Export mechanisms for dissolved organic carbon and nitrate during summer storm events in a glaciated forested catchment in New York, USA

2004 ◽  
Vol 18 (14) ◽  
pp. 2651-2661 ◽  
Author(s):  
Shreeram P. Inamdar ◽  
Sheila F. Christopher ◽  
Myron J. Mitchell
Keyword(s):  
New York ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Storm Events ◽  
Forested Catchment ◽  
Summer Storm

scholarly journals Elucidating sources of dissolved organic carbon in the riparian zone of a small, forested catchment

2021 ◽  
Author(s):  
Katharina Blaurock ◽  
Stefan Peiffer ◽  
Luisa Hopp ◽  
Benjamin Gilfedder ◽  
Phil Garthen ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Riparian Zone ◽  
Forested Catchment

Losses of phosphorus, nitrogen, dissolved organic carbon and soil from a small agricultural and forested catchment in east-central Finland

2020 ◽  
Vol 302 ◽  
pp. 107075
Author(s):  
Mari Räty ◽  
Kirsi Järvenranta ◽  
Erkki Saarijärvi ◽  
Jari Koskiaho ◽  
Perttu Virkajärvi
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
East Central ◽  
Forested Catchment

Pulsed terrestrial organic carbon persists in an estuarine environment after major storm events

2020 ◽  
Author(s):  
Eero Asmala ◽  
Christopher Osburn ◽  
Ryan Paerl ◽  
Hans Paerl
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
River Estuary ◽  
River Mouth ◽  
Neuse River Estuary ◽  
Storm Events ◽  
Dynamic Component ◽  
Neuse River ◽  
Doc Concentration ◽  
A Minor

<p>The transport of dissolved organic carbon from land to ocean is a large and dynamic component of the global carbon cycle. Export of dissolved organic carbon from watersheds is largely controlled by hydrology, and is exacerbated by increasing major rainfall and storm events, causing pulses of terrestrial dissolved organic carbon (DOC) to be shunted through rivers downstream to estuaries. Despite this increasing trend, the fate of the pulsed terrestrial DOC in estuaries remains uncertain. Here we present DOC data from 1999 to 2017 in Neuse River Estuary (NC, USA) and analyze the effect of six tropical cyclones (TC) during that period on the quantity and fate of DOC in the estuary. We find that that TCs promote a considerable increase in DOC concentration near the river mouth at the entrance to the estuary, on average an increase of 200 µmol l<sup>-1</sup> due to storms was observed. TC-induced increases in DOC are apparent throughout the estuary, and the duration of these elevated DOC concentrations ranges from one month at the river mouth to over six months in lower estuary. Our results suggest that despite the fast mineralization rates, the terrestrial DOC is processed only to a minor extent relative to the pulsed amount entering the estuary. We conclude that the vast quantity of organic carbon delivered to estuaries by TCs transform estuaries from active biogeochemical processing “reactors” of organic carbon to appear more like passive shunts due to the sheer amount of pulsed material rapidly flushed through the estuary.</p>

scholarly journals Small-scale topography explains patterns and dynamics of dissolved organic carbon exports from the riparian zone of a temperate, forested catchment

2021 ◽  
Vol 25 (12) ◽  
pp. 6067-6086
Author(s):  
Benedikt J. Werner ◽  
Oliver J. Lechtenfeld ◽  
Andreas Musolff ◽  
Gerrit H. de Rooij ◽  
Jie Yang ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Surface Runoff ◽  
Stream Water ◽  
Surface Flow ◽  
Small Scale ◽  
Topographic Wetness Index ◽  
Forested Catchment ◽  
Source Zones ◽  
Doc Export

Abstract. Export of dissolved organic carbon (DOC) from riparian zones (RZs) is an important component of temperate catchment carbon budgets, but export mechanisms are still poorly understood. Here we show that DOC export is predominantly controlled by the microtopography of the RZ (lateral variability) and by riparian groundwater level dynamics (temporal variability). From February 2017 until July 2019 we studied topography, DOC quality and water fluxes and pathways in the RZ of a small forested catchment and the receiving stream in central Germany. The chemical classification of the riparian groundwater and surface water samples (n=66) by Fourier transform ion cyclotron resonance mass spectrometry revealed a cluster of plant-derived, aromatic and oxygen-rich DOC with high concentrations (DOCI) and a cluster of microbially processed, saturated and heteroatom-enriched DOC with lower concentrations (DOCII). The two DOC clusters were connected to locations with distinctly different values of the high-resolution topographic wetness index (TWIHR; at 1 m resolution) within the study area. Numerical water flow modeling using the integrated surface–subsurface model HydroGeoSphere revealed that surface runoff from high-TWIHR zones associated with the DOCI cluster (DOCI source zones) dominated overall discharge generation and therefore DOC export. Although corresponding to only 15 % of the area in the studied RZ, the DOCI source zones contributed 1.5 times the DOC export of the remaining 85 % of the area associated with DOCII source zones. Accordingly, DOC quality in stream water sampled under five event flow conditions (n=73) was closely reflecting the DOCI quality. Our results suggest that DOC export by surface runoff along dynamically evolving surface flow networks can play a dominant role for DOC exports from RZs with overall low topographic relief and should consequently be considered in catchment-scale DOC export models. We propose that proxies of spatial heterogeneity such as the TWIHR can help to delineate the most active source zones and provide a mechanistic basis for improved model conceptualization of DOC exports.

Stemflow and dissolved organic carbon cycling: temporal variability in concentration, flux, and UV-Vis spectral metrics in a temperate broadleaved deciduous forest in the eastern United States

2012 ◽  
Vol 42 (1) ◽  
pp. 207-216 ◽  
Author(s):  
Delphis F. Levia ◽  
John T. Van Stan, II ◽  
Shreeram P. Inamdar ◽  
Matthew T. Jarvis ◽  
Myron J. Mitchell ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Deciduous Forest ◽  
Fagus Grandifolia ◽  
Eastern United States ◽  
Storm Events ◽  
Yellow Poplar ◽  
American Beech ◽  
Order Of Magnitude ◽  
Chemical Character

No known research has examined the concentration and flux of dissolved organic carbon (DOC) for stemflow across temporal scales from within single storm events to seasonal and annual scales or employed UV-Vis spectral metrics to examine the chemical character of dissolved organic matter (DOM) of stemflow drainage. Thus, our study examined stemflow DOC concentration and flux and DOM character from American beech ( Fagus grandifolia Ehrh.) and yellow poplar ( Liriodendron tulipifera L.) to address this data gap. Intrastorm stemflow DOC concentrations and fluxes diminished by an order of magnitude over time for American beech but remained relatively constant for yellow poplar. Stemflow DOM aromaticity, however, generally increased and E2:E3 ratios generally decreased as events progressed, suggesting transport of different compounds at different moments. Although less enriched in DOC than yellow poplar, American beech stemflow DOC fluxes were double per annum. Differential interspecific stemflow DOM characteristics are ascribed to (i) significant differences in SUVA254 values (aromaticity) for the leafless season and annually and (ii) significantly higher E2:E3 and SR ratios for yellow poplar stemflow than for American beech annually and across leafed and leafless seasons. Our results suggest that stemflow significantly affects the amount and chemical character of carbon flux to the forest floor that may engender hot spots around tree boles.

Spatiotemporal Analysis of Dissolved Organic Carbon and Nitrate in Waters of a Forested Catchment Using Wavelet Analysis

2017 ◽  
Vol 16 (3) ◽  
pp. vzj2016.09.0077 ◽  
Author(s):  
Susanne Weigand ◽  
Roland Bol ◽  
Barbara Reichert ◽  
Alexander Graf ◽  
Inge Wiekenkamp ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Wavelet Analysis ◽  
Dissolved Organic Carbon ◽  
Spatiotemporal Analysis ◽  
Forested Catchment

Partitioning Light Attenuation in an Acidic Lake

1985 ◽  
Vol 42 (11) ◽  
pp. 1707-1711 ◽  
Author(s):  
Steven W. Effler ◽  
Gary C. Schafran ◽  
Charles T. Driscoll
Keyword(s):  
Thermal Stability ◽  
New York ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Light Absorption ◽  
Light Attenuation ◽  
Systematic Evaluation ◽  
Acidic Lake ◽  
Hypolimnetic Heating ◽  
Thermal Stability Of

Although a number of researchers have reported that acidification of lakes is accompanied by an increase in transparency, there has been no systematic evaluation of the processes responsible for this transformation. In this study we partitioned the attenuation of light in acidic Dart's Lake, located in the Adirondack region of New York from May to September 1982. We observed that changes in light attenuation (Kd) and light absorption (a) were regulated largely by "gelbstoff." Substantial decreases in Kd and a occurred through the study period and were correlated with a depletion in the concentration of dissolved organic carbon (DOC). In-lake concentrations of DOC were controlled by terrigeneous loading and in-lake processes. The decrease in DOC and the attendant decreases in a and Kd were coupled to a loss of Al from the water column of the lake. We suggest that coagulation/adsorption of DOC by Al may have contributed to increases in lake clarity. Increased transparency is significant because it enhances hypolimnetic heating and decreases the thermal stability of lakes.

Seasonal changes in pathways of dissolved organic carbon through a hillslope soil (Xeralf) with contrasting texture

Soil Research ◽  
1992 ◽  
Vol 30 (4) ◽  
pp. 465 ◽  
Author(s):  
DJ Chittleborough ◽  
KRJ Smettem ◽  
E Cotsaris ◽  
FW Leaney
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Overland Flow ◽  
Podzolic Soil ◽  
Marked Decrease ◽  
Soil Surface ◽  
Storm Events ◽  
Dry Period ◽  
Doc Concentration ◽  
Texture Contrast

The pathways of dissolved organic carbon (DOC) through a podzolic soil (Xeralf) with strong texture contrast are described. During winter, most of the DOC passes through macropores in the profile and flows laterally through the B horizons. During summer the presence of dry, hydrophobic organic matter on the soil surface and the A1 horizon causes DOC to flow overland. DOC concentrations vary seasonally. Highest concentrations are measured during summer overland flow. For all horizons, the longer the dry period the greater the DOC concentration in the subsequent flow. During storm events there is a marked flushing effect in the B horizons but in the A horizon and the surface, DOC concentrations tend to rise. There was a marked decrease in DOC concentration in flow from the B3 compared to the upper horizons. This may be due to adsorption by fine clays lining the macropores.

scholarly journals Experimental simulation of the effects of extreme climatic events on major ions, acidity and dissolved organic carbon leaching from a forested catchment, Gårdsjön, Sweden

2011 ◽  
Vol 107 (1-3) ◽  
pp. 455-469 ◽  
Author(s):  
Filip Moldan ◽  
Jakub Hruška ◽  
Christopher D. Evans ◽  
Michael Hauhs
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Major Ions ◽  
Experimental Simulation ◽  
Forested Catchment ◽  
Extreme Climatic Events
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