Cordell D. Johnson

Cordell D. Johnson
United States Geological Survey | USGS · Pacific Coastal and Marine Science Center

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5
Publications
955
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35
Citations

Publications

Publications (5)
Presentation
Full-text available
The utility of radon-222 (Rn) as a water-mass tracer is well-proven to study and quantify rates of submarine groundwater discharge (SGD) due to its very short half-life (3.8 d) and its multifold enrichment in groundwater relative to surface water. The industry and research standard to investigate groundwater discharge in coastal settings remains th...
Article
Surface-based 2D electrical resistivity tomography (ERT) surveys were used to characterize permafrost distribution at wetland sites on the alluvial plain north of the Tanana River, 20 km southwest of Fairbanks, Alaska, in June and September 2014. The sites were part of an ecologically-sensitive research area characterizing biogeochemical response o...
Article
Full-text available
Pervasive and sustained coral diseases contribute to the systemic degradation of reef ecosystems, however, to date an understanding of the physicochemical controls on a coral disease event is still largely lacking. Water circulation and residence times and submarine groundwater discharge (SGD) all determine the degree to which reef organisms are ex...
Article
Select coastal regions of the North Slope of Alaska are experiencing high erosion rates that can be attributed in part to recent warming trends and associated increased storm intensity and frequency. The upper sediment column of the coastal North Slope of Alaska can be described as continuous permafrost underlying a thin (typically less than 1-2 m)...
Article
Full-text available
Submarine groundwater discharge (SGD) is an important conduit that links terrestrial and marine environments. SGD conveys both water and water-borne constituents into coastal waters, where these inflows may impact near-shore ecosystem health and sustainability. Multichannel electrical resistivity techniques have proven to be a powerful tool to exam...

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