Cycling of labile and recalcitrant carboxyl-rich alicyclic molecules and carbohydrates in Baffin Bay.

ABSTRACT: Marine dissolved organic matter (DOM) is an important, actively cycling carbon reservoir (662 GtC). However, the chemical structure and cycling of DOM within rapidly warming, polar environments remains largely unconstrained. Previous studies have shown rapid surface cycling of carbohydrates as biologically-labile DOM (LDOM). Conversely, carboxyl-rich alicyclic molecules (CRAM) are often used as examples of biologically-recalcitrant DOM (RDOM). Traditional DOM isolation methods (e.g., ultrafiltration (10-30% of DOM) and solid-phase extraction (40-60% of DOM) induce chemical-, size- and compositional-bias - complicating inferences to total DOM cycling. Here, we use a total DOM proton (¹H) nuclear magnetic resonance (NMR) spectroscopy method to show carbohydrates and CRAM have high

SUBMITTER: McKee K 

PROVIDER: S-EPMC11464691 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature