The distribution of rivers to terrestrial sinks: Implications for sediment routing systems

Abstract

Empirical observations used to constrain controls on large global modern river systems typically use catchment delineations depicting drainage patterns of rivers to oceans. A key component in the spatial and temporal discharge of sediment to oceans are terrestrial sinks that act as buffers and sequestrate sediment and nutrients along its route, however, a global catchment model depicting the drainage patterns of rivers to terrestrial sinks does not currently exist. We propose a new global terrestrial sink catchment (GTSC) database that delineates the distribution of high-resolution global river networks in relation to mapped modern terrestrial sinks. The results show a distinct set of characteristics defining the morphology, climate, lithology and sediment discharge of source catchments contributing to terrestrial sinks by tectonic regime. Foreland, intracratonic, extensional and strike-slip tectonic regimes are characterized by small, numerous, densely spaced and wide source catchments where the largest source catchment contributes on average 50%, 43%, 36% and 36%, respectively, of the total suspended sediment load. Forearc and passive margin tectonic regimes are characterized by few, large source catchments where the largest source catchment contributes on average 64% and 63% of the total suspended sediment load. In contrast to forearc and passive margin settings, foreland, intracratonic, extensional and strike-slip settings show source catchments with a range of lithologies and a dominance of seasonal climates, which will likely increase along-strike variability in sediment discharge to their terrestrial sink. The variability of along-strike sediment discharge, sediment composition and source-derived perturbations in sediment discharge to the terrestrial sink will influence the sediments stored and propagation of sediment discharge signals. On geological timescales, marine sedimentary successions and the sediment routing system, likely represents the characteristics of remobilized terrestrial sink sediments during millennial scale perturbations in water discharge. The GTSC database provides a valuable resource to further our quantitative understanding on the role of the terrestrial sink on the broader sediment routing system.

Shifts in the Distribution and Fate of Sedimentary Polycyclic Aromatic Hydrocarbons Within the Estuarine‐Inner Shelf Areas of the East China Sea: Response to Human‐Induced Catchment Change

“…However, river‐borne terrestrial materials being carried to oceans have been changed substantially by intensive human activities such as dam construction, fertilizer use, and water withdrawal (Milliman & Farnsworth, ; Syvitski et al, ); this inevitably influences the ecological environment of estuarine‐inner shelf areas (Tong et al, ; Wang et al, ; Yang et al, ; Zhang et al, ). The sedimentary environment in these regions has also changed, resulting in coarsening surface sediments (Luo et al, ; Yang et al, ), and erosion‐driven coastal retreat (Bentley et al, ; Darby et al, ; Nyberg et al, ; Ogston et al, ; Rahman et al, ), while increasingly serious human‐induced pollution in river catchments potentially influences coastal oceans (Gregg et al, ; Wang et al, ). Overall, human activities have changed the “source to sink” transportation processes of terrigenous materials, similarly influencing the distribution, transport, and burial of PAHs in river catchment‐estuary‐shelf systems.…”

Assessing first‐order BQART estimates for ancient source‐to‐sink mass budget calculations

“…Several approaches have been suggested to reconstruct catchment area including scaling relationships (Bhattacharya et al., 2016; Nyberg, Helland‐Hansen, et al., 2018; Sømme et al., 2009), paleogeographic reconstructions and provenance analysis (Blum et al., 2017).…”

Detrital rutile ages can deduce the tectonic setting of sedimentary basins

“…Although modern sedimentary basins only account for 16% of the terrestrial land surface, river catchments drain 67% of the global non-glaciated land surface to a terrestrial sink (Nyberg et al, 2018), thus making the terrestrial sedimentary record highly representative of the exposed continental crust at the time of deposition. As the sedimentary record goes back as far as 3.8 Ga (Fedo et al, 2001) and is more temporally complete than the igneous record (Cavosie et al, 2005), it is a repository of valuable geological information.…”