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Resolving distribution and controls of terrigenous and marine particulate organic matter across an energetic shelf
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DOI：10.5194/bg-23-4243-2026.png)
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Abstract
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Abstract. We assess the sources; distribution and controls of particulate organic matter (POM) across the northeastern Taiwan Strait; where monsoonal forcing; water-mass mixing; riverine inputs and sediment resuspension modulate particle dynamics. By integrating lignin biomarkers; bulk geochemistry; and sedimentary constraints within a two-step quantification approach; we demonstrate the influence of river discharge; plume intrusions; and seafloor resuspension on the distribution of terrigenous POM. Terrigenous particulate organic carbon (POCterr) represents a minor component in most water samples but becomes substantial in resuspension-dominated layers. Combining estimated POCterr with modeled current velocities yields an export flux of ∼ 243±56 kt C yr−1; consistent with the regional imbalance between riverine input and sedimentary burial. After correction for terrigenous influence; bulk POM parameters reflect nutrient supply; photoacclimation; and temperature-dependent variation in stable carbon isotopic (δ13C) composition. Comparisons with co-sampled surface sediments show that biomarker signals are preserved more faithfully than δ13C of organic matter; which is strongly modulated by lateral transport. This study provides a practical framework for quantifying terrigenous and marine POM in continental-shelf settings and offers improved constraints for interpreting source-to-sink processes and sedimentary archives.
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