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北欧海比容高度及其与卫星高度计海表面高度异常的比较 总被引：2，自引：1，他引：1
In this study the steric height anomaly which is calculated from the hydrological data(EN3) is compared with the sea level anomaly derived from satellite altimetry in the Nordic Seas. The overall pattern of steric height is that it is higher in the margin area and lower in the middle area. The extreme values of steric height linear change from1993 to 2010 occur in the Lofoten Basin and off the Norwegian coast, respectively. Such a distribution may be partly attributed to the freshening trend of the Nordic Seas. The correlation between SLA(sea level anomaly) and SHA(steric height anomaly) is not uniform over the Nordic Seas. The time series of SLA and SHA agree well in the Lofoten Basin and northern Norwegian Basin, and worse in the northern Norwegian Sea, implying that the baroclinic effect plays a dominant role in most areas in the Norwegian Sea and the barotropic effect plays a dominant role in the northern Norwegian Sea. The weaker correlations between SLA and SHA in the Greenland and Iceland Seas lead a conclusion that the barotropic contribution is significant in these areas. The area-mean SHA over the entire Nordic Seas has similar amplitudes compared with the SLA during 1996–2002, but SHA has become lower than SLA, being less than half of SLA since 2006. 相似文献
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北欧海深层水的研究进展 总被引：1，自引：0，他引：1
北欧海作为联系北大西洋和北冰洋的纽带,在全球气候系统中具有重要作用。受冷却等作用的影响,北欧海上层海水下沉形成中层水和深层水。该部分海水向南输运,以溢流的形式进入北大西洋深层,是在全球大洋输送带中具有关键性作用的北大西洋深层水的重要来源。通过综述国内外关于北欧海深层水的研究历史和研究现状,剖析了北欧海深层水形成的重要物理过程,分析了影响北欧海深层水的可能因素和物理过程、北欧海深层水的输运过程以及北欧海深层水近年来的变化趋势,为开展相关研究提供参考。 相似文献
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本文研究了德雷克海峡的打开对海洋环流的影响.德雷克海峡未打开时,南半球中高纬度之间风应力旋度产生的流涡促进了中高纬度之间的热量交换;德雷克海峡打开后,南极绕极流(ACC)形成,绕极流区的强锋面阻隔了南半球低纬度向高纬度的热量传输.基于以上认识,本文利用一个箱式模型分析了德雷克海峡闭合时的风应力和打开时的海洋温度锋面分别对南极底层水(AABW)和北大西洋深层水(NADW)形成的影响.实验发现:(1)德雷克海峡闭合时,风应力产生的流涡强度增大,可导致AABW形成减少、NADW形成增多;南半球高纬度增温,整个大洋底层水的温度也同时升高.(2)德雷克海峡打开时,只有温度梯度达到一定强度才会有AABW形成,并导致南半球高纬度地区和大洋大部分底层水变冷;而当锋面强度小于临界值(本模式中为4.03℃)时,没有AABW形成,海盆中大部分区域的海温都偏高.模式实验结果表明,德雷克海峡打开的过程中,风应力的改变与海洋温度锋面的形成影响了AABW和NADW的形成,从而改变了大洋经向翻转环流的状态. 相似文献
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