极地研究

极地研究 ›› 2015, Vol. 27 ›› Issue (4): 364-378.DOI: 10.13679/j.jdyj.2015.4.364

• 研究论文 • 上一篇    下一篇

北半球夏季中高纬度大气阻塞对北极海冰变化的影响

肖贻青1,2 黄斌3 刁一娜2 罗德海4   

  1. 1 陕西省气象台，陕西 西安 710014； 2 中国海洋大学海洋环境学院，山东 青岛 266100； 3 成都信息工程学院，四川 成都 610225； 4 中国科学院东亚区域气候环境重点实验室，北京 100029
  • 收稿日期:2014-09-11 修回日期:2014-09-30 出版日期:2015-12-30 发布日期:2015-12-30
  • 通讯作者: 肖贻青
  • 基金资助:

    全球变化研究国家重大科学研究计划;国家自然科学基金重点项目资助

EFFECT OF NORTHERN HEMISPHERE MID-HIGH LATITUDE BLOCKING ON THE VARIATION OF SUMMER ARCTIC SEA ICE

Xiao yiqing1,2, Huang Bin3, Diao Yina2, Luo Dehai4   

  1. 1 Shaanxi Meteorological Observatory, Xi'an 710014, China; 2 Ocean Environmental College, Ocean University of China, Qingdao 266100, China; 3 Chengdu University of Information Technology, Chengdu 610225, China; 4 Key Laboratory of Regional Climate-Environment for Temperate East Asia, Chinese Academy of Sciences, Beijing 100029, China
  • Received:2014-09-11 Revised:2014-09-30 Online:2015-12-30 Published:2015-12-30
  • Contact: Xiao yiqing

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被引次数

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摘要： 利用NCEP/NCAR再分析逐日500hPa高度场资料，对北半球夏季中高纬度大气阻塞特征进行统计分析，发现大气阻塞活动频率高的地区主要集中在白令海峡区域、鄂霍次克海区域、欧亚大陆区域及格陵兰区域。而通过NSIDC提供的卫星观测资料发现近30年夏季海冰容易减少的区域正好对应阻塞活动北部的高纬度地区。分别通过对以上四个区域有阻塞发生相对没有阻塞发生时的500 hPa位势高度场、地面温度场、850 hPa经向瞬变热通量输送和平流输送等异常变化场进行对比分析，结果发现夏季中高纬度阻塞频率的增加对海冰的减少有显著影响，主要体现在阻塞的发生发展可通过增加高纬度地面温度、对极地的热量输送和暖平流输送来加快海冰的融化。这种阻塞引起的热力作用在鄂霍次克海和欧亚大陆区域效果更为显著。

关键词: 北极海冰, 北极增暖, 阻塞

Abstract: The relationship between mid-high latitude blocking in North hemisphere (NH) summer and the decline of summer Arctic sea ice is analyzed by using NCEP/NCAR daily 500 hPa geopotential height reanalysis data. Results show that there are high blocking frequencies over Bering Strait, Okhotsk Sea, Eurasia and Greenland, which are extremely similar to the areas with reduction of Arctic sea ice in the summer in recent 30 years, as observed from satellite data. The difference of surface temperature, meridional heat transport and temperature advection in 850 hPa anomaly fields between days with and without blocking are calculated to show that mid-high latitude blocking have a significant impact on the reduction of sea ice. The increase of blocking frequency in NH mid-high latitudes will increase the surface air temperature, poleward heat transport and temperature advection so as to accelerate the melting of Arctic sea ice. The thermodynamic effects caused by blocking over Okhostk Sea and Eurasia can significantly result in the reduction of Arctic the sea ice.

Key words: Arctic sea ice, Arctic amplification, blocking