In May–June 2013, the RV G.O. Sars surveyed the Norwegian, Iceland, Irminger, and Labrador seas in the North Atlantic to explore distributions of plankton and pelagic/mesopelagic fish as part of the Euro-BASIN (Basin-scale Analysis, Synthesis, and INtegration) Project. From temperature and salinity measurements collected along the ship's track, we present and compare the hydrography of the different basins using water mass analyses. In addition, we place these 2013 data into a long-term perspective by examining the historical data in these seas and exploring their variability. From the 2013 hydrographic data, we estimate the mixed layer depth at each station. During the 2013 survey, we confirmed that all four seas are influenced through advection from the south by North Atlantic Water and from the north by water originating from the Arctic but by different amounts. The 2013 data are consistent within the previously observed range of hydrographic variability. During the duration of the cruise, the mixed layer depth shallowed significantly in the Norwegian, Iceland, and Irminger seas due likely to a combination of atmospheric heat exchanges and advective changes. The largest and most consistent difference between the basins was in the deep water (>1000 m) with the Norwegian/Iceland basins containing colder, fresher waters than the Irminger/Labrador basins. Oxygen data collected during the survey and their relationship with the hydrographic structure are also discussed. The hydrographic data in this paper were used in the several of the following papers in this special issue to show their impact on the ecology of the four basins.

2013年5月至6月，RV GO Sars对北大西洋的挪威，冰岛，艾明格和拉布拉多海域进行了调查，以探索浮游生物和上层/中上生鱼类的分布，这是Euro-BASIN（盆地-规模分析，综合和集成）项目。根据沿船航迹收集的温度和盐度测量值，我们使用水量分析来呈现和比较不同流域的水文学。此外，我们通过检查这些海洋中的历史数据并探讨其变化性，将2013年的数据放在了长期的视野中。根据2013年的水文数据，我们估算每个站点的混合层深度。在2013年的调查中，我们确认所有四个海域都受到了北大西洋水域对南对流的影响，以及受北极来源的水对北对北海域的影响，但影响程度不同。2013年的数据在先前观察到的水文变异范围内是一致的。在航行期间，挪威人的混合层深度明显变浅，冰岛和艾明格海可能是由于大气热交换和平流变化共同作用的结果。这些盆地之间最大和最一致的差异是深水（> 1000 m），而挪威/冰岛盆地的水比艾明格/拉布拉多盆地的水更冷，更新鲜。还讨论了在调查期间收集的氧气数据及其与水文结构的关系。在本期特刊中，以下几篇论文中使用了本文中的水文数据，以显示它们对四个流域生态的影响。比Irminger / Labrador流域的水域更新鲜。还讨论了在调查期间收集的氧气数据及其与水文结构的关系。在本期特刊中，以下几篇论文中使用了本文中的水文数据，以显示它们对四个流域生态的影响。比Irminger / Labrador流域的水域更新鲜。还讨论了在调查期间收集的氧气数据及其与水文结构的关系。在本期特刊中，以下几篇论文中使用了本文中的水文数据，以显示它们对四个流域生态的影响。