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- W3199264342 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 glacialâinterglacial variations of the <span class=inline-formula>CO<sub>2</sub></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>CO<sub>2</sub></span> are poorly constrained. Moreover, this potentially important exchange of carbon at the landâsea 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 landâsea 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 15â14âka) which leads to the transfer of 21.2â<span class=inline-formula>GtâC</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 (0.06â%) and thus does not have an impact on the global <span class=inline-formula>CO<sub>2</sub></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 glacialâinterglacial cycles." @default.
- W3199264342 created "2021-09-27" @default.
- W3199264342 creator A5034367423 @default.
- W3199264342 date "2021-09-10" @default.
- W3199264342 modified "2023-09-25" @default.
- W3199264342 title "Reply on CC1" @default.
- W3199264342 doi "https://doi.org/10.5194/cp-2021-112-ac1" @default.
- W3199264342 hasPublicationYear "2021" @default.
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