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The Role of Underlying Boundary Forcing in Shaping the Recent Decadal Change of Persistent Anomalous Activity over the Ural Mountains

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Abstract

Observational analyses demonstrate that the Ural persistent positive height anomaly event (PAE) experienced a decadal increase around the year 2000, exhibiting a southward displacement afterward. These decadal variations are related to a large-scale circulation shift over the Eurasian Continent. The effects of underlying sea ice and sea surface temperature (SST) anomalies on the Ural PAE and the related atmospheric circulation were explored by Atmospheric Model Intercomparison Project (AMIP) experiments from the Coupled Model Intercomparison Project Phase 6 and by sensitivity experiments using the Atmospheric General Circulation Model (AGCM). The AMIP experiment results suggest that the underlying sea ice and SST anomalies play important roles. The individual contributions of sea ice loss in the Barents-Kara Seas and the SST anomalies linked to the phase transition of the Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO) are further investigated by AGCM sensitivity experiments isolating the respective forcings. The sea ice decline in Barents-Kara Seas triggers an atmospheric wave train over the Eurasian mid-to-high latitudes with positive anomalies over the Urals, favoring the occurrence of Ural PAEs. The shift in the PDO to its negative phase triggers a wave train propagating downstream from the North Pacific. One positive anomaly lobe of the wave train is located over the Ural Mountains and increases the PAE there. The negative-to-positive transition of the AMO phase since the late-1990s causes positive 500-hPa height anomalies south of the Ural Mountains, which promote a southward shift of Ural PAE.

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Acknowledgements This study was jointly supported by the National Key Research and Development Program of China (Grant No. 2018YFA0606403), the National Natural Science Foundation of China (Grant No. 41790473) and the Beijing Natural Science Foundation (8234068).

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Correspondence to Shuanglin Li.

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Article Highlights

• The occurrence frequency of a Ural persistent positive height anomaly event (PAE) experienced a decadal increase around the year 2000.

• The shift in the PDO to its negative phase and the sea ice decline in Barents-Kara Seas are conducive to the occurrence of a Ural PAE.

• The AMO shift from a negative to positive phase since the late-1990s promotes a southward shift in the location of a Ural PAE.

This paper is a contribution to the special issue on the Ocean, Sea Ice and Northern Hemisphere Climate: In remembrance of Professor Yongqi Gao’s key contributions.

Electronic supplementary material Supplementary material is available in the online version of this article at https://doi.org/10.1007/s00376-023-2365-6.

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376_2023_2365_MOESM1_ESM.pdf

The Role of Underlying Boundary Forcing in Shaping the Recent Decadal Change of Persistent Anomalous Activity over the Ural Mountains

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Lei, T., Li, S. The Role of Underlying Boundary Forcing in Shaping the Recent Decadal Change of Persistent Anomalous Activity over the Ural Mountains. Adv. Atmos. Sci. (2023). https://doi.org/10.1007/s00376-023-2365-6

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  • DOI: https://doi.org/10.1007/s00376-023-2365-6

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