北极冬季季节性海冰双模态特征分析

郝光华; 苏洁; 黄菲

doi:10.3969/j.issn.0253-4193.2015.11.002

北极冬季季节性海冰双模态特征分析

doi: 10.3969/j.issn.0253-4193.2015.11.002

中国海洋大学物理海洋教育部重点实验室, 山东青岛 266100

基金项目: 国家重点基础研究发展计划(973)全球变化研究重大科学研究计划项目(2015CB953900,2013CBA01800);国家自然科学委员会重点基金项目(41330960)。

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出版历程
- 收稿日期: 2015-05-15

Analysis of the dual-mode feature of Arctic seasonal sea ice

Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao 266100, China

摘要

摘要: 近年来北极海冰快速变化,北极中央区边缘正由以多年冰为主转为季节性海冰为主。通过对北极冬季季节性海冰的EOF分解发现,2002-2012年期间北极季节性海冰变化的前两模态主要体现为2005年和2007年的季节性海冰距平。其中第二模态主要体现了北极海冰在2005年的一种极端变化,而第一模态不仅体现了北极海冰在2007年的变化,还体现了北极季节性海冰的从负位相到正位相的转变。通过比较发现,在研究时段北极季节性海冰最主要的变化发生在北极太平洋扇区,在2007年,冬季季节性海冰距平发生位相转变,2007-2010年一直维持正位相,北极太平洋扇区冬季季节性海冰保持显著正距平。太平洋扇区表面温度最大异常也发生在2007年,从大气环流来看,2007年之后波弗特海区异常高压有利于夏季太平洋扇区海冰的减少,而西风急流的减弱有利于夏季波弗特海区异常高压的维持,结合夏季海冰速度,顺时针的冰速分布有利于海冰离开太平洋扇区,因而会导致冬季太平洋扇区季节性海冰转为正距平并且从2007年一直维持到2010年。
- 北极 /
- 季节性海冰 /
- 海冰密集度 /
- 双模态特征
Abstract: The change of Arctic sea ice change rapidly mainly occurred in the edge of central Arctic region in recent years. The edge area of the central Arctic is tending to be covered by seasonal ice which was dominated by multiyear ice in the past. The analysis in this paper shows that the first two EOF modes of seasonal sea ice anomaly mainly shows the characteristics of sea ice of year 2007 and 2005. The second mode mainly reflects an extreme change of Arctic sea ice in 2005, while the first mode not only reflects the change of Arctic sea ice in 2007, but also reflects a phase shift of seasonal sea ice in winter during 2002-2010. During the study period, the seasonal sea ice variability mainly occurs in the Pacific sector of the Arctic Ocean. The phase of seasonal sea ice anomaly is negative before 2007 and shifts to positive after 2007, and the positive phase continues to 2010. The maximum anomalies of surface temperature in Pacific sector occur in 2007. And the anomaly high air pressure in Beaufort Sea region helps to reduce the summer sea ice in the Pacific sector, and the weakened westerly jet is in favor of positive anomaly high air pressure in Beaufort Sea region in summer and autumn. Also the clockwise ice velocity distribution is in favor of ice leaving from the Pacific sector, which will lead to the positive seasonal ice anomalies in winter maintained from 2007 to 2010 in Pacific sector.
- Arctic /
- seasonal sea ice /
- ice concentration /
- dual-mode feature

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参考文献(28)

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