Possible link between multi-decadal climate cycles and periodic reversals of solar magnetic field polarity
Possible link between multi-decadal climate cycles and periodic reversals of solar magnetic field polarity
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DOI：
10.1016/j.epsl.2008.04.050
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发表时间：
2008-07-30
影响因子：
5.3
通讯作者：
Masuda, Kimiald
中科院分区：
文献类型：
--
作者：
Miyahara, Hiroko;Yokoyama, Yusuke;Masuda, Kimiald
多年气候变率和太阳活动之间的联系长期以来一直存在争议，其依据是来自大量仪器记录和代用记录的观测证据。很难评估每个太阳参数对气候变化的确切作用，因为仪器测量的太阳相关参数，如太阳总辐照度（TSI），紫外线（UV），太阳风和银河宇宙线（GCR）通量或多或少是同步的，并且只能追溯到几十年前。在这里，我们报告的树木年轮碳-14记录的11年/22年的太阳周期在蒙德极小期（17世纪）和中世纪早期的极大期（9- 10世纪）重建太阳的状态和传入GCR的通量。这一结果有力地表明，太阳活动周期对气候的影响在仪器观测开始后的一段时间内是持续的。我们发现，太阳活动周期的实际长度随长期太阳活动状况的变化而变化，地表气温的周期性也在同步变化。一般来说，22年周期的温度变化似乎比11年周期的温度变化更显著，特别是在太阳活动极小期（如蒙德极小期（1645-1715 AD））附近。在这项研究中发现的冷却事件的极性依赖性表明，GCR不能被排除在可能的驱动器的十年到几十年的气候变化。(C)2008 Elsevier B. V.保留所有权利。
The linkage between multi-decadal climate variability and activity of the sun has been long debated based upon observational evidence from a large number of instrumental and proxy records. It is difficult to evaluate the exact role of each of solar parameters on climate change since instrumentally measured solar related parameters such as Total Solar irradiance (TSI), Ultra Violet (UV), solar wind and Galactic Cosmic Rays (GCRs) fluxes are more or less synchronized and only extend back for several decades. Here we report tree-ring Carbon-14 based record of 11-year/22-year solar cycles during the Maunder Minimum (17th century) and the early Medieval Maximum Period (9-10th century) to reconstruct the state of the sun and the flux of incoming GCRs. The result strongly indicates that the influence of solar cycles on climate is persistent beyond the period after instrumental observations were initiated. We find that the actual lengths of solar cycles vary depending on the status of long-term solar activity, and that periodicity of the surface air temperatures are also changing synchronously. Temperature variations over the 22-year cycles seem, in general, to be more significant than those associated with the 11-year cycles and in particular around the grand solar minima such as the Maunder Minimum (1645-1715 AD). The polarity dependence of cooling events found in this study suggests that the GCRs can not be excluded from the possible drivers of decadal to multi-decadal climate change. (C) 2008 Elsevier B.V. All rights reserved.