Carbon cycle implications of terrestrial weathering changes since the last glacial maximum
We examine the importance of the rock weathering feedback mechanism during the last deglacial period (∼16 000–4000 BCE) using an Earth system model of intermediate complexity (the University of Victoria Earth System Climate Model (UVic ESCM)) with four box-model parameterizations of terrestrial weat...
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ftdoajarticles:oai:doaj.org/article:f530b4c9aa6a420e86a113d8e73094fe 2023-05-15T16:39:13+02:00 Carbon cycle implications of terrestrial weathering changes since the last glacial maximum M.-O. Brault L.A. Mysak H.D. Matthews 2017-03-01T00:00:00Z https://doi.org/10.1139/facets-2016-0040 https://doaj.org/article/f530b4c9aa6a420e86a113d8e73094fe EN eng Canadian Science Publishing http://www.facetsjournal.com/doi/10.1139/facets-2016-0040 https://doaj.org/toc/2371-1671 doi:10.1139/facets-2016-0040 2371-1671 https://doaj.org/article/f530b4c9aa6a420e86a113d8e73094fe FACETS, Vol 2, Pp 267-285 (2017) deglacial climate change paleoclimatology climate modeling biogeochemistry weathering Education L Science Q article 2017 ftdoajarticles https://doi.org/10.1139/facets-2016-0040 2022-12-31T09:01:36Z We examine the importance of the rock weathering feedback mechanism during the last deglacial period (∼16 000–4000 BCE) using an Earth system model of intermediate complexity (the University of Victoria Earth System Climate Model (UVic ESCM)) with four box-model parameterizations of terrestrial weathering. The deglacial climate change is driven by changes in orbital parameters, ice core reconstructions of atmospheric CO2 variability, and prescribed removal of continental ice sheets. Over the course of the 12 000 year simulation period, increases in weathering provide a mechanism that slowly removes CO2 from the atmosphere, in opposition to the observed atmospheric CO2 increase during this period. These processes transfer both carbon and alkalinity to the ocean, the combination of which results in as much as a 1000 Pg C increase in total ocean carbon, relative to a control simulation with constant weathering. However, the rapid expansion of northern hemisphere vegetation introduces a significant uncertainty among the weathering parameterizations. Further experiments to test the individual impacts of weathering dissolved inorganic carbon and alkalinity fluxes on ocean biogeochemistry suggest that the worldwide distribution of rock types and the ratio of carbonate to silicate weathering may be crucially important in obtaining an accurate estimate of changes in global weathering rates. Article in Journal/Newspaper ice core Directory of Open Access Journals: DOAJ Articles FACETS 2 1 267 285 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
deglacial climate change paleoclimatology climate modeling biogeochemistry weathering Education L Science Q |
spellingShingle |
deglacial climate change paleoclimatology climate modeling biogeochemistry weathering Education L Science Q M.-O. Brault L.A. Mysak H.D. Matthews Carbon cycle implications of terrestrial weathering changes since the last glacial maximum |
topic_facet |
deglacial climate change paleoclimatology climate modeling biogeochemistry weathering Education L Science Q |
description |
We examine the importance of the rock weathering feedback mechanism during the last deglacial period (∼16 000–4000 BCE) using an Earth system model of intermediate complexity (the University of Victoria Earth System Climate Model (UVic ESCM)) with four box-model parameterizations of terrestrial weathering. The deglacial climate change is driven by changes in orbital parameters, ice core reconstructions of atmospheric CO2 variability, and prescribed removal of continental ice sheets. Over the course of the 12 000 year simulation period, increases in weathering provide a mechanism that slowly removes CO2 from the atmosphere, in opposition to the observed atmospheric CO2 increase during this period. These processes transfer both carbon and alkalinity to the ocean, the combination of which results in as much as a 1000 Pg C increase in total ocean carbon, relative to a control simulation with constant weathering. However, the rapid expansion of northern hemisphere vegetation introduces a significant uncertainty among the weathering parameterizations. Further experiments to test the individual impacts of weathering dissolved inorganic carbon and alkalinity fluxes on ocean biogeochemistry suggest that the worldwide distribution of rock types and the ratio of carbonate to silicate weathering may be crucially important in obtaining an accurate estimate of changes in global weathering rates. |
format |
Article in Journal/Newspaper |
author |
M.-O. Brault L.A. Mysak H.D. Matthews |
author_facet |
M.-O. Brault L.A. Mysak H.D. Matthews |
author_sort |
M.-O. Brault |
title |
Carbon cycle implications of terrestrial weathering changes since the last glacial maximum |
title_short |
Carbon cycle implications of terrestrial weathering changes since the last glacial maximum |
title_full |
Carbon cycle implications of terrestrial weathering changes since the last glacial maximum |
title_fullStr |
Carbon cycle implications of terrestrial weathering changes since the last glacial maximum |
title_full_unstemmed |
Carbon cycle implications of terrestrial weathering changes since the last glacial maximum |
title_sort |
carbon cycle implications of terrestrial weathering changes since the last glacial maximum |
publisher |
Canadian Science Publishing |
publishDate |
2017 |
url |
https://doi.org/10.1139/facets-2016-0040 https://doaj.org/article/f530b4c9aa6a420e86a113d8e73094fe |
genre |
ice core |
genre_facet |
ice core |
op_source |
FACETS, Vol 2, Pp 267-285 (2017) |
op_relation |
http://www.facetsjournal.com/doi/10.1139/facets-2016-0040 https://doaj.org/toc/2371-1671 doi:10.1139/facets-2016-0040 2371-1671 https://doaj.org/article/f530b4c9aa6a420e86a113d8e73094fe |
op_doi |
https://doi.org/10.1139/facets-2016-0040 |
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FACETS |
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267 |
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285 |
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1766029540886315008 |