“…Additional source-specific biomarkers such as glycerol dialkyl glycerol tetraethers (GDGTs) (Damsté et al, 2002;Koga et al, 1993), long-chain alkyl diols (de Bar et al, 2020), and sterols (Tao et al, 2022) could further define the origin of organic matter, while other biomarkers such as algal-derived pigments, biopolymeric fraction of carbon, amino acids, and carbohydrates can determine its degree of reactivity (Burdige and Martens, 1988;Dauwe and Middelburg, 1998;Pusceddu et al, 2009;Raja and Rosell-Melé, 2022). Additionally, new proxies are continuously being proposed that can further disentangle the source of organic matter (Lattaud et al, 2021) and help refine the use of biomarker proxy calibration Tingley, 2014, 2018), which can be affected by sediment redistribution and degradation processes (Ausín et al, 2022;Lattaud et al, 2022). Future efforts will be directed into including these variables in MOSAIC to gain a holistic understanding of the fate of organic matter in marine sediments.…”