Relationships between dissolved black carbon and dissolved organic matter in streams

Yamashita, Youhei; Kojima, Daiki; Yoshida, Natsumi; Shibata, Hideaki

doi:10.1016/j.chemosphere.2021.129824

Cited by 32 publications

(23 citation statements)

References 57 publications

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“…This discrepancy may be driven, in part, by the general lack of spatiotemporal radiocarbon data for BC in rivers globally. Submicrometre-scale BC soot aerosols deposited within river basins also contribute a minor fraction of riverine DBC 2,29 , of the order of 5-20%, with wide variation across regions 30,31,69,70 .…”

Section: ();mentioning

confidence: 99%

“…Riverine DBC fluxes are usually highest at peak discharge and lowest during baseflow 65,66,[70][71][72] . This coupling between DBC concentration and discharge results from DBC mobilization from upper organic soil horizons during heavy rainfalls 45 .…”

Section: ();mentioning

confidence: 99%

“…At the basin scale, DBC behaves largely conservatively on a timescale of decades to centuries in the absence of photodegradation 45,108,110 . Sorption onto sinking particles is potentially the dominant removal mechanism for DBC in the dark ocean and explains the decrease in DBC concentration along deep-ocean meridional circulation 70 . The global removal flux of DBC to abyssal sediments via sorption to sinking particles has been estimated as 40-85 Tg C per year 100 , which is larger than the estimated global inputs of DBC via rivers and atmospheric deposition.…”

Section: Sources and Fates Of Oceanic Bcmentioning

confidence: 99%

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The black carbon cycle and its role in the Earth system

Coppola

Wagner

Lennartz

et al. 2022

Nat Rev Earth Environ

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Section: ();mentioning

confidence: 99%

Section: ();mentioning

confidence: 99%

Section: Sources and Fates Of Oceanic Bcmentioning

confidence: 99%

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The black carbon cycle and its role in the Earth system

Coppola

Wagner

Lennartz

et al. 2022

Nat Rev Earth Environ

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“…In addition, the EEM spectra of DBC are simpler than those of NDOM, as the latter often contain several peaks in different EEM regions (Chen et al, 2003). To obtain more compositional information about DBC, EEM-PARAFAC has become increasingly popular (Chen et al, 2020;Han et al, 2021;Yamashita et al, 2021). However, this method requires large sample quantities, and the effectiveness of component separation is hard to guarantee.…”

Section: Optical Spectral Characteristics Of Dbcmentioning

confidence: 99%

Analytical methods, molecular structures and biogeochemical behaviors of dissolved black carbon

et al. 2022

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Dissolved black carbon (DBC) is one of the most active fractions in the black carbon (BC) continuum and plays a significant role in the global dissolved organic matter (DOM) pool. Connecting the BC pool between territorial and marine environments, the biogeochemical processes of DBC are significant for many aspects of aquatic chemistry. Once entering the aquatic environment, DBC will undergo degradation and exert continuing effects on water ecology. DBC can change the migration and transport of pollutants and affect associated microbial communities. Therefore, the knowledge of the fate and transport of DBC is of great importance. In this work, the molecular structures of different DBC were examined and summarized to provide a basis for understanding the environmental processes of DBC. Current research progress on the photodegradation of DBC, interactions between DBC and microorganisms, and the effects of DBC on the fate and transport of contaminants were critically reviewed. The qualitative and quantitative analytical methods for DBC were assessed in detail. To date, the environmental behaviors of DBC are far from fully understood in part due to the lack of systematic methods. Compared with the relatively well-studied photodegradation of DBC, microbial transformation of DBC is poorly understood. Moreover, DBC is exposed to continuous light illumination and microbial metabolization, thus the combined effects of photodegradation and biodegradation are crucial to the cycling and turnover of DBC in aquatic environment and deserve further investigations. In addition, research on the sorption processes, redox reactions and DBC-assisted photo-transformations of contaminants is still at its emerging stages.

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“…DIN (NH 4 + , NO 2 − , and NO 3 − ) and phosphate (PO 4 − ) concentrations (µMN and µMP, respectively) were measured by colorimetric analysis using a continuous flow analyzer (QuAAtro, BRAN + LUEBBE GmbH). The TDN concentration (µMN) was determined by measuring the NO 3 − concentration after oxidative decomposition by the wet oxidation method using potassium peroxydisulfate (Yamashita et al, 2021). The detection limit was calculated as the sum of the mean of the blank concentration and thrice the standard deviation.…”

Section: Concentrations Of Doc Tdn and Inorganic Nutrientsmentioning

confidence: 99%

Factors Controlling the Spatial Distribution of Dissolved Organic Matter With Changes in the C/N Ratio From the Upper to Lower Reaches of the Ishikari River, Japan

2022

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Dissolved organic matter (DOM), particularly dissolved organic nitrogen (DON), is an important source of energy and/or organic nutrients for heterotrophic microorganisms in rivers. Although various factors controlling the quantity and quality of stream and riverine DOM have been extensively studied, DON has been under-researched compared to dissolved organic carbon (DOC). The spatial distribution of DOC and DON concentrations with respect to the C/N ratio and DOM optical properties was investigated in the Ishikari River and its tributaries in Hokkaido, northern Japan. Here, the upper reaches are forested and the middle and lower reaches are encompassed by agricultural land, in particular paddy fields. Furthermore, dark incubation experiments were conducted using filtered riverine water (<0.7 µm) to determine the bioavailability of DOC and DON (particularly due to small microorganisms) considered as a factor controlling the spatial distribution. In the mainstream, DOC and DON concentrations increased with river flow in the upper and middle reaches and remained unchanged in the lower reaches. The C/N ratio of bulk DOM decreased continuously from the upper reaches to lower reaches. The optical properties exhibited changes in the DOM characteristics in terms of higher molecular weight and higher aromaticity from the upper to middle reaches, suggesting that flooded paddy fields largely altered the riverine DOM concentration and composition. In the lower reaches, the C/N ratio of the bulk DOM decreased with the river flow. However, according to principal component analysis, no changes were observed in the optical properties with river flow, suggesting that the C/N ratio of bulk DOM changed owing to in situ biological activity in the river. DOC biodegradation was observed at four sites in the upper and middle reaches but not at the two sites in the lower reaches. However, the DON concentration during the dark incubation experiments at all sites did not differ significantly, which implies that microbial degradation, particularly by small microorganisms, is a factor that decreased the C/N ratio of bulk DOM in the upper and middle reaches. In contrast, large microorganisms possibly degraded C-rich DOM to decrease the C/N ratio of bulk DOM in the lower reaches of the Ishikari River.

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Relationships between dissolved black carbon and dissolved organic matter in streams

Cited by 32 publications

References 57 publications

The black carbon cycle and its role in the Earth system

The black carbon cycle and its role in the Earth system

Analytical methods, molecular structures and biogeochemical behaviors of dissolved black carbon

Factors Controlling the Spatial Distribution of Dissolved Organic Matter With Changes in the C/N Ratio From the Upper to Lower Reaches of the Ishikari River, Japan

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