Analytical constraints on layered gas trapping and smoothing of atmospheric variability in ice under low-accumulation conditions
International audience We investigate for the first time the loss and alteration of past atmospheric information from air trapping mechanisms under low-accumulation conditions through continuous CH4 (and CO) measurements. Methane concentration changes were measured over the Dansgaard–Oeschger event...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2017
|
Subjects: | |
Online Access: | https://hal.science/hal-03226094 https://hal.science/hal-03226094/document https://hal.science/hal-03226094/file/cp-13-1815-2017.pdf https://doi.org/10.5194/cp-13-1815-2017 |
id |
ftuniparissaclay:oai:HAL:hal-03226094v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Fourteau, Kévin Faïn, Xavier Martinerie, Patricia Landais, Amaëlle Ekaykin, Alexey Lipenkov, Vladimir Ya. Chappellaz, Jérôme Analytical constraints on layered gas trapping and smoothing of atmospheric variability in ice under low-accumulation conditions |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience We investigate for the first time the loss and alteration of past atmospheric information from air trapping mechanisms under low-accumulation conditions through continuous CH4 (and CO) measurements. Methane concentration changes were measured over the Dansgaard–Oeschger event 17 (DO-17, ∼ 60 000 yr BP) in the Antarctic Vostok 4G-2 ice core. Measurements were performed using continuous-flow analysis combined with laser spectroscopy. The results highlight many anomalous layers at the centimeter scale that are unevenly distributed along the ice core. The anomalous methane mixing ratios differ from those in the immediate surrounding layers by up to 50 ppbv. This phenomenon can be theoretically reproduced by a simple layered trapping model, creating very localized gas age scale inversions. We propose a method for cleaning the record of anomalous values that aims at minimizing the bias in the overall signal. Once the layered-trapping-induced anomalies are removed from the record, DO-17 appears to be smoother than its equivalent record from the high-accumulation WAIS Divide ice core. This is expected due to the slower sinking and densification speeds of firn layers at lower accumulation. However, the degree of smoothing appears surprisingly similar between modern and DO-17 conditions at Vostok. This suggests that glacial records of trace gases from low-accumulation sites in the East Antarctic plateau can provide a better time resolution of past atmospheric composition changes than previously expected. We also developed a numerical method to extract the gas age distributions in ice layers after the removal of the anomalous layers based on comparison with a weakly smoothed record. It is particularly adapted for the conditions of the East Antarctic plateau, as it helps to characterize smoothing for a large range of very low-temperature and low-accumulation conditions. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Arctic and Antarctic Research Institute (AARI) Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet) |
format |
Article in Journal/Newspaper |
author |
Fourteau, Kévin Faïn, Xavier Martinerie, Patricia Landais, Amaëlle Ekaykin, Alexey Lipenkov, Vladimir Ya. Chappellaz, Jérôme |
author_facet |
Fourteau, Kévin Faïn, Xavier Martinerie, Patricia Landais, Amaëlle Ekaykin, Alexey Lipenkov, Vladimir Ya. Chappellaz, Jérôme |
author_sort |
Fourteau, Kévin |
title |
Analytical constraints on layered gas trapping and smoothing of atmospheric variability in ice under low-accumulation conditions |
title_short |
Analytical constraints on layered gas trapping and smoothing of atmospheric variability in ice under low-accumulation conditions |
title_full |
Analytical constraints on layered gas trapping and smoothing of atmospheric variability in ice under low-accumulation conditions |
title_fullStr |
Analytical constraints on layered gas trapping and smoothing of atmospheric variability in ice under low-accumulation conditions |
title_full_unstemmed |
Analytical constraints on layered gas trapping and smoothing of atmospheric variability in ice under low-accumulation conditions |
title_sort |
analytical constraints on layered gas trapping and smoothing of atmospheric variability in ice under low-accumulation conditions |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-03226094 https://hal.science/hal-03226094/document https://hal.science/hal-03226094/file/cp-13-1815-2017.pdf https://doi.org/10.5194/cp-13-1815-2017 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03226094 Climate of the Past, 2017, 13 (12), pp.1815-1830. ⟨10.5194/cp-13-1815-2017⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-13-1815-2017 hal-03226094 https://hal.science/hal-03226094 https://hal.science/hal-03226094/document https://hal.science/hal-03226094/file/cp-13-1815-2017.pdf doi:10.5194/cp-13-1815-2017 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-13-1815-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
12 |
container_start_page |
1815 |
op_container_end_page |
1830 |
_version_ |
1802008932696195072 |
spelling |
ftuniparissaclay:oai:HAL:hal-03226094v1 2024-06-16T07:34:25+00:00 Analytical constraints on layered gas trapping and smoothing of atmospheric variability in ice under low-accumulation conditions Fourteau, Kévin Faïn, Xavier Martinerie, Patricia Landais, Amaëlle Ekaykin, Alexey Lipenkov, Vladimir Ya. Chappellaz, Jérôme Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Arctic and Antarctic Research Institute (AARI) Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet) 2017 https://hal.science/hal-03226094 https://hal.science/hal-03226094/document https://hal.science/hal-03226094/file/cp-13-1815-2017.pdf https://doi.org/10.5194/cp-13-1815-2017 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-13-1815-2017 hal-03226094 https://hal.science/hal-03226094 https://hal.science/hal-03226094/document https://hal.science/hal-03226094/file/cp-13-1815-2017.pdf doi:10.5194/cp-13-1815-2017 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03226094 Climate of the Past, 2017, 13 (12), pp.1815-1830. ⟨10.5194/cp-13-1815-2017⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2017 ftuniparissaclay https://doi.org/10.5194/cp-13-1815-2017 2024-05-17T00:05:47Z International audience We investigate for the first time the loss and alteration of past atmospheric information from air trapping mechanisms under low-accumulation conditions through continuous CH4 (and CO) measurements. Methane concentration changes were measured over the Dansgaard–Oeschger event 17 (DO-17, ∼ 60 000 yr BP) in the Antarctic Vostok 4G-2 ice core. Measurements were performed using continuous-flow analysis combined with laser spectroscopy. The results highlight many anomalous layers at the centimeter scale that are unevenly distributed along the ice core. The anomalous methane mixing ratios differ from those in the immediate surrounding layers by up to 50 ppbv. This phenomenon can be theoretically reproduced by a simple layered trapping model, creating very localized gas age scale inversions. We propose a method for cleaning the record of anomalous values that aims at minimizing the bias in the overall signal. Once the layered-trapping-induced anomalies are removed from the record, DO-17 appears to be smoother than its equivalent record from the high-accumulation WAIS Divide ice core. This is expected due to the slower sinking and densification speeds of firn layers at lower accumulation. However, the degree of smoothing appears surprisingly similar between modern and DO-17 conditions at Vostok. This suggests that glacial records of trace gases from low-accumulation sites in the East Antarctic plateau can provide a better time resolution of past atmospheric composition changes than previously expected. We also developed a numerical method to extract the gas age distributions in ice layers after the removal of the anomalous layers based on comparison with a weakly smoothed record. It is particularly adapted for the conditions of the East Antarctic plateau, as it helps to characterize smoothing for a large range of very low-temperature and low-accumulation conditions. Article in Journal/Newspaper Antarc* Antarctic ice core Archives ouvertes de Paris-Saclay Antarctic The Antarctic Climate of the Past 13 12 1815 1830 |