Solar activity of the past 100 years inferred from <sup>10</sup>Be in ice cores – implications for long‐term solar activity reconstructions

doi:10.1029/2020GL090896

Differences between ¹⁰Be records from Greenland and Antarctica over the last 100 years have led to different conclusions about past changes in solar activity. The reasons for this disagreement remain unresolved. We analyze a seasonally resolved ¹⁰Be record from a firn core (NEEM ice core project) in Northwestern Greenland for 1887‐2002. By comparing the NEEM data to ¹⁰Be data from the NGRIP and Dye3 ice cores, we find that the Dye3 data after 1958 are significantly lower. These low values lead to a normalization problem in solar reconstructions when connecting ¹⁰Be variations to modern observations. Excluding these data strongly reduces the differences between solar reconstructions over the last 2000 years based on Greenland and Antarctic ¹⁰Be data. Furthermore, ¹⁰Be records from polar regions and group sunspot numbers do not support a substantial increase in solar activity for the 1937‐1950 period as proposed by previous extensions of the neutron monitor data.

DOI	10.1029/2020GL090896
	Solar activity of the past 100 years inferred from ¹⁰Be in ice cores – implications for long‐term solar activity reconstructions
	Minjie Zheng; Florian Adolphi; Jesper Sjolte; Ala Aldahan; Gö; ran Possnert; Mousong Wu; Peng Chen; Raimund Muscheler
	2021-01-12
发表期刊	Geophysical Research Letters
出版年	2021
英文摘要	Differences between ¹⁰Be records from Greenland and Antarctica over the last 100 years have led to different conclusions about past changes in solar activity. The reasons for this disagreement remain unresolved. We analyze a seasonally resolved ¹⁰Be record from a firn core (NEEM ice core project) in Northwestern Greenland for 1887‐2002. By comparing the NEEM data to ¹⁰Be data from the NGRIP and Dye3 ice cores, we find that the Dye3 data after 1958 are significantly lower. These low values lead to a normalization problem in solar reconstructions when connecting ¹⁰Be variations to modern observations. Excluding these data strongly reduces the differences between solar reconstructions over the last 2000 years based on Greenland and Antarctic ¹⁰Be data. Furthermore, ¹⁰Be records from polar regions and group sunspot numbers do not support a substantial increase in solar activity for the 1937‐1950 period as proposed by previous extensions of the neutron monitor data. This article is protected by copyright. All rights reserved.
领域	气候变化
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/311362
专题	气候变化
推荐引用方式 GB/T 7714	Minjie Zheng,Florian Adolphi,Jesper Sjolte,等. Solar activity of the past 100 years inferred from ¹⁰Be in ice cores – implications for long‐term solar activity reconstructions[J]. Geophysical Research Letters,2021.
APA	Minjie Zheng.,Florian Adolphi.,Jesper Sjolte.,Ala Aldahan.,Gö.,...&Raimund Muscheler.(2021).Solar activity of the past 100 years inferred from ¹⁰Be in ice cores – implications for long‐term solar activity reconstructions.Geophysical Research Letters.
MLA	Minjie Zheng,et al."Solar activity of the past 100 years inferred from ¹⁰Be in ice cores – implications for long‐term solar activity reconstructions".Geophysical Research Letters (2021).

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