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Climate Dynamics

, Volume 50, Issue 11–12, pp 4303–4322 | Cite as

The Eurasia–North Pacific Oscillation in atmospheric mass variations independent of both IHO and AO and its possible impacts on winter climate

Article

Abstract

Using NCEP/NCAR reanalysis, we have investigated the features of migrations of atmospheric mass (AM) between land and ocean in Eurasia–North Pacific domain in boreal winter after having both signals of Inter-hemispheric Oscillation and Arctic Oscillation removed from the physical quantities. It is found that there is a Eurasia–North Pacific Oscillation (ENPO) in surface air pressure anomalies. This ENPO pattern characterizes with two oppositely signed anomalous surface pressure centers over Eurasia and North Pacific respectively, indicating strong connections between Siberian high and Aleutian low during period 1979–2012. The maintenance of this ENPO teleconnection is significantly associated with three factors including the anomalous AM flows and zonal circulation cell over Eurasia–North Pacific domain, the Rossby wave energy propagations, and the thermal forcing contrasts near the surface between Eurasia and North Pacific during boreal winter. The variations of both wintertime rainfall and temperature over Eurasia may be strongly affected by ENPO. When the ENPO index is positive (negative), there occurs the AM accumulation (depletion) over Eurasia with simultaneous depletion (accumulation) over mid-latitude North-Pacific. Correspondingly, this anomalous surface pressure pattern along with the related circulation anomalies at different isobaric levels possibly results in winter precipitation decreases (increases) over Siberian Plain and East China, whereas increases (decreases) over southeastern Europe, Xinjiang of China, and the west coast of Sea of Okhotsk. On the other hand, surface air temperature decreases (increases) over large areas of Eurasia. These results are helpful for our better understanding the mechanisms behind circulation and winter climate variations over Eurasia–North Pacific region.

Keywords

Tele-connection Atmospheric mass Eurasia–North Pacific domain Winter climate anomalies 

Notes

Acknowledgements

The authors are very grateful to the anonymous reviewers for their helpful comments. NCEP/NCAR reanalysis data used here are obtained from the NOAA-CIRES Climate Diagnosis Center accessible at http://www.esrl.noaa.gov. This work is supported jointly by the National Natural Science Foundation of China (41175062 and 41330425) and PAPD project of Jiangsu Province. Q. Zhang is also supported by the Creative Program of Science and Technology of Jiangsu (KYZZ_0239). Graphs are plotted using the software GrADS and NCL.

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)Nanjing University of Information Science and TechnologyNanjingChina

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