Simulating ice core Be-10 on the glacial-interglacial timescale
Abstract. 10Be ice core measurements are an important tool for paleoclimate research, e.g., allowing for the reconstruction of past solar activity or changes in the geomagnetic dipole field. However, especially on multi-millennial timescales, the share of production and climate-induced variations of...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/153354 2024-01-14T10:07:16+01:00 Simulating ice core Be-10 on the glacial-interglacial timescale Elsasser, Christoph Wagenbach, Dietmar Levin, I. Stanzick, A. Christl, M Wallner, Anton Kipfstuhl, Sepp Seierstad, I.K. Wershofen, H Dibb, J. application/pdf http://hdl.handle.net/1885/153354 https://doi.org/10.5194/cp-11-115-2015 https://openresearch-repository.anu.edu.au/bitstream/1885/153354/5/01_Elsasser_Simulating_ice_core_Be-10_on_2015.pdf.jpg unknown Copernicus GmbH 1814-9324 http://hdl.handle.net/1885/153354 doi:10.5194/cp-11-115-2015 https://openresearch-repository.anu.edu.au/bitstream/1885/153354/5/01_Elsasser_Simulating_ice_core_Be-10_on_2015.pdf.jpg Climate of the Past Keywords: atmospheric transport geomagnetism glacial-interglacial cycle Holocene ice core paleoclimate radionuclide snow accumulation solar activity timescale Journal article ftanucanberra https://doi.org/10.5194/cp-11-115-2015 2023-12-15T09:36:27Z Abstract. 10Be ice core measurements are an important tool for paleoclimate research, e.g., allowing for the reconstruction of past solar activity or changes in the geomagnetic dipole field. However, especially on multi-millennial timescales, the share of production and climate-induced variations of respective 10Be ice core records is still up for debate. Here we present the first quantitative climatological model of the 10Be ice concentration up to the glacial–interglacial timescale. The model approach is composed of (i) a coarse resolution global atmospheric transport model and (ii) a local 10Be air–firn transfer model. Extensive global-scale observational data of short-lived radionuclides as well as new polar 10Be snow-pit measurements are used for model calibration and validation. Being specifically configured for 10Be in polar ice, this tool thus allows for a straightforward investigation of production- and non-production-related modulation of this nuclide. We find that the polar 10Be ice concentration does not immediately record the globally mixed cosmogenic production signal. Using geomagnetic modulation and revised Greenland snow accumulation rate changes as model input, we simulate the observed Greenland Summit (GRIP and GISP2) 10Be ice core records over the last 75 kyr (on the GICC05modelext timescale). We show that our basic model is capable of reproducing the largest portion of the observed 10Be changes. However, model–measurement differences exhibit multi-millennial trends (differences up to 87% in case of normalized to the Holocene records) which call for closer investigation. Focusing on the (12–37) b2k (before the year AD 2000) period, mean model–measurement differences of 30% cannot be attributed to production changes. However, unconsidered climate-induced changes could likely explain the model–measurement mismatch. In fact, the 10Be ice concentration is very sensitive to snow accumulation changes. Here the reconstructed Greenland Summit (GRIP) snow accumulation rate record would require ... Article in Journal/Newspaper Greenland GRIP ice core Australian National University: ANU Digital Collections Greenland Climate of the Past 11 2 115 133 |
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Open Polar |
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Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: atmospheric transport geomagnetism glacial-interglacial cycle Holocene ice core paleoclimate radionuclide snow accumulation solar activity timescale |
spellingShingle |
Keywords: atmospheric transport geomagnetism glacial-interglacial cycle Holocene ice core paleoclimate radionuclide snow accumulation solar activity timescale Elsasser, Christoph Wagenbach, Dietmar Levin, I. Stanzick, A. Christl, M Wallner, Anton Kipfstuhl, Sepp Seierstad, I.K. Wershofen, H Dibb, J. Simulating ice core Be-10 on the glacial-interglacial timescale |
topic_facet |
Keywords: atmospheric transport geomagnetism glacial-interglacial cycle Holocene ice core paleoclimate radionuclide snow accumulation solar activity timescale |
description |
Abstract. 10Be ice core measurements are an important tool for paleoclimate research, e.g., allowing for the reconstruction of past solar activity or changes in the geomagnetic dipole field. However, especially on multi-millennial timescales, the share of production and climate-induced variations of respective 10Be ice core records is still up for debate. Here we present the first quantitative climatological model of the 10Be ice concentration up to the glacial–interglacial timescale. The model approach is composed of (i) a coarse resolution global atmospheric transport model and (ii) a local 10Be air–firn transfer model. Extensive global-scale observational data of short-lived radionuclides as well as new polar 10Be snow-pit measurements are used for model calibration and validation. Being specifically configured for 10Be in polar ice, this tool thus allows for a straightforward investigation of production- and non-production-related modulation of this nuclide. We find that the polar 10Be ice concentration does not immediately record the globally mixed cosmogenic production signal. Using geomagnetic modulation and revised Greenland snow accumulation rate changes as model input, we simulate the observed Greenland Summit (GRIP and GISP2) 10Be ice core records over the last 75 kyr (on the GICC05modelext timescale). We show that our basic model is capable of reproducing the largest portion of the observed 10Be changes. However, model–measurement differences exhibit multi-millennial trends (differences up to 87% in case of normalized to the Holocene records) which call for closer investigation. Focusing on the (12–37) b2k (before the year AD 2000) period, mean model–measurement differences of 30% cannot be attributed to production changes. However, unconsidered climate-induced changes could likely explain the model–measurement mismatch. In fact, the 10Be ice concentration is very sensitive to snow accumulation changes. Here the reconstructed Greenland Summit (GRIP) snow accumulation rate record would require ... |
format |
Article in Journal/Newspaper |
author |
Elsasser, Christoph Wagenbach, Dietmar Levin, I. Stanzick, A. Christl, M Wallner, Anton Kipfstuhl, Sepp Seierstad, I.K. Wershofen, H Dibb, J. |
author_facet |
Elsasser, Christoph Wagenbach, Dietmar Levin, I. Stanzick, A. Christl, M Wallner, Anton Kipfstuhl, Sepp Seierstad, I.K. Wershofen, H Dibb, J. |
author_sort |
Elsasser, Christoph |
title |
Simulating ice core Be-10 on the glacial-interglacial timescale |
title_short |
Simulating ice core Be-10 on the glacial-interglacial timescale |
title_full |
Simulating ice core Be-10 on the glacial-interglacial timescale |
title_fullStr |
Simulating ice core Be-10 on the glacial-interglacial timescale |
title_full_unstemmed |
Simulating ice core Be-10 on the glacial-interglacial timescale |
title_sort |
simulating ice core be-10 on the glacial-interglacial timescale |
publisher |
Copernicus GmbH |
url |
http://hdl.handle.net/1885/153354 https://doi.org/10.5194/cp-11-115-2015 https://openresearch-repository.anu.edu.au/bitstream/1885/153354/5/01_Elsasser_Simulating_ice_core_Be-10_on_2015.pdf.jpg |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland GRIP ice core |
genre_facet |
Greenland GRIP ice core |
op_source |
Climate of the Past |
op_relation |
1814-9324 http://hdl.handle.net/1885/153354 doi:10.5194/cp-11-115-2015 https://openresearch-repository.anu.edu.au/bitstream/1885/153354/5/01_Elsasser_Simulating_ice_core_Be-10_on_2015.pdf.jpg |
op_doi |
https://doi.org/10.5194/cp-11-115-2015 |
container_title |
Climate of the Past |
container_volume |
11 |
container_issue |
2 |
container_start_page |
115 |
op_container_end_page |
133 |
_version_ |
1788061689038503936 |