Analysis of Spring Temperature Anomaly and Its Causes in 2020

Authors

  • Chengyu Yan, Guohua Zhang, Haoye Liu, Zhiluan Lian, Tiantian Jin, Jinmei Song, Miaomiao Liu

Abstract

The maximum temperature in Hebei Province was unusually high for a week on March 17-23, 2020. We select the maximum temperature data of 6 representative stations in Hebei Province and NCEP / NCAR reanalysis data to analyze the cause of formation. The results show that: the polar vortex is stronger and more easterly than usual and there is no ridge to guide the cold air southward near the Ural Mountains. The East Asian trough is relatively weak in strength and east in location, resulting in a weak influence of cold air on Hebei Province. Hebei Province is located in the center of the maximum positive anomaly of the temperature field at 850hPa. The positive anomaly of 850hPa zonal wind, the strong foehn effect and the weak meridional wind make the influence of cold air weaker than usual. The sea-level mean wind patterns are different from the average years, indicating that they are less affected by the moist and cold air from the Bohai Sea, which is conducive to rising temperatures

Published

2020-02-29

Issue

Section

Articles