Solar cycles and depositional processes in annual Be-10 from two varved lake sediment records
Solar cycles and depositional processes in annual Be-10 from two varved lake sediment records
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DOI：
10.1016/j.epsl.2015.07.037
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发表时间：
2015-10
影响因子：
5.3
通讯作者：
M. Czymzik;R. Muscheler;A. Brauer;F. Adolphi;F. Ott;U. Kienel;N. Dräger;M. Słowiński;A. Aldahan;G. Possnert
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文献类型：
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作者：
M. Czymzik;R. Muscheler;A. Brauer;F. Adolphi;F. Ott;U. Kienel;N. Dräger;M. Słowiński;A. Aldahan;G. Possnert
在1983年至2009年期间(∼第22和23个太阳周期)，测量了泰费尔西湖(TSK)和捷克豪斯基湖(JC)不同沉积岩芯中10种铍浓度(10Be)的年分辨率。根据来自同一档案的替代记录以及反映大气放射性核素产生的太阳强迫变化的当地降水和中子监测数据对10Be CON时间序列进行校准，从而能够(1)查明主要的沉积过程，(2)评估太阳活动重建的潜力。TSK和JC沉积物中的10Be CON与不同的中子监测计数(TSK：r=0.5，p=0.05，n=16；JC：r=0.46，p=0.03，n=22)显著相关。然而，与TSK有机碳含量变化以及JC有机碳和碎屑物质含量变化的进一步相关性表明，10Be时间序列具有流域特有的偏倚。为了尝试校正这些偏差，应用多元回归分析来提取大气10Be产生信号(10Be大气)。为了提高信噪比，从TSK和JC10Be大气时间序列计算了10Be合成记录(10Be合成)。10Be合成与中子监测记录的变化显著相关(r=0.49，p=0.01，n=25)，并与太阳周极小值和极大值之间10Be产生的预期幅度变化相匹配。这项对两个地点的10Be的定标研究表明，在不同的湖泊沉积物中，10Be在太阳活动重建方面具有巨大的潜力，但也有一定的局限性。
Abstract Beryllium 10 concentrations (10 Be con) were measured at annual resolution from varved sediment cores of Lakes Tiefer See (TSK) and Czechowskie (JC) for the period 1983–2009 (∼ solar cycles 22 and 23). Calibrating the 10 Be con time-series against complementing proxy records from the same archive as well as local precipitation and neutron monitor data, reflecting solar forced changes in atmospheric radionuclide production, allowed (i) identifying the main depositional processes and (ii) evaluating the potential for solar activity reconstruction. 10 Be con in TSK and JC sediments are significantly correlated to varying neutron monitor counts (TSK: r= 0.5, p= 0.05, n= 16; JC: r= 0.46, p= 0.03, n= 22). However, the further correlations with changes in organic carbon contents in TSK as well as varying organic carbon and detrital matter contents in JC point to catchment specific biases in the 10 Be con time-series. In an attempt to correct for these biases multiple regression analysis was applied to extract an atmospheric 10 Be production signal (10 Be atmosphere). To increase the signal to noise ratio a 10 Be composite record (10 Be composite) was calculated from the TSK and JC 10 Be atmosphere time-series. 10 Be composite is significantly correlated to variations in the neutron monitor record (r= 0.49, p= 0.01, n= 25) and matches the expected amplitude changes in 10 Be production between solar cycle minima and maxima. This calibration study on 10 Be from two sites indicates the large potential but also, partly site-specific, limitations of 10 Be in varved lake sediments for solar activity reconstruction.