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Mechanism and effects of the increase in winter temperatures in the Arctic region on cold winters in Heilongjiang Province,Northeast China for the period 1961-2018

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Journal of Geographical Sciences 2022年第2期32卷 225-240页

作者： WANG Xiaodi LI Yongsheng ZHANG Lijuan SONG Shuaifeng PAN Tao REN Chong TAN Yulong School of Geography and Tourism Harbin UniversityHeilongjiang Province Key Laboratory of Cold Region Wetland Ecology and Environment ResearchHarbin 150086China Climate Center of Heilongjiang Province Harbin 150030China Key Opening Laboratory for Northeast China cold Vortex Research Shenyang 110166China Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in cold Regions Harbin Normal UniversityHarbin 150025China The State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Hulin Meteorological Bureau of Heilongjiang Province Hulin 158499HeilongjiangChina

With the advent of climate change,winter temperatures have been steadily increasing in the middle-to-high latitudes of the ***,we have not found a corresponding decrease in the number of extremely cold *** paper,based on Climatic Research Unit(CRU)re-analysis data,and methods of trend analysis,mutation analysis,correlation analysis,reports on the effects of Arctic warming on winter temperatures in Heilongjiang Province,Northeast *** results show that:(1)during the period 1961-2018,winter temperatures in the Arctic increased considerably,that is,3.5 times those of the Equator,which has led to an increasing temperature gradient between the Arctic and the *** abrupt change in winter temperatures in the Arctic was observed in 2000.(2)Due to the global warming,an extremely significant warming occurred in Heilongjiang in winter,in particular,after the Arctic mutation in 2000,although there were two warm winters,more cold winters were observed and the interannual variability of winter temperature also increased.(3)Affected by the warming trend in the Arctic,the Siberian High has intensified,and both the Arctic Vortex and the Eurasian Zonal Circulation Index has *** explains the decrease in winter temperatures in Heilongjiang,and why cold winters still ***,the increase in temperature difference between the Arctic and the Equator is another reason for the decrease in winter temperatures in Heilongjiang.

关键词： temperature of Arctic region in winter cold winter effect mechanism Heilongjiang Province

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Analysis of the extremely cold and heavy snowfall in North America in January 2015

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Atmospheric and Oceanic Science Letters 2016年第2期9卷 75-82页

作者： CUI Hong-yan QIAO Fang-li First Institute of Oceanography State Oceanic Administration Key Laboratory of Marine Science and Numerical Modeling State Oceanic Administration

With global warming and declining Arctic sea ice area in autumn observed by satellites since 1979, anomalous cold snaps in recent winters have affected large parts of North America, Europe, and East Asia. In January 2015, North America suffered extremely cold and heavy snowfall events. As revealed in this paper, the NCEP reanalysis data show that the temperature decreased significantly in January 2015 in North America, including the air temperature in the troposphere and the surface air temperature. Moreover, snow cover increased obviously in January 2015 in North America, while there was a significant negative anomaly of geopotential height. The wind formed the anomalous pattern, which favored cold currents blowing to the North American continent from the polar region, and bringing plenty of water vapor. Our results suggest that the anomalous north wind and decreasing westerly jet stream, which allowed cold and moist air to easily penetrate the North American continent from the Arctic, was one of the main reasons for the extremely cold and heavysnow winter of 2015 in North America.

关键词： Snowfall cold winter atmospheric circulation geopotential height strong north wind

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Sensitivity and nonlinearity of Eurasian winter temperature response to recent Arctic sea ice loss

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Acta Oceanologica Sinica 2017年第8期36卷 52-58页

作者： SUI Cuijuan ZHANG Zhanhai YU Lejiang LI Yi SONG Mirong College of Physical and Environmental Oceanography Ocean University of ChinaQingdao 266100China National Marine Environmental Forecasting Center Beijing 100081China Polar Research Institute of China Shanghai 200129China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China

The recent decline in the Arctic sea ice has coincided with more cold winters in Eurasia. It has been hypothesized that the Arctic sea ice loss is causing more mid-latitude cold extremes and cold winters, yet there is lack of consensus in modeling studies on the impact of Arctic sea ice loss. Here we conducted modeling experiments with Community Atmosphere Model Version 5 （CAM5） to investigate the sensitivity and linearity of Eurasian winter temperature response to the Atlantic sector and Pacific sector of the Arctic sea ice loss. Our experiments indicate that the Arctic sea ice reduction can significantly affect the atmospheric circulation by strengthening the Siberian High, exciting the stationary Rossby wave train, and weakening the polar jet stream, which in turn induce the cooling in Eurasia. The temperature decreases by more than I^C in response to the ice loss in the Atlantic sector and the cooling is less and more shifts southward in response to the ice loss in the Pacific sector. More interestingly, sea ice loss in the Atlantic and Pacific sectors together barely induces cold temperatures in Eurasia, suggesting the nonlinearity of the atmospheric response to the Arctic sea ice loss.

关键词： cold winter CAM5 sensitivity experiment jet stream

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