Variations of Solar Activity and Climate during the Past 1200 Years
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- MIYAHARA Hiroko
- Institute for Cosmic Ray Research, The University of Tokyo
Bibliographic Information
- Other Title
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- 過去1200年間における太陽活動および宇宙線変動と気候変動との関わり
- カコ 1200ネンカン ニ オケル タイヨウ カツドウ オヨビ ウチュウセン ヘンドウ ト キコウ ヘンドウ ト ノ カカワリ
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Abstract
The relationship between solar activity and climate change in the past can be examined using proxy records. Variations of solar activity can be reconstructed based on carbon-14 in tree rings, which are produced by galactic cosmic rays modulated by the solar wind, while climate change can be reconstructed from changes of tree-ring growth rate or content of stable isotopes in ice cores from the polar region. A comparison of solar activity and climate change at the Maunder Minimum in the 17th century and the Early Medieval Maximum Period in the 9-10th century suggests that the sun plays an important role in climate change even on a decadal time scale. The characteristic variations detected in climate change suggest the mechanism of solar influence on climate involves galactic cosmic rays. Variable features of eleven-year and twenty-two year cycles of solar activity and consequent variations of cosmic rays are possible origins of complex variations of climate change on decadal to multi-decadal time scales. We summarize variations of solar activity and cosmic rays during the past 1200 years and their possible influence on climate change.
Journal
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- Journal of Geography (Chigaku Zasshi)
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Journal of Geography (Chigaku Zasshi) 119 (3), 510-518, 2010
Tokyo Geographical Society
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Details 詳細情報について
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- CRID
- 1390001204229041664
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- NII Article ID
- 10030369529
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- NII Book ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL BIB ID
- 10757698
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed