| Investigation of Arctic air temperature extremes at north of 60°N in winter |
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| 引用本文： | 隋翠娟,张占海,于乐江,李熠,宋米荣.Investigation of Arctic air temperature extremes at north of 60°N in winter[J].海洋学报(英文版),2017,36(11):51-60. |
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| 作者姓名： | 隋翠娟 张占海 于乐江 李熠 宋米荣 |
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| 作者单位： | 中国海洋大学海洋与大气学院, 青岛, 266100;国家海洋环境预报中心, 北京, 100081,中国海洋大学海洋与大气学院, 青岛, 266100,中国极地研究中心, 上海, 200129;海洋局极地科学重点实验室, 上海, 200136,国家海洋环境预报中心, 北京, 100081,中国科学院大气物理研究所, 北京, 100029 |
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| 基金项目： | 南北极环境综合考察专项-极地对全球和我国气候变化影响的综合评价（CHINARE2016-04-04）；海洋公益性行业科研专项项目（201505013）；国家自然科学基金（41576029） |
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| 摘 要： | Air temperature is a key index reflecting climate change. Air temperature extremes are very important because they strongly influence the natural environment and societal activities. The Arctic air temperature extremes north of 60°N are investigated in the winter. Daily data from 238 stations at north of 60°N from the global summary of the day for the period 1979–2015 are used to study the trends of cold days, cold nights, warm days and warm nights during the wintertime. The results show a decreasing trend of cold days and nights(rate of –0.2 to –0.3 d/a) and an increasing trend of warm days and nights(rate of +0.2 to +0.3 d/a) in the Arctic. The mean temperature increases,which contributes to the increasing(decreasing) occurrence of warm(cold) days and nights. On the other hand,the variance at most stations decreased, leading to a reduced number of cold events. A positive AO(Arctic Oscillation) index leads to an increased(decreased) number of warm(cold) days and nights over northern Europe and western Russia and an increased(decreased) number of cold(warm) days and nights over the Bering Strait and Greenland. The lower extent of Arctic autumn sea ice leads to a decreased number of cold days and nights.The occurrences of abrupt changes are detected using the Mann-Kendall method for cold nights occurring in Canada in 1998 and for warm nights occurring in northwestern Eurasia in 1988. This abrupt change mainly resulted from the mean warming induced by south winds and an increased North Atlantic sea surface temperature.
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| 关 键 词： | 极端温度事件 趋势分析 突变分析 合成分析 |
| 收稿时间： | 2017/5/11 0:00:00 |
| 修稿时间： | 2017/7/3 0:00:00 |
Investigation of Arctic air temperature extremes at north of 60°N in winter |
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| SUI Cuijuan,ZHANG Zhanhai,YU Lejiang,LI Yi and SONG Mirong.Investigation of Arctic air temperature extremes at north of 60°N in winter[J].Acta Oceanologica Sinica,2017,36(11):51-60. |
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| Authors: | SUI Cuijuan ZHANG Zhanhai YU Lejiang LI Yi and SONG Mirong |
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| Institution: | College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing 100081, China,College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China,Polar Research Institute of China, Shanghai 200129, China;Key Laboratory for Polar Science, Polar Research Institute of China, State Oceanic Administration, Shanghai 200136, China,National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing 100081, China and Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Air temperature is a key index reflecting climate change. Air temperature extremes are very important because they strongly influence the natural environment and societal activities. The Arctic air temperature extremes north of 60°N are investigated in the winter. Daily data from 238 stations at north of 60°N from the global summary of the day for the period 1979-2015 are used to study the trends of cold days, cold nights, warm days and warm nights during the wintertime. The results show a decreasing trend of cold days and nights (rate of -0.2 to -0.3 d/a) and an increasing trend of warm days and nights (rate of +0.2 to +0.3 d/a) in the Arctic. The mean temperature increases, which contributes to the increasing (decreasing) occurrence of warm (cold) days and nights. On the other hand, the variance at most stations decreased, leading to a reduced number of cold events. A positive AO (Arctic Oscillation) index leads to an increased (decreased) number of warm (cold) days and nights over northern Europe and western Russia and an increased (decreased) number of cold (warm) days and nights over the Bering Strait and Greenland. The lower extent of Arctic autumn sea ice leads to a decreased number of cold days and nights. The occurrences of abrupt changes are detected using the Mann-Kendall method for cold nights occurring in Canada in 1998 and for warm nights occurring in northwestern Eurasia in 1988. This abrupt change mainly resulted from the mean warming induced by south winds and an increased North Atlantic sea surface temperature. |
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| Keywords: | extreme temperature events trend analysis abrupt change analysis composite analysis |
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