Thomas Lorenson (Former Employee)
Science and Products
Filter Total Items: 14
Permafrost Mapping in Two Wetland Systems North of the Tanana River in Interior Alaska 2014 Permafrost Mapping in Two Wetland Systems North of the Tanana River in Interior Alaska 2014
Surface-based 2D electrical resistivity tomography (ERT) surveys were used to investigate the distribution of permafrost 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 contained habitat types characteristic of interior Alaska, including thermokarst bog, forested permafrost plateau, and a rich...
Geochemical analysis of seeps along the Queen Charlotte Fault Geochemical analysis of seeps along the Queen Charlotte Fault
Geochemical analyses of authigenic carbonates, bivalves, and pore fluids were performed on samples collected from seep fields along the Queen Charlotte Fault, a right lateral transform boundary that separates the Pacific and North American tectonic plates. Samples were collected using grab samplers and piston cores, and were collected during three different research cruises in 2011, 2015...
Filter Total Items: 49
National Gas Hydrate Program Expedition 01 offshore India; gas hydrate systems as revealed by hydrocarbon gas geochemistry National Gas Hydrate Program Expedition 01 offshore India; gas hydrate systems as revealed by hydrocarbon gas geochemistry
The National Gas Hydrate Program Expedition 01 (NGHP-01) targeted gas hydrate accumulations offshore of the Indian Peninsula and along the Andaman convergent margin. The primary objectives of coring were to understand the geologic and geochemical controls on the accumulation of methane hydrate and their linkages to underlying petroleum systems. Four areas were investigated: 1) the Kerala...
Authors
Thomas Lorenson, Timothy S. Collett
A new model for turbidity current behavior based on integration of flow monitoring and precision coring in a submarine canyon A new model for turbidity current behavior based on integration of flow monitoring and precision coring in a submarine canyon
Submarine turbidity currents create some of the largest sediment accumulations on Earth, yet there are few direct measurements of these flows. Instead, most of our understanding of turbidity currents results from analyzing their deposits in the sedimentary record. However, the lack of direct flow measurements means that there is considerable debate regarding how to interpret flow...
Authors
William O. Symons, Esther J. Sumner, Charles K. Paull, Matthieu J.B. Cartigny, Jingping Xu, Katherine L. Maier, Thomas Lorenson, Peter J. Talling
Dissolved methane in the Beaufort Sea and the Arctic Ocean, 1992-2009; sources and atmospheric flux Dissolved methane in the Beaufort Sea and the Arctic Ocean, 1992-2009; sources and atmospheric flux
Methane concentration and isotopic composition was measured in ice-covered and ice-free waters of the Arctic Ocean during eleven surveys spanning the years of 1992-1995 and 2009. During ice-free periods, methane flux from the Beaufort shelf varies from 0.14 to 0.43 mg CH4 m-2 day-1. Maximum fluxes from localized areas of high methane concentration are up to 1.52 mg CH4 m-2 day-1...
Authors
Thomas D. Lorenson, Jens Greinert, Richard B. Coffin
Seasonal electrical resistivity surveys of a coastal bluff, Barter Island, North Slope Alaska Seasonal electrical resistivity surveys of a coastal bluff, Barter Island, North Slope Alaska
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) active layer that responds variably to...
Authors
Peter W. Swarzenski, Cordell Johnson, Thomas Lorenson, Christopher H. Conaway, Ann E. Gibbs, Li H. Erikson, Bruce M. Richmond, Mark P. Waldrop
Groundwater chemistry in the vicinity of the Puna Geothermal Venture Power Plant, Hawai‘i, after two decades of production Groundwater chemistry in the vicinity of the Puna Geothermal Venture Power Plant, Hawai‘i, after two decades of production
We report chemical data for selected shallow wells and coastal springs that were sampled in 2014 to determine whether geothermal power production in the Puna area over the past two decades has affected the characteristics of regional groundwater. The samples were analyzed for major and minor chemical species, trace metals of environmental concern, stable isotopes of water, and two...
Authors
W.C. Evans, D. Bergfeld, A.J. Sutton, R.C. Lee, T.D. Lorenson
Bacterial dominance in subseafloor sediments characterized by methane hydrates Bacterial dominance in subseafloor sediments characterized by methane hydrates
The degradation of organic carbon in subseafloor sediments on continental margins contributes to the largest reservoir of methane on Earth. Sediments in the Andaman Sea are composed of ~ 1% marine-derived organic carbon and biogenic methane is present. Our objective was to determine microbial abundance and diversity in sediments that transition the gas hydrate occurrence zone (GHOZ) in...
Authors
Brandon R. Briggs, Fumio Inagaki, Yuki Morono, Taiki Futagami, Carme Huguet, Antoni Rosell-Mele, T.D. Lorenson, Frederick S. Colwell
Grain-scale imaging and compositional characterization of cryo-preserved India NGHP 01 gas-hydrate-bearing cores Grain-scale imaging and compositional characterization of cryo-preserved India NGHP 01 gas-hydrate-bearing cores
We report on grain-scale characteristics and gas analyses of gas-hydrate-bearing samples retrieved by NGHP Expedition 01 as part of a large-scale effort to study gas hydrate occurrences off the eastern-Indian Peninsula and along the Andaman convergent margin. Using cryogenic scanning electron microscopy, X-ray spectroscopy, and gas chromatography, we investigated gas hydrate grain...
Authors
Laura A. Stern, T.D. Lorenson
Greenhouse gases generated from the anaerobic biodegradation of natural offshore asphalt seepages in southern California Greenhouse gases generated from the anaerobic biodegradation of natural offshore asphalt seepages in southern California
Significant offshore asphaltic deposits with active seepage occur in the Santa Barbara Channel offshore southern California. The composition and isotopic signatures of gases sampled from the oil and gas seeps reveal that the coexisting oil in the shallow subsurface is anaerobically biodegraded, generating CO2 with secondary CH4 production. Biomineralization can result in the consumption...
Authors
T.D. Lorenson, Florence L. Wong, Peter Dartnell, Ray W. Sliter
Petroleum fingerprinting with organic markers Petroleum fingerprinting with organic markers
Petroleum fingerprinting is an invaluable tool in forensic geochemistry. This article summarizes applications of fingerprinting in several oil spills and natural oil seepages that we have studied during the last 25 years. It shows how each unique chemical fingerprint can be used to correlate or differentiate oils. Fingerprints can provide information about processes in the environment...
Authors
Frances D. Hostettler, T.D. Lorenson, Barbara A. Bekins
Macondo-1 well oil-derived polycyclic aromatic hydrocarbons in mesozooplankton from the northern Gulf of Mexico Macondo-1 well oil-derived polycyclic aromatic hydrocarbons in mesozooplankton from the northern Gulf of Mexico
Mesozooplankton (>200 μm) collected in August and September of 2010 from the northern Gulf of Mexico show evidence of exposure to polycyclic aromatic hydrocarbons (PAHs). Multivariate statistical analysis revealed that distributions of PAHs extracted from mesozooplankton were related to the oil released from the ruptured British Petroleum Macondo-1 (M-1) well associated with the R...
Authors
Siddhartha Mitra, David G. Kimmel, Jessica Snyder, Kimberly Scalise, Benjamin D. McGlaughon, Michael R. Roman, Ginger L. Jahn, James J. Pierson, Stephen B. Brandt, Joseph P. Montoya, Robert J. Rosenbauer, T.D. Lorenson, Florence L. Wong, Pamela L. Campbell
A petroleum system model for gas hydrate deposits in northern Alaska A petroleum system model for gas hydrate deposits in northern Alaska
Gas hydrate deposits are common on the North Slope of Alaska around Prudhoe Bay, however the extent of these deposits is unknown outside of this area. As part of a United States Geological Survey (USGS) and the Bureau of Land Management (BLM) gas hydrate research collaboration, well cutting and mud gas samples have been collected and analyzed from mainly industry-drilled wells on the...
Authors
T.D. Lorenson, Timothy S. Collett, Florence L. Wong
Beaufort Sea deep-water gas hydrate recovery from a seafloor mound in a region of widespread BSR occurrence Beaufort Sea deep-water gas hydrate recovery from a seafloor mound in a region of widespread BSR occurrence
Gas hydrate was recovered from the Alaskan Beaufort Sea slope north of Camden Bay in August 2010 during a U.S. Coast Guard Cutter Healy expedition (USCG cruise ID HLY1002) under the direction of the U.S. Geological Survey (USGS). Interpretation of multichannel seismic (MCS) reflection data collected in 1977 by the USGS across the Beaufort Sea continental margin identified a regional...
Authors
Patrick E. Hart, John W. Pohlman, T.D. Lorenson, Brian D. Edwards
Science and Products
Filter Total Items: 14
Permafrost Mapping in Two Wetland Systems North of the Tanana River in Interior Alaska 2014 Permafrost Mapping in Two Wetland Systems North of the Tanana River in Interior Alaska 2014
Surface-based 2D electrical resistivity tomography (ERT) surveys were used to investigate the distribution of permafrost 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 contained habitat types characteristic of interior Alaska, including thermokarst bog, forested permafrost plateau, and a rich...
Geochemical analysis of seeps along the Queen Charlotte Fault Geochemical analysis of seeps along the Queen Charlotte Fault
Geochemical analyses of authigenic carbonates, bivalves, and pore fluids were performed on samples collected from seep fields along the Queen Charlotte Fault, a right lateral transform boundary that separates the Pacific and North American tectonic plates. Samples were collected using grab samplers and piston cores, and were collected during three different research cruises in 2011, 2015...
Filter Total Items: 49
National Gas Hydrate Program Expedition 01 offshore India; gas hydrate systems as revealed by hydrocarbon gas geochemistry National Gas Hydrate Program Expedition 01 offshore India; gas hydrate systems as revealed by hydrocarbon gas geochemistry
The National Gas Hydrate Program Expedition 01 (NGHP-01) targeted gas hydrate accumulations offshore of the Indian Peninsula and along the Andaman convergent margin. The primary objectives of coring were to understand the geologic and geochemical controls on the accumulation of methane hydrate and their linkages to underlying petroleum systems. Four areas were investigated: 1) the Kerala...
Authors
Thomas Lorenson, Timothy S. Collett
A new model for turbidity current behavior based on integration of flow monitoring and precision coring in a submarine canyon A new model for turbidity current behavior based on integration of flow monitoring and precision coring in a submarine canyon
Submarine turbidity currents create some of the largest sediment accumulations on Earth, yet there are few direct measurements of these flows. Instead, most of our understanding of turbidity currents results from analyzing their deposits in the sedimentary record. However, the lack of direct flow measurements means that there is considerable debate regarding how to interpret flow...
Authors
William O. Symons, Esther J. Sumner, Charles K. Paull, Matthieu J.B. Cartigny, Jingping Xu, Katherine L. Maier, Thomas Lorenson, Peter J. Talling
Dissolved methane in the Beaufort Sea and the Arctic Ocean, 1992-2009; sources and atmospheric flux Dissolved methane in the Beaufort Sea and the Arctic Ocean, 1992-2009; sources and atmospheric flux
Methane concentration and isotopic composition was measured in ice-covered and ice-free waters of the Arctic Ocean during eleven surveys spanning the years of 1992-1995 and 2009. During ice-free periods, methane flux from the Beaufort shelf varies from 0.14 to 0.43 mg CH4 m-2 day-1. Maximum fluxes from localized areas of high methane concentration are up to 1.52 mg CH4 m-2 day-1...
Authors
Thomas D. Lorenson, Jens Greinert, Richard B. Coffin
Seasonal electrical resistivity surveys of a coastal bluff, Barter Island, North Slope Alaska Seasonal electrical resistivity surveys of a coastal bluff, Barter Island, North Slope Alaska
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) active layer that responds variably to...
Authors
Peter W. Swarzenski, Cordell Johnson, Thomas Lorenson, Christopher H. Conaway, Ann E. Gibbs, Li H. Erikson, Bruce M. Richmond, Mark P. Waldrop
Groundwater chemistry in the vicinity of the Puna Geothermal Venture Power Plant, Hawai‘i, after two decades of production Groundwater chemistry in the vicinity of the Puna Geothermal Venture Power Plant, Hawai‘i, after two decades of production
We report chemical data for selected shallow wells and coastal springs that were sampled in 2014 to determine whether geothermal power production in the Puna area over the past two decades has affected the characteristics of regional groundwater. The samples were analyzed for major and minor chemical species, trace metals of environmental concern, stable isotopes of water, and two...
Authors
W.C. Evans, D. Bergfeld, A.J. Sutton, R.C. Lee, T.D. Lorenson
Bacterial dominance in subseafloor sediments characterized by methane hydrates Bacterial dominance in subseafloor sediments characterized by methane hydrates
The degradation of organic carbon in subseafloor sediments on continental margins contributes to the largest reservoir of methane on Earth. Sediments in the Andaman Sea are composed of ~ 1% marine-derived organic carbon and biogenic methane is present. Our objective was to determine microbial abundance and diversity in sediments that transition the gas hydrate occurrence zone (GHOZ) in...
Authors
Brandon R. Briggs, Fumio Inagaki, Yuki Morono, Taiki Futagami, Carme Huguet, Antoni Rosell-Mele, T.D. Lorenson, Frederick S. Colwell
Grain-scale imaging and compositional characterization of cryo-preserved India NGHP 01 gas-hydrate-bearing cores Grain-scale imaging and compositional characterization of cryo-preserved India NGHP 01 gas-hydrate-bearing cores
We report on grain-scale characteristics and gas analyses of gas-hydrate-bearing samples retrieved by NGHP Expedition 01 as part of a large-scale effort to study gas hydrate occurrences off the eastern-Indian Peninsula and along the Andaman convergent margin. Using cryogenic scanning electron microscopy, X-ray spectroscopy, and gas chromatography, we investigated gas hydrate grain...
Authors
Laura A. Stern, T.D. Lorenson
Greenhouse gases generated from the anaerobic biodegradation of natural offshore asphalt seepages in southern California Greenhouse gases generated from the anaerobic biodegradation of natural offshore asphalt seepages in southern California
Significant offshore asphaltic deposits with active seepage occur in the Santa Barbara Channel offshore southern California. The composition and isotopic signatures of gases sampled from the oil and gas seeps reveal that the coexisting oil in the shallow subsurface is anaerobically biodegraded, generating CO2 with secondary CH4 production. Biomineralization can result in the consumption...
Authors
T.D. Lorenson, Florence L. Wong, Peter Dartnell, Ray W. Sliter
Petroleum fingerprinting with organic markers Petroleum fingerprinting with organic markers
Petroleum fingerprinting is an invaluable tool in forensic geochemistry. This article summarizes applications of fingerprinting in several oil spills and natural oil seepages that we have studied during the last 25 years. It shows how each unique chemical fingerprint can be used to correlate or differentiate oils. Fingerprints can provide information about processes in the environment...
Authors
Frances D. Hostettler, T.D. Lorenson, Barbara A. Bekins
Macondo-1 well oil-derived polycyclic aromatic hydrocarbons in mesozooplankton from the northern Gulf of Mexico Macondo-1 well oil-derived polycyclic aromatic hydrocarbons in mesozooplankton from the northern Gulf of Mexico
Mesozooplankton (>200 μm) collected in August and September of 2010 from the northern Gulf of Mexico show evidence of exposure to polycyclic aromatic hydrocarbons (PAHs). Multivariate statistical analysis revealed that distributions of PAHs extracted from mesozooplankton were related to the oil released from the ruptured British Petroleum Macondo-1 (M-1) well associated with the R...
Authors
Siddhartha Mitra, David G. Kimmel, Jessica Snyder, Kimberly Scalise, Benjamin D. McGlaughon, Michael R. Roman, Ginger L. Jahn, James J. Pierson, Stephen B. Brandt, Joseph P. Montoya, Robert J. Rosenbauer, T.D. Lorenson, Florence L. Wong, Pamela L. Campbell
A petroleum system model for gas hydrate deposits in northern Alaska A petroleum system model for gas hydrate deposits in northern Alaska
Gas hydrate deposits are common on the North Slope of Alaska around Prudhoe Bay, however the extent of these deposits is unknown outside of this area. As part of a United States Geological Survey (USGS) and the Bureau of Land Management (BLM) gas hydrate research collaboration, well cutting and mud gas samples have been collected and analyzed from mainly industry-drilled wells on the...
Authors
T.D. Lorenson, Timothy S. Collett, Florence L. Wong
Beaufort Sea deep-water gas hydrate recovery from a seafloor mound in a region of widespread BSR occurrence Beaufort Sea deep-water gas hydrate recovery from a seafloor mound in a region of widespread BSR occurrence
Gas hydrate was recovered from the Alaskan Beaufort Sea slope north of Camden Bay in August 2010 during a U.S. Coast Guard Cutter Healy expedition (USCG cruise ID HLY1002) under the direction of the U.S. Geological Survey (USGS). Interpretation of multichannel seismic (MCS) reflection data collected in 1977 by the USGS across the Beaufort Sea continental margin identified a regional...
Authors
Patrick E. Hart, John W. Pohlman, T.D. Lorenson, Brian D. Edwards