Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK. GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 24, 24105 Kiel, Germany.
Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK.
Science. 2014 Dec 5;346(6214):1227-31. doi: 10.1126/science.1256117.
Decadal trends in the properties of seawater adjacent to Antarctica are poorly known, and the mechanisms responsible for such changes are uncertain. Antarctic ice sheet mass loss is largely driven by ice shelf basal melt, which is influenced by ocean-ice interactions and has been correlated with Antarctic Continental Shelf Bottom Water (ASBW) temperature. We document the spatial distribution of long-term large-scale trends in temperature, salinity, and core depth over the Antarctic continental shelf and slope. Warming at the seabed in the Bellingshausen and Amundsen seas is linked to increased heat content and to a shoaling of the mid-depth temperature maximum over the continental slope, allowing warmer, saltier water greater access to the shelf in recent years. Regions of ASBW warming are those exhibiting increased ice shelf melt.
毗邻南极洲的海水性质的年代际变化知之甚少，导致这些变化的机制尚不确定。南极冰盖质量损失主要受冰架底部融化驱动，而冰架底部融化受海洋-冰相互作用影响，并与南极大陆架底层水（Antarctic Continental Shelf Bottom Water，ASBW）温度相关。我们记录了南极大陆架和斜坡上温度、盐度和核心深度的长期大规模趋势的空间分布。在别林斯高晋海和阿蒙森海，海底变暖与热含量增加以及中深温度最大值在大陆斜坡上的变浅有关，这使得近年来更多的温暖、咸水能够进入大陆架。ASBW 变暖的区域是冰架融化增加的区域。
