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。
Abstract： 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 atmo- spheric circulation and air temperature above high-latitude area in the Northern Hemisphere have a significant re- lationship. Under the same mode, accordingly, the atmospheric conditions change in the opposite direction corre- sponding anti-phase of the sea ice distribution.
出处
《海洋预报》
北大核心
2013年第4期12-17,共6页
Marine Forecasts
基金
国家自然科学基金重点项目(40930848)
青年科学基金项目(41206186)
关键词
海冰密集度
EOF分解
合成分析
sea ice concentration
EOF decomposition
composite analysis
