Fall 2018 Resources and Publications

PFOA and PFOS are Generated from Zwitterionic and Cationic Precursor Compounds During Water Disinfection with Chlorine or Ozone
Xiao, F., R. A. Hanson, S. A. Golovko, M.Y. Golovko and W. A. Arnold
Environmental Science & Technology pp 382–388 2018 
American Chemical Society
The results of this study may provide important insight into the degradation mechanisms of FAs and FSs and shed light on their contribution to the secondary formation of PFOA and PFOS in natural and engineered systems.

Metapopulation stability in branching river networks
Terui, A., N. Ishiyama, H.Urabe, S. Ono, J. C. Finlay and F. Nakamura
Proceedings of the National Academy of Sciences of the United States of America 2018
Metapopulation stability is a critical ecological property. Although ecosystem size has been considered as a fundamental driver of metapopulation stability, current theories developed in simplified landscapes may not be appropriate for complex branching ecosystems, such as rivers. Here, we show that a scale-independent characteristic of fractal river networks, branching complexity (measured as branching probability), stabilizes watershed metapopulations.

Bioavailability of Dissolved Organic Phosphorus in Temperate Lakes
Thompson, S.K. and J. B. Cotner
Frontiers in Environmental Science 2018
Freshwater aquatic systems are biogeochemical hotspots, with heterotrophic bacteria rapidly cycling the compounds that pass through them. P is a key nutrient that controls primary production in many freshwater ecosystems and is important for understanding eutrophication in lakes.

Redox-induced nucleation and growth of goethite on synthetic hematite nanoparticles
Voelz, J.L.,  W. A. Arnold and R. L. Penn
American Mineralogist 2018 103 (7): 1021-1029.
The iron (oxyhydr)oxides hematite (α-Fe2O3) and goethite (α-FeOOH) are natural and reactive minerals common in soils and sediments, and their adsorption of Fe(II) produces reactive surface sites that facilitate reduction of oxidized environmental pollutants.

Agriculture — A river runs through it — The connections between agriculture and water quality
Capel, P.D.,  K. A. McCarthy, R.H. Coupe, K.M. Grey, S. E. Amenumey, N. T. Baker and R.L. Johnson
USGS Circular 1433 2018
A summary of a decade of intensive studies in seven agricultural areas across the United States documents how agricultural activities have altered the natural flow of water and the way that agricultural chemicals enter streams and aquifers. In wet areas, artificial drainage quickly moves water and chemicals from the root zone to ditches and streams; in arid areas, excess irrigation transports sediment and chemicals to streams, and can transport chemicals to groundwater.  This publication provides a framework based on the pathways water follows—drainflow, fastflow, mixed flow, or slowflow—that can guide policy and management decisions to improve water quality.

Multiplex Networks: A framework for studying multi‐process multi‐scale connectivity via coupled‐network theory with an application to river deltas
Tejedor, A,  A. Longjas,  P.Passalacqua,  Y. Moreno  and E. Foufoula‐Georgiou
American Geophysical Union, Geophysical Research Letters 2018
Transport of water, nutrients or energy fluxes in many natural or coupled human‐natural systems occurs along different pathways that often have a wide range of transport timescales and might exchange fluxes with each other dynamically.

Description of soil micro-topography and fractional wetted area under runoff using fractal dimensions
Garcia-Serrana, M., J.S. Gulliver and J.L. Nieber
Earth Surface Processes and Landforms  2018
Understanding the connections between the micro‐topography of a surface and the patterns of shallow overland flow is important to the study of runoff and infiltration processes. In slopes with micro‐topographic features parallel to the flow, water tends to concentrate in channels and only a fraction of the slope contributes to the overland flow. This study aimed to formulate the relevance of the fractal approach for understanding the relation of surface roughness to overland flow patterns.

Multiple linear regression models to predict the formation efficiency of triplet excited states of dissolved organic matter in temperate wetlands
McCabe, A.J. and W.A. Arnold
Limnology and Oceanography  June 2018
The source and composition of dissolved organic matter (DOM) dictates light absorption in surface waters. Sunlight absorption by chromophoric dissolved organic matter (CDOM) forms reactive intermediates and drives global organic carbon processing.