Characteristics of the Winter Extreme Low Temperature Events in Ningxia and their Relationship with the Arctic Sea Ice Coverage Anomalies in Autumn

  • Fan WANG ,
  • Qingquan LI ,
  • Yinchuan SUN ,
  • Dai WANG ,
  • Guangfen ZHENG ,
  • Xiaowei ZHU
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  • <sup>1.</sup>Ningxia Hui Autonomous Region Climate Center,Yinchuan 750002,Ningxia,China;<sup>2.</sup>Laboratory for Climate Studies,National Climate Center,China Meteorological Administration,Beijing 100081,China;<sup>3.</sup>Key Laboratory of Meteorological Disaster,Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science &Technology (NUIST),Nanjing 210044,Jiangsu,China

Received date: 2019-04-03

  Online published: 2021-08-28

Abstract

Based on daily maximum and minimum temperature in Ningxia of China, monthly sea ice concentration from the Hadley Centre of UK, monthly atmospheric reanalysis data from the National Centers for Environmental Prediction/National Center for Atmospheric Research of US, and the East Asian Winter Monsoon Index and Siberia High Index from National Climate Center of China Meteorological Administration, the characteristics of extreme winter low temperature events in Ningxia and their relationship with autumn sea ice concentration in the key region of the Arctic from 1961 to 2018 were systematically studied.The results show that the frequency of cold day and cold night in winter in Ningxia has decreased significantly since 1960s.The intensity of extreme low temperature events generally tends to weaken, and the daily extreme low temperature increases obviously.The Arctic sea ice anomaly in autumn is significantly related to the sea ice anomaly in the following winter.The sea ice anomaly in autumn influences the atmospheric circulation in the following winter through the seasonal sustainability, and then affects the winter temperature.When the sea ice concentration is low in the Lapjev-East Siberian Sea and high in Greenland Sea in the previous autumn, the Siberian High Index and the East Asian Winter Monsoon Index become stronger, which is benefit to more extreme temperature events occurring in Ningxia in winter.The 500 hPa geopotential height Arctic-Eurasia-Aleutian region's "L" like phase wave pattern decreased the height difference between the Arctic and Eurasia in the mid-high latitudes, the mid-high latitude westerly airflow is weakened, and the zonal activity is weakened, that’s conducive to the cold air of the Arctic to the low latitudes.Correspondingly, the sea level pressure is high in Siberia and cold air is squeezed from the polar region to the middle and high latitudes in the Northern Hemisphere, which makes the cold air easy to reach in Ningxia and results in more extreme cold weather days there.

Cite this article

Fan WANG , Qingquan LI , Yinchuan SUN , Dai WANG , Guangfen ZHENG , Xiaowei ZHU . Characteristics of the Winter Extreme Low Temperature Events in Ningxia and their Relationship with the Arctic Sea Ice Coverage Anomalies in Autumn[J]. Plateau Meteorology, 2021 , 40(4) : 887 -897 . DOI: 10.7522/j.issn.1000-0534.2020.00054

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