Meteoric smoke concentration in the Vostok ice core estimated from superparamagnetic relaxation and some consequences for estimates of Earth accretion rate
Meteoric smoke concentration in the Vostok ice core estimated from superparamagnetic relaxation and some consequences for estimates of Earth accretion rate
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根据超顺磁弛豫估算出沃斯托克冰芯中的流星烟雾浓度以及对地球吸积率估算的一些影响
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发表时间：
2007
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影响因子：
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通讯作者：
P. Biscaye
中科院分区：
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作者：
L. Lanci;D. Kent;P. Biscaye
我们测量了来自东方冰芯的冰川和间冰期冰的磁化强度，以估计南极冰中的流星烟雾浓度。我们发现，在该方法的不确定性范围内，南极洲冰中的烟雾浓度与以前在格陵兰岛冰中测量的烟雾浓度相当。尽管格陵兰岛和南极洲的冰积累速率不同，但烟雾浓度几乎相同，这表明湿沉积是这种超小颗粒的主要沉积机制。考虑到大气气溶胶的典型清除率，这意味着以前根据干沉降对吸积率的估计有可能明显高估。
We measured the magnetization of glacial and interglacial ice from the Vostok core to estimate the meteoric smoke concentration in Antarctic ice. We have found that, within the uncertainty of the method, the smoke concentration in ice in Antarctica is equivalent to that previously measured in Greenland ice. The virtually identical smoke concentrations despite the different ice accumulation rates in Greenland and Antarctica suggest that wet deposition is the main deposition mechanism for such ultra‐small particles. Given the typical scavenging ratios for atmospheric aerosols, this would imply that previous estimates of accretion rate based on dry deposition are likely to be appreciably overestimated.