Temporal controls on silicic acid utilisation along the West Antarctic Peninsula.
Temporal controls on silicic acid utilisation along the West Antarctic Peninsula.
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DOI：
10.1038/ncomms14645
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发表时间：
2017-03-13
影响因子：
16.6
通讯作者：
Snelling AM
中科院分区：
文献类型：
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作者：
Swann GE;Pike J;Leng MJ;Sloane HJ;Snelling AM
在过去的半个世纪里，由于大气/海洋变暖和冰川融化的增加，气候变化沿着南极半岛的影响受到了广泛的辩论。人们特别关注这些变化对海洋生态系统的影响，不仅是对初级生产者的影响，而且对较高的营养级的影响。在这里，我们提出了一个记录，详细的历史控制在西南极洲半岛边缘，现代浮游植物环境的季节性海冰的限制，对硅酸[Si（OH）4]的地球化学循环。我们表明，Si（OH）4循环通过全新世之间的交替主要是由海冰或冰川放电从周围接地冰盖。随着进一步的气候驱动的变化和融化的预测，为21世纪，我们的研究结果文件的潜在地球化学循环和多营养相互作用沿着半岛越来越受到冰川排放，改变食物网的相互作用。海冰在调节南极半岛边缘沿着的营养动态和初级生产力方面起着关键作用。在这里，作者表明，在过去的13 kyr营养动态也受到冰川排放的调节，突出了未来变化的潜力，因为冰川继续融化。
The impact of climatic change along the Antarctica Peninsula has been widely debated in light of atmospheric/oceanic warming and increases in glacial melt over the past half century. Particular concern exists over the impact of these changes on marine ecosystems, not only on primary producers but also on higher trophic levels. Here we present a record detailing of the historical controls on the biogeochemical cycling of silicic acid [Si(OH)4] on the west Antarctica Peninsula margin, a region in which the modern phytoplankton environment is constrained by seasonal sea ice. We demonstrate that Si(OH)4 cycling through the Holocene alternates between being primarily regulated by sea ice or glacial discharge from the surrounding grounded ice sheet. With further climate-driven change and melting forecast for the twenty-first century, our findings document the potential for biogeochemical cycling and multi-trophic interactions along the peninsula to be increasingly regulated by glacial discharge, altering food-web interactions. Sea-ice plays a key role in regulating nutrient dynamics and primary productivity along the Antarctica Peninsula margin. Here, the authors show that over the last 13 kyr nutrient dynamics have also been regulated by glacial discharge, highlighting the potential for future changes as glaciers continue to melt.