Modeling Terrestrial Dissolved Organic Carbon and Its Effect on the Carbonate System in the Sunda Shelf Seas, Southeast Asia DOI Creative Commons
Bernhard Mayer, Stefan Hagemann, Yongli Zhou

et al.

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

Published: March 28, 2025

Abstract The flux of dissolved organic carbon (DOC) from land to sea is an important transfer within the global cycle. biogeochemical fate this terrestrial DOC (tDOC) remains poorly understood and usually neglected in ocean models. Southeast Asia accounts for around 10% tDOC flux, mostly tropical peatland‐draining rivers discharging onto Sunda Shelf. We developed a new light‐driven parameterization remineralization that photochemical, microbial, interactive photochemical–microbial degradation, simulated transport through Shelf seas using regional 3D hydrodynamical HAMSOM ECOHAM models (only carbonate system). Our realistic hindcast simulations 1958–2022 show about 50% riverine remineralized before leaving shelf. This lowers seawater pH across entire inner by average 0.005 (by up 0.05 Malacca Strait). Correspondingly, raised, increasing yearly outgassing shelf 19% (3.1 Tg C , 0.14 mol ) during 2013–2022. Even acidification trends increase, because river discharge increase. model reveals large spatial variability with greatest inputs close major peatlands, especially off Sumatra Borneo. interannual input monsoonal current reversal lead strong temporal system parameters these areas. results highlight importance representing models, reveal peatland tDOC.

Language: Английский

Modeling Terrestrial Dissolved Organic Carbon and Its Effect on the Carbonate System in the Sunda Shelf Seas, Southeast Asia DOI Creative Commons
Bernhard Mayer, Stefan Hagemann, Yongli Zhou

et al.

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

Published: March 28, 2025

Abstract The flux of dissolved organic carbon (DOC) from land to sea is an important transfer within the global cycle. biogeochemical fate this terrestrial DOC (tDOC) remains poorly understood and usually neglected in ocean models. Southeast Asia accounts for around 10% tDOC flux, mostly tropical peatland‐draining rivers discharging onto Sunda Shelf. We developed a new light‐driven parameterization remineralization that photochemical, microbial, interactive photochemical–microbial degradation, simulated transport through Shelf seas using regional 3D hydrodynamical HAMSOM ECOHAM models (only carbonate system). Our realistic hindcast simulations 1958–2022 show about 50% riverine remineralized before leaving shelf. This lowers seawater pH across entire inner by average 0.005 (by up 0.05 Malacca Strait). Correspondingly, raised, increasing yearly outgassing shelf 19% (3.1 Tg C , 0.14 mol ) during 2013–2022. Even acidification trends increase, because river discharge increase. model reveals large spatial variability with greatest inputs close major peatlands, especially off Sumatra Borneo. interannual input monsoonal current reversal lead strong temporal system parameters these areas. results highlight importance representing models, reveal peatland tDOC.

Language: Английский

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