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• W4200438369 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Exchange of carbon between the ocean and the atmosphere is a key process that influences past climates via glacial–interglacial variations of the <span class=inline-formula>CO₂</span> concentration. The melting of ice sheets during deglaciations induces a sea level rise which leads to the flooding of coastal land areas, resulting in the transfer of terrestrial organic matter to the ocean. However, the consequences of such fluxes on the ocean biogeochemical cycle and on the uptake and release of <span class=inline-formula>CO₂</span> are poorly constrained. Moreover, this potentially important exchange of carbon at the land–sea interface is not represented in most Earth system models. We present here the implementation of terrestrial organic matter fluxes into the ocean at the transiently changing land–sea interface in the Max Planck Institute for Meteorology Earth System Model (MPI-ESM) and investigate their effect on the biogeochemistry during the last deglaciation. Our results show that during the deglaciation, most of the terrestrial organic matter inputs to the ocean occurs during Meltwater Pulse 1a (between 15–14 ka) which leads to the transfer of 21.2 <span class=inline-formula>Gt C</span> of terrestrial carbon (mostly originating from wood and humus) to the ocean. Although this additional organic matter input is relatively small in comparison to the global ocean inventory (0.06 %) and thus does not have an impact on the global <span class=inline-formula>CO₂</span> flux, the terrestrial organic matter fluxes initiate oceanic outgassing in regional hotspots like in Indonesia for a few hundred years. Finally, sensitivity experiments highlight that terrestrial organic matter fluxes are the drivers of oceanic outgassing in flooded coastal regions during Meltwater Pulse 1a. Furthermore, the magnitude of outgassing is rather insensitive to higher carbon-to-nutrient ratios of the terrestrial organic matter. Our results provide a first estimate of the importance of terrestrial organic matter fluxes in a transient deglaciation simulation. Moreover, our model development is an important step towards a fully coupled carbon cycle in an Earth system model applicable to simulations at glacial–interglacial cycles." @default.
• W4200438369 created "2021-12-31" @default.
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• W4200438369 date "2021-11-25" @default.
• W4200438369 modified "2023-09-30" @default.
• W4200438369 title "Reply on RC1" @default.
• W4200438369 doi "https://doi.org/10.5194/cp-2021-112-ac2" @default.
• W4200438369 hasPublicationYear "2021" @default.
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