Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Modeling Atmospheric Transport of Cosmogenic Radionuclide 10Be Using GEOS-Chem 14.1.1 and ECHAM6.3-HAM2.3 : Implications for Solar and Geomagnetic Reconstructions

Zheng, Minjie LU ; Adolphi, Florian ; Ferrachat, Sylvaine ; Mekhaldi, Florian LU ; Lu, Zhengyao LU ; Nilsson, Andreas LU and Lohmann, Ulrike (2024) In Geophysical Research Letters 51(2).
Abstract

A prerequisite to applying 10Be in natural archives for solar and geomagnetic reconstructions is to know how 10Be deposition reflects atmospheric production changes. However, this relationship remains debated. To address this, we use two state-of-the-art global models GEOS-Chem and ECHAM6.3-HAM2.3 with the latest beryllium production model. During solar modulation, both models suggest that 10Be deposition reacts proportionally to global production changes, with minor latitudinal deposition biases (<5%). During geomagnetic modulation, however, 10Be deposition changes are enhanced by ∼15% in the tropics and attenuated by 20%–35% in subtropical and polar regions compared to global production... (More)

A prerequisite to applying 10Be in natural archives for solar and geomagnetic reconstructions is to know how 10Be deposition reflects atmospheric production changes. However, this relationship remains debated. To address this, we use two state-of-the-art global models GEOS-Chem and ECHAM6.3-HAM2.3 with the latest beryllium production model. During solar modulation, both models suggest that 10Be deposition reacts proportionally to global production changes, with minor latitudinal deposition biases (<5%). During geomagnetic modulation, however, 10Be deposition changes are enhanced by ∼15% in the tropics and attenuated by 20%–35% in subtropical and polar regions compared to global production changes. Such changes are also hemispherically asymmetric, attributed to asymmetric production between hemispheres. For the solar proton event in 774/5 CE, 10Be shows a 15% higher deposition increase in polar regions than in tropics. This study highlights the importance of atmospheric mixing when comparing 10Be from different locations or to independent geomagnetic field records.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
atmospheric transport, cosmogenic radionuclides, ECHAM6.3-HAM2.3, GEOS-Chem, solar and geomagnetic reconstructions
in
Geophysical Research Letters
volume
51
issue
2
article number
e2023GL106642
publisher
American Geophysical Union (AGU)
external identifiers
  • scopus:85182835090
ISSN
0094-8276
DOI
10.1029/2023GL106642
language
English
LU publication?
yes
id
f3705687-a617-4eae-b442-c282df8000e8
date added to LUP
2024-04-10 14:26:11
date last changed
2024-04-10 14:27:12
@article{f3705687-a617-4eae-b442-c282df8000e8,
  abstract     = {{<p>A prerequisite to applying <sup>10</sup>Be in natural archives for solar and geomagnetic reconstructions is to know how <sup>10</sup>Be deposition reflects atmospheric production changes. However, this relationship remains debated. To address this, we use two state-of-the-art global models GEOS-Chem and ECHAM6.3-HAM2.3 with the latest beryllium production model. During solar modulation, both models suggest that <sup>10</sup>Be deposition reacts proportionally to global production changes, with minor latitudinal deposition biases (&lt;5%). During geomagnetic modulation, however, <sup>10</sup>Be deposition changes are enhanced by ∼15% in the tropics and attenuated by 20%–35% in subtropical and polar regions compared to global production changes. Such changes are also hemispherically asymmetric, attributed to asymmetric production between hemispheres. For the solar proton event in 774/5 CE, <sup>10</sup>Be shows a 15% higher deposition increase in polar regions than in tropics. This study highlights the importance of atmospheric mixing when comparing <sup>10</sup>Be from different locations or to independent geomagnetic field records.</p>}},
  author       = {{Zheng, Minjie and Adolphi, Florian and Ferrachat, Sylvaine and Mekhaldi, Florian and Lu, Zhengyao and Nilsson, Andreas and Lohmann, Ulrike}},
  issn         = {{0094-8276}},
  keywords     = {{atmospheric transport; cosmogenic radionuclides; ECHAM6.3-HAM2.3; GEOS-Chem; solar and geomagnetic reconstructions}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{2}},
  publisher    = {{American Geophysical Union (AGU)}},
  series       = {{Geophysical Research Letters}},
  title        = {{Modeling Atmospheric Transport of Cosmogenic Radionuclide <sup>10</sup>Be Using GEOS-Chem 14.1.1 and ECHAM6.3-HAM2.3 : Implications for Solar and Geomagnetic Reconstructions}},
  url          = {{http://dx.doi.org/10.1029/2023GL106642}},
  doi          = {{10.1029/2023GL106642}},
  volume       = {{51}},
  year         = {{2024}},
}