Influence of North Atlantic Oscillation on anthropogenic transport recorded in northwest Greenland ice cores
Influence of North Atlantic Oscillation on anthropogenic transport recorded in northwest Greenland ice cores
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北大西洋涛动对格陵兰岛西北部冰芯记录的人为运输的影响
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
M. Hutterli
中科院分区：
文献类型：
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作者：
J. Burkhart;R. Bales;J. McConnell;M. Hutterli
[1]从1789年至1995年期间的六个格陵兰冰芯的硝酸盐记录显示，在平均超过10年的时间内，浓度存在显著的相关性，在过去75年中，平均浓度增加了约60%。年硝酸盐通量包含主要由浓度变化驱动的低频趋势，而高频变化则由积雪变化驱动。浓度的增加产生近30%的高硝酸盐通量（2.5至3.2米克2年1）和11%的增加，在1895年至1994年期间与前100年的变化。在过去的100年中，核心中的硝酸盐趋势也与全球硝酸盐排放量相关，六个核心的平均r值为0.93。在人为影响期间，硝酸盐与北大西洋涛动呈正相关，而在此之前的相关性是负的，不太重要，这表明人为排放和北大西洋涛动之间的联系。通过奇异谱分析确定的显著的人为前周期性显示了硝酸盐记录的年代际变化，导致从平均状态变化高达30%，但没有一个像造气驱动的偏差那样大。
[1] Nitrate records from six Greenland ice cores covering the period 1789 to 1995 show a significant correlation in concentration for averaging periods greater than 10 years, as well as an approximately 60% increase in average concentration during the last 75 years. Annual nitrate fluxes contain low-frequency trends driven primarily by changes in concentration, while higher-frequency variability is driven by changes in snow accumulation. Increases in concentration yield nearly 30% higher nitrate flux (2.5 to 3.2 m gm 2 yr 1 ) and an 11% increase in variability during the 1895 to 1994 period versus the prior 100 years. Nitrate trends in the cores during the last 100 years are also correlated with global nitrate emissions, with a highly significant average r value of 0.93 for the six cores. During the period of anthropogenic influence, nitrate is positively correlated with the North Atlantic Oscillation, while prior to that the correlation is negative, and less significant, suggesting a link between transport of anthropogenic emissions and the North Atlantic Oscillation. Significant preanthropogenic periodicities identified through singular spectrum analysis show decadal variability in the nitrate record leading to shifts as great as 30% from the mean state but none as great as the anthropogenic-driven deviation.