Dual stable isotopic methane (δ¹³CH4 and dD(CH4)) records from four Antarctic ice cores
Atmospheric methane (CH4) records reconstructed from polar ice cores represent a integrated view on processes predominantly taking place in the terrestrial biogeosphere. Here we present dual stable isotopic methane records (d13CH4 and dD(CH4)) from four Antarctic ice cores, which provide improved co...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.873918 2023-05-15T13:44:47+02:00 Dual stable isotopic methane (δ¹³CH4 and dD(CH4)) records from four Antarctic ice cores Bock, Michael Schmitt, Jochen Beck, Jonas Seth, Barbara Chappellaz, Jérôme A Fischer, Hubertus MEDIAN LATITUDE: -75.290050 * MEDIAN LONGITUDE: 102.534478 * SOUTH-BOUND LATITUDE: -78.464420 * WEST-BOUND LONGITUDE: 0.068400 * NORTH-BOUND LATITUDE: -72.783330 * EAST-BOUND LONGITUDE: 159.066670 * DATE/TIME START: 1980-01-01T00:00:00 * DATE/TIME END: 2008-12-31T00:00:00 2017-03-24 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.873918 https://doi.org/10.1594/PANGAEA.873918 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.873918 https://doi.org/10.1594/PANGAEA.873918 CC-BY-ND-3.0: Creative Commons Attribution-NoDerivs 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY-ND Supplement to: Bock, Michael; Schmitt, Jochen; Beck, Jonas; Seth, Barbara; Chappellaz, Jérôme A; Fischer, Hubertus (2017): Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH4 ice core records. Proceedings of the National Academy of Sciences, 201613883, https://doi.org/10.1073/pnas.1613883114 EPICA European Project for Ice Coring in Antarctica Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.873918 https://doi.org/10.1073/pnas.1613883114 2023-01-20T07:33:55Z Atmospheric methane (CH4) records reconstructed from polar ice cores represent a integrated view on processes predominantly taking place in the terrestrial biogeosphere. Here we present dual stable isotopic methane records (d13CH4 and dD(CH4)) from four Antarctic ice cores, which provide improved constraints on past changes in natural methane sources. Our isotope data show that tropical wetlands and seasonally inundated floodplains are most likely the controlling sources of atmospheric methane variations for the current and two older interglacials and their preceding glacial maxima. The changes in these sources are steered by variations in temperature, precipitation and the water table, as modulated by insolation, (local) sea level and monsoon intensity. Based on our new dD(CH4) constraint, it appears that geologic emissions of methane may play a steady but only minor role in atmospheric CH4 changes, and that the glacial budget is not dominated by these sources. Superimposed on the glacial/interglacial variations is a marked difference in both isotope records, with systematically higher values during the last 25,000 years compared to older time periods. This shift cannot be explained by climatic changes. Rather, our isotopic methane budget points to a marked increase in fire activity, possibly due to biome changes and accumulation of fuel related to the late Pleistocene megafauna extinction, which took place in the course of the last glacial. Dataset Antarc* Antarctic Antarctica EPICA PANGAEA - Data Publisher for Earth & Environmental Science Antarctic ENVELOPE(0.068400,159.066670,-72.783330,-78.464420) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
EPICA European Project for Ice Coring in Antarctica |
spellingShingle |
EPICA European Project for Ice Coring in Antarctica Bock, Michael Schmitt, Jochen Beck, Jonas Seth, Barbara Chappellaz, Jérôme A Fischer, Hubertus Dual stable isotopic methane (δ¹³CH4 and dD(CH4)) records from four Antarctic ice cores |
topic_facet |
EPICA European Project for Ice Coring in Antarctica |
description |
Atmospheric methane (CH4) records reconstructed from polar ice cores represent a integrated view on processes predominantly taking place in the terrestrial biogeosphere. Here we present dual stable isotopic methane records (d13CH4 and dD(CH4)) from four Antarctic ice cores, which provide improved constraints on past changes in natural methane sources. Our isotope data show that tropical wetlands and seasonally inundated floodplains are most likely the controlling sources of atmospheric methane variations for the current and two older interglacials and their preceding glacial maxima. The changes in these sources are steered by variations in temperature, precipitation and the water table, as modulated by insolation, (local) sea level and monsoon intensity. Based on our new dD(CH4) constraint, it appears that geologic emissions of methane may play a steady but only minor role in atmospheric CH4 changes, and that the glacial budget is not dominated by these sources. Superimposed on the glacial/interglacial variations is a marked difference in both isotope records, with systematically higher values during the last 25,000 years compared to older time periods. This shift cannot be explained by climatic changes. Rather, our isotopic methane budget points to a marked increase in fire activity, possibly due to biome changes and accumulation of fuel related to the late Pleistocene megafauna extinction, which took place in the course of the last glacial. |
format |
Dataset |
author |
Bock, Michael Schmitt, Jochen Beck, Jonas Seth, Barbara Chappellaz, Jérôme A Fischer, Hubertus |
author_facet |
Bock, Michael Schmitt, Jochen Beck, Jonas Seth, Barbara Chappellaz, Jérôme A Fischer, Hubertus |
author_sort |
Bock, Michael |
title |
Dual stable isotopic methane (δ¹³CH4 and dD(CH4)) records from four Antarctic ice cores |
title_short |
Dual stable isotopic methane (δ¹³CH4 and dD(CH4)) records from four Antarctic ice cores |
title_full |
Dual stable isotopic methane (δ¹³CH4 and dD(CH4)) records from four Antarctic ice cores |
title_fullStr |
Dual stable isotopic methane (δ¹³CH4 and dD(CH4)) records from four Antarctic ice cores |
title_full_unstemmed |
Dual stable isotopic methane (δ¹³CH4 and dD(CH4)) records from four Antarctic ice cores |
title_sort |
dual stable isotopic methane (δ¹³ch4 and dd(ch4)) records from four antarctic ice cores |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.873918 https://doi.org/10.1594/PANGAEA.873918 |
op_coverage |
MEDIAN LATITUDE: -75.290050 * MEDIAN LONGITUDE: 102.534478 * SOUTH-BOUND LATITUDE: -78.464420 * WEST-BOUND LONGITUDE: 0.068400 * NORTH-BOUND LATITUDE: -72.783330 * EAST-BOUND LONGITUDE: 159.066670 * DATE/TIME START: 1980-01-01T00:00:00 * DATE/TIME END: 2008-12-31T00:00:00 |
long_lat |
ENVELOPE(0.068400,159.066670,-72.783330,-78.464420) |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica EPICA |
genre_facet |
Antarc* Antarctic Antarctica EPICA |
op_source |
Supplement to: Bock, Michael; Schmitt, Jochen; Beck, Jonas; Seth, Barbara; Chappellaz, Jérôme A; Fischer, Hubertus (2017): Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH4 ice core records. Proceedings of the National Academy of Sciences, 201613883, https://doi.org/10.1073/pnas.1613883114 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.873918 https://doi.org/10.1594/PANGAEA.873918 |
op_rights |
CC-BY-ND-3.0: Creative Commons Attribution-NoDerivs 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY-ND |
op_doi |
https://doi.org/10.1594/PANGAEA.873918 https://doi.org/10.1073/pnas.1613883114 |
_version_ |
1766206540105121792 |