Kipp Lauren E, Charette Matthew A, Moore Willard S, Henderson Paul B, Rigor Ignatius G
Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
Massachusetts Institute of Technology-Woods Hole Oceanographic Institution Joint Program in Oceanography/Applied Ocean Science and Engineering, Woods Hole, MA 02543, USA.
Sci Adv. 2018 Jan 3;4(1):eaao1302. doi: 10.1126/sciadv.aao1302. eCollection 2018 Jan.
Rising temperatures in the Arctic Ocean region are responsible for changes such as reduced ice cover, permafrost thawing, and increased river discharge, which, together, alter nutrient and carbon cycles over the vast Arctic continental shelf. We show that the concentration of radium-228, sourced to seawater through sediment-water exchange processes, has increased substantially in surface waters of the central Arctic Ocean over the past decade. A mass balance model for Ra suggests that this increase is due to an intensification of shelf-derived material inputs to the central basin, a source that would also carry elevated concentrations of dissolved organic carbon and nutrients. Therefore, we suggest that significant changes in the nutrient, carbon, and trace metal balances of the Arctic Ocean are underway, with the potential to affect biological productivity and species assemblages in Arctic surface waters.
北冰洋地区气温上升导致了冰盖减少、永久冻土融化和河流流量增加等变化，这些变化共同改变了广阔北极大陆架上的营养物质和碳循环。我们发现，通过沉积物-水交换过程进入海水的镭-228，在过去十年中北冰洋中部表层水中的浓度大幅增加。镭的质量平衡模型表明，这种增加是由于来自大陆架的物质输入到中央盆地的强度增加，而这个来源还会携带浓度升高的溶解有机碳和营养物质。因此，我们认为北冰洋的营养物质、碳和痕量金属平衡正在发生重大变化，有可能影响北极表层水域的生物生产力和物种组合。
