The Black Sea Deep-Water Circulation: Recent Findings and Prospects for Research

Markova, N. V.

doi:10.1007/978-3-031-16575-7_49

Cited by 1 publication

(2 citation statements)

References 22 publications

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“…To calculate the effects of mixing OM remineralization products into this environment, we use a volume of 32,398 km 3 , which is equivalent to ∼43% of the total volume of the abyssal benthic boundary layer (75,137 km 3 ). This reduced effective volume is an attempt to account for incomplete lateral mixing at depth and can be refined by future studies of advective flow dynamics within the layer (Markova, 2023). The amount of OM respired "instantaneously" in situ was varied from 0 to 40 Tmol C, which is equivalent to 0-1.76 Pg (Gt) CO 2 .…”

Section: The Black Sea: Biogeochemical Impacts Of Organic Matter Sequ...mentioning

confidence: 99%

“…The abyssal Black Sea is characterized by a relatively well‐mixed benthic boundary layer below ∼1,750 m water depth (Murray et al., 1991). Water movement and density homogenization within the deep boundary layer are driven by thermal convection (Ivanov & Samodurov, 2001), while mixing within the mid‐water column is driven primarily by mesoscale cyclonic and occasional anticyclonic eddies (Markova, 2023). Currents in the deep Black Sea thus differ from the well‐known rim current system in surface water.…”

Section: Introductionmentioning

confidence: 99%

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Biomass Storage in Anoxic Marine Basins: Initial Estimates of Geochemical Impacts and CO₂ Sequestration Capacity

Raven,

Crotteau,

Evans

et al. 2024

AGU Advances

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In combination with dramatic and immediate CO2 emissions reductions, net‐negative atmospheric CO2 removal (CDR) is necessary to maintain average global temperature increases below 2.0°C. Many proposed CDR pathways involve the placement of vast quantities of organic carbon (biomass) on the seafloor in some form, but little is known about their potential biogeochemical impacts, especially at scales relevant for global climate. Here, we evaluate the potential impacts and durability of organic carbon storage specifically within deep anoxic basins, where organic matter (OM) is remineralized through anaerobic processes that may enhance its storage efficiency. We present simple biogeochemical and mixing models to quantify the scale of potential impacts of large‐scale OM addition to the abyssal seafloor in the Black Sea, Cariaco Basin, and the hypersaline Orca Basin. These calculations reveal that the Black Sea in particular may have the potential to accept biomass storage at climatically relevant scales with moderate changes to the geochemical state of abyssal water and limited communication of that impact to surface water. Still, all of these systems would require extensive further evaluation prior to consideration of megatonne‐scale CO2 sequestration. Many key unknowns remain, including the partitioning of breakdown among sulfate‐reducing and methanogenic metabolisms and the fate of methane in the environment. Given the urgency of responsible CDR development and the potential for anoxic basins to reduce ecological risks to animal communities, efforts to address knowledge gaps related to microbial kinetics, benthic processes, and physical mixing in these systems are critically needed.

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Section: The Black Sea: Biogeochemical Impacts Of Organic Matter Sequ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biomass Storage in Anoxic Marine Basins: Initial Estimates of Geochemical Impacts and CO₂ Sequestration Capacity

Raven,

Crotteau,

Evans

et al. 2024

AGU Advances

View full text Add to dashboard Cite

show abstract

The Black Sea Deep-Water Circulation: Recent Findings and Prospects for Research

Cited by 1 publication

References 22 publications

Biomass Storage in Anoxic Marine Basins: Initial Estimates of Geochemical Impacts and CO₂ Sequestration Capacity

Biomass Storage in Anoxic Marine Basins: Initial Estimates of Geochemical Impacts and CO₂ Sequestration Capacity

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The Black Sea Deep-Water Circulation: Recent Findings and Prospects for Research

Cited by 1 publication

References 22 publications

Biomass Storage in Anoxic Marine Basins: Initial Estimates of Geochemical Impacts and CO2 Sequestration Capacity

Biomass Storage in Anoxic Marine Basins: Initial Estimates of Geochemical Impacts and CO2 Sequestration Capacity

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Product

Resources

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Biomass Storage in Anoxic Marine Basins: Initial Estimates of Geochemical Impacts and CO₂ Sequestration Capacity

Biomass Storage in Anoxic Marine Basins: Initial Estimates of Geochemical Impacts and CO₂ Sequestration Capacity