The importance of the dissolved organic matter pool for the carbon sequestration potential of artificial upwelling
In the face of climate change there is a need to reduce atmospheric CO2 concentrations. Artificial upwelling of nutrient-rich deep waters has been proposed as a method to enhance the biological carbon pump in oligotrophic oceanic regions in order to increase carbon sequestration. Here we examine the...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-11-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.969714/full |
| _version_ | 1798023414810673152 |
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| author | Markel Gómez-Letona Marta Sebastián Isabel Baños María Fernanda Montero Clàudia Pérez Barrancos Clàudia Pérez Barrancos Moritz Baumann Ulf Riebesell Javier Arístegui |
| author_facet | Markel Gómez-Letona Marta Sebastián Isabel Baños María Fernanda Montero Clàudia Pérez Barrancos Clàudia Pérez Barrancos Moritz Baumann Ulf Riebesell Javier Arístegui |
| author_sort | Markel Gómez-Letona |
| collection | DOAJ |
| description | In the face of climate change there is a need to reduce atmospheric CO2 concentrations. Artificial upwelling of nutrient-rich deep waters has been proposed as a method to enhance the biological carbon pump in oligotrophic oceanic regions in order to increase carbon sequestration. Here we examine the effect of different artificial upwelling intensities and modes (single pulse versus recurring pulses) on the dynamics of the dissolved organic matter pool (DOM). We introduced nutrient-rich deep water to large scale mesocosms (~44 m3) in the oligotrophic subtropical North Atlantic and found that artificial upwelling strongly increased DOM concentrations and changed its characteristics. The magnitude of the observed changes was related to the upwelling intensity: more intense treatments led to higher accumulation of dissolved organic carbon (>70 μM of excess DOC over ambient waters for the most intense) and to comparatively stronger changes in DOM characteristics (increased proportions of chromophoric DOM (CDOM) and humic-like fluorescent DOM), suggesting a transformation of the DOM pool at the molecular level. Moreover, the single upwelling pulse resulted in higher CDOM quantities with higher molecular weight than the recurring upwelling mode. Together, our results indicate that under artificial upwelling, large DOM pools may accumulate in the surface ocean without being remineralized in the short-term. Possible reasons for this persistence could be a combination of the molecular diversification of DOM due to microbial reworking, nutrient limitation and reduced metabolic capabilities of the prokaryotic communities within the mesocosms. Our study demonstrates the importance of the DOC pool when assessing the carbon sequestration potential of artificial upwelling. |
| first_indexed | 2024-04-11T17:46:58Z |
| format | Article |
| id | doaj.art-ce0003dec9144c099bf5c501b3c59944 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-11T17:46:58Z |
| publishDate | 2022-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-ce0003dec9144c099bf5c501b3c599442022-12-22T04:11:21ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-11-01910.3389/fmars.2022.969714969714The importance of the dissolved organic matter pool for the carbon sequestration potential of artificial upwellingMarkel Gómez-Letona0Marta Sebastián1Isabel Baños2María Fernanda Montero3Clàudia Pérez Barrancos4Clàudia Pérez Barrancos5Moritz Baumann6Ulf Riebesell7Javier Arístegui8Instituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, Las Palmas, SpainDepartment of Marine Biology and Oceanography, Institut de Ciències del Mar (ICM), Consejo Superior de Investigaciones Científicas, Barcelona, SpainInstituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, Las Palmas, SpainInstituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, Las Palmas, SpainInstituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, Las Palmas, SpainInstituto Español de Oceanografía, Consejo Superior de Investigaciones Científicas (CSIC), Centro Oceanográfico de Canarias, Santa Cruz de Tenerife, SpainMarine Biogeochemistry, Biological Oceanography, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, GermanyMarine Biogeochemistry, Biological Oceanography, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, GermanyInstituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, Las Palmas, SpainIn the face of climate change there is a need to reduce atmospheric CO2 concentrations. Artificial upwelling of nutrient-rich deep waters has been proposed as a method to enhance the biological carbon pump in oligotrophic oceanic regions in order to increase carbon sequestration. Here we examine the effect of different artificial upwelling intensities and modes (single pulse versus recurring pulses) on the dynamics of the dissolved organic matter pool (DOM). We introduced nutrient-rich deep water to large scale mesocosms (~44 m3) in the oligotrophic subtropical North Atlantic and found that artificial upwelling strongly increased DOM concentrations and changed its characteristics. The magnitude of the observed changes was related to the upwelling intensity: more intense treatments led to higher accumulation of dissolved organic carbon (>70 μM of excess DOC over ambient waters for the most intense) and to comparatively stronger changes in DOM characteristics (increased proportions of chromophoric DOM (CDOM) and humic-like fluorescent DOM), suggesting a transformation of the DOM pool at the molecular level. Moreover, the single upwelling pulse resulted in higher CDOM quantities with higher molecular weight than the recurring upwelling mode. Together, our results indicate that under artificial upwelling, large DOM pools may accumulate in the surface ocean without being remineralized in the short-term. Possible reasons for this persistence could be a combination of the molecular diversification of DOM due to microbial reworking, nutrient limitation and reduced metabolic capabilities of the prokaryotic communities within the mesocosms. Our study demonstrates the importance of the DOC pool when assessing the carbon sequestration potential of artificial upwelling.https://www.frontiersin.org/articles/10.3389/fmars.2022.969714/fulldissolved organic carbonchromophoric dissolved organic matterfluorescent dissolved organic mattercarbon sequestrationartificial upwellingfertilization |
| spellingShingle | Markel Gómez-Letona Marta Sebastián Isabel Baños María Fernanda Montero Clàudia Pérez Barrancos Clàudia Pérez Barrancos Moritz Baumann Ulf Riebesell Javier Arístegui The importance of the dissolved organic matter pool for the carbon sequestration potential of artificial upwelling Frontiers in Marine Science dissolved organic carbon chromophoric dissolved organic matter fluorescent dissolved organic matter carbon sequestration artificial upwelling fertilization |
| title | The importance of the dissolved organic matter pool for the carbon sequestration potential of artificial upwelling |
| title_full | The importance of the dissolved organic matter pool for the carbon sequestration potential of artificial upwelling |
| title_fullStr | The importance of the dissolved organic matter pool for the carbon sequestration potential of artificial upwelling |
| title_full_unstemmed | The importance of the dissolved organic matter pool for the carbon sequestration potential of artificial upwelling |
| title_short | The importance of the dissolved organic matter pool for the carbon sequestration potential of artificial upwelling |
| title_sort | importance of the dissolved organic matter pool for the carbon sequestration potential of artificial upwelling |
| topic | dissolved organic carbon chromophoric dissolved organic matter fluorescent dissolved organic matter carbon sequestration artificial upwelling fertilization |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.969714/full |
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