Atmospheric methane control mechanisms during the early Holocene
Understanding processes controlling the atmospheric methane (CH 4 ) mixing ratio is crucial to predict and mitigate future climate changes in this gas. Despite recent detailed studies of the last ∼ 1000 to 2000 years, the mechanisms that control atmospheric CH 4 still remain unclear, partly because...
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ftcopernicus:oai:publications.copernicus.org:cp53556 2023-05-15T13:54:27+02:00 Atmospheric methane control mechanisms during the early Holocene Yang, Ji-Woong Ahn, Jinho Brook, Edward J. Ryu, Yeongjun 2018-09-27 application/pdf https://doi.org/10.5194/cp-13-1227-2017 https://cp.copernicus.org/articles/13/1227/2017/ eng eng doi:10.5194/cp-13-1227-2017 https://cp.copernicus.org/articles/13/1227/2017/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cp-13-1227-2017 2020-07-20T16:23:36Z Understanding processes controlling the atmospheric methane (CH 4 ) mixing ratio is crucial to predict and mitigate future climate changes in this gas. Despite recent detailed studies of the last ∼ 1000 to 2000 years, the mechanisms that control atmospheric CH 4 still remain unclear, partly because the late Holocene CH 4 budget may be comprised of both natural and anthropogenic emissions. In contrast, the early Holocene was a period when human influence was substantially smaller, allowing us to elucidate more clearly the natural controls under interglacial conditions more clearly. Here we present new high-resolution CH 4 records from Siple Dome, Antarctica, covering from 11.6 to 7.7 thousands of years before 1950 AD (ka). We observe four local CH 4 minima on a roughly 1000-year spacing, which correspond to cool periods in Greenland. We hypothesize that the cooling in Greenland forced the Intertropical Convergence Zone (ITCZ) to migrate southward, reducing rainfall in northern tropical wetlands. The inter-polar difference (IPD) of CH 4 shows a gradual increase from the onset of the Holocene to ∼ 9.5 ka, which implies growth of boreal source strength following the climate warming in the northern extratropics during that period. Text Antarc* Antarctica Greenland Copernicus Publications: E-Journals Greenland Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Dome ENVELOPE(-148.833,-148.833,-81.667,-81.667) Climate of the Past 13 9 1227 1242 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
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Understanding processes controlling the atmospheric methane (CH 4 ) mixing ratio is crucial to predict and mitigate future climate changes in this gas. Despite recent detailed studies of the last ∼ 1000 to 2000 years, the mechanisms that control atmospheric CH 4 still remain unclear, partly because the late Holocene CH 4 budget may be comprised of both natural and anthropogenic emissions. In contrast, the early Holocene was a period when human influence was substantially smaller, allowing us to elucidate more clearly the natural controls under interglacial conditions more clearly. Here we present new high-resolution CH 4 records from Siple Dome, Antarctica, covering from 11.6 to 7.7 thousands of years before 1950 AD (ka). We observe four local CH 4 minima on a roughly 1000-year spacing, which correspond to cool periods in Greenland. We hypothesize that the cooling in Greenland forced the Intertropical Convergence Zone (ITCZ) to migrate southward, reducing rainfall in northern tropical wetlands. The inter-polar difference (IPD) of CH 4 shows a gradual increase from the onset of the Holocene to ∼ 9.5 ka, which implies growth of boreal source strength following the climate warming in the northern extratropics during that period. |
format |
Text |
author |
Yang, Ji-Woong Ahn, Jinho Brook, Edward J. Ryu, Yeongjun |
spellingShingle |
Yang, Ji-Woong Ahn, Jinho Brook, Edward J. Ryu, Yeongjun Atmospheric methane control mechanisms during the early Holocene |
author_facet |
Yang, Ji-Woong Ahn, Jinho Brook, Edward J. Ryu, Yeongjun |
author_sort |
Yang, Ji-Woong |
title |
Atmospheric methane control mechanisms during the early Holocene |
title_short |
Atmospheric methane control mechanisms during the early Holocene |
title_full |
Atmospheric methane control mechanisms during the early Holocene |
title_fullStr |
Atmospheric methane control mechanisms during the early Holocene |
title_full_unstemmed |
Atmospheric methane control mechanisms during the early Holocene |
title_sort |
atmospheric methane control mechanisms during the early holocene |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-13-1227-2017 https://cp.copernicus.org/articles/13/1227/2017/ |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-148.833,-148.833,-81.667,-81.667) |
geographic |
Greenland Siple Siple Dome |
geographic_facet |
Greenland Siple Siple Dome |
genre |
Antarc* Antarctica Greenland |
genre_facet |
Antarc* Antarctica Greenland |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-13-1227-2017 https://cp.copernicus.org/articles/13/1227/2017/ |
op_doi |
https://doi.org/10.5194/cp-13-1227-2017 |
container_title |
Climate of the Past |
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13 |
container_issue |
9 |
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1227 |
op_container_end_page |
1242 |
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1766260319023267840 |