NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core
During the last glacial cycle, Greenland temperature showed many rapid temperature variations, the so-called Dansgaard–Oeschger (DO) events. The past atmospheric methane concentration closely followed these temperature variations, which implies that the warmings recorded in Greenland were probably h...
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Online Access: | https://doi.org/10.5194/cp-10-903-2014 https://cp.copernicus.org/articles/10/903/2014/ |
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fttriple:oai:gotriple.eu:13Dh4xwRpk_SheGelEoGG 2023-05-15T16:27:05+02:00 NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core Baumgartner, M. Kindler, P. Eicher, O. Floch, G. Schilt, A. Schwander, J. Spahni, R. Capron, E. Chappellaz, J. Leuenberger, M. Fischer, H. Stocker, T. F. 2018-09-27 https://doi.org/10.5194/cp-10-903-2014 https://cp.copernicus.org/articles/10/903/2014/ en eng Copernicus Publications doi:10.5194/cp-10-903-2014 10670/1.c7dhmi 1814-9324 1814-9332 https://cp.copernicus.org/articles/10/903/2014/ undefined Geographica Helvetica - geography eISSN: 1814-9332 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-10-903-2014 2023-01-22T17:39:34Z During the last glacial cycle, Greenland temperature showed many rapid temperature variations, the so-called Dansgaard–Oeschger (DO) events. The past atmospheric methane concentration closely followed these temperature variations, which implies that the warmings recorded in Greenland were probably hemispheric in extent. Here we substantially extend and complete the North Greenland Ice Core Project (NGRIP) methane record from the Preboreal Holocene (PB) back to the end of the last interglacial period with a mean time resolution of 54 yr. We relate the amplitudes of the methane increases associated with DO events to the amplitudes of the local Greenland NGRIP temperature increases derived from stable nitrogen isotope (δ15N) measurements, which have been performed along the same ice core (Kindler et al., 2014). We find the ratio to oscillate between 5 parts per billion (ppb) per °C and 18 ppb °C−1 with the approximate frequency of the precessional cycle. A remarkably high ratio of 25.5 ppb °C−1 is reached during the transition from the Younger Dryas (YD) to the PB. Analysis of the timing of the fast methane and temperature increases reveals significant lags of the methane increases relative to NGRIP temperature for DO events 5, 9, 10, 11, 13, 15, 19, and 20. These events generally have small methane increase rates and we hypothesize that the lag is caused by pronounced northward displacement of the source regions from stadial to interstadial. We further show that the relative interpolar concentration difference (rIPD) of methane is about 4.5% for the stadials between DO events 18 and 20, which is in the same order as in the stadials before and after DO event 2 around the Last Glacial Maximum. The rIPD of methane remains relatively stable throughout the full last glacial, with a tendency for elevated values during interstadial compared to stadial periods. Article in Journal/Newspaper Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project Unknown Greenland Climate of the Past 10 2 903 920 |
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envir geo Baumgartner, M. Kindler, P. Eicher, O. Floch, G. Schilt, A. Schwander, J. Spahni, R. Capron, E. Chappellaz, J. Leuenberger, M. Fischer, H. Stocker, T. F. NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core |
topic_facet |
envir geo |
description |
During the last glacial cycle, Greenland temperature showed many rapid temperature variations, the so-called Dansgaard–Oeschger (DO) events. The past atmospheric methane concentration closely followed these temperature variations, which implies that the warmings recorded in Greenland were probably hemispheric in extent. Here we substantially extend and complete the North Greenland Ice Core Project (NGRIP) methane record from the Preboreal Holocene (PB) back to the end of the last interglacial period with a mean time resolution of 54 yr. We relate the amplitudes of the methane increases associated with DO events to the amplitudes of the local Greenland NGRIP temperature increases derived from stable nitrogen isotope (δ15N) measurements, which have been performed along the same ice core (Kindler et al., 2014). We find the ratio to oscillate between 5 parts per billion (ppb) per °C and 18 ppb °C−1 with the approximate frequency of the precessional cycle. A remarkably high ratio of 25.5 ppb °C−1 is reached during the transition from the Younger Dryas (YD) to the PB. Analysis of the timing of the fast methane and temperature increases reveals significant lags of the methane increases relative to NGRIP temperature for DO events 5, 9, 10, 11, 13, 15, 19, and 20. These events generally have small methane increase rates and we hypothesize that the lag is caused by pronounced northward displacement of the source regions from stadial to interstadial. We further show that the relative interpolar concentration difference (rIPD) of methane is about 4.5% for the stadials between DO events 18 and 20, which is in the same order as in the stadials before and after DO event 2 around the Last Glacial Maximum. The rIPD of methane remains relatively stable throughout the full last glacial, with a tendency for elevated values during interstadial compared to stadial periods. |
format |
Article in Journal/Newspaper |
author |
Baumgartner, M. Kindler, P. Eicher, O. Floch, G. Schilt, A. Schwander, J. Spahni, R. Capron, E. Chappellaz, J. Leuenberger, M. Fischer, H. Stocker, T. F. |
author_facet |
Baumgartner, M. Kindler, P. Eicher, O. Floch, G. Schilt, A. Schwander, J. Spahni, R. Capron, E. Chappellaz, J. Leuenberger, M. Fischer, H. Stocker, T. F. |
author_sort |
Baumgartner, M. |
title |
NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core |
title_short |
NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core |
title_full |
NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core |
title_fullStr |
NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core |
title_full_unstemmed |
NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core |
title_sort |
ngrip ch4 concentration from 120 to 10 kyr before present and its relation to a δ15n temperature reconstruction from the same ice core |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-10-903-2014 https://cp.copernicus.org/articles/10/903/2014/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project |
genre_facet |
Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-10-903-2014 10670/1.c7dhmi 1814-9324 1814-9332 https://cp.copernicus.org/articles/10/903/2014/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-10-903-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
2 |
container_start_page |
903 |
op_container_end_page |
920 |
_version_ |
1766016142013366272 |