Xianyu Kong

Abstract Arctic warming is expected to increase the terrestrial dissolved organic carbon flux into the central Arctic Ocean, altering biogeochemical cycling by modulating light attenuation, microbial respiration and carbon dioxide release. Quantifying terrestrial inputs remains challenging due to biases in common proxies and uncertainties in endmember characteristics, which complicate traditional mixing models, introducing uncertainties in predicting climate change impacts.

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1 Introduction Dissolved organic matter (DOM) constitutes the largest pool of organic material in the ocean (Hansell et al., 2009). It is a complex mixture of allochthonous (terrestrially derived) and autochthonous (in situ biological production) materials (Stedmon et al., 2007) and plays a crucial role in the global carbon cycle, rivaling the atmospheric CO2 content in scale (Friedlingstein et al., 2022).