Jonathan W Johnson
Biography
Education:
- B.S. Geology, West Virginia University
Awards:
- Air Force Commendation Award
- Air Force Humanitarian Award
Science and Products
Palynology Laboratory
In this lab, we specialize in extracting pollen palynomorphs from geologic field samples. We also assist our center's scientists with outreach programs to educate students and inform policy makers as to the importance of our science.
Vertical movement of soluble carbon and nutrients from biocrusts to subsurface mineral soils
Dryland ecosystems can be constrained by low soil fertility. Within drylands, the soil nutrient and organic carbon (C) cycling that does occur is often mediated by soil surface communities known as biological soil crusts (biocrusts), which cycle C and nutrients in the top ca. 0–2 cm of soil. However, the degree to which biocrusts are...
Young, Kristina E.; Ferrenberg, Scott; Reibold, Robin H.; Reed, Sasha; Swenson, Tami; Northen, Trent; Darrouzet-Nardi, Anthony Elevated levels of radiocarbon in methane dissolved in seawater reveal likely local contamination from nuclear powered vessels
Measurements of the natural radiocarbon content of methane (14C-CH4) dissolved in seawater and freshwater have been used to investigate sources and dynamics of methane. However, during investigations along the Atlantic, Pacific, and Arctic Ocean Margins of the United States, as well as in the North American Great Lakes, some samples revealed...
Joung, D.J.; Ruppel, Carolyn D.; Southon, J.; Kessler, John D. Targeted and non-targeted analysis of young-of-year smallmouth bass using comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry
Smallmouth bass in the Susquehanna River Basin, Chesapeake Bay Watershed, USA, have been exhibiting clinical signs of disease and reproductive endocrine disruption (e.g., intersex, male plasma vitellogenin) for over fifteen years. Previous histological and targeted chemical analyses have identified infectious agents and pollutants in fish tissues...
Teehan, Paige; Schall, Megan K.; Blazer, Vicki S.; Dorman, Frank L Post-fire temporal trends in soil-physical and -hydraulic properties and simulated runoff generation: Insights from different burn severities in the 2013 Black Forest Fire, CO, USA
Burn severity influences on post-fire recovery of soil-hydraulic properties controlling runoff generation are poorly understood despite the importance for parameterizing infiltration models. We measured soil-hydraulic properties of field-saturated hydraulic conductivity (Kfs), sorptivity (S), and wetting front potential (ψf) for four years after...
Ebel, Brian A.; Moody, John A.; Martin, Deborah A. Evidence for interannual persistence of infectious influenza A viruses in Alaska wetlands
Influenza A viruses (IAVs) deposited by wild birds into the environment may lead to sporadic mortality events and economically costly outbreaks among domestic birds. There is a paucity of information, however, regarding the persistence of infectious IAVs within the environment following deposition. In this investigation, we assessed the...
Ramey, Andrew M.; Reeves, Andrew B.; Lagassé, Benjamin Joel; Patil, Vijay P.; Hubbard, Laura E.; Kolpin, Dana W.; McCleskey, R. Blaine; Repert, Deborah A.; Stallknecht, David E.; Poulson, Rebecca L. Evaluation of ELISA for the analysis of imidacloprid in biological matrices: Cross-reactivities, matrix interferences, and comparison to LC-MS/MS
Imidacloprid is among the most used pesticides worldwide and there are toxicity concerns for nontarget organisms. Accurate and sensitive methods are necessary to quantitate imidacloprid concentrations in biological matrices to better understand their fate and effects. Here we evaluated an enzyme-linked immunosorbent assay (ELISA) kit for...
Gross, Michael S.; Woodward, Emily; Hladik, Michelle Tungsten skarn potential of the Yukon-Tanana Upland, eastern Alaska, USA—A mineral resource assessment
Tungsten (W) is used in a variety of industrial and technological applications and has been identified as a critical mineral for the United States, India, the European Union, and other countries. These countries rely on W imports mostly from China, which leaves them vulnerable to supply disruption. Consequently, the U.S. government...
Case, George N.D.; Graham, Garth E.; Marsh, Erin E.; Taylor, Ryan; Green, Carlin J.; Brown II, Philip J.; Labay, Keith A.
A decade of geodetic change at Kīlauea’s summit—Observations, interpretations, and unanswered questions from studies of the 2008–2018 Halemaʻumaʻu eruption
On March 19, 2008, a small explosion heralded the onset of an extraordinary eruption at the summit of Kīlauea Volcano. The following 10 years provided unprecedented access to an actively circulating lava lake located within a region monitored by numerous geodetic tools, including Global Navigation Satellite System (GNSS), interferometric synthetic...
Poland, Michael P.; Miklius, Asta; Johanson, Ingrid A.; Anderson, Kyle R. Influence of redox gradients on nitrate transport from the landscape to groundwater and streams
Increases in nitrogen applications to the land surface since the 1950s have led to a cascade of negative environmental impacts, including degradation of drinking water supplies, nutrient enrichment of aquatic ecosystems and contributions to global climate change. In this study, groundwater, streambed porewater, and stream sampling were used to...
Tesoriero, Anthony J.; Stratton, Laurel E.; Miller, Matthew P. Assessing specific-capacity data and short-term aquifer testing to estimate hydraulic properties in alluvial aquifers of the Rocky Mountains, Colorado, USA
Study Region: Rocky Mountains, United StatesStudy Focus: Groundwater-flow modeling requires estimates of hydraulic properties, namely hydraulic conductivity. Hydraulic conductivity values commonly vary over orders of magnitudes however and estimation may require extensive field campaigns applying slug or pumping tests. As an alternative, specific-...
Newman, Connor P.; Kisfalusi, Zachary D.; Holmberg, Michael J.
Managed aquifer recharge suitability—Regional screening and case studies in Jordan and Lebanon
The U.S. Geological Survey, at the request of the U.S. Agency for International Development, led a 5-year regional project to develop and apply methods for water availability and suitability mapping for managed aquifer recharge (MAR) in the Middle East and North Africa region. A regional model of surface runoff for the period from 1984 to 2015 was...
Goode, Daniel J. A greener future for the Galapagos: Forecasting ecosystem productivity by finding climate analogs in time
Forecasting ecosystem response to climate change is critical for guiding policymaking but challenging due to: complicated relationships between microclimates and regional climates; species’ responses that are driven by extremes rather than averages; the multifaceted nature of species’ interactions; and the lack of historical analogs to future...
Browning, Dawn M; Charney, Noah D.; Bastille-Rousseau, Guillaume; Yackulic, Charles; Blake, Stephen; Gibbs, James P.