北欧海海平面异常及海水密度的时空特征  

The Space-time Characteristics of Sea Level Anomaly and Sea Water Density in the Nordic Sea

作　　者：吕蒙[1] 

机构地区：[1]中国海洋大学海洋环境学院,山东青岛266100

出　　处：《海洋湖沼通报》2015年第4期17-26,共10页Transactions of Oceanology and Limnology

摘　　要：北欧海连接着北冰洋和北大西洋,在全球环流和气候中起着重要的作用。本文采用EOF方法对基于高度计遥感的SLA进行了分析,给出了其时空分布特征。对SODA数据给出的SSH和SST进行了SVD的分析,并利用ISHii再分析数据分析了海水密度的变化特征。结果表明,季节变化是导致SLA总体变化的主要因素,而中心区域的下沉流是导致SLA异常低的重要因素:东格陵兰海域极地水与北大西洋暖流交汇,形成的低温、高盐、高密的海水导致下沉流。文章最后分析了近20a来北欧海的SST变化,得出北欧海SST以0.024°C/year的速度升温,表明有更多的热量通过热盐环流向大洋底部输送,这将有利于减缓全球的气温升高。Nordic Sea is a connecting area between the Arctic Ocean and the North Atlantic Ocean playing a fundamental and essential role in the global ocean circulation and climate development.In this paper,EOF method is used to analyze the SLA data from the satellite remote sensing,giving its spacetime distribution characteristics.Using the data from SODA system and ISHii Reanalysis data,the paper individually completes the SVD analysis of the SSH and SST in Nordic Sea and figures out the characteristics of the marine salinity variance.It shows that seasonal changes are the main driving factor of the SLA overall changes.Besides,the sinking flow in the central area causes the SLA in the central area abnormally lower than other areas,in which the East Greenland seawater intersects with the North Atlantic warm seawater leading to the generation of a higher salinity,lower temperature,higher density sinking seawater.In the end,the paper analyze the SST changes of Nordic Sea in recent twenty years,concluding that average SST in the Nordic sea area is increasing at a rate of 0.024/year.It proves that more energy above the sea surface is being transported into the ocean bottom,which can help lower the global temperature increase for a redistribution of energy.

关 键 词：北欧海 海表面异常 海平面高度 海表面温度 海水密度 EOF分析 SVD分析 

分 类 号：P731.13[天文地球—海洋科学]