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- W2001908936 abstract "The forcing of sediment dispersal systems by climate is widely accepted, but there remains disagreement on the general responses to climate change such as, how resulting signals propagate downstream and, ultimately, how they are preserved in the stratigraphic record. Towards a better understanding of these issues, this paper presents a comprehensive overview of Ganges dispersal system behavior since the last interstade, which reveals major, coeval responses to changes in the South Asian monsoon. At >3000 km from its mountain headwaters to deep-sea fan, the Ganges dispersal system is immense and yet shows tight coupling between source area, catchment basin and coastal and marine depocenters. Furthermore, system-wide responses and downstream transfer of the signal appear to occur at least as fast as current temporal resolution of 1–2 ky. This tight linkage of source-to-sink components is considered a function of the southwest (summer) monsoon's overwhelming control on regional hydrology. About 80% of the Ganges discharge and 95% of its sediment load are delivered to the margin during only 4 months, making the system extremely sensitive to this seasonal forcing. In addition, the regional scale and distribution of the monsoon weather system means that changes in atmospheric circulation affect the entire drainage basin rather than local subcomponents. Finally, despite its present intensity, strength of the summer monsoon has varied significantly over the past 150 ky under orbitally driven changes in insolation and global (glacial) boundary conditions. The resulting changes in precipitation, both well above and below modern values, have forced system-wide responses ranging from glacier advance/retreat to sediment fluxes to the margin and deep-sea fan. The overall conclusions are (1) that this immense dispersal system responds to multimillennial-scale (<10 4 years) climate change in a system-wide and largely contemporaneous manner and (2) that major sedimentary signals can be transferred rapidly from source to sink with little apparent attenuation. Furthermore, these acute responses to climate change have produced sedimentary/stratigraphic features that diverge from traditional sequence models in their nature and timing." @default.
- W2001908936 created "2016-06-24" @default.
- W2001908936 creator A5081991788 @default.
- W2001908936 date "2003-11-01" @default.
- W2001908936 modified "2023-10-05" @default.
- W2001908936 title "Response of the Ganges dispersal system to climate change: a source-to-sink view since the last interstade" @default.
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- W2001908936 doi "https://doi.org/10.1016/s0037-0738(03)00217-3" @default.
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