High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core
The Greenland NEEM (North Greenland Eemian Ice Drilling) operation in 2010 provided the first opportunity to combine trace-gas measurements by laser spectroscopic instruments and continuous-flow analysis along a freshly drilled ice core in a field-based setting. We present the resulting atmospheric...
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Online Access: | https://doi.org/10.5194/cp-9-2579-2013 https://cp.copernicus.org/articles/9/2579/2013/ |
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fttriple:oai:gotriple.eu:sMyJ7QQNoX_7SvQozYs4h 2023-05-15T16:28:27+02:00 High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core Chappellaz, J. Stowasser, C. Blunier, T. Baslev-Clausen, D. Brook, E. J. Dallmayr, R. Faïn, X. Lee, J. E. Mitchell, L. E. Pascual, O. Romanini, D. Rosen, J. Schüpbach, S. 2018-09-27 https://doi.org/10.5194/cp-9-2579-2013 https://cp.copernicus.org/articles/9/2579/2013/ en eng Copernicus Publications doi:10.5194/cp-9-2579-2013 10670/1.csy9a1 1814-9324 1814-9332 https://cp.copernicus.org/articles/9/2579/2013/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Other https://vocabularies.coar-repositories.org/resource_types/c_1843/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-9-2579-2013 2023-01-22T17:52:23Z The Greenland NEEM (North Greenland Eemian Ice Drilling) operation in 2010 provided the first opportunity to combine trace-gas measurements by laser spectroscopic instruments and continuous-flow analysis along a freshly drilled ice core in a field-based setting. We present the resulting atmospheric methane (CH4) record covering the time period from 107.7 to 9.5 ka b2k (thousand years before 2000 AD). Companion discrete CH4 measurements are required to transfer the laser spectroscopic data from a relative to an absolute scale. However, even on a relative scale, the high-resolution CH4 data set significantly improves our knowledge of past atmospheric methane concentration changes. New significant sub-millennial-scale features appear during interstadials and stadials, generally associated with similar changes in water isotopic ratios of the ice, a proxy for local temperature. In addition to the midpoint of Dansgaard–Oeschger (D/O) CH4 transitions usually used for cross-dating, sharp definition of the start and end of these events brings precise depth markers (with ±20 cm uncertainty) for further cross-dating with other palaeo- or ice core records, e.g. speleothems. The method also provides an estimate of CH4 rates of change. The onsets of D/O events in the methane signal show a more rapid rate of change than their endings. The rate of CH4 increase associated with the onsets of D/O events progressively declines from 1.7 to 0.6 ppbv yr−1 in the course of marine isotope stage 3. The largest observed rate of increase takes place at the onset of D/O event #21 and reaches 2.5 ppbv yr−1. Article in Journal/Newspaper Greenland ice core North Greenland Unknown Greenland Climate of the Past 9 6 2579 2593 |
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language |
English |
topic |
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spellingShingle |
geo envir Chappellaz, J. Stowasser, C. Blunier, T. Baslev-Clausen, D. Brook, E. J. Dallmayr, R. Faïn, X. Lee, J. E. Mitchell, L. E. Pascual, O. Romanini, D. Rosen, J. Schüpbach, S. High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core |
topic_facet |
geo envir |
description |
The Greenland NEEM (North Greenland Eemian Ice Drilling) operation in 2010 provided the first opportunity to combine trace-gas measurements by laser spectroscopic instruments and continuous-flow analysis along a freshly drilled ice core in a field-based setting. We present the resulting atmospheric methane (CH4) record covering the time period from 107.7 to 9.5 ka b2k (thousand years before 2000 AD). Companion discrete CH4 measurements are required to transfer the laser spectroscopic data from a relative to an absolute scale. However, even on a relative scale, the high-resolution CH4 data set significantly improves our knowledge of past atmospheric methane concentration changes. New significant sub-millennial-scale features appear during interstadials and stadials, generally associated with similar changes in water isotopic ratios of the ice, a proxy for local temperature. In addition to the midpoint of Dansgaard–Oeschger (D/O) CH4 transitions usually used for cross-dating, sharp definition of the start and end of these events brings precise depth markers (with ±20 cm uncertainty) for further cross-dating with other palaeo- or ice core records, e.g. speleothems. The method also provides an estimate of CH4 rates of change. The onsets of D/O events in the methane signal show a more rapid rate of change than their endings. The rate of CH4 increase associated with the onsets of D/O events progressively declines from 1.7 to 0.6 ppbv yr−1 in the course of marine isotope stage 3. The largest observed rate of increase takes place at the onset of D/O event #21 and reaches 2.5 ppbv yr−1. |
format |
Article in Journal/Newspaper |
author |
Chappellaz, J. Stowasser, C. Blunier, T. Baslev-Clausen, D. Brook, E. J. Dallmayr, R. Faïn, X. Lee, J. E. Mitchell, L. E. Pascual, O. Romanini, D. Rosen, J. Schüpbach, S. |
author_facet |
Chappellaz, J. Stowasser, C. Blunier, T. Baslev-Clausen, D. Brook, E. J. Dallmayr, R. Faïn, X. Lee, J. E. Mitchell, L. E. Pascual, O. Romanini, D. Rosen, J. Schüpbach, S. |
author_sort |
Chappellaz, J. |
title |
High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core |
title_short |
High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core |
title_full |
High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core |
title_fullStr |
High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core |
title_full_unstemmed |
High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core |
title_sort |
high-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the neem ice core |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-9-2579-2013 https://cp.copernicus.org/articles/9/2579/2013/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core North Greenland |
genre_facet |
Greenland ice core North Greenland |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-9-2579-2013 10670/1.csy9a1 1814-9324 1814-9332 https://cp.copernicus.org/articles/9/2579/2013/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-9-2579-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
6 |
container_start_page |
2579 |
op_container_end_page |
2593 |
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1766018097540497408 |