Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea
Abstract We quantified whether pore‐water exchange flushes out saltmarsh sediment carbon, driving carbon outwelling into the ocean and outgassing into the atmosphere. Radon‐derived pore‐water exchange released 1.8 times more sediment carbon in the wet than in dry season. Both crab burrow flushing an...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-08-01
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| Series: | Limnology and Oceanography Letters |
| Online Access: | https://doi.org/10.1002/lol2.10236 |
| _version_ | 1811297128505409536 |
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| author | Xiaogang Chen Isaac R. Santos Duofei Hu Lucheng Zhan Yan Zhang Ze Zhao Shengjie Hu Ling Li |
| author_facet | Xiaogang Chen Isaac R. Santos Duofei Hu Lucheng Zhan Yan Zhang Ze Zhao Shengjie Hu Ling Li |
| author_sort | Xiaogang Chen |
| collection | DOAJ |
| description | Abstract We quantified whether pore‐water exchange flushes out saltmarsh sediment carbon, driving carbon outwelling into the ocean and outgassing into the atmosphere. Radon‐derived pore‐water exchange released 1.8 times more sediment carbon in the wet than in dry season. Both crab burrow flushing and delayed seepage of surface water infiltrating sediments during the spring tide released sediment carbon to surface waters. The outwelling flux of dissolved inorganic carbon exceeded dissolved organic carbon. Carbon dioxide and methane emissions were 169 and 0.25 mmol m−2 d−1, respectively. Pore‐water carbon fluxes exceeded carbon outwelling. This requires some carbon processing within the saltmarsh (e.g., degradation or outgassing to the atmosphere) before pore‐water carbon is exported to the ocean. Overall, pore‐water exchange and outwelling are key components of saltmarsh carbon budgets and should be considered when assessing their carbon sequestration potential and strategies to mitigate climate change. |
| first_indexed | 2024-04-13T05:59:27Z |
| format | Article |
| id | doaj.art-54bf28f5c0f94cb7a22e3c2925df6a05 |
| institution | Directory Open Access Journal |
| issn | 2378-2242 |
| language | English |
| last_indexed | 2024-04-13T05:59:27Z |
| publishDate | 2022-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Limnology and Oceanography Letters |
| spelling | doaj.art-54bf28f5c0f94cb7a22e3c2925df6a052022-12-22T02:59:29ZengWileyLimnology and Oceanography Letters2378-22422022-08-017431232010.1002/lol2.10236Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the seaXiaogang Chen0Isaac R. Santos1Duofei Hu2Lucheng Zhan3Yan Zhang4Ze Zhao5Shengjie Hu6Ling Li7Key Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering Westlake University Hangzhou ChinaDepartment of Marine Sciences University of Gothenburg Gothenburg SwedenKey Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering Westlake University Hangzhou ChinaCollege of Water Conservancy and Hydropower Engineering Hohai University Nanjing ChinaKey Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering Westlake University Hangzhou ChinaKey Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering Westlake University Hangzhou ChinaKey Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering Westlake University Hangzhou ChinaKey Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering Westlake University Hangzhou ChinaAbstract We quantified whether pore‐water exchange flushes out saltmarsh sediment carbon, driving carbon outwelling into the ocean and outgassing into the atmosphere. Radon‐derived pore‐water exchange released 1.8 times more sediment carbon in the wet than in dry season. Both crab burrow flushing and delayed seepage of surface water infiltrating sediments during the spring tide released sediment carbon to surface waters. The outwelling flux of dissolved inorganic carbon exceeded dissolved organic carbon. Carbon dioxide and methane emissions were 169 and 0.25 mmol m−2 d−1, respectively. Pore‐water carbon fluxes exceeded carbon outwelling. This requires some carbon processing within the saltmarsh (e.g., degradation or outgassing to the atmosphere) before pore‐water carbon is exported to the ocean. Overall, pore‐water exchange and outwelling are key components of saltmarsh carbon budgets and should be considered when assessing their carbon sequestration potential and strategies to mitigate climate change.https://doi.org/10.1002/lol2.10236 |
| spellingShingle | Xiaogang Chen Isaac R. Santos Duofei Hu Lucheng Zhan Yan Zhang Ze Zhao Shengjie Hu Ling Li Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea Limnology and Oceanography Letters |
| title | Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea |
| title_full | Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea |
| title_fullStr | Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea |
| title_full_unstemmed | Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea |
| title_short | Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea |
| title_sort | pore water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea |
| url | https://doi.org/10.1002/lol2.10236 |
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