Acta Geographica Sinica ›› 2017, Vol. 72 ›› Issue (7): 1163-1172.doi: 10.11821/dlxb201707003

• Orginal Article • Previous Articles     Next Articles

The North Pacific storm track anomaly and its relationship with winter minimum temperature in Liaoning Province

Mingyan LIU(), Yiling HOU, Xiaoyu ZHOU, Xue YI, Chunyu ZHAO, Qiang GONG, Yan CUI   

  1. Regional Climate Center of Shenyang, Shenyang 110166, China
  • Received:2017-01-16 Revised:2017-03-15 Online:2017-08-07 Published:2017-08-07
  • Supported by:
    Liaoning Science and Technology Project, No.2015103038 Research Item of the Liaoning Provincial Meteorological Administration, No.201503 The Open Foundation of China Meteorological Administration Shenyang Atmospheric Environment Research Institute]

Abstract:

Based on the daily minimum temperature data from 52 observational stations in Liaoning Province and the NCEP/NCAR reanalysis data from 1975 to 2015, with composite analysis and correlation analysis, the spatial and temporal features of the winter minimum temperature in Liaoning and North Pacific storm track are analyzed, and the North Pacific storm track anomaly and its relationship with winter minimum temperature are studied. Some conclusions are drawn as follows. The winter minimum temperature in Liaoning had an obvious abrupt change around 1986, then the temperature continued to rise. The North Pacific storm track and the winter minimum temperature had synchronous consistent variation. In the years when North Pacific storm track was stronger, the winter minimum temperature was affected by the southwestern flow; at the same time, the Aleutian Low and Siberian High were at lower level, and the East Asia Trough weakened as it moved to north, the East Asian westerly jet stream at 500 hPa also moved to north. All these led to the weaker East Asian winter monsoon circulation, which was not conducive to the southward movement of cold air, leading to a higher winter temperature in Liaoning. In the years when North Pacific storm track was weaker, lower air temperature was observed in Liaoning. The main reason for the change of relationship with North Pacific storm track intensity and winter minimum temperature is anomalous change of atmospheric circulation at middle and high latitudes.

Key words: North Pacific storm track, minimum temperature in winter, atmospheric circulation anomaly, Liaoning Province