High-resolution records of the beryllium-10 solar activity proxy in ice from Law Dome, East Antarctica: measurement, reproducibility and principal trends
High-resolution records of the beryllium-10 solar activity proxy in ice from Law Dome, East Antarctica: measurement, reproducibility and principal trends
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南极洲东部劳多姆冰中铍 10 太阳活动代理的高分辨率记录：测量、再现性和主要趋势
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发表时间：
2011
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通讯作者：
M. Curran
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作者：
J. Pedro;Andrew M. Smith;K. Simon;T. Ommen;M. Curran
摘要。在南极东部劳多姆的冰核点Dome Summit South （DSS）记录了三个近月分辨率的10Be记录。描述了这些记录的化学制备和加速器质谱仪（AMS）测量。DSS 10Be记录的再现性通过将冰芯数据与两个先前发表的和同期的雪坑数据进行对比来评估。我们发现这五种记录大体一致，与现场其他痕量化学记录的一致程度相当。这一结果缓解了先前南极研究（moral et al., 2005）对冰芯10Be记录重复性差的担忧。从三个冰芯构建了一个单一的复合序列，提供了过去十年（1999 - 2009）DSS的10Be浓度的月度分辨率记录。据我们所知，这是第一次公布的冰芯数据，涵盖了最近太阳活动周期23的异常太阳极小期。10Be浓度与麦克默多中子监测器记录的宇宙射线通量显著相关（rxy = 0.64, 95% CI为0.53至0.71），这表明太阳对大气产生速率的调制可能解释DSS中10Be浓度变化的高达40%。在夏季至秋季的大多数年份中，可能由于平流层的入侵而出现浓度高峰。我们的研究结果强调了在冰芯10Be数据中同时存在生产和气象信号。
Abstract. Three near-monthly resolution 10Be records are presented from the Dome Summit South (DSS) ice core site, Law Dome, East Antarctica. The chemical preparation and Accelerator Mass Spectrometer (AMS) measurement of these records is described. The reproducibility of 10Be records at DSS is assessed through intercomparison of the ice core data with data from two previously published and contemporaneous snow pits. We find generally good agreement between the five records, comparable to that observed between other trace chemical records from the site. This result allays concerns raised by a previous Antarctic study (Moraal et al., 2005) about poor reproducibility of ice core 10Be records. A single composite series is constructed from the three ice cores providing a monthly-resolved record of 10Be concentrations at DSS over the past decade (1999 to 2009). To our knowledge, this is the first published ice core data spanning the recent exceptional solar minimum of solar cycle 23. 10Be concentrations are significantly correlated to the cosmic ray flux recorded by the McMurdo neutron monitor (rxy = 0.64, with 95 % CI of 0.53 to 0.71), suggesting that solar modulation of the atmospheric production rate may explain up to ~40 % of the variance in 10Be concentrations at DSS. Sharp concentration peaks occur in most years during the summer-to-autumn, possibly caused by stratospheric incursions. Our results underscore the presence of both production and meteorological signals in ice core 10Be data.