Correction to: Emergence of deep convection in the Arctic Ocean under a warming climate
Correction to: Emergence of deep convection in the Arctic Ocean under a warming climate
复制标题
修正：气候变暖下北冰洋深层对流的出现
DOI：
10.1007/s00382-017-3999-9
复制
发表时间：
2017
期刊：
影响因子：
4.6
通讯作者：
Lique C
中科院分区：
文献类型：
--
作者：
Lique C
利用HiGEM耦合全球气候模式研究了变暖气候下北冰洋冬季深层混合层的出现。相对于目前的情况，由于大气水平增加了四倍，北极盆地变得季节性无冰。因此，它的表面变得更温暖，平均而言，也稍微新鲜一些。局部地区，地表盐度的变化可能比盆地尺度的平均值大得多（高达4psu），并且具有不同的标志。加拿大盆地经历了强烈的新鲜化，而欧亚盆地则经历了强烈的盐碱化。这些变化是由地表环流的自旋上升驱动的，这可能是由于海冰覆盖减少，向海洋的动量转移增加所致。表层盐度场的变化也导致了分层的变化，这种变化在加拿大盆地强烈增强，在欧亚盆地减弱。欧亚盆地分层的减少甚至抑制产生了有利于并促进海冰边缘附近深层对流出现的环境，导致该地区冬季混合层显著加深（深达1000米）。随着北冰洋向夏季无冰状态过渡，该地区将出现新的海洋动力过程，对北冰洋本身以及局部和更大范围的气候都可能产生重要影响。
The appearance of winter deep mixed layers in the Arctic Ocean under a warming climate is investigated with the HiGEM coupled global climate model. In response to a four times increase of atmosphericlevels with respect to present day conditions, the Arctic Basin becomes seasonally ice-free. Its surface becomes consequently warmer and, on average, slightly fresher. Locally, changes in surface salinity can be far larger (up to 4 psu) than the basin-scale average, and of a different sign. The Canadian Basin undergoes a strong freshening, while the Eurasian Basin undergoes strong salinification. These changes are driven by the spin up of the surface circulation, likely resulting from the increased transfer of momentum to the ocean as sea ice cover is reduced. Changes in the surface salinity field also result in a change in stratification, which is strongly enhanced in the Canadian Basin and reduced in the Eurasian Basin. Reduction, or even suppression, of the stratification in the Eurasian Basin produces an environment that is favourable for, and promotes the appearance of, deep convection near the sea ice edge, leading to a significant deepening of winter mixed layers in this region (down to 1000 m). As the Arctic Ocean is transitioning toward a summer ice-free regime, new dynamical ocean processes will appear in the region, with potentially important consequences for the Arctic Ocean itself and for climate, both locally and on larger scales.