Solar and climate signals revealed by seasonal 10Be data from the NEEM ice core project for the neutron monitor period
Zheng, Minjie LU ; Adolphi, Florian LU ; Sjolte, Jesper LU
; Aldahan, Ala
; Possnert, Göran
; Wu, Mousong
LU
; Chen, Peng
LU
and Muscheler, Raimund
LU
(2020)
In Earth and Planetary Science Letters
541.
- Abstract
10Be in ice cores has been instrumental for reconstructing past changes in solar activity prior to direct observations. For a robust use of these records, it is pivotal to understand the 10Be transport and deposition. However, there are only few high-resolution seasonal 10Be data longer than one full solar cycle (11 years) that could enable a quantification of the influences of atmospheric circulation and deposition processes on the 10Be signal in ice. Here we present a seasonally resolved 10Be data set covering the neutron monitor period (1951–2002) from a firn core connected to the NEEM (North Greenland Eemian Ice Drilling) project. The results suggest that both summer and winter... (More)
10Be in ice cores has been instrumental for reconstructing past changes in solar activity prior to direct observations. For a robust use of these records, it is pivotal to understand the 10Be transport and deposition. However, there are only few high-resolution seasonal 10Be data longer than one full solar cycle (11 years) that could enable a quantification of the influences of atmospheric circulation and deposition processes on the 10Be signal in ice. Here we present a seasonally resolved 10Be data set covering the neutron monitor period (1951–2002) from a firn core connected to the NEEM (North Greenland Eemian Ice Drilling) project. The results suggest that both summer and winter 10Be reflect the production signal induced by solar modulation of galactic cosmic rays. However, superimposed on this solar signal we find additional meteorologically driven influences on 10Be transport and deposition. We found that the tropopause pressure over 30°N represents an important factor influencing NEEM 10Be concentrations on seasonal and annual scales. 10Be deposited in summer also correlates significantly with the tropopause pressure over Greenland suggesting a direct contribution of stratospheric intrusions during summer to the 10Be deposition in Greenland. To correct for these transport/deposition influences, we apply a first-order correction to the 10Be data using a multi-linear regression model. The “climate-corrected” 10Be data shows a comparable skill for reconstructing production rate changes as the 10Be composite record from five different ice cores in Greenland. The results suggest that the correction approach can be a complementary method to the stacking to better isolate the production rate signal from the 10Be data when only limited data are available.
(Less)
- author
- Zheng, Minjie
LU
; Adolphi, Florian
LU
; Sjolte, Jesper
LU
; Aldahan, Ala
; Possnert, Göran
; Wu, Mousong
LU
; Chen, Peng
LU
and Muscheler, Raimund
LU
- organization
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- climate and solar signal, cosmogenic radionuclides, NEEM firn core, seasonally resolved Be
- in
- Earth and Planetary Science Letters
- volume
- 541
- article number
- 116273
- publisher
- Elsevier
- external identifiers
-
- scopus:85084186941
- ISSN
- 0012-821X
- DOI
- 10.1016/j.epsl.2020.116273
- project
- Disentangling climate influence and production rate on 10Be deposition in the polar region over the last 150 yrs
- Disentangling production and climate signals from high-resolution Beryllium records: implications for solar and geomagnetic reconstructions
- language
- English
- LU publication?
- yes
- id
- 1c4cf35b-ca45-4c92-a9d3-22640b4d2fe0
- date added to LUP
- 2020-06-02 09:47:29
- date last changed
- 2022-05-12 02:49:30
@article{1c4cf35b-ca45-4c92-a9d3-22640b4d2fe0,
abstract = {{<p><sup>10</sup>Be in ice cores has been instrumental for reconstructing past changes in solar activity prior to direct observations. For a robust use of these records, it is pivotal to understand the <sup>10</sup>Be transport and deposition. However, there are only few high-resolution seasonal <sup>10</sup>Be data longer than one full solar cycle (11 years) that could enable a quantification of the influences of atmospheric circulation and deposition processes on the <sup>10</sup>Be signal in ice. Here we present a seasonally resolved <sup>10</sup>Be data set covering the neutron monitor period (1951–2002) from a firn core connected to the NEEM (North Greenland Eemian Ice Drilling) project. The results suggest that both summer and winter <sup>10</sup>Be reflect the production signal induced by solar modulation of galactic cosmic rays. However, superimposed on this solar signal we find additional meteorologically driven influences on <sup>10</sup>Be transport and deposition. We found that the tropopause pressure over 30°N represents an important factor influencing NEEM <sup>10</sup>Be concentrations on seasonal and annual scales. <sup>10</sup>Be deposited in summer also correlates significantly with the tropopause pressure over Greenland suggesting a direct contribution of stratospheric intrusions during summer to the <sup>10</sup>Be deposition in Greenland. To correct for these transport/deposition influences, we apply a first-order correction to the <sup>10</sup>Be data using a multi-linear regression model. The “climate-corrected” <sup>10</sup>Be data shows a comparable skill for reconstructing production rate changes as the <sup>10</sup>Be composite record from five different ice cores in Greenland. The results suggest that the correction approach can be a complementary method to the stacking to better isolate the production rate signal from the <sup>10</sup>Be data when only limited data are available.</p>}},
author = {{Zheng, Minjie and Adolphi, Florian and Sjolte, Jesper and Aldahan, Ala and Possnert, Göran and Wu, Mousong and Chen, Peng and Muscheler, Raimund}},
issn = {{0012-821X}},
keywords = {{climate and solar signal; cosmogenic radionuclides; NEEM firn core; seasonally resolved Be}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Earth and Planetary Science Letters}},
title = {{Solar and climate signals revealed by seasonal <sup>10</sup>Be data from the NEEM ice core project for the neutron monitor period}},
url = {{http://dx.doi.org/10.1016/j.epsl.2020.116273}},
doi = {{10.1016/j.epsl.2020.116273}},
volume = {{541}},
year = {{2020}},
}