北极洋是大西洋沉积在大西洋中的人为的净水槽
Stephan Krisch1,2, Arianna Olivelli3,4,5, Loes J A Gerringa6
1Technical University of Braunschweig, Braunschweig, Germany. stephan.krisch@tu-braunschweig.de.
Nature communications
|December 17, 2025
概括
北冰洋是来自北大西洋的溶化 (dPb) 的重要沉池,接收的dPb流量相当于河流输入量. 同位素分析显示,这种dPb来源于北美和欧亚大陆的人为排放.
科学领域:
- 环境科学 环境科学
- 海洋学 海洋学 海洋学
- 地质化学 地质化学
背景情况:
- 人类活动将数百万的 (Pb) 释放到大气中.
- 北大西洋受到大气中的Pb沉积的严重影响.
- 海流在大西洋中分散溶化 (dPb) 的作用仍然不太清楚.
研究的目的:
- 量化从北大西洋到北冰洋的溶化 (dPb) 流量.
- 为了确定北冰洋是否充当大西洋dPb.的水槽或来源.
- 追踪dPb在北冰洋的起源,并了解历史的Pb沉积模式.
主要方法:
- 海洋学建模用于估计dPb流量.
- 分析同位素比率 (例如,206Pb/207Pb) 以确定Pb来源.
- 当前dPb流量与历史数据和河流输入数据的比较.
主要成果:
- 北冰洋在2015/2016年从北大西洋获得了估计611±74Mg·a-1的dPb.
- 北极洋是大西洋dPb的净沉没地,流量为378 ± 85 Mg·a−1.1.
- 北极河流的dPb排放量估计为344 ± 222 Mg·a−1,相当于北大西洋流量.
- 同位素数据证实了来自北美和欧亚的人类来源.
- 北大西洋的Pb度表明,与2015/2016相比,在20世纪80年代末的dPb流量增加了约5倍.
结论:
- 北冰洋是北大西洋中溶解的的重要,以前未被识别的沉池.
- 海流在北极地区人为的运输和沉积中起着至关重要的作用.
- 历史上含汽油排放导致北极深沉积物的广泛污染,过去的流量显著增加.
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