Summer 2019 Resources and Publications

Arsenic concentrations after drinking water well installation: Time-varying effects on arsenic mobilization
Erickson, M.L., H.F. Malenda, E.C. Berquist and J.D. Ayotte
Science of the Total Environment, August 2019

Chronic exposure to geogenic arsenic via drinking water is a worldwide health concern. However, effects of well installation and operation on arsenic concentrations and mobilization are not well understood. This knowledge gap impacts both reliable detection of arsenic in drinking water and effective public health recommendations to reduce exposure to arsenic. This study examines changes in arsenic and redox geochemistry over one year following installation of 254 new domestic water wells in three regions of the north-central USA that commonly have elevated arsenic concentrations.

A harmonized image processing workflow using Sentinel-2/MSI and Landsat-8/OLI for mapping water clarity in optically variable lake systems
Page, B.P., L.G. Olmanson and D.R. Mishra
Remote Sensing of Environment, September 2019

This study demonstrates the applicability of harmonizing Sentinel-2 MultiSpectral Imager (MSI) and Landsat-8 Operational Land Imager (OLI) satellite imagery products to enable the monitoring of inland lake water clarity in the Google Earth Engine (GEE) environment. 

The Effect of Goldfish (Carassius auratus) on Water Quality in Horse Stock Tanks
Catalano, D.N., H.J. Bradley, S. Missaghi, M.R. Hathaway and K. L. Martinson
ScienceDirect, August 2019

Goldfish (Carassius auratus) have been reported as a method to keep water tanks clean; however, little information exists on this approach. The objectives were to evaluate the efficacy of goldfish on maintaining water quality in tanks and to evaluate the frequency that this method is used. 

Climatic Controls on Landscape Dissection and Network Structure in the Absence of Vegetation
Hooshyar, M., A. Singh, D. Wang and E. Foufoula-Georgiou
Geophysical Research Letters, March 2019

Drainage networks emerge due to the movement of sediment driven by climatic and tectonic forcings. Previous observations revealed the dependence of drainage density (Dd) on climatic factors such as mean annual precipitation (MAP). Specifically, it has been observed in intermediate climate (~175 mm < MAP < 700 mm) that Dd decreases with increasing MAP. This declining trend has been argued to be attributed to biotic activity, that is, the dominance of vegetation growth over runoff erosive force.

Effect of dissolved iron on CDOM and other optical properties for dissolved organic matter in lakes and rivers of the Upper Great Lakes states
Brezonik, P.L.,  J.C. Finlay and  R.M. Hozalski
UMN Data Repository, 2019

These files contain the raw field and lab data collected during sampling of lakes and a few rivers in 2014-2016 to evaluate the importance of dissolved iron concentrations in affecting apparent levels of colored dissolved organic matter (CDOM), as measured spectrophotometrically by light absorption coefficient at 440 nm, a(440), with additional sampling in 2018 for more specific purposes.

Visitor preferences at Osceola Landing on the St Croix National Scenic Riverway
Schneider, I.E and E. Tsakakis, 2019
Prepared for the National Park Service

In response to managerial concerns and increased visitor presence along the St. Croix National Scenic Riverway (SACN), systematic visitor observation occurred 2017 at three landings: Osceola, Earl and Whispering Pines (Schneider et al. 2018). Following the observational phase, Riverway personnel requested a survey to evaluate visitor experiences with attention to maintaining scenic Riverway qualities, assessing quality visitor experiences, and improving safety.

Snow algae drive productivity and weathering at volcanic rock-hosted glaciers
Havig, J.R. and T.L. Hamilton
ScienceDirect, February 2019

Earth has experienced periodic local to global glaciation for nearly 3 billion years, providing supra- and subglacial environments for colonization by microbial communities. A number of studies have reported on the role of microbial communities in glacial ecosystems including their influence on element cycling and weathering, but there is a paucity data on volcanic rock-hosted glacial ecosystems.

Hypolithic Photosynthesis in Hydrothermal Areas and Implications for Cryptic Oxygen Oases on Archean Continental Surfaces
Havig, J.R. and T.L. Hamilton
Frontiers in Earth Science, February 2019

Here, we explore phototrophic communities in both hypolithic and hot spring environments in Yellowstone National Park as potential analogs to Archean continental surfaces. Hypolithic communities in geothermal settings were similar in both composition and carbon uptake rates to proximal hot spring communities.