Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean
Relative to their surface area, estuaries make a disproportionately large contribution of dissolved organic carbon (DOC) to the global carbon cycle, but it is unknown how this will change under a future climate. As such, the response of DOC fluxes from microbially dominated unvegetated sediments to...
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2021
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00055937 2023-05-15T17:50:33+02:00 Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean Simone, Michelle N. Schulz, Kai G. Oakes, Joanne M. Eyre, Bradley D. 2021-03 electronic https://doi.org/10.5194/bg-18-1823-2021 https://noa.gwlb.de/receive/cop_mods_00055937 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055588/bg-18-1823-2021.pdf https://bg.copernicus.org/articles/18/1823/2021/bg-18-1823-2021.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-18-1823-2021 https://noa.gwlb.de/receive/cop_mods_00055937 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055588/bg-18-1823-2021.pdf https://bg.copernicus.org/articles/18/1823/2021/bg-18-1823-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/bg-18-1823-2021 2022-02-08T22:34:17Z Relative to their surface area, estuaries make a disproportionately large contribution of dissolved organic carbon (DOC) to the global carbon cycle, but it is unknown how this will change under a future climate. As such, the response of DOC fluxes from microbially dominated unvegetated sediments to individual and combined future climate stressors of temperature change (from Δ−3 to Δ+5 ∘C compared to ambient mean temperatures) and ocean acidification (OA, ∼ 2× current CO2 partial pressure, pCO2) was investigated ex situ. Warming alone increased sediment heterotrophy, resulting in a proportional increase in sediment DOC uptake; sediments became net sinks of DOC (3.5 to 8.8 mmol C m−2 d−1) at warmer temperatures (Δ+3 and Δ+5 ∘C, respectively). This temperature response changed under OA conditions, with sediments becoming more autotrophic and a greater sink of DOC (up to 4× greater than under current pCO2 conditions). This response was attributed to the stimulation of heterotrophic bacteria with the autochthonous production of labile organic matter by microphytobenthos. Extrapolating these results to the global area of unvegetated subtidal estuarine sediments, we find that the future climate of warming (Δ+3 ∘C) and OA may decrease estuarine export of DOC by ∼ 80 % (∼ 150 Tg C yr−1) and have a disproportionately large impact on the global DOC budget. Article in Journal/Newspaper Ocean acidification Niedersächsisches Online-Archiv NOA Biogeosciences 18 5 1823 1838 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Simone, Michelle N. Schulz, Kai G. Oakes, Joanne M. Eyre, Bradley D. Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean |
topic_facet |
article Verlagsveröffentlichung |
description |
Relative to their surface area, estuaries make a disproportionately large contribution of dissolved organic carbon (DOC) to the global carbon cycle, but it is unknown how this will change under a future climate. As such, the response of DOC fluxes from microbially dominated unvegetated sediments to individual and combined future climate stressors of temperature change (from Δ−3 to Δ+5 ∘C compared to ambient mean temperatures) and ocean acidification (OA, ∼ 2× current CO2 partial pressure, pCO2) was investigated ex situ. Warming alone increased sediment heterotrophy, resulting in a proportional increase in sediment DOC uptake; sediments became net sinks of DOC (3.5 to 8.8 mmol C m−2 d−1) at warmer temperatures (Δ+3 and Δ+5 ∘C, respectively). This temperature response changed under OA conditions, with sediments becoming more autotrophic and a greater sink of DOC (up to 4× greater than under current pCO2 conditions). This response was attributed to the stimulation of heterotrophic bacteria with the autochthonous production of labile organic matter by microphytobenthos. Extrapolating these results to the global area of unvegetated subtidal estuarine sediments, we find that the future climate of warming (Δ+3 ∘C) and OA may decrease estuarine export of DOC by ∼ 80 % (∼ 150 Tg C yr−1) and have a disproportionately large impact on the global DOC budget. |
format |
Article in Journal/Newspaper |
author |
Simone, Michelle N. Schulz, Kai G. Oakes, Joanne M. Eyre, Bradley D. |
author_facet |
Simone, Michelle N. Schulz, Kai G. Oakes, Joanne M. Eyre, Bradley D. |
author_sort |
Simone, Michelle N. |
title |
Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean |
title_short |
Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean |
title_full |
Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean |
title_fullStr |
Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean |
title_full_unstemmed |
Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean |
title_sort |
warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/bg-18-1823-2021 https://noa.gwlb.de/receive/cop_mods_00055937 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055588/bg-18-1823-2021.pdf https://bg.copernicus.org/articles/18/1823/2021/bg-18-1823-2021.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-18-1823-2021 https://noa.gwlb.de/receive/cop_mods_00055937 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055588/bg-18-1823-2021.pdf https://bg.copernicus.org/articles/18/1823/2021/bg-18-1823-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-18-1823-2021 |
container_title |
Biogeosciences |
container_volume |
18 |
container_issue |
5 |
container_start_page |
1823 |
op_container_end_page |
1838 |
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1766157352234385408 |