The age of river‐transported carbon: A global perspective

Marwick, Trent R.; Tamooh, Fredrick; Teodoru, Cristian R.; Borges, Alberto; Darchambeau, François; Bouillon, Steven

doi:10.1002/2014gb004911

Cited by 193 publications

(241 citation statements)

References 116 publications

(220 reference statements)

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“…These processes include within-river POC mineralization, within-river POC deposition, mobilization of POC by lateral erosion of river banks and POC inputs from the terrestrial environment, e.g., by overland flow. Our data suggest that, for the lower Tana River, the losses of OC exceed the amount of OC deposition in the [Bouillon et al, 2009;Marwick et al, 2015] and 2013 (N. Geeraert et al, unpublished, 2015). The wet season signature is similar to that of OC found at the subsurface (<50 cm), above the dotted line.…”

Section: à2mentioning

confidence: 58%

Deposition and fate of organic carbon in floodplains along a tropical semiarid lowland river (Tana River, Kenya)

et al. 2016

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Inland waters organic carbon (OC) burial by sedimentation has recently been shown to be an important component in river catchment carbon (C) budgets. However, data on OC burial by sedimentation are hitherto largely limited to temperate zones. We investigated the deposition and fate of sediment-associated OC in the floodplains of the tropical lowland Tana River (Kenya), between two main gaging stations (Garissa and Garsen). Freshly deposited surface sediments and sediment cores were sampled and analyzed for OC, total nitrogen content, stable isotope signatures (δ 13 C) of OC, and grain size distribution. In addition, we incubated sediment cores to quantify CO 2 production as a proxy for OC mineralization. While the floodplain receives sediment with a relatively low OC content (1.56 ± 0.42%), sediments are enriched with OC inputs from floodplain vegetation to levels above 3%. Sediment cores show a sharp decrease of OC with depth, from 3 to 12% OC in the (sub) surface to less than 1% OC below approximately 60 cm depth. Relatively elevated OC mineralization rates (0.14 ± 0.07 mol. CO 2 kgC À1 d À1) were recorded. We used these data to make a first assessment of the C burial efficiency of the Tana River floodplain. In contrast to what is observed in temperate environments, over 50% of C present in the top layers is lost in less than a century. While significant amounts of OC are buried in the Tana River floodplain, the high rates of postdepositional loss limit the development of a long-term C sink within this tropical floodplain.

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Section: à2mentioning

confidence: 58%

Deposition and fate of organic carbon in floodplains along a tropical semiarid lowland river (Tana River, Kenya)

et al. 2016

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“…Congo River tributaries (Mariotti et al, 1991) Congo River at Brazzaville (Mariotti et al, 1991;Spencer et al 2012;2016;this study) Congo River ≥63 μm POM (Spencer et al, 2012) Congo River upstream (Marwick et al, 2015) …”

Section: O N G O R K a S A I R K A S A I Rmentioning

confidence: 73%

Hydrologic controls on seasonal and inter-annual variability of Congo River particulate organic matter source and reservoir age

et al. 2017

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“…. Identifying major sources of organic carbon to the Godavari River and the offshore sediments core using stable (δ 13 C) and radio (Δ 14 C) isotopes 1075 (Modified after Marwick et al, 2015). The soil end-member is defined based on typical ranges of values reported for tropical and subtropical soils (Pessenda et al, 1997;Shen et al, 2001;Trumbore et al, 1989).…”

Section: Linkages Between Godavari Drainage Basin and Marine Sedimentmentioning

confidence: 99%

Reconciling drainage and receiving basin signatures of the Godavari River system

Usman¹,

Kirkels²,

Zwart³

et al. 2018

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Abstract. The modern-day Godavari River transports large amounts of sediment (170 Tg per year) and terrestrial organic carbon (OC terr ; 1.5 Tg per year) from peninsular India to the Bay of Bengal. The flux and nature of OC terr is considered to have varied in response to past climate and human forcing. In order to delineate the provenance and nature of organic matter (OM) exported 5 by the fluvial system and establish links to sedimentary records accumulating on its adjacent continental margin, the stable and radiogenic isotopic composition of bulk OC, abundance and distribution of long-chain fatty acids (LCFA), sedimentological properties (e.g. grain size, mineral surface area etc.) of fluvial (riverbed and riverbank) sediments and soils from the Godavari 10 basin were analysed and these characteristics were compared to those of a sediment core retrieved from the continental slope depocenter. Results show that river sediments from the upper catchment exhibit higher total organic carbon (TOC) contents than those from the lower part of the basin. The general relationship between TOC and sedimentological parameters (i.e., 15 mineral-specific surface area and grain size) of the sediments suggests that sediment mineralogy, largely driven by provenance, plays an important role in the stabilization of OM during transport along the river axis, and in preservation of OM exported by the Godavari to the Bay of Bengal. The stable carbon isotopic (δ 13 C) characteristics of river sediments and soils indicate that 20

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The age of river‐transported carbon: A global perspective

Cited by 193 publications

References 116 publications

Deposition and fate of organic carbon in floodplains along a tropical semiarid lowland river (Tana River, Kenya)

Deposition and fate of organic carbon in floodplains along a tropical semiarid lowland river (Tana River, Kenya)

Hydrologic controls on seasonal and inter-annual variability of Congo River particulate organic matter source and reservoir age

Reconciling drainage and receiving basin signatures of the Godavari River system

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