Decreasing organic carbon bioreactivity in European rivers

Berggren, Martin; Al-Kharusi, Enass Said

doi:10.1111/fwb.13498

Cited by 18 publications

(7 citation statements)

References 63 publications

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“…Firstly, simulated net primary production (NPP) was compared to two different data products. The first one, the CARbon DAta MOdel fraMework (CARDAMOM; Bloom and Williams, 2015), was built from model data fusion analysis at 1 • resolution. The second one is the Global Inventory Modeling and Mapping Studies (GIMMS) at 0.5 • resolution based on AVHRR and MODIS sensors.…”

Section: Model Evaluationmentioning

confidence: 99%

Spatiotemporal patterns and drivers of terrestrial dissolved organic carbon (DOC) leaching into the European river network

et al. 2022

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Abstract. Leaching of dissolved organic carbon (DOC) from soils into the river network is an important component of the land carbon (C) budget. At regional to global scales, its significance has been estimated through simple mass budgets, often using multi-year averages of observed fluvial DOC fluxes as a proxy of DOC leaching due to the limited availability of observations of the leaching flux itself. This procedure leads to a systematic underestimation of the leaching flux because of the decay of DOC during fluvial transport. Moreover, this procedure does not allow for revealing spatiotemporal variability in DOC leaching from soils, which is vital to better understand the drivers of DOC leaching and its impact on the local soil C budget. In this study, we use the land surface model (LSM) ORCHILEAK to simulate the terrestrial C budget, including leaching of DOC from the soil and its subsequent reactive transport through the river network of Europe. The model performance is evaluated not only against the sparse observations of the soil DOC leaching rate, but also against the more abundant observations of fluxes and reactivity of DOC in rivers, providing further evidence that our simulated DOC fluxes are realistic. The model is then used to simulate the spatiotemporal patterns of DOC leaching across Europe over the period 1972–2012, quantifying both the environmental drivers of these patterns and the impact of DOC leaching on the land C budget. Over the simulation period, we find that, on average, 14.3 Tg C yr−1 of DOC is leached from land into European rivers, which is about 0.6 % of the terrestrial net primary production (NPP), a fraction significantly lower than that reported for tropical river networks. On average, 12.3 Tg C yr−1 of the leached DOC is finally exported to the coast via the river network, and the rest is respired during transit. DOC leaching presents a large seasonal variability, with the maximum occurring in winter and the minimum in summer, except for most parts of northern Europe, where the maximum occurs in spring due to snowmelt. The DOC leaching rate is generally low in warm and dry regions, and high in the cold and wet regions of Europe. Furthermore, runoff and the ratio between runoff from shallower flow paths on one hand and deep drainage and groundwater flow on the other hand are the main drivers of the spatiotemporal variation of DOC leaching. Temperature, as a major control of DOC production and decomposition rates in the soils, plays only a secondary role.

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Section: Model Evaluationmentioning

confidence: 99%

Spatiotemporal patterns and drivers of terrestrial dissolved organic carbon (DOC) leaching into the European river network

et al. 2022

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“…Moreover, only few water quality studies focus on dams as majority focus on streams, lakes, rivers and groundwater. This presents a knowledge gap considering that dams are man-made and have diverse tributaries which empties into them with municipal solid wastes and organic matter debris [8]. Structural design and dam operations may influence its water quality [9].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical analysis of water and sediments of Usuma Dam, Abuja, Nigeria

Ilechukwu

Olusina

Echeta

2020

Ovidius University Annals of Chemistry

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Usuma Dam is the major source of potable water in the Federal Capital Territory, Abuja, Nigeria. The physicochemical properties of water and sediment of the dam was assessed in this study to determine its quality. Electrical conductivity, pH, nitrate, phosphate, total dissolved solids, total suspended solids, turbidity, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, chloride, total hardness, phosphate, nitrate and sulfate were determined in the water samples. Total organic matter, total organic carbon and particle size were among the parameters analyzed in sediments. The parameters were within recommended limits except for biochemical oxygen demand and chemical oxygen demand which were more than the recommended limit of 10 mg/L and 30 mg/L respectively. The total organic matter and the total organic carbon in the sediment samples were between 1.56±0.27 – 2.85±0.20 % and 0.13±0.03 – 0.96±0.03 % respectively. The particle size was in the following order: sand > silt > clay. The results of this study confirmed the presence of high organic and inorganic matter in the dam from non-point pollution sources occasioned by storm water from poorly planned settlements around the dam and runoffs from agricultural practices.

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“…DOM biodegradability, on the other hand, is generally associated with freshly produced material (Lapierre and del Giorgio 2014), which in high order streams and rivers tends to mostly be microbially produced and composed of protein‐like compounds (Fellman et al 2009; Petrone et al 2009; Kellerman et al 2015; Berggren and Al‐Kharusi 2018). Protein‐like components C4 and C5 were indeed removed preferentially following biological incubations (Fig.…”

Section: Discussionmentioning

confidence: 99%

Biological and photochemical reactivity of dissolved organic matter in a large temperate river

Maisonneuve

Guillemette

Lapierre

2022

Limnology & Oceanography

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Large rivers are critical conduits from continents to oceans as they receive, produce and process huge amounts of dissolved organic matter (DOM). Yet, the relative influence of intrinsic DOM properties and extrinsic environmental properties on these processes at the ecosystem‐level is rarely studied. We assessed DOM optical properties as well as bioreactivity and photoreactivity at 40 sites along a >200 km transect of the freshwater portion of the St. Lawrence River through a series of standardized microbial incubations and exposure to simulated sunlight, and then estimated in situ areal rates of processing. We found that biological and photochemical processes preferentially targeted contrasting pools of DOM, but that DOM composition had an undiscernible effect on in situ degradation rates compared to other environmental factors. Total daily processing across the whole water column ranged from 36.7 to 892.1 mg C m−2. In situ photochemical degradation was largely driven by intrinsic DOM photoreactivity rather than environmental drivers in the water. In contrast, we found a relatively constant baseline pool of biolabile DOM that appeared to be independent from changes in concentration and environmental conditions. In situ DOM processing was mostly driven by biological degradation (on average 95%), and disproportionately high biodegradation rates (2.5–4x the average) were found in a few shallower sites near effluents or islands, potentially driven by local increases in nutrient concentration and in the proportion of protein‐like DOM. These results illustrate how DOM composition and degradability interact with ambient environmental and morphological properties to dictate an ecosystem‐level reactivity of DOM.

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Decreasing organic carbon bioreactivity in European rivers

Cited by 18 publications

References 63 publications

Spatiotemporal patterns and drivers of terrestrial dissolved organic carbon (DOC) leaching into the European river network

Spatiotemporal patterns and drivers of terrestrial dissolved organic carbon (DOC) leaching into the European river network

Physicochemical analysis of water and sediments of Usuma Dam, Abuja, Nigeria

Biological and photochemical reactivity of dissolved organic matter in a large temperate river

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