Evaluation of carbon dioxide partial pressure and air-sea fluxes in the Sea of Marmara DOI Open Access
Seben Yücel, Nagihan E. Korkmaz, Abdullah Aksu

et al.

International Journal of Environment and Geoinformatics, Journal Year: 2024, Volume and Issue: 11(3), P. 147 - 155

Published: Sept. 21, 2024

The increasing impact of global warming has made it crucial to monitor greenhouse gases (GHG). Carbon dioxide (CO2) is especially important due its significant increase. Oceans and seas play a vital role in absorbing excess CO2 from the atmosphere, but they are facing challenges such as ocean acidification damage coral reefs. Therefore, it's essential thoroughly understand climate change human-caused effects take necessary precautions or improve existing measures. In this direction, seawater, determining alkalinity for monitoring CO2, along with other physical chemical parameters, order help set carbon budgets reduce environmental pressures. For purpose, study Sea Marmara, measurements were conducted first time at stations CG2, CG3, MD26, MD24. partial pressure (pCO2) values ranged 95 165 µatm surface all stations, total 1.075 1.46 mmol kg-1 specified depths. Based on these measurements, flux calculated between −1.10 −5.39 m2 day-1, indicating that Marmara acted net sink.

Language: Английский

Coccolithophore blooms boost particle fluxes in the Nordic Seas DOI
Rafael Rasse, Griet Neukermans

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: April 16, 2025

Abstract The biological gravitational pump is the primary mechanism exporting particulate organic carbon from sunlit surface to deep ocean, particularly inhigh-latitude regions. However, mesopelagic budget deficits indicate additional, unaccounted-for mechanisms that enhance particle export. One hypothesis suggests biominerals produced by coccolithophores—calcifying phytoplankton—increase density and sinking speed of marine snow aggregates, thereby boosting Yet, extent this effect remains unclear, due limited in situ observations associated fluxes. Here, we use autonomous BioGeoChemical-Argo float satellite assess, at a basin scale, how coccolithophore blooms influence export Nordic Seas. Our findings reveal bloom intensity correlates with increased fluxes, important implications for oceanic sequestration.

Language: Английский

Citations

0
Aotearoa New Zealand’s marine carbon cycle in a changing climate – Current understanding and future directions DOI Creative Commons
Scott D. Nodder, Cliff S. Law, Erik Behrens

et al.

New Zealand Journal of Marine and Freshwater Research, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 44

Published: Feb. 13, 2025

The marine system plays a critical role in the global climate cycle, as major control of atmospheric carbon dioxide (CO2). Marine primary production (photosynthesis) and remineralisation organic (respiration, degradation) determine amount CO2 sequestered sediments deep-water environments on century to millennial timescales. stocks fluxes cycle are susceptible change impacts other anthropogenic activities that modify key processes. Oceanographic studies Aotearoa New Zealand's Exclusive Economic Zone (NZ EEZ) Territorial Seas over past decades have provided broad knowledge across complex dynamic seascape, but there remain fundamental gaps limit identification response present future threats. In particular, several areas EEZ been under-sampled currently insufficient data establish baselines variability for cycle. We recommend new observational technologies ocean modelling applications be fully developed utilised enable development robust predictive capability our ocean's human-induced perturbations. Future focus oceanic nature-based solutions accelerate uptake will require improved NZ's EEZ.

Language: Английский

Citations

0
Ocean Carbon Export Flux Projections in CMIP6 Earth System Models Across Multiple Export Depth Horizons DOI Creative Commons
Stevie Walker, Hilary I. Palevsky

Global Biogeochemical Cycles, Journal Year: 2025, Volume and Issue: 39(4)

Published: April 1, 2025

Abstract The ocean's biological carbon pump (BCP) plays a key role in global cycling by transporting biologically fixed from the surface to deep ocean. Prior analyses of BCP Earth System Model (ESM) simulations have typically evaluated particulate organic (POC) flux at export depth horizon 100 m. However, this overlooks spatial and temporal variations that sinking POC must penetrate reach mesopelagic or sequester atmosphere on climate‐relevant timescales. We use depth‐resolved output eight Coupled Intercomparison Project Phase 6 (CMIP6) ESMs compare regional changes five horizons −100 m, base euphotic zone (EZ depth), particle compensation (PCD), maximum annual mixed layer (MLD max ), 1,000 m—under high‐emissions scenario SSP5‐8.5. also examine relationship among net primary production, efficiency ocean, transfer regions identifying model‐ region‐specific mechanistic drivers Globally spatially, trends magnitude decline are similar four horizons, multimodel variability change 2100 is greatest m (+4% −55%). This indicates importance improving model parameterizations

Language: Английский

Citations

0
Evolution of Biological Carbon Storage Research: A Bibliometric Study from 1986 to 2024 DOI
Hajjar Hartini Wan Jusoh, Hafizan Juahir, Azimah Ismail

et al.

Published: Jan. 1, 2024

Language: Английский

Citations

0
Evaluation of carbon dioxide partial pressure and air-sea fluxes in the Sea of Marmara DOI Open Access
Seben Yücel, Nagihan E. Korkmaz, Abdullah Aksu

et al.

International Journal of Environment and Geoinformatics, Journal Year: 2024, Volume and Issue: 11(3), P. 147 - 155

Published: Sept. 21, 2024

The increasing impact of global warming has made it crucial to monitor greenhouse gases (GHG). Carbon dioxide (CO2) is especially important due its significant increase. Oceans and seas play a vital role in absorbing excess CO2 from the atmosphere, but they are facing challenges such as ocean acidification damage coral reefs. Therefore, it's essential thoroughly understand climate change human-caused effects take necessary precautions or improve existing measures. In this direction, seawater, determining alkalinity for monitoring CO2, along with other physical chemical parameters, order help set carbon budgets reduce environmental pressures. For purpose, study Sea Marmara, measurements were conducted first time at stations CG2, CG3, MD26, MD24. partial pressure (pCO2) values ranged 95 165 µatm surface all stations, total 1.075 1.46 mmol kg-1 specified depths. Based on these measurements, flux calculated between −1.10 −5.39 m2 day-1, indicating that Marmara acted net sink.

Language: Английский

Citations

0