主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2022, Vol. 38 ›› Issue (2): 31-39.doi: 10.3969/j.issn.1673-503X.2022.02.004

• Articles • Previous Articles     Next Articles

Intraseasonal variation of wintertime air temperature in Heilongjiang province and circulation anomalous characteristics from 1961 to 2019

De-jun LOU1,2(),Ji WANG3,*(),Xian-wei ZHOU1,Zhi-min LI1   

  1. 1. Qiqihar Meteorological Service, Qiqihar 161006, China
    2. Heilongjiang Longyun Meteorological Information Technology Co., Ltd. Academician Workstation, Harbin 150030, China
    3. Beijing Climate Center, Beijing 100089, China
  • Received:2021-02-28 Online:2022-04-28 Published:2022-04-24
  • Contact: Ji WANG E-mail:ldj7308@163.com;wangji_zl@163.com

Abstract:

Based on air temperature data, the National Centre for Environment and Prediction (NCEP) reanalysis data, and circulation indices in Heilongjiang province in winter from 1961 to 2019, we analyzed the intraseasonal variation of wintertime air temperature in Heilongjiang province and the circulation anomalous characteristics using the methods of multivariate empirical orthogonal function (EOF) decomposition, synthetic analysis, correlation analysis, etc.We also compared the relative contribution of main circulation factors in the different modes during the intraseasonal evolution of temperature.The results showed that the intraseasonal variation of wintertime air temperature in Heilongjiang province is one of its basic features.There are three major modes for wintertime air temperature in Heilongjiang province, including the intraseasonal consistent variation, the antiphase variation between December and January-February in the next year, and the antiphase variation between December-January and February.When the air temperature in winter shows the first mode and distributes uniformly warm (cold), the circulation is characterized by an Arctic Oscillation (AO) positive (negative) phase and relatively weaker (stronger) East Asian winter monsoon.When a warm-cold transition occurs in winter, significant variation can be found in the intraseasonal polar vortex, the upper-level jets, the Siberian High (SH), and EAWM intensity, and mid-high latitudes circulation meridian, etc.The circulation in January in the second mode and in February in the third mode show a similar distribution to the Polar Eurasian (PEA) and the East Atlantic (EA) teleconnections, respectively.AO, SH, EAWM, PEA, and EA are the important influencing factors on the intraseasonal variation of wintertime air temperature.

Key words: Empirical orthogonal function (EOF), Circulation indices, Circulation anomaly

CLC Number: