Inorganic carbon outwelling from a Mediterranean seagrass meadow using radium isotopes

Majtényi-Hill, Claudia; Reithmaier, Gloria Maria Susanne; Yau, YY; Serrano, Óscar; Piñeiro‐Juncal, Nerea; Santos, Isaac R.

doi:10.1016/j.ecss.2023.108248

Cited by 4 publications

(2 citation statements)

References 81 publications

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“…The northeast exit of the bay is the Mediterranean Sea. CO 2 observations during the same survey are reported in a companion paper (Majtényi‐Hill et al., 2023).…”

Section: Resultsmentioning

confidence: 62%

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Methane Emissions in Seagrass Meadows as a Small Offset to Carbon Sequestration

et al. 2023

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Seagrass meadows are effective carbon sinks recognized for their potential role in climate change mitigation (Fourqurean et al., 2012;Lovelock & Duarte, 2019;Mcleod et al., 2011). Seagrass meadows sequester carbon dioxide (CO 2 ) through photosynthesis (Van Dam et al., 2021) and trap allochthonous particles within their canopy (Gacia et al., 2002). Part of this carbon is then stored as biomass and as organic carbon in sediments for centuries and even millennia (Serrano et al., 2021(Serrano et al., , 2016. Seagrass meadows account for 10%-18% of the total carbon burial (27 44 Tg C yr −1 ) in the ocean, even though they cover only 0.1% of the global ocean area (Kennedy et al., 2010). In addition, about 5% of the particulate organic carbon and dissolved organic carbon produced within seagrass habitats is exported beyond the meadows and stored in the deep ocean (Duarte & Krause-Jensen, 2017). Seagrass meadows are considered an important blue carbon ecosystem that should be protected and restored to mitigate anthropogenic CO 2 emissions.

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“…The northeast exit of the bay is the Mediterranean Sea. CO 2 observations during the same survey are reported in a companion paper (Majtényi‐Hill et al., 2023).…”

Section: Resultsmentioning

confidence: 62%

“…However, 222 Rn did not follow a diel pattern at both stations. While the DO, depth and salinity data during this timeseries were used in a companion paper to estimate primary productivity (Majtényi‐Hill et al., 2023), the CO 2 , CH 4, and 222 Rn data sets are original.…”

Section: Resultsmentioning

confidence: 99%

Methane Emissions in Seagrass Meadows as a Small Offset to Carbon Sequestration

et al. 2023

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Drivers of Seasonal and Diel Methane Emissions From a Seagrass Ecosystem

Henriksson,

Yau,

Majtényi‐Hill

et al. 2024

JGR Biogeosciences

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Seagrass meadows are effective sinks of atmospheric carbon dioxide (CO2). However, there is little insight on how methane (CH4) emissions may potentially offset carbon sequestration in seagrass meadows. Here, we resolve diel and seasonal dynamics of CH4 and CO2 water‐air fluxes over a cold‐temperate Zostera marina seagrass meadow using high‐resolution timeseries observations in seawater. CH4 was emitted from the seagrass‐dominated coastal bay year‐round to atmosphere with CH4 fluxes ranging from 0.2 to 2.6 μmol m−2 d−1. These fluxes are at the lower end of earlier estimates based mostly on short‐term (i.e., 1 day) observations. The 13‐fold seasonal fluctuations in CH4 emissions were greater than the 6‐fold diel fluctuation. Radon observations imply that dissolved CH4 was primarily originated from sediment porewater. The main fate of CH4 in the water was outgassing to the atmosphere via wind forcing. Oxygen and temperature partially controlled dissolved CH4 seasonal dynamics. There was an annual average uptake of CO2 from the atmosphere (−0.9 ± 1.5 mmol m−2 d−1) driven by enhanced photosynthesis in the spring and summer. The CO2‐equivalent CH4 outgassing (0.5 ± 0.6 g CO2 eq m−2 yr−1) offsets only 0.8% of the sediment carbon accumulation in this cold‐temperate Z. marina meadows over a 20‐year time horizon. The CO2‐equivalent CH4 flux was 6% of the average annual CO2 uptake. Hence, CH4 emissions from this cold‐temperate seagrass meadow acted as a minor offset to carbon sequestration.

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Current status and emerging perspectives of coastal blue carbon ecosystems

Alongi¹

2023

Carbon Footprints

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Blue carbon ecosystems require conservation and restoration to maximize organic carbon (CORG) sequestration to ameliorate greenhouse gas emissions. Salt marshes, mangrove forests and seagrass meadows are all autotrophic and are considered blue carbon ecosystems. Macroalgae and tidal flats are currently not considered blue carbon habitats. Blue carbon ecosystems contribute globally to climate change mitigation and at local and national scales, especially in the provision of other ecosystem goods and services. Financial investment is constrained by large uncertainties in CORG dynamics and best practices in restoration, rehabilitation and conservation. Several key emerging perspectives include (1) the fact that groundwater discharge of dissolved carbon is a major pathway of blue carbon loss; (2) allochthonous CORG inputs are required to achieve ecosystem carbon mass balance; (3) blue carbon dynamics are enhanced by habitat connectivity and biotic activities; (4) CH4 and N2O emissions reduce blue carbon potential; (5) habitat destruction causes blue carbon stock losses, but variable gas emissions; (6) sediment blue carbon stocks are increasing at the poles; and (7) land-use and land-cover changes (LULCC) drive changes in blue carbon stocks and emissions. Further research is needed to clarify the applicability of these emerging perspectives.

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Inorganic carbon outwelling from a Mediterranean seagrass meadow using radium isotopes

Cited by 4 publications

References 81 publications

Methane Emissions in Seagrass Meadows as a Small Offset to Carbon Sequestration

Methane Emissions in Seagrass Meadows as a Small Offset to Carbon Sequestration

Drivers of Seasonal and Diel Methane Emissions From a Seagrass Ecosystem

Current status and emerging perspectives of coastal blue carbon ecosystems

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