Karl J Ellefsen
Karl Ellefsen is an Emeritus with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 65
Geochemical and mineralogical maps for soils of the conterminous United States Geochemical and mineralogical maps for soils of the conterminous United States
The U.S. Geological Survey began sampling in 2007 for a low-density (1 site per 1,600 square kilometers, 4,857 sites) geochemical and mineralogical survey of soils in the conterminous United States as part of the North American Soil Geochemical Landscapes Project. The sampling protocol for the national-scale survey included, at each site, a sample from a depth of 0 to 5 centimeters, a...
Authors
David B. Smith, William F. Cannon, Laurel G. Woodruff, Federico Solano, Karl J. Ellefsen
Integrated characterization of the geologic framework of a contaminated site in West Trenton, New Jersey Integrated characterization of the geologic framework of a contaminated site in West Trenton, New Jersey
Fractured sedimentary bedrock and groundwater at the former Naval Air Warfare Center in West Trenton, New Jersey (United States of America) are contaminated with chlorinated solvents. Predicting contaminant migration or removing the contaminants requires an understanding of the geology. Consequently, the geologic framework near the site was characterized with four different methods...
Authors
Karl J. Ellefsen, William C. Burton, Pierre J. Lacombe
Geochemical mapping of the Denver, Colorado (USA) urban area: A comparison of studies in 1972 and 2005 Geochemical mapping of the Denver, Colorado (USA) urban area: A comparison of studies in 1972 and 2005
No abstract available.
Authors
D. B. Smith, R. G. Garrett, G. Closs, K.J. Ellefsen, J.E. Kilburn, J.D. Horton, S. M. Smith
Development of industrial minerals in Colorado Development of industrial minerals in Colorado
Technology and engineering have helped make mining safer and cleaner for both humans and the environment. Inevitably, mineral development entails costs as well as benefits. Developing a mine is an environmental, engineering, and planning challenge that must conform to many Federal, State, and local regulations. Community collaboration, creative design, and best management practices of
Authors
Belinda F. Arbogast, Daniel H. Knepper, William H. Langer, James A. Cappa, John W. Keller, Beth L. Widmann, Karl J. Ellefsen, Terry L. Klein, Jeffrey E. Lucius, John S. Dersch
Computer programs for forward and inverse modeling of acoustic and electromagnetic data Computer programs for forward and inverse modeling of acoustic and electromagnetic data
A suite of computer programs was developed by U.S. Geological Survey personnel for forward and inverse modeling of acoustic and electromagnetic data. This report describes the computer resources that are needed to execute the programs, the installation of the programs, the program designs, some tests of their accuracy, and some suggested improvements.
Authors
Karl J. Ellefsen
Using stable isotopes to understand hydrochemical processes in and around a Prairie Pothole wetland in the Northern Great Plains, USA Using stable isotopes to understand hydrochemical processes in and around a Prairie Pothole wetland in the Northern Great Plains, USA
Millions of internally drained wetland systems in the Prairie Potholes region of the northern Great Plains (USA and Canada) provide indispensable habitat for waterfowl and a host of other ecosystem services. The hydrochemistry of these systems is complex and a crucial control on wetland function, flora and fauna. Wetland waters can have high concentrations of SO2-4 due to the oxidation...
Authors
Christopher T. Mills, Martin B. Goldhaber, Craig A. Stricker, JoAnn M. Holloway, Jean M. Morrison, Karl J. Ellefsen, Donald O. Rosenberry, Roland S. Thurston
Science and Products
Filter Total Items: 65
Geochemical and mineralogical maps for soils of the conterminous United States Geochemical and mineralogical maps for soils of the conterminous United States
The U.S. Geological Survey began sampling in 2007 for a low-density (1 site per 1,600 square kilometers, 4,857 sites) geochemical and mineralogical survey of soils in the conterminous United States as part of the North American Soil Geochemical Landscapes Project. The sampling protocol for the national-scale survey included, at each site, a sample from a depth of 0 to 5 centimeters, a...
Authors
David B. Smith, William F. Cannon, Laurel G. Woodruff, Federico Solano, Karl J. Ellefsen
Integrated characterization of the geologic framework of a contaminated site in West Trenton, New Jersey Integrated characterization of the geologic framework of a contaminated site in West Trenton, New Jersey
Fractured sedimentary bedrock and groundwater at the former Naval Air Warfare Center in West Trenton, New Jersey (United States of America) are contaminated with chlorinated solvents. Predicting contaminant migration or removing the contaminants requires an understanding of the geology. Consequently, the geologic framework near the site was characterized with four different methods...
Authors
Karl J. Ellefsen, William C. Burton, Pierre J. Lacombe
Geochemical mapping of the Denver, Colorado (USA) urban area: A comparison of studies in 1972 and 2005 Geochemical mapping of the Denver, Colorado (USA) urban area: A comparison of studies in 1972 and 2005
No abstract available.
Authors
D. B. Smith, R. G. Garrett, G. Closs, K.J. Ellefsen, J.E. Kilburn, J.D. Horton, S. M. Smith
Development of industrial minerals in Colorado Development of industrial minerals in Colorado
Technology and engineering have helped make mining safer and cleaner for both humans and the environment. Inevitably, mineral development entails costs as well as benefits. Developing a mine is an environmental, engineering, and planning challenge that must conform to many Federal, State, and local regulations. Community collaboration, creative design, and best management practices of
Authors
Belinda F. Arbogast, Daniel H. Knepper, William H. Langer, James A. Cappa, John W. Keller, Beth L. Widmann, Karl J. Ellefsen, Terry L. Klein, Jeffrey E. Lucius, John S. Dersch
Computer programs for forward and inverse modeling of acoustic and electromagnetic data Computer programs for forward and inverse modeling of acoustic and electromagnetic data
A suite of computer programs was developed by U.S. Geological Survey personnel for forward and inverse modeling of acoustic and electromagnetic data. This report describes the computer resources that are needed to execute the programs, the installation of the programs, the program designs, some tests of their accuracy, and some suggested improvements.
Authors
Karl J. Ellefsen
Using stable isotopes to understand hydrochemical processes in and around a Prairie Pothole wetland in the Northern Great Plains, USA Using stable isotopes to understand hydrochemical processes in and around a Prairie Pothole wetland in the Northern Great Plains, USA
Millions of internally drained wetland systems in the Prairie Potholes region of the northern Great Plains (USA and Canada) provide indispensable habitat for waterfowl and a host of other ecosystem services. The hydrochemistry of these systems is complex and a crucial control on wetland function, flora and fauna. Wetland waters can have high concentrations of SO2-4 due to the oxidation...
Authors
Christopher T. Mills, Martin B. Goldhaber, Craig A. Stricker, JoAnn M. Holloway, Jean M. Morrison, Karl J. Ellefsen, Donald O. Rosenberry, Roland S. Thurston