Carbon dioxide uptake in a eutrophic stratified reservoir: Freshwater carbon sequestration potential
Carbon capture and storage due to photosynthesis activities has been proposed as a carbon sink to mitigate climate change. To enhance such mitigation, previous studies have shown that freshwater lakes should be included in the carbon sink, since they may capture as much carbon as coastal areas. In e...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-10-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844023075308 |
| _version_ | 1797646557965713408 |
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| author | Jinichi Sakaguchi Keisuke Nakayama Katsuaki Komai Atsushi Kubo Taketoshi Shimizu Junpei Omori Kohji Uno Tomoyasu Fujii |
| author_facet | Jinichi Sakaguchi Keisuke Nakayama Katsuaki Komai Atsushi Kubo Taketoshi Shimizu Junpei Omori Kohji Uno Tomoyasu Fujii |
| author_sort | Jinichi Sakaguchi |
| collection | DOAJ |
| description | Carbon capture and storage due to photosynthesis activities has been proposed as a carbon sink to mitigate climate change. To enhance such mitigation, previous studies have shown that freshwater lakes should be included in the carbon sink, since they may capture as much carbon as coastal areas. In eutrophic freshwater lakes, there is uncertainty about whether the equilibrium equation can estimate the partial pressure of carbon dioxide (pCO2), owing to the presence of photosynthesis due to phytoplankton, and pH measurement error in freshwater fluid. Thus, this study investigated the applicability of the equilibrium equation and revealed the need to modify it. The modified equilibrium equation was successfully applied to reproduce pCO2 based on total alkalinity and pH through field observations. In addition, pCO2 at the water surface was lower than the atmospheric partial pressure of carbon dioxide due to photosynthesis by phytoplankton during strong stratification. The stratification effect on low pCO2 was verified by using the Net Ecosystem Production (NEP) model, and a submerged freshwater plants such as Potamogeton malaianus were found to have high potential for dissolved inorganic carbon (DIC) sequestration in a freshwater lake. These results should provide a starting point toward more sophisticated methods to investigate the effect of freshwater carbon on DIC uptake in freshwater stratified eutrophic lakes. |
| first_indexed | 2024-03-11T15:03:19Z |
| format | Article |
| id | doaj.art-00037ff91cf3418db94c8d3f6d9407ba |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-11T15:03:19Z |
| publishDate | 2023-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-00037ff91cf3418db94c8d3f6d9407ba2023-10-30T06:05:43ZengElsevierHeliyon2405-84402023-10-01910e20322Carbon dioxide uptake in a eutrophic stratified reservoir: Freshwater carbon sequestration potentialJinichi Sakaguchi0Keisuke Nakayama1Katsuaki Komai2Atsushi Kubo3Taketoshi Shimizu4Junpei Omori5Kohji Uno6Tomoyasu Fujii7Graduate School of Engineering, Kobe University, 1-1 Rokkodai-Cho Nada-Ku, Kobe City, 658-8501, JapanGraduate School of Engineering, Kobe University, 1-1 Rokkodai-Cho Nada-Ku, Kobe City, 658-8501, Japan; Corresponding author.School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami, 090-8507, JapanDepartment of Geoscience, Shizuoka University, 836 Ohya, Suruga-Ku, Shizuoka, 422-8529, JapanWater Quality Laboratory, Kobe City Waterworks Bureau, Kobe, Hyogo, 652-0004, JapanWater Quality Laboratory, Kobe City Waterworks Bureau, Kobe, Hyogo, 652-0004, JapanDepartment of Civil Engineering, Kobe City College of Technology, 8-3 Gakuenhigahimachi, Nishi-ku, Kobe City, 651-2194, JapanSchool of Science Education, Nara University of Education, Takabatake-Cho, Nara, 630-8528, JapanCarbon capture and storage due to photosynthesis activities has been proposed as a carbon sink to mitigate climate change. To enhance such mitigation, previous studies have shown that freshwater lakes should be included in the carbon sink, since they may capture as much carbon as coastal areas. In eutrophic freshwater lakes, there is uncertainty about whether the equilibrium equation can estimate the partial pressure of carbon dioxide (pCO2), owing to the presence of photosynthesis due to phytoplankton, and pH measurement error in freshwater fluid. Thus, this study investigated the applicability of the equilibrium equation and revealed the need to modify it. The modified equilibrium equation was successfully applied to reproduce pCO2 based on total alkalinity and pH through field observations. In addition, pCO2 at the water surface was lower than the atmospheric partial pressure of carbon dioxide due to photosynthesis by phytoplankton during strong stratification. The stratification effect on low pCO2 was verified by using the Net Ecosystem Production (NEP) model, and a submerged freshwater plants such as Potamogeton malaianus were found to have high potential for dissolved inorganic carbon (DIC) sequestration in a freshwater lake. These results should provide a starting point toward more sophisticated methods to investigate the effect of freshwater carbon on DIC uptake in freshwater stratified eutrophic lakes.http://www.sciencedirect.com/science/article/pii/S2405844023075308pCO2StratificationNet ecosystem productionAlgaeFreshwater lake |
| spellingShingle | Jinichi Sakaguchi Keisuke Nakayama Katsuaki Komai Atsushi Kubo Taketoshi Shimizu Junpei Omori Kohji Uno Tomoyasu Fujii Carbon dioxide uptake in a eutrophic stratified reservoir: Freshwater carbon sequestration potential Heliyon pCO2 Stratification Net ecosystem production Algae Freshwater lake |
| title | Carbon dioxide uptake in a eutrophic stratified reservoir: Freshwater carbon sequestration potential |
| title_full | Carbon dioxide uptake in a eutrophic stratified reservoir: Freshwater carbon sequestration potential |
| title_fullStr | Carbon dioxide uptake in a eutrophic stratified reservoir: Freshwater carbon sequestration potential |
| title_full_unstemmed | Carbon dioxide uptake in a eutrophic stratified reservoir: Freshwater carbon sequestration potential |
| title_short | Carbon dioxide uptake in a eutrophic stratified reservoir: Freshwater carbon sequestration potential |
| title_sort | carbon dioxide uptake in a eutrophic stratified reservoir freshwater carbon sequestration potential |
| topic | pCO2 Stratification Net ecosystem production Algae Freshwater lake |
| url | http://www.sciencedirect.com/science/article/pii/S2405844023075308 |
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