Temperature, organic matter, and the control of bacterioplankton in the Neuse River and Pamlico Sound estuarine system

Peierls, BL; Paerl, HW

doi:10.3354/ame01415

Cited by 13 publications

(17 citation statements)

References 28 publications

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“…Thus, the decreasing water residence time cannot fully explain the decreasing DOC concentration. Instead, the gradually increasing temperature with declining elevation might have enhanced bacterial respiration (Peierls and Paerl, 2010). The water temperature in the lowland streams was on average 25 ᵒC higher than in the headwater streams (Ran et al, 2017).…”

Section: Discussion 41 Carbon Export Dynamics Within the Catchmentmentioning

confidence: 99%

Riverine carbon export in the arid-semiarid Wuding River catchment on the Chinese Loess Plateau

Ran¹,

Tian²,

Fang³

et al. 2018

Preprint

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Riverine export of terrestrially-derived carbon represent a key component of the global carbon cycle. In this study we quantify the redistribution of riverine carbon within the 15Wuding catchment on the Chinese Loess Plateau. Export of dissolved organic and inorganic carbon (DOC and DIC) exhibited pronounced spatial and temporal variability. While the DOC concentration was spatially comparable within the catchment, it was generally higher in spring and summer than in autumn, especially in the loess subcatchment. This reflects the enhanced organic matter inputs from agricultural tillage in spring and from terrestrial ecosystems in 20 summer. DIC concentration in the loess subcatchment is significantly higher than that in the sandy subcatchment, due largely to dissolution of carbonates that are abundant in loess. In addition, content of particulate organic carbon (POC) shown strong seasonal variability with low values in the wet season owing to input of subsurface soils by gully erosion. The downstream carbon flux was (7±1.9)×10 10 g C year 1 and dominated by DIC and POC. Total CO2 emissions 25 from water surface were (3.7±0.5)×10 10 g C year 1 . Radiocarbon analysis revealed that the degassed CO2 was 8101890 years old, indicating the release of old carbon previously stored in soil horizons. Riverine carbon export in the Wuding catchment has been greatly modified by check dams. Our estimate shows that carbon burial through sediment storage was (7.8±4.1)×10 10 g C year 1 , representing 42% of the total riverine carbon export from terrestrial ecosystems on an 30 annual basis ((18.5±4.5)×10 10 g C year 1 ). Moreover, the riverine carbon export accounted for 16% of the catchment NEP. It appears that the magnitude of carbon sink of terrestrial ecosystems in this arid-semiarid catchment has been significantly offset by riverine carbon export.

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Section: Discussion 41 Carbon Export Dynamics Within the Catchmentmentioning

confidence: 99%

Riverine carbon export in the arid-semiarid Wuding River catchment on the Chinese Loess Plateau

Ran¹,

Tian²,

Fang³

et al. 2018

Preprint

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“…We can also explore how seasonality in both DOC delivery and uptake impact the PSC. According to the Q 10 law, bacterial respiration and production are affected by temperature (Bott and Kaplan 1985, Sander and Kalff 1993, Fischer et al 2002, Peierls and Paerl 2010, with the rates of these processes generally increasing by a factor of 2-3 for every 10°C rise in temperature. In fact, a Q 10 of 2 for the bacterial uptake of riverine DOM has been demonstrated in the lab (Raymond and Bauer 2000 ).…”

Section: Concepts and Synthesismentioning

confidence: 99%

Hydrological and biogeochemical controls on watershed dissolved organic matter transport: pulse‐shunt concept

Raymond

Saiers

Sobczak

2016

Ecology

458

402

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Hydrological precipitation and snowmelt events trigger large "pulse" releases of terrestrial dissolved organic matter (DOM) into drainage networks due to an increase in DOM concentration with discharge. Thus, low-frequency large events, which are predicted to increase with climate change, are responsible for a significant percentage of annual terrestrial DOM input to drainage networks. These same events are accompanied by marked and rapid increases in headwater stream velocity; thus they also "shunt" a large proportion of the pulsed DOM to downstream, higher-order rivers and aquatic ecosystems geographically removed from the DOM source of origin. Here we merge these ideas into the "pulse-shunt concept" (PSC) to explain and quantify how infrequent, yet major hydrologic events may drive the timing, flux, geographical dispersion, and regional metabolism of terrestrial DOM. The PSC also helps reconcile long-standing discrepancies in C cycling theory and provides a robust framework for better quantifying its highly dynamic role in the global C cycle. The PSC adds a critical temporal dimension to linear organic matter removal dynamics postulated by the river continuum concept. It also can be represented mathematically through a model that is based on stream scaling approaches suitable for quantifying the important role of streams and rivers in the global C cycle. Initial hypotheses generated by the PSC include: (1) Infrequent large storms and snowmelt events account for a large and underappreciated percentage of the terrestrial DOM flux to drainage networks at annual and decadal time scales and therefore event statistics are equally important to total discharge when determining terrestrial fluxes. (2) Episodic hydrologic events result in DOM bypassing headwater streams and being metabolized in large rivers and exported to coastal systems. We propose that the PSC provides a framework for watershed biogeochemical modeling and predictions and discuss implications to ecological processes.

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“…Large lagoonal estuaries are common landforms found along the U.S. Atlantic and Gulf coasts (Nichols, 1989) and along the coasts of most continents. They are important systems that have dynamic geological, biological and chemical processes (Peierls and Paerl, 2010), provide habitat to marine organisms, and have great environmental and economic value (Barbier et al, 2011). Physical processes in estuaries and lagoons are driven by tides, river input, and wind stress, but each system responds differently to these forcing functions due to differences in geomorphology (Kjerfve and Magill, 1989) and…”

Section: Introductionmentioning

confidence: 99%

Modeling hydrodynamics of large lagoons: Insights from the Albemarle-Pamlico Estuarine System

Clunies

Mulligan

Mallinson

et al. 2017

Estuarine, Coastal and Shelf Science

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Large estuaries are influenced by winds over adjacent coastal ocean and land areas causing significant spatial variations in water levels, currents and surface waves. In this study we apply a numerical model to simulate hydrodynamics and waves in the Albemarle-Pamlico Estuarine System, a large and shallow back-barrier basin in eastern North Carolina, over a one-month study period (September, 2008) with observations from several storm wind events of differing time scales and directions. Model performance is evaluated for a spatially varying wind field from the North American Regional Reanalysis (NARR) dataset in comparison to spatially uniform forcing from wind observations at offshore, coastal and land-based sites across the region. A spatially uniform wind field from offshore winds observations results in statistically better hydrodynamic simulations of water levels (R=0.88) in the estuaries than NARR (R=0.48) after comparison with measurements and indicates the importance of strong marine winds over most of the estuary surface area.The influence of a prominent bathymetric feature on hydrodynamics in Pamlico Sound is also investigated by numerically removing a 30 km long and 2-3 m deep shoal from the model grid and replacing it with an idealized depth of 6 m. The removal of the shoal increases water level setup by 14% at the estuarine shoreline, decreases current magnitudes by up to 40% in the shoal region and increases significant wave heights locally by up to 25% in the sound, indicating the importance of this relict geomorphic feature as a major control on the hydrodynamic response of the system during wind events.The results suggest that increasing the water depth over the shoal can lead to higher storm surges and wave heights with the possibility of increased inundation and erosion of the back-barrier and mainland coastal regions. The complex bathymetry and marine wind influence are critical input conditions for modelling large and shallow lagoonal estuaries like the Albemarle-Pamlico Estuarine System.

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Temperature, organic matter, and the control of bacterioplankton in the Neuse River and Pamlico Sound estuarine system

Cited by 13 publications

References 28 publications

Riverine carbon export in the arid-semiarid Wuding River catchment on the Chinese Loess Plateau

Riverine carbon export in the arid-semiarid Wuding River catchment on the Chinese Loess Plateau

Hydrological and biogeochemical controls on watershed dissolved organic matter transport: pulse‐shunt concept

Modeling hydrodynamics of large lagoons: Insights from the Albemarle-Pamlico Estuarine System

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