On the Polar Bias in Ice Core 10Be Data
Cosmogenic radionuclide records from polar ice cores provide unique insights into past cosmic ray flux variations. They allow reconstructions of past solar activity, space weather, and geomagnetic field changes, and provide insights into past carbon cycle changes. However, all these applications rel...
Published in: | Journal of Geophysical Research: Atmospheres |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley-Blackwell
2023
|
Subjects: | |
Online Access: | https://lup.lub.lu.se/record/adefd9b6-776d-4b54-8074-210a104034e8 https://doi.org/10.1029/2022JD038203 |
id |
ftulundlup:oai:lup.lub.lu.se:adefd9b6-776d-4b54-8074-210a104034e8 |
---|---|
record_format |
openpolar |
spelling |
ftulundlup:oai:lup.lub.lu.se:adefd9b6-776d-4b54-8074-210a104034e8 2023-05-15T16:38:40+02:00 On the Polar Bias in Ice Core 10Be Data Adolphi, F. Herbst, K. Nilsson, A. Panovska, S. 2023-02-27 https://lup.lub.lu.se/record/adefd9b6-776d-4b54-8074-210a104034e8 https://doi.org/10.1029/2022JD038203 eng eng Wiley-Blackwell https://lup.lub.lu.se/record/adefd9b6-776d-4b54-8074-210a104034e8 http://dx.doi.org/10.1029/2022JD038203 scopus:85148662034 Journal of Geophysical Research: Atmospheres; 128(4), no e2022JD038203 (2023) ISSN: 2169-897X Geology Climate Research atmospheric mixing cosmogenic radionuclide ice core polar bias contributiontojournal/article info:eu-repo/semantics/article text 2023 ftulundlup https://doi.org/10.1029/2022JD038203 2023-03-15T23:27:19Z Cosmogenic radionuclide records from polar ice cores provide unique insights into past cosmic ray flux variations. They allow reconstructions of past solar activity, space weather, and geomagnetic field changes, and provide insights into past carbon cycle changes. However, all these applications rely on the proportionality of the ice core radionuclide records to the global mean production rate changes. This premise has been long debated from a model and data-perspective. Here, we address this issue through atmospheric mixing model experiments and comparison to independent data. We find that all mixing scenarios, which do not assume complete tropospheric mixing, result in a polar bias. This bias is more prominent for geomagnetic field changes than solar modulation changes. The most likely scenario, supported by independent geomagnetic field records and marine 10Be during the Laschamps geomagnetic field minimum, results in a dampening of geomagnetic field induced changes by 23%–37% and an enhancement of solar-induced changes by 7%–8%. During the Holocene, we do not find conclusive evidence for a polar bias. We propose a correction function that allows deconvolving the glacial ice core record in order to restore proportionality to the global mean signal. Article in Journal/Newspaper ice core Lund University Publications (LUP) Journal of Geophysical Research: Atmospheres 128 4 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology Climate Research atmospheric mixing cosmogenic radionuclide ice core polar bias |
spellingShingle |
Geology Climate Research atmospheric mixing cosmogenic radionuclide ice core polar bias Adolphi, F. Herbst, K. Nilsson, A. Panovska, S. On the Polar Bias in Ice Core 10Be Data |
topic_facet |
Geology Climate Research atmospheric mixing cosmogenic radionuclide ice core polar bias |
description |
Cosmogenic radionuclide records from polar ice cores provide unique insights into past cosmic ray flux variations. They allow reconstructions of past solar activity, space weather, and geomagnetic field changes, and provide insights into past carbon cycle changes. However, all these applications rely on the proportionality of the ice core radionuclide records to the global mean production rate changes. This premise has been long debated from a model and data-perspective. Here, we address this issue through atmospheric mixing model experiments and comparison to independent data. We find that all mixing scenarios, which do not assume complete tropospheric mixing, result in a polar bias. This bias is more prominent for geomagnetic field changes than solar modulation changes. The most likely scenario, supported by independent geomagnetic field records and marine 10Be during the Laschamps geomagnetic field minimum, results in a dampening of geomagnetic field induced changes by 23%–37% and an enhancement of solar-induced changes by 7%–8%. During the Holocene, we do not find conclusive evidence for a polar bias. We propose a correction function that allows deconvolving the glacial ice core record in order to restore proportionality to the global mean signal. |
format |
Article in Journal/Newspaper |
author |
Adolphi, F. Herbst, K. Nilsson, A. Panovska, S. |
author_facet |
Adolphi, F. Herbst, K. Nilsson, A. Panovska, S. |
author_sort |
Adolphi, F. |
title |
On the Polar Bias in Ice Core 10Be Data |
title_short |
On the Polar Bias in Ice Core 10Be Data |
title_full |
On the Polar Bias in Ice Core 10Be Data |
title_fullStr |
On the Polar Bias in Ice Core 10Be Data |
title_full_unstemmed |
On the Polar Bias in Ice Core 10Be Data |
title_sort |
on the polar bias in ice core 10be data |
publisher |
Wiley-Blackwell |
publishDate |
2023 |
url |
https://lup.lub.lu.se/record/adefd9b6-776d-4b54-8074-210a104034e8 https://doi.org/10.1029/2022JD038203 |
genre |
ice core |
genre_facet |
ice core |
op_source |
Journal of Geophysical Research: Atmospheres; 128(4), no e2022JD038203 (2023) ISSN: 2169-897X |
op_relation |
https://lup.lub.lu.se/record/adefd9b6-776d-4b54-8074-210a104034e8 http://dx.doi.org/10.1029/2022JD038203 scopus:85148662034 |
op_doi |
https://doi.org/10.1029/2022JD038203 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
128 |
container_issue |
4 |
_version_ |
1766028987528642560 |