scholarly journals Antecedent moisture conditions control mercury and dissolved organic carbon concentration dynamics in a boreal headwater catchment

2014 ◽  
Vol 50 (8) ◽  
pp. 6610-6627 ◽  
Author(s):  
Claire J. Oswald ◽  
Brian A. Branfireun
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Carbon Concentration ◽  
Antecedent Moisture ◽  
Organic Carbon Concentration ◽  
Moisture Conditions ◽  
Headwater Catchment ◽  
Antecedent Moisture Conditions

scholarly journals Storm Dissolved Organic Carbon Dynamics in an Artificially Drained Watershed of the US Midwest

2012 ◽  
Vol 5 ◽  
pp. ASWR.S9973 ◽  
Author(s):  
Philippe G. Vidon ◽  
Hilary A Hubbard ◽  
Pilar E. Cuadra ◽  
Matthew L. Hennessy
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Overland Flow ◽  
Agricultural Watershed ◽  
Antecedent Moisture ◽  
Tile Drains ◽  
The Us ◽  
Moisture Conditions ◽  
Subsurface Drains ◽  
Antecedent Moisture Conditions

This study investigates changes in the nature, concentrations, and fluxes of dissolved organic carbon (DOC) in tile drains (aka subsurface drains), overland flow, and stream flow for 6 spring storms in an artificially drained agricultural watershed. For moderate size storms, DOC concentrations are primarily affected by variations in antecedent moisture conditions. Generally, DOC concentrations and aromaticity increase with flow, especially for storms associated with high antecedent moisture conditions. A shift in the source of DOC to the stream and tile drains from low aromaticity DOC at baseflow, to more aromatic DOC during storms was observed. Data indicates that increases in the frequency and intensity of large precipitation events as well as wetter conditions in spring would likely lead not only to an increase in DOC fluxes (simply because of higher discharge) but also to an increase in the amount of DOC exported for every unit of flow.

scholarly journals Variability of DOC and nitrate responses to storms in a small Mediterranean forested catchment

2002 ◽  
Vol 6 (6) ◽  
pp. 1031-1041 ◽  
Author(s):  
Susana Bernal ◽  
Andrea Butturini ◽  
Francesc Sabater
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
High Flow ◽  
Storm Event ◽  
Storm Events ◽  
Hydrological Responses ◽  
Antecedent Moisture ◽  
Moisture Conditions ◽  
Relevant Factors ◽  
Antecedent Moisture Conditions

Abstract. Severe drought periods followed by intense rainfall often leads to major floods in Mediterranean catchments. The resulting hydrology is complex and the response of solutes in the streams is often unpredictable. This study aimed to identify the most relevant factors controlling the hydrological responses to storms of an intermittent Mediterranean stream and to link those factors with dissolved organic carbon (DOC) and nitrate during storm events. Measurements of climate, hydrology, DOC and nitrate concentrations during 26 storm events over three hydrological years were analysed. The contribution of the storm events to the total DOC and nitrate annual export was also calculated. Nitrate was mainly mobilised during high flow, while most of the DOC export occurred during baseflow. Solute concentrations peaked after drought periods and the solute export was maximal during the largest rainfalls (i.e. > 100 L m-2). One single large storm contributed some 22% of the total annual export of DOC, and about 80% of that of nitrate. Discharge was a good predictor of neither DOC nor nitrate responses, so variables other than discharge were considered. Factor Analysis was used to identify the main factors controlling the biogeochemical responses. Antecedent moisture conditions and the magnitude of the storm event were the most relevant factors and accounted for 63% of the total variance. Solute responses during high flow were highly variable. However, solute concentration changes showed a significant and moderate relationship with the factors controlling the hydrological responses (i.e. Δ DOC v. the antecedent moisture conditions and Δ NO3-N v. the magnitude of the storm event). Keywords: dissolved organic carbon, nitrate, Mediterranean, drought, Fuirosos catchment, storms

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