Plateau Meteorology

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2019 , Vol. 38 >Issue 4: 685 - 692

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00116

Interannual Variations of Siberian High during Boreal Winter and Its Influence on East Asian Temperature

  • ZHU Hongxia ,
  • CHEN Wen ,
  • FENG Tao ,
  • WANG Lin
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  • Department of Atmospheric Sciences, College of Resources Environment and Earth Sciences, Yunnan University, Kunming 650091, Yunnan, China;Monsoon System Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190, China;School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China;Key laboratory of atmospheric environment and processes in the boundary layer over the low-latitudeplateau region, Department of atmospheric science, Yunnan University, Kunming 650091, Yunnan, China

Received date: 2018-10-09

  Online published: 2019-08-28

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Abstract

The dominant interannual variations of Siberian high (SH) during Boreal Winter in north Asia region (40°N-60°N, 80°E-120°E) are analyzed using empirical orthogonal function (EOF) decomposition based on NCEP/NCAR monthly mean sea level pressure data from 1979 to 2017. The results show that the first EOF mode present a uniform variation over the whole region, the second mode exhibit a north-south seesaw relationship in seal level pressure change, and the third mode show a west-east seesaw relationship. In addition, the principal component time series of the three dominant modes all indicate significant interannual changes. Further analysis of the relevant atmospheric circulation pattern and East Asian temperature anomaly associated with the first mode show that the atmospheric circulation is characterized by changes in sea-land pressure gradient and related changes in East Asian trough strength and subtropical jet intensity. When SH is in negative phase, East Asia is warmer than usual, on the contrary East Asia is colder when SH is in positive phase. The second mode of SH is closely related to changes in Arctic Oscillation (AO) and North Atlantic Oscillation (NAO), where the height field shows a quasi-positive pressure north-south annular mode. When SH is strong in the north and weak in the south, the circulation pattern is similar to the AO positive phase, weakened temperate jet stream lead to warmer condition in the northeastern part of East Asia, but when SH is weak in the south, the northeastern part of East Asia is colder. The atmospheric circulation associated with the third mode mainly occurs in the local area of Eurasia, and also has a certain relationship with the North Atlantic Oscillation (NAO). When SH is strong in the east and weak in the west, the east part of East Asia is warmer and the southwest part is colder. When SH is weak in the east and strong in the west, the northeastern part of East Asia is colder and the southwest part is warmer.

Key words： Siberian High; interannual variatio; East Asian temperatu

Cite this article

ZHU Hongxia , CHEN Wen , FENG Tao , WANG Lin . Interannual Variations of Siberian High during Boreal Winter and Its Influence on East Asian Temperature[J]. Plateau Meteorology, 2019 , 38(4) : 685 -692 . DOI: 10.7522/j.issn.1000-0534.2018.00116

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