北极海冰与北半球大气环流及气温的相关性分析-海洋预报

北极海冰与北半球大气环流及气温的相关性分析

单位：国家海洋环境预报中心, 北京 100081

分类号：P732

出版年·卷·期（页码）：2013·30·第四期（12-17）

摘要：

利用NASA的北极海冰密集度资料（分辨率1.0°×0.25°，时间1979.10—2002.8）对冬季（12—2月）鄂霍次克海到白令海（42°—66°N、131°—158°W）的海冰场进行EOF分解，得到特征向量的空间分布及时间系数。利用NCEP再分析月资料（分辨率2.5°×2.5°，时间1979—2002年），采用合成分析的方法，分别对该区域海冰分布第一特征向量时间系数超过+0.5和低于-0.5年份做冬季500 hPa高度、1000 hPa高度、1000 hPa气温的合成距平场。分析结果表明该区域的海冰分布与北半球中高纬度的大气环流和气温有显著的关系，同一模态下的海冰分布反位相时对应的大气状况也有明显的相反趋势。

Based on NASA sea ice concentration data (resolution: 1.0°×0.25°, time period: 1979.10—2002.8), the spatial distribution and temporal coefficient of the eigenvector for the sea ice are obtained from December to February in the Bering Sea and Sea of Okhotsk by EOF method. In addition, NCEP monthly reanalysis data was used to calculate the 500hPa height, 1000 hPa height, 1000 hPa temperature synthetic anomaly field in winter when the first eigenvector time factor of the regional sea ice distribution exceeds +0.5 and below -0.5 using the composite analysis method. The analysis results show that the sea ice distribution in that region and the atmospheric circulation and air temperature above high-latitude area in the Northern Hemisphere have a significant relationship. Under the same mode, accordingly, the atmospheric conditions change in the opposite direction corresponding anti-phase of the sea ice distribution.

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