A Positive Cooling Feedback for the Neoproterozoic Snowball Earth Initiation Due To Weakening of Ocean Ventilation
Abstract Ocean ventilation is an important regulator for atmospheric CO2 level (pCO2) by affecting the relative proportion of carbon stored in the atmosphere and deep ocean. Expansion of sea ice during glacial periods slows down ocean ventilation and its effect is expected to be the largest during t...
Published in: | Geophysical Research Letters |
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Online Access: | https://doi.org/10.1029/2022GL102020 https://doaj.org/article/19ee27fe693c4e2daa254fe40b5f4010 |
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ftdoajarticles:oai:doaj.org/article:19ee27fe693c4e2daa254fe40b5f4010 2024-09-15T18:34:45+00:00 A Positive Cooling Feedback for the Neoproterozoic Snowball Earth Initiation Due To Weakening of Ocean Ventilation Peng Liu Yonggang Liu Sifan Gu Paul Hoffman Sanzhong Li 2023-02-01T00:00:00Z https://doi.org/10.1029/2022GL102020 https://doaj.org/article/19ee27fe693c4e2daa254fe40b5f4010 EN eng Wiley https://doi.org/10.1029/2022GL102020 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2022GL102020 https://doaj.org/article/19ee27fe693c4e2daa254fe40b5f4010 Geophysical Research Letters, Vol 50, Iss 4, Pp n/a-n/a (2023) ocean ventilation snowball earth Neoproterozoic carbon storage meridional overturning circulation Geophysics. Cosmic physics QC801-809 article 2023 ftdoajarticles https://doi.org/10.1029/2022GL102020 2024-08-05T17:49:23Z Abstract Ocean ventilation is an important regulator for atmospheric CO2 level (pCO2) by affecting the relative proportion of carbon stored in the atmosphere and deep ocean. Expansion of sea ice during glacial periods slows down ocean ventilation and its effect is expected to be the largest during the Neoproterozoic pre‐snowball stage. Here, our Community Earth System Model version 1.2.2 simulations demonstrate that averaged deep ocean ventilation age almost triples when the climate cools from a warm state with negligible sea ice to one in which the global sea‐ice coverage reaches ∼50% when pCO2 is lowered to 280 ppmv. Further cooling by reducing pCO2 from 280 to 70 ppmv increases the ventilation age from 1900 to 2300 years. This latter small increase in deep‐ocean ventilation age can reduce pCO2 by 48 ppmv, assuming Neoproterozoic organic production was comparable to present level. Therefore, the weakened ocean ventilation constitutes a significant positive feedback to the Late Neoproterozoic climate cooling. Article in Journal/Newspaper Sea ice Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 50 4 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ocean ventilation snowball earth Neoproterozoic carbon storage meridional overturning circulation Geophysics. Cosmic physics QC801-809 |
spellingShingle |
ocean ventilation snowball earth Neoproterozoic carbon storage meridional overturning circulation Geophysics. Cosmic physics QC801-809 Peng Liu Yonggang Liu Sifan Gu Paul Hoffman Sanzhong Li A Positive Cooling Feedback for the Neoproterozoic Snowball Earth Initiation Due To Weakening of Ocean Ventilation |
topic_facet |
ocean ventilation snowball earth Neoproterozoic carbon storage meridional overturning circulation Geophysics. Cosmic physics QC801-809 |
description |
Abstract Ocean ventilation is an important regulator for atmospheric CO2 level (pCO2) by affecting the relative proportion of carbon stored in the atmosphere and deep ocean. Expansion of sea ice during glacial periods slows down ocean ventilation and its effect is expected to be the largest during the Neoproterozoic pre‐snowball stage. Here, our Community Earth System Model version 1.2.2 simulations demonstrate that averaged deep ocean ventilation age almost triples when the climate cools from a warm state with negligible sea ice to one in which the global sea‐ice coverage reaches ∼50% when pCO2 is lowered to 280 ppmv. Further cooling by reducing pCO2 from 280 to 70 ppmv increases the ventilation age from 1900 to 2300 years. This latter small increase in deep‐ocean ventilation age can reduce pCO2 by 48 ppmv, assuming Neoproterozoic organic production was comparable to present level. Therefore, the weakened ocean ventilation constitutes a significant positive feedback to the Late Neoproterozoic climate cooling. |
format |
Article in Journal/Newspaper |
author |
Peng Liu Yonggang Liu Sifan Gu Paul Hoffman Sanzhong Li |
author_facet |
Peng Liu Yonggang Liu Sifan Gu Paul Hoffman Sanzhong Li |
author_sort |
Peng Liu |
title |
A Positive Cooling Feedback for the Neoproterozoic Snowball Earth Initiation Due To Weakening of Ocean Ventilation |
title_short |
A Positive Cooling Feedback for the Neoproterozoic Snowball Earth Initiation Due To Weakening of Ocean Ventilation |
title_full |
A Positive Cooling Feedback for the Neoproterozoic Snowball Earth Initiation Due To Weakening of Ocean Ventilation |
title_fullStr |
A Positive Cooling Feedback for the Neoproterozoic Snowball Earth Initiation Due To Weakening of Ocean Ventilation |
title_full_unstemmed |
A Positive Cooling Feedback for the Neoproterozoic Snowball Earth Initiation Due To Weakening of Ocean Ventilation |
title_sort |
positive cooling feedback for the neoproterozoic snowball earth initiation due to weakening of ocean ventilation |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2022GL102020 https://doaj.org/article/19ee27fe693c4e2daa254fe40b5f4010 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Geophysical Research Letters, Vol 50, Iss 4, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2022GL102020 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2022GL102020 https://doaj.org/article/19ee27fe693c4e2daa254fe40b5f4010 |
op_doi |
https://doi.org/10.1029/2022GL102020 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
4 |
_version_ |
1810476713193242624 |