Solar Activity of the Past 100 Years Inferred From 10Be in Ice Cores—Implications for Long-Term Solar Activity Reconstructions
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 (North Greenland Eemian Ic...
Published in: | Geophysical Research Letters |
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Language: | English |
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American Geophysical Union (AGU)
2021
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Online Access: | https://lup.lub.lu.se/record/fb72753c-434d-4162-aa02-8ba2699a4519 https://doi.org/10.1029/2020GL090896 |
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ftulundlup:oai:lup.lub.lu.se:fb72753c-434d-4162-aa02-8ba2699a4519 2023-05-15T13:34:07+02:00 Solar Activity of the Past 100 Years Inferred From 10Be in Ice Cores—Implications for Long-Term Solar Activity Reconstructions Zheng, Minjie Adolphi, Florian Sjolte, Jesper Aldahan, Ala Possnert, Göran Wu, Mousong Chen, Peng Muscheler, Raimund 2021-02 https://lup.lub.lu.se/record/fb72753c-434d-4162-aa02-8ba2699a4519 https://doi.org/10.1029/2020GL090896 eng eng American Geophysical Union (AGU) https://lup.lub.lu.se/record/fb72753c-434d-4162-aa02-8ba2699a4519 http://dx.doi.org/10.1029/2020GL090896 scopus:85101498734 Geophysical Research Letters; 48(4), no e2020GL090896 (2021) ISSN: 0094-8276 Earth and Related Environmental Sciences Dye3 ice core NEEM neutron monitor data seasonally resolved Be solar reconstructions contributiontojournal/letter info:eu-repo/semantics/article text 2021 ftulundlup https://doi.org/10.1029/2020GL090896 2023-02-22T23:27:11Z 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 (North Greenland Eemian Ice Drilling [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 2,000 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland ice core NGRIP North Greenland Lund University Publications (LUP) Antarctic Greenland Geophysical Research Letters 48 4 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Earth and Related Environmental Sciences Dye3 ice core NEEM neutron monitor data seasonally resolved Be solar reconstructions |
spellingShingle |
Earth and Related Environmental Sciences Dye3 ice core NEEM neutron monitor data seasonally resolved Be solar reconstructions Zheng, Minjie Adolphi, Florian Sjolte, Jesper Aldahan, Ala Possnert, Göran Wu, Mousong Chen, Peng Muscheler, Raimund Solar Activity of the Past 100 Years Inferred From 10Be in Ice Cores—Implications for Long-Term Solar Activity Reconstructions |
topic_facet |
Earth and Related Environmental Sciences Dye3 ice core NEEM neutron monitor data seasonally resolved Be solar reconstructions |
description |
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 (North Greenland Eemian Ice Drilling [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 2,000 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. |
format |
Article in Journal/Newspaper |
author |
Zheng, Minjie Adolphi, Florian Sjolte, Jesper Aldahan, Ala Possnert, Göran Wu, Mousong Chen, Peng Muscheler, Raimund |
author_facet |
Zheng, Minjie Adolphi, Florian Sjolte, Jesper Aldahan, Ala Possnert, Göran Wu, Mousong Chen, Peng Muscheler, Raimund |
author_sort |
Zheng, Minjie |
title |
Solar Activity of the Past 100 Years Inferred From 10Be in Ice Cores—Implications for Long-Term Solar Activity Reconstructions |
title_short |
Solar Activity of the Past 100 Years Inferred From 10Be in Ice Cores—Implications for Long-Term Solar Activity Reconstructions |
title_full |
Solar Activity of the Past 100 Years Inferred From 10Be in Ice Cores—Implications for Long-Term Solar Activity Reconstructions |
title_fullStr |
Solar Activity of the Past 100 Years Inferred From 10Be in Ice Cores—Implications for Long-Term Solar Activity Reconstructions |
title_full_unstemmed |
Solar Activity of the Past 100 Years Inferred From 10Be in Ice Cores—Implications for Long-Term Solar Activity Reconstructions |
title_sort |
solar activity of the past 100 years inferred from 10be in ice cores—implications for long-term solar activity reconstructions |
publisher |
American Geophysical Union (AGU) |
publishDate |
2021 |
url |
https://lup.lub.lu.se/record/fb72753c-434d-4162-aa02-8ba2699a4519 https://doi.org/10.1029/2020GL090896 |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Antarctica Greenland ice core NGRIP North Greenland |
genre_facet |
Antarc* Antarctic Antarctica Greenland ice core NGRIP North Greenland |
op_source |
Geophysical Research Letters; 48(4), no e2020GL090896 (2021) ISSN: 0094-8276 |
op_relation |
https://lup.lub.lu.se/record/fb72753c-434d-4162-aa02-8ba2699a4519 http://dx.doi.org/10.1029/2020GL090896 scopus:85101498734 |
op_doi |
https://doi.org/10.1029/2020GL090896 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
4 |
_version_ |
1766049053977608192 |