Fall 2019 Resources and Publications

UMN research on colored dissolved organic matter (CDOM) and remote sensing of water resources is summarized in informational, pocket-sized brochures. The brochures were developed by Patrick Brezonik, Professor Emeritus and former director of the WRC, as part of an NSF grant. Remote sensing researchers Brezonik, Ben Page, Leif Olmanson and Jacques Finlay created two videos providing an overview of CDOM research.

Boons or Boondoggles: An Assessment of Salton Sea Water Importation Proposals
Levers, L. D.Story and K. Schwabe
In press at California Agriculture, 2019

Several ways to address the looming ecological disaster that is the Salton Sea have been proposed—including ocean water importation proposals. We estimate the relative monetary costs for a “Cortés-to-Salton” proposal importing Sea of Cortés water to the Salton Sea and compare that with the costs of an “Ag-to-Environment” proposal transferring water from agricultural users to the Salton Sea. We find that transferring water from agriculture is substantially cheaper than the Cortés-to-Salton plan. Additionally, all the infrastructure for leasing water currently exists which means, physically, water transfers could begin immediately, an increasingly important characteristic given the present and increasing environmental and human health damages.

Quantitative Dissolution of Environmentally Accessible Iron Residing in Iron-Rich Minerals: A Review
Voelz, J.L., N.W. Johnson, C. L. Chun, W. A. Arnold and R.L. Penn
ACS Earth Space Chemistry 2019

Classifying iron residing in iron-bearing minerals is an important process across numerous disciplines. Iron exists in many forms and with varying degrees of accessibility for reactions. A wide range of procedures exist for identifying and quantifying iron in various forms, but they are scattered throughout numerous journals and typically have several variations. Methods for selective mineral dissolution and iron quantification are reviewed here to improve clarity and accessibility.

Effects of fertilizer timing and variable rate N on nitrate–N losses from a tile drained corn-soybean rotation simulated using DRAINMOD-NII
Wilson, G. L., D. J. Mulla, J. Galzki, A. Laacouri, J. Vetsch and G. Sands
Precision Agriculture 2019

Nitrogen (N) from farm fields is a source of pollution to fresh and marine waters. Modifying N fertilizer application rate and timing to consider the spatial and temporal variability in plant N requirements could reduce N losses from farmlands, resulting in improvements to surface water quality. In this study, the field-scale hydrologic and N simulation model DRAINMOD-NII was used to predict nitrate–N losses from fields planted in a corn-soybean rotation at Waseca, Minnesota, USA, over a 15-year period (2003–2017) for two fertilizer application treatments.

Controlled Environment Food Production for Urban Agriculture
Gomez, C., C.J. Currey, R.W. Dickson, H-J Kim, R. Hernandez, N.C. Sabeh, R. E. Raudales, R.G. Brumfield,
A. Laury-Shaw, A.K. Wilke, R.G. Lopez and S.E. Burnett

The recent increased market demand for locally grown produce is generating interest in the application of techniques developed for controlled environment agriculture (CEA) to urban agriculture (UA). Controlled environments have great potential to revolutionize urban food systems, as they offer unique opportunities for year-round production, optimizing resource-use efficiency, and for helping to overcome significant challenges associated with the high costs of production in urban settings.

Assessing spatial and temporal variability in evapotranspiration for olive orchards in Tunisia using satellite remote sensing
Bchir, A., D.J. Mulla, A.B. Dhiab, F.B. Meriem, W. Bousetta and M. Braham
Precision Agriculture 2019

The objective of this study was to evaluate satellite remote sensing to estimate evapotranspiration (ET) for olive orchards in Tunisia.

Drinking water quality in the glacial aquifer system, northern USA
Erickson, Melinda L, Richard M. Yager, Leon J. Kauffman, and John T. Wilson
Science of the Total Environment 2019

Groundwater quality in the glacial aquifer system, USA, was evaluated by comparing constituent concentrations to benchmarks; exceedance of a benchmark is considered high. Inorganic constituents are common at high concentration across the glacial aquifer, and we estimate more than 4 million people rely on groundwater with high manganese and/or arsenic. An estimated 740 thousand people rely on groundwater with high nitrate. Defined hydrogeologic terranes provide context for interpreting and explaining water quality.

Iron influence on dissolved color in lakes of the Upper Great Lakes States
Brezonik, P.L., J.C. Finlay, C.G. Griffin, W.A. Arnold, E.H. Boardman, N. Germolus, R.M. Hozalski and L.G. Olmanson
PLOS|One 2019

Colored dissolved organic matter (CDOM), a major component of the dissolved organic carbon (DOC) pool in many lakes, is an important controlling factor in lake ecosystem functioning.

Observations of radiatively driven convection in a deep lake
J.A Austin
Limnology and Oceanography 2019

Observations of radiatively driven convection in deep, ice‐free Lake Superior from a set of moorings and an autonomous glider are used to characterize the spatial and temporal scales of the phenomenon. The moored observations show that instability builds at the surface on scales of hours, water near the bottom of the lake begins warming roughly 6 h after sunup, and the water column homogenizes a few hours after sundown.

The wind-driven formation of cross-shelf sediment plumes in a large lake
McKinney, P. J. Austin and G. Fai
Limnology and Oceanography 2019

Wind‐driven turbidity plumes frequently occur in the western arm of Lake Superior and may represent a significant cross‐shelf transport mechanism for sediment, nutrient, and biota. Here, we characterize a plume that formed in late April 2016 using observations from in situ sensors and remote sensing imagery, and estimate the volume of cross‐shelf transport using both the observations and an idealized analytical model of plume formation.