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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ftdoajarticles:oai:doaj.org/article:f81e4a35a7e54e3f9e7090747c809160 2023-05-15T17:50:33+02:00 Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean M. N. Simone K. G. Schulz J. M. Oakes B. D. Eyre 2021-03-01T00:00:00Z https://doi.org/10.5194/bg-18-1823-2021 https://doaj.org/article/f81e4a35a7e54e3f9e7090747c809160 EN eng Copernicus Publications https://bg.copernicus.org/articles/18/1823/2021/bg-18-1823-2021.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-18-1823-2021 1726-4170 1726-4189 https://doaj.org/article/f81e4a35a7e54e3f9e7090747c809160 Biogeosciences, Vol 18, Pp 1823-1838 (2021) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.5194/bg-18-1823-2021 2022-12-31T04:24:56Z 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 CO 2 partial pressure, p CO 2 ) 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 p CO 2 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 Directory of Open Access Journals: DOAJ Articles Biogeosciences 18 5 1823 1838 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 M. N. Simone K. G. Schulz J. M. Oakes B. D. Eyre Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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 CO 2 partial pressure, p CO 2 ) 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 p CO 2 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 |
M. N. Simone K. G. Schulz J. M. Oakes B. D. Eyre |
author_facet |
M. N. Simone K. G. Schulz J. M. Oakes B. D. Eyre |
author_sort |
M. N. Simone |
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://doaj.org/article/f81e4a35a7e54e3f9e7090747c809160 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Biogeosciences, Vol 18, Pp 1823-1838 (2021) |
op_relation |
https://bg.copernicus.org/articles/18/1823/2021/bg-18-1823-2021.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-18-1823-2021 1726-4170 1726-4189 https://doaj.org/article/f81e4a35a7e54e3f9e7090747c809160 |
op_doi |
https://doi.org/10.5194/bg-18-1823-2021 |
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Biogeosciences |
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18 |
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5 |
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1823 |
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1838 |
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1766157366144794624 |