喀拉海和巴伦支海海冰对中高纬异常纬向环流 暨中国东部重霾天气形成的作用研究
投稿时间:2018-05-18  修订日期:2018-06-26  点此下载全文
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陈诚 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 NonoMeteor@qq.com 
牛涛 中国气象局灾害天气国家重点实验室/中国气象局大气化学实验室/中国气象科学研究院  
陆尔 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 elu@nuist.edu.cn  
中文摘要:采用1981年1月-2017年2月国家气象信息中心雾、霾数据集资料、同期NCEP/NCAR再分析资料以及哈德来中心的海冰资料,分析了秋冬季喀拉海和巴伦支海海冰变化与东亚冬季风暨中国东部冬季雾和霾日数变化特征之间的关系。研究结果表明,喀拉海和巴伦支海海冰对亚洲区中高纬纬向环流有重要影响,秋季海冰异常偏少是冬季亚洲区中高纬异常纬向环流形成的诱因之一。该地区秋季海冰偏少年,冬季亚洲中高纬地区纬向环流异常偏强,东亚大槽偏弱,影响我国东部地区的东亚冬季风减弱,这为大气污染物在水平方向上的聚集提供了有利条件,同时在海冰偏少年,对流层从中层向下均为正温度距平,与地表温差减小,不利于对流发展,使得大气的状况变得更加稳定,不利于大气污染物在垂直方向上的扩散,水平和垂直方向上的共同作用导致中国东部地区易发生霾天气过程。虽然喀拉海和巴伦支海海冰是影响中国东部地区冬季霾过程发生的重要因子之一,但其对冬季中国东部雾天气发生日数多寡的影响并不显著。 亚洲区纬向环流指数相比经向环流指数更能反应中国东部地区冬季雾霾日数的变化,冬季亚洲中高纬纬向环流越强,中国东部地区雾霾日数越多。
中文关键词:海冰      东亚冬季风  纬向环流  异常
 
Effect of ice in the Barents–Kara Seas on zonal circulation over mid-high latitudes and severe haze events in eastern China
Abstract:Based on fog-haze dataset from National Meteorological Information Center, NCEP/NCAR reanalysis data and sea ice concentration (SIC) dataset from the British Atmospheric Data Centre from January 1981 to February 2017, the effect of Barents–Kara Seas’ ice in both autumn and winter on East Asian winter monsoon and changes of winter fog and haze events in eastern China has been discussed. Results suggest that: Changes of the Barents–Kara Seas’ ice since autumn have greatly affected the strength of the zonal circulation and the East Asian trough Asian over mid-high latitudes and the intensity of the East Asian winter monsoon. Barents–Kara Seas’ ice is one of the important factors affecting the winter haze events in eastern China, but it has less significant effect on the winter fog weather. Less sea ice in Barents–Kara Seas strengthen zonal circulation over mid-high latitudes of Asia, east Asian trough and the influence of east Asian winter monsoon are weakened, which provides favorable conditions to the atmospheric pollutants’ gathering in the horizontal direction. Meanwhile there exist positive temperature anomaly in the middle and lower troposphere, and the difference between the temperature of higher layer and surface decrease which is not conducive to the development of convection, makes the atmospheric conditions more stable and provides favorable conditions to the atmospheric pollutants’ gathering in the vertical direction. The influence of both horizontal and vertical direction leads to haze weather in eastern China.
keywords:Sea ice  fog  haze  EAWM  zonal circulation  anomaly
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