Christopher Mills
Christopher Mills is a Research Chemist with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 23
Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands
Inland waters are increasingly recognized as critical sites of methane emissions to the atmosphere, but the biogeochemical reactions driving such fluxes are less well understood. The Prairie Pothole Region (PPR) of North America is one of the largest wetland complexes in the world, containing millions of small, shallow wetlands. The sediment pore waters of PPR wetlands contain some of...
Authors
Paula Martins, David W. Hoyt, Sheel Bansal, Christopher T. Mills, Malak Tfaily, Brian Tangen, Raymond Finocchiaro, Michael D. Johnston, Brandon C. McAdams, Matthew J. Solensky, Garrett J. Smith, Yu-Ping Chin, Michael J. Wilkins
Changes in pond water levels and surface extent due to climate variability alter solute sources to closed-basin Prairie-Pothole wetland ponds, 1979 to 2012 Changes in pond water levels and surface extent due to climate variability alter solute sources to closed-basin Prairie-Pothole wetland ponds, 1979 to 2012
Wetter conditions beginning in 1993 resulted in marked changes in water levels and surface extent of prairie-pothole region wetland ponds, including closed-basin wetlands in the Cottonwood Lake area of North Dakota, U.S.A. Pond water levels after 1993 were consistently 0.5 to 2 m higher than during 1979–1993 (≤ 1 m deep) in wetlands lacking surface or substantial groundwater outlets, and...
Authors
James W. LaBaugh, David M. Mushet, Donald O. Rosenberry, Ned H. Euliss, Martin B. Goldhaber, Christopher T. Mills, Richard D. Nelson
Controls on the geochemical evolution of Prairie Pothole Region lakes and wetlands over decadal time scales Controls on the geochemical evolution of Prairie Pothole Region lakes and wetlands over decadal time scales
One hundred sixty-seven Prairie Pothole lakes, ponds and wetlands (largely lakes) previously analyzed chemically during the late 1960’s and early to mid-1970’s were resampled and reanalyzed in 2011–2012. The two sampling periods differed climatically. The earlier sampling took place during normal to slightly dry conditions, whereas the latter occurred during and immediately following...
Authors
Martin B. Goldhaber, Christopher T. Mills, David M. Mushet, R. Blaine McCleskey, Jennifer Rover
The use of amino acid indices for assessing organic matter quality and microbial abundance in deep-sea Antarctic sediments of IODP Expedition 318 The use of amino acid indices for assessing organic matter quality and microbial abundance in deep-sea Antarctic sediments of IODP Expedition 318
The Adélie Basin, located offshore of the Wilkes Land margin, experiences unusually high sedimentation rates (~ 2 cm yr− 1) for the Antarctic coast. This study sought to compare depthwise changes in organic matter (OM) quantity and quality with changes in microbial biomass with depth at this high-deposition site and an offshore continental margin site. Sediments from both sites were...
Authors
Stephanie A Carr, Christopher T. Mills, Kevin W Mandernack
Chemical and biotic characteristics of prairie lakes and large wetlands in south-central North Dakota—Effects of a changing climate Chemical and biotic characteristics of prairie lakes and large wetlands in south-central North Dakota—Effects of a changing climate
The climate of the prairie pothole region of North America is known for variability that results in significant interannual changes in water depths and volumes of prairie lakes and wetlands; however, beginning in July 1993, the climate of the region shifted to an extended period of increased precipitation that has likely been unequaled in the preceding 500 years. Associated changing...
Authors
David M. Mushet, Martin B. Goldhaber, Christopher T. Mills, Kyle I. McLean, Vanessa M. Aparicio, R. Blaine McCleskey, JoAnn M. Holloway, Craig A. Stockwell
Weathering and transport of chromium and nickel from serpentinite in the Coast Range ophiolite to the Sacramento Valley, California, USA Weathering and transport of chromium and nickel from serpentinite in the Coast Range ophiolite to the Sacramento Valley, California, USA
A soil geochemical study in northern California was done to investigate the role that weathering and transport play in the regional distribution and mobility of geogenic Cr and Ni, which are both potentially toxic and carcinogenic. These elements are enriched in ultramafic rocks (primarily serpentinite) and the soils derived from them (1700–10,000 mg Cr per kg soil and 1300–3900 mg Ni...
Authors
Jean M. Morrison, Martin B. Goldhaber, Christopher T. Mills, George N. Breit, Robert L. Hooper, JoAnn M. Holloway, Sharon F. Diehl, James F. Ranville
Science and Products
Filter Total Items: 23
Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands
Inland waters are increasingly recognized as critical sites of methane emissions to the atmosphere, but the biogeochemical reactions driving such fluxes are less well understood. The Prairie Pothole Region (PPR) of North America is one of the largest wetland complexes in the world, containing millions of small, shallow wetlands. The sediment pore waters of PPR wetlands contain some of...
Authors
Paula Martins, David W. Hoyt, Sheel Bansal, Christopher T. Mills, Malak Tfaily, Brian Tangen, Raymond Finocchiaro, Michael D. Johnston, Brandon C. McAdams, Matthew J. Solensky, Garrett J. Smith, Yu-Ping Chin, Michael J. Wilkins
Changes in pond water levels and surface extent due to climate variability alter solute sources to closed-basin Prairie-Pothole wetland ponds, 1979 to 2012 Changes in pond water levels and surface extent due to climate variability alter solute sources to closed-basin Prairie-Pothole wetland ponds, 1979 to 2012
Wetter conditions beginning in 1993 resulted in marked changes in water levels and surface extent of prairie-pothole region wetland ponds, including closed-basin wetlands in the Cottonwood Lake area of North Dakota, U.S.A. Pond water levels after 1993 were consistently 0.5 to 2 m higher than during 1979–1993 (≤ 1 m deep) in wetlands lacking surface or substantial groundwater outlets, and...
Authors
James W. LaBaugh, David M. Mushet, Donald O. Rosenberry, Ned H. Euliss, Martin B. Goldhaber, Christopher T. Mills, Richard D. Nelson
Controls on the geochemical evolution of Prairie Pothole Region lakes and wetlands over decadal time scales Controls on the geochemical evolution of Prairie Pothole Region lakes and wetlands over decadal time scales
One hundred sixty-seven Prairie Pothole lakes, ponds and wetlands (largely lakes) previously analyzed chemically during the late 1960’s and early to mid-1970’s were resampled and reanalyzed in 2011–2012. The two sampling periods differed climatically. The earlier sampling took place during normal to slightly dry conditions, whereas the latter occurred during and immediately following...
Authors
Martin B. Goldhaber, Christopher T. Mills, David M. Mushet, R. Blaine McCleskey, Jennifer Rover
The use of amino acid indices for assessing organic matter quality and microbial abundance in deep-sea Antarctic sediments of IODP Expedition 318 The use of amino acid indices for assessing organic matter quality and microbial abundance in deep-sea Antarctic sediments of IODP Expedition 318
The Adélie Basin, located offshore of the Wilkes Land margin, experiences unusually high sedimentation rates (~ 2 cm yr− 1) for the Antarctic coast. This study sought to compare depthwise changes in organic matter (OM) quantity and quality with changes in microbial biomass with depth at this high-deposition site and an offshore continental margin site. Sediments from both sites were...
Authors
Stephanie A Carr, Christopher T. Mills, Kevin W Mandernack
Chemical and biotic characteristics of prairie lakes and large wetlands in south-central North Dakota—Effects of a changing climate Chemical and biotic characteristics of prairie lakes and large wetlands in south-central North Dakota—Effects of a changing climate
The climate of the prairie pothole region of North America is known for variability that results in significant interannual changes in water depths and volumes of prairie lakes and wetlands; however, beginning in July 1993, the climate of the region shifted to an extended period of increased precipitation that has likely been unequaled in the preceding 500 years. Associated changing...
Authors
David M. Mushet, Martin B. Goldhaber, Christopher T. Mills, Kyle I. McLean, Vanessa M. Aparicio, R. Blaine McCleskey, JoAnn M. Holloway, Craig A. Stockwell
Weathering and transport of chromium and nickel from serpentinite in the Coast Range ophiolite to the Sacramento Valley, California, USA Weathering and transport of chromium and nickel from serpentinite in the Coast Range ophiolite to the Sacramento Valley, California, USA
A soil geochemical study in northern California was done to investigate the role that weathering and transport play in the regional distribution and mobility of geogenic Cr and Ni, which are both potentially toxic and carcinogenic. These elements are enriched in ultramafic rocks (primarily serpentinite) and the soils derived from them (1700–10,000 mg Cr per kg soil and 1300–3900 mg Ni...
Authors
Jean M. Morrison, Martin B. Goldhaber, Christopher T. Mills, George N. Breit, Robert L. Hooper, JoAnn M. Holloway, Sharon F. Diehl, James F. Ranville