POSTER SESSION 4
10:30–12:30, Thursday, September 17
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
ABSTRACT 1152 | POSTER 220
CHANGES IN GLOBAL FLUVIAL SEDIMENT CONCENTRATIONS AND FLUXES INTO OCEAN BETWEEN 1985 AND 2020
Fluvial sediment transport, a key pathway for global biogeochemical cycling, has changed markedly in the Anthropocene. However, disaggregating the compound effects of anthropogenic stresses on fluvial sediment transport at the global scale remains a challenge. Here, we map the suspended sediment concentrations (SSC) for global river channels, based on satellite observations between 1985 and 2020, and estimate long-term changes in land-ocean sediment transfer. We found significant (P<0.05) changes in SSC in 67.8% (3.2×105 km) of the examined river channel length, with 43.4% (2.05×105 km) displaying a significant increasing trend, driven mainly by rising rainfall erosion and climate warming. Consequently, a global net increase (+0.58 Gt year–1) in land-ocean sediment flux has been observed over the past four decades, despite sediment trapping by recently constructed dams, mostly in Asia. Our study provides a new baseline for source-to-sink fluvial transport in the Anthropocene that can inform global water resource management and delta management and protection.
Xianghan Sun, Wuhan University, [email protected], https://orcid.org/0000-0001-5070-1663
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
