How important is it to integrate riverine suspended sediment chemical composition with depth? Clues from Amazon River depth-profiles

Implications of scatter corrections for absorption measurements on optical closure of Amazon floodplain lakes using the Spectral Absorption and Attenuation Meter (AC-S-WETLabs)

“…The 0.5 μm difference between GF/C and GF/F pore size does not impact considerably TSM concentration measurements in this study, since grain size distribution of the inorganic part (TSIM) of the Amazon waters peaks at particles larger than 1 μm (Bouchez, Gaillardet, France-Lanord, Maurice, & Dutra-Maia, 2011;Bouchez, Lupker, Gaillardet, France-Lanord, & Maurice, 2011). In relation to the organic fraction of TSM (TSOM) it is composed by phytoplankton cells larger than 1 μm (Casali et al, 2011) and debris derived from decomposition of floodplain vegetation (forest, shrubs and macrophytes) much larger than phytoplankton detritus (Richey, Brock, Naiman, Wissmar, & Stallard, 1980).…”

Provenance control on chemical indices of weathering (Taiwan river sands)

“…Because of suspension sorting, element ratios are observed to change systematically from clay transported in rivers as surface load, to progressively coarser silt carried in suspension deeper in the channel, to bedload sand (Bouchez et al, 2011;Lupker et al, 2011). Aluminum, hosted mainly in slow-settling fine-grained and platy phyllosilicates, decreases with increasing grain size and suspension depth, whereas Na, Ca and Sr hosted largely in faster-settling plagioclase increase, and …”

Arctic Deltaic Lake Sediments As Recorders of Fluvial Organic Matter Deposition

“…The East Channel sampling location during freshet would have been roughly 12-13 m deep at its deepest point and roughly 170 m wide based on data collected in August of 2008 by the Geological Survey of Canada using a SwathPlus Interferometric sidescan (data provided by Dustin Whalen) and the hydrographic data from Environment Canada cited above. Due to sorting of sediments vertically and horizontally within the river (e.g., Bouchez et al, 2011;Hilton et al, 2015), the surface samples collected during the freshet may not be representative of the entire riverine suspended sediment load. However, since deltaic lakes receive predominantly near-surface water from the river, surface samples are likely representative of the sediment pool that will be deposited in lake sediments.…”