2,Li Jinxiao4

Affiliation:

1. a Key Laboratory of Polar Atmosphere-Ocean-Ice System for Weather and Climate of the MOE, Department of Atmospheric and Oceanic Science and Institute of Atmospheric Science, Fudan University, Shanghai, China

2. c State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China

3. b Key Laboratory for Polar Science of the MNR, Polar Research Institute of China, Shanghai, China

4. d Shanghai Investigation, Design and Research Institute Co., Ltd., Shanghai, China

Abstract

Abstract Two large ensemble simulations are adopted to investigate the relative contribution of external forcing and internal variability to Arctic sea ice variability on different time scales since 1960 by correcting the response error of models to external forcing using observational datasets. Our study suggests that previous approaches might overestimate the real impact of internal variability on Arctic sea ice change especially on long time scales. Our results indicate that in both March and September, internal variability plays a dominant role on all time scales over the twentieth century, while the anthropogenic signal on sea ice change can be steadily and consistently detected on a time scale of more than 20 years after the 2000s. We also reveal that the dominant mode of internal variability in March shows consistency across different time scales. On the contrary, the pattern of internal variability in September is highly nonuniform over the Arctic and varies across different time scales, indicating that sea ice internal variability in September at different time scales is driven by different factors.

Funder

National Natural Science Foundation of China

Publisher

American Meteorological Society

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