scholarly journals Reactivity continuum of dissolved organic carbon decomposition in lake water

2012 ◽  
Vol 117 (G1) ◽  
Author(s):  
Birgit Koehler ◽  
Eddie von Wachenfeldt ◽  
Dolly Kothawala ◽  
Lars J. Tranvik
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Lake Water ◽  
Carbon Decomposition ◽  
Reactivity Continuum

Watershed dissolved organic carbon transport: a modeling approach combining water travel times and reactivity continuum

2020 ◽  
Author(s):  
Giulia Grandi ◽  
Enrico Bertuzzo
Keyword(s):  
Organic Carbon ◽  
Carbon Cycle ◽  
Dissolved Organic Carbon ◽  
Transport Model ◽  
Terrestrial Ecosystems ◽  
Riverine Ecosystems ◽  
Doc Concentration ◽  
Tightly Coupled ◽  
Reactivity Continuum ◽  
Carbon Degradation

<p>Although their contribution was neglected in the past, inland waters play a significant role in the carbon cycle and affect CO<sub>2</sub> global balance. Streams and rivers are now considered not only as pipelines but as active reactors able to collect and transform carbon from terrestrial ecosystems trough drainage, erosion, deposition and respiration. Quantifying the transfer of carbon from the terrestrial to the riverine ecosystems is thus of crucial importance to fully appreciate carbon cycle at the watershed, regional and global scales. Such transfer is largely controlled by the processes occurring in the critical zone where the carbon and water cycles are tightly coupled. Previous studies investigated how hydrological drivers can affect Dissolved Organic Carbon (DOC) concentration in streams highlighting an hysteretic and unsteady behavior for the DOC-discharge relationship. In this study, we focus on the drainage flux from hillslopes to stream and river networks during rainfall events combining a transport model for water and a model of carbon degradation in soil. Using high-frequency records of chloride and DOC in Plynlimon catchments (UK), we employ the recently developed StorAge Selection (SAS) theory to evaluate water travel time and its partition as evapotranspiration, discharge and storage. We combine this approach with the reactivity continuum  theory to model  carbon degradation along the flow paths using a gamma-distribution as probability density function of the quality. The developed model can thus predict not only the flux of DOC released from hillslopes but also its quality (i.e. lability). We also show how the variability of the DOC-discharge relationship can partially be explained by hydrological fluctuations.</p>

Dissolved organic carbon and fluorescence in Lake Hovsgol: factors reducing humic content of the lake water

Limnology ◽  
2003 ◽  
Vol 4 (1) ◽  
pp. 25-33 ◽  
Author(s):  
K. Hayakawa ◽  
T. Sekino ◽  
T. Yoshioka ◽  
M. Maruo ◽  
M. Kumagai
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Lake Water ◽  
Lake Hovsgol

The Role of Iron and Dissolved Organic Carbon in the Absorption of Ultraviolet Radiation in Humic Lake Water

2005 ◽  
Vol 75 (3) ◽  
pp. 393-407 ◽  
Author(s):  
Kelly O. Maloney ◽  
Donald P. Morris ◽  
Carl O. Moses ◽  
Christopher L. Osburn
Keyword(s):  
Organic Carbon ◽  
Ultraviolet Radiation ◽  
Dissolved Organic Carbon ◽  
Lake Water ◽  
Humic Lake

Diatom-inferred dissolved organic carbon reconstructions provide assessments of past UV-B penetration in Canadian Shield lakes

2001 ◽  
Vol 58 (3) ◽  
pp. 543-550 ◽  
Author(s):  
Sushil S Dixit ◽  
W (Bill) Keller ◽  
Aruna S Dixit ◽  
John P Smol
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Lake Water ◽  
Significant Proportion ◽  
Strong Relationship ◽  
Canadian Shield ◽  
Weighted Averaging ◽  
Calibration Data ◽  
Inference Models ◽  
Shield Lakes

Paleolimnological approaches have provided strong inference models for lake-water acidity and metal concentrations in Sudbury-area lakes, but calibration data have not yet been explored for inferring lake-water dissolved organic carbon (DOC). A review of available limnological data provided DOC values for 80 of our 105 calibration lakes, allowing us to examine the relative importance of DOC in determining the distribution of diatom assemblages in Canadian Shield lakes, such as those in the Sudbury region. Canonical correspondence analysis (CCA) indicated that lake-water DOC explained a significant proportion of variation in the diatom data. Our weighted-averaging DOC model showed a strong relationship (r2 = 0.63) between measured and inferred DOC. Using this model, we reconstructed historical DOC concentrations in three Sudbury-area lakes, and then estimated temporal changes in UV-B penetration. These reconstructions showed that lake water DOC concentrations and underwater UV-B penetration have changed markedly in two of the three lakes modeled. The close correspondence between inferred and measured DOC for the 1980s in all three lakes provides further evidence that we have accurately inferred DOC concentrations. Quantitative DOC reconstructions in Sudbury-area lakes offer an excellent technique for assessing past changes in DOC concentrations and UV-B penetration in Canadian Shield lakes.

Re-browning of Sudbury (Ontario, Canada) lakes now approaches pre-acid deposition lake-water dissolved organic carbon levels

2020 ◽  
Vol 725 ◽  
pp. 138347 ◽  
Author(s):  
Carsten Meyer-Jacob ◽  
Andrew L. Labaj ◽  
Andrew M. Paterson ◽  
Brie A. Edwards ◽  
Wendel (Bill) Keller ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Acid Deposition ◽  
Lake Water

Automated determinations of dissolved organic carbon in lake water

1975 ◽  
Vol 47 (12) ◽  
pp. 1943-1946 ◽  
Author(s):  
P. D. Goulden ◽  
Peter. Brooksbank
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Lake Water
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