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Spatio-temporal variation in particulate and dissolved organic matter dynamics in the southern North Sea
In: Biogeochemistry. Springer: Dordrecht; Lancaster; Boston. ISSN 0168-2563; e-ISSN 1573-515X, meer
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North Sea;Particulate organic matter;Dissolved organic matter;Belgian coastal zone;Turbid waters;Phytoplankton;Suspended particulate matter;to-chlorophyll ratio;suspended matter;isotope ratios;carbon;biomass;nitrogen;bay;particles;growth |
| Auteurs | | Top |
- Silori, S.
- Desmit, X., meer
- Fettweis, M., meer
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| Abstract |
Turbid coastal waters are dynamic systems where fine-grained sediments interact with organic matter, significantly influencing the fate of both the components. We investigated the seasonal dynamics of particulate (POC) and dissolved (DOC) organic carbon pools along a suspended particulate matter (SPM) gradient from nearshore to offshore waters in a mid-latitude coastal zone. To assess temporal and spatial variations in POC composition, we quantified the relative contributions of phytoplankton (POCphyto), heterotrophs (POChet), detritus (POCdet), and mineral-associated organic matter (POCmineral) to the bulk POC pool. In nearshore waters, frequent tidal resuspension and high SPM concentrations led to elevated POCdet and POCmineral fractions, masking the increase in POCphyto, despite the higher primary productivity during the spring bloom. In contrast, offshore waters exhibited a greater relative contribution of POCphyto, with seasonal POC increases corresponding to elevated chlorophyll a (Chla) levels in spring and summer, similar to the open-ocean dynamics. These trends were further reflected in particulate organic carbon to nitrogen (POC:PON) ratios and POC:Chla ratios, commonly used to assess sources and quality of organic matter. The cross-shore gradient in organic matter partitioning, with dominance of POC nearshore and DOC offshore, highlights the role of particle resuspension and phytoplankton production in controlling organic carbon distribution between the two pools. Overall, our findings underscore the complex interplay between biological production, nutrient cycling, hydrodynamic forces, and SPM in shaping the composition and fate of organic carbon in turbid coastal systems. |
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