The U.S. Atlantic continental margin was one of the first locations where researchers recognized bottom simulating reflections, seismic features that are generally interpreted as marking the base of the gas hydrate stability zone in marine sediments. Geophysical cruises and ocean drilling in the 1990s provided insight into the Blake Ridge gas hydrate province. In the past decade, hundreds of seafloor methane seeps have been discovered on this margin between Cape Hatteras and Georges Bank. The USGS has conducted many cruises to image water column methane plumes, support geochemical and benthic ecology studies related to the methane seeps, and constrain the distribution of gas hydrates between Cape Hatteras and southern New England.
Sound Waves Articles
USGS images gas hydrates with 2000 km of new seismic data on U.S. Atlantic margin
Real-time public engagement in deep-water remotely operated vehicle dives at methane seeps
Fire in the Ice Articles
U.S. Mid-Atlantic resource imaging experiment (MATRIX) constrains gas hydrate distribution
Exploring U.S. Atlantic margin seeps with a remotely-operated vehicle,
Carolyn Ruppel's data releases associated with U.S. Atlantic Margin Gas Hydrates and Methane Seeps project.
Geochemical analysis of authigenic carbonates and chemosynthetic mussels at Atlantic Margin seeps
Isotopic analyses of authigenic carbonates and methanotrophic deep-sea mussels, Bathymodiolus sp., was performed on samples collected from seep fields in the Baltimore and Norfolk Canyons on the north Atlantic margin. Samples were collected using remotely operated underwater vehicles (ROVs) during three different research cruises in 2012, 2013, and 2015. Analyses were performed by several differen
Carolyn Ruppel's publications associated with U.S. Atlantic Margin Gas Hydrates and Methane Seeps project.
Surface methane concentrations along the mid-Atlantic bight driven by aerobic subsurface production rather than seafloor gas seeps
Relatively minor amounts of methane, a potent greenhouse gas, are currently emitted from the oceans to the atmosphere, but such methane emissions have been hypothesized to increase as oceans warm. Here, we investigate the source, distribution, and fate of methane released from the upper continental slope of the U.S. Mid-Atlantic Bight, where hundreds of gas seeps have been discovered between the
Authors
Mihai Leonte, Carolyn D. Ruppel, Angel Ruiz-Angelo, John D. Kessler
Filter Total Items: 13
Estimating the impact of seep methane oxidation on ocean pH and dissolved inorganic radiocarbon along the U.S. mid‐Atlantic Bight
Ongoing ocean warming can release methane (CH4) currently stored in ocean sediments as free gas and gas hydrates. Once dissolved in ocean waters, this CH4 can be oxidized to carbon dioxide (CO2). While it has been hypothesized that the CO2 produced from aerobic CH4 oxidation could enhance ocean acidification, a previous study conducted in Hudson Canyon shows that CH4 oxidation has a small short‐te
Authors
Fenix Garcia-Tigreros, Mihai Leonte, Carolyn D. Ruppel, Angel Ruiz-Angulo, DoongJoo Joung, Benjamin Young, John D. Kessler
Timescales and processes of methane hydrate formation and breakdown, with application to geologic systems
Gas hydrate is an ice-like form of water and low molecular weight gas stable at temperatures of roughly -10ºC to 25ºC and pressures of ~3 to 30 MPa in geologic systems. Natural gas hydrates sequester an estimated one-sixth of Earth’s methane and are found primarily in deepwater marine sediments on continental margins, but also in permafrost areas and under continental ice sheets. When gas hydrate
Authors
Carolyn D. Ruppel, William F. Waite
Examination of Bathymodiolus childressi nutritional sources, isotopic niches, and food-web linkages at two seeps in the US Atlantic margin using stable isotope analysis and mixing models
Chemosynthetic environments support distinct benthic communities capable of utilizing reduced chemical compounds for nutrition. Hundreds of methane seeps have been documented along the U.S. Atlantic margin (USAM), and detailed investigations at a few seeps have revealed distinct environments containing mussels, microbial mats, authigenic carbonates, and soft sediments. The dominant mussel, Bathymo
Authors
Amanda Demopoulos, Jennifer McClain Counts, Jill Bourque, Nancy Prouty, Brian Smith, Sandra Brooke, Steve W. Ross, Carolyn Ruppel
Determining the flux of methane into Hudson Canyon at the edge of methane clathrate hydrate stability
Methane seeps were investigated in Hudson Canyon, the largest shelf-break canyon on the northern US Atlantic Margin. The seeps investigated are located at or updip of the nominal limit of methane clathrate hydrate stability. The acoustic identification of bubble streams was used to guide water column sampling in a 32 km2 region within the canyon's thalweg. By incorporating measurements of dissolve
Authors
A. Weinsten, L Navarrete, Carolyn D. Ruppel, T.C. Weber, M. Leonte, M. Kellermann, E. Arrington, D.L. Valentine, M.L Scranton, John D. Kessler
Insights into methane dynamics from analysis of authigenic carbonates and chemosynthetic mussels at newly-discovered Atlantic Margin seeps
The recent discovery of active methane venting along the US northern and mid-Atlantic margin represents a new source of global methane not previously accounted for in carbon budgets from this region. However, uncertainty remains as to the origin and history of methane seepage along this tectonically inactive passive margin. Here we present the first isotopic analyses of authigenic carbonates and m
Authors
Nancy G. Prouty, Diana Sahy, Carolyn D. Ruppel, E. Brendan Roark, Dan Condon, Sandra Brooke, Steve W. Ross, Amanda W.J. Demopoulos
Exploration of the canyon-incised continental margin of the northeastern United States reveals dynamic habitats and diverse communities
The continental margin off the northeastern United States (NEUS) contains numerous, topographically complex features that increase habitat heterogeneity across the region. However, the majority of these rugged features have never been surveyed, particularly using direct observations. During summer 2013, 31 Remotely-Operated Vehicle (ROV) dives were conducted from 494 to 3271 m depth across a varie
Authors
Andrea Quattrini, Martha S. Nizinski, Jason Chaytor, Amanda W.J. Demopoulos, E. Brendan Roark, Scott France, Jon A. Moore, Taylor P. Heyl, Peter J. Auster, Carolyn D. Ruppel, Kelley P. Elliott, Brian R. C. Kennedy, Elizabeth A. Lobecker, Adam Skarke, Timothy M. Shank
Preface to the special issue on gas hydrate drilling in the Eastern Nankai Trough
Methane hydrate traps enormous amounts of methane in frozen deposits in continental margin sediments, and these deposits have long been targeted for studies investigating their potential as an energy resource. As a concentrated form of methane that occurs at shallower depths than conventional and most unconventional gas reservoirs, methane hydrates could be a readily accessible source of hydrocarb
Authors
Koji Yamamoto, Carolyn D. Ruppel
Widespread methane leakage from the sea floor on the northern US Atlantic margin
Methane emissions from the sea floor affect methane inputs into the atmosphere, ocean acidification and de-oxygenation, the distribution of chemosynthetic communities and energy resources. Global methane flux from seabed cold seeps has only been estimated for continental shelves, at 8 to 65 Tg CH4 yr−1, yet other parts of marine continental margins are also emitting methane. The US Atlantic margin
Authors
Adam Skarke, Carolyn Ruppel, Mali'o Kodis, Daniel S. Brothers, Elizabeth A. Lobecker
Seabed fluid expulsion along the upper slope and outer shelf of the U.S. Atlantic continental margin
Identifying the spatial distribution of seabed fluid expulsion features is crucial for understanding the substrate plumbing system of any continental margin. A 1100 km stretch of the U.S. Atlantic margin contains more than 5000 pockmarks at water depths of 120 m (shelf edge) to 700 m (upper slope), mostly updip of the contemporary gas hydrate stability zone (GHSZ). Advanced attribute analyses of h
Authors
D.S. Brothers, C. Ruppel, J.W. Kluesner, Uri S. ten Brink, J.D. Chaytor, J. C. Hill, B.D. Andrews, C. Flores
Evidence for extensive methane venting on the southeastern U.S. Atlantic margin
We present the first evidence for widespread seabed methane venting along the southeastern United States Atlantic margin beyond the well-known Blake Ridge diapir seep. Recent ship- and autonomous underwater vehicle (AUV)–collected data resolve multiple water-column anomalies (>1000 m height) and extensive new chemosynthetic seep communities at the Blake Ridge and Cape Fear diapirs. These results i
Authors
L.L. Brothers, C.L. Van Dover, C.R. German, C.L. Kaiser, D.R. Yoerger, C.D. Ruppel, E. Lobecker, A.D. Skarke, J.K.S. Wagner
Triggering mechanism and tsunamogenic potential of the Cape Fear Slide complex, U.S. Atlantic margin
Analysis of new multibeam bathymetry data and seismic Chirp data acquired over the Cape Fear Slide complex on the U.S. Atlantic margin suggests that at least 5 major submarine slides have likely occurred there within the past 30,000 years, indicating that repetitive, large-scale mass wasting and associated tsunamis may be more common in this area than previously believed. Gas hydrate deposits and
Authors
Matthew J. Hornbach, Luc L. Lavier, Carolyn D. Ruppel
Three-dimensional structure of fluid conduits sustaining an active deep marine cold seep
Cold seeps in deep marine settings emit fluids to the overlying ocean and are often associated with such seafloor flux indicators as chemosynthetic biota, pockmarks, and authigenic carbonate rocks. Despite evidence for spatiotemporal variability in the rate, locus, and composition of cold seep fluid emissions, the shallow subseafloor plumbing systems have never been clearly imaged in three dimensi
Authors
M.J. Hornbach, C. Ruppel, C.L. Van Dover
- Overview
The U.S. Atlantic continental margin was one of the first locations where researchers recognized bottom simulating reflections, seismic features that are generally interpreted as marking the base of the gas hydrate stability zone in marine sediments. Geophysical cruises and ocean drilling in the 1990s provided insight into the Blake Ridge gas hydrate province. In the past decade, hundreds of seafloor methane seeps have been discovered on this margin between Cape Hatteras and Georges Bank. The USGS has conducted many cruises to image water column methane plumes, support geochemical and benthic ecology studies related to the methane seeps, and constrain the distribution of gas hydrates between Cape Hatteras and southern New England.
Sound Waves Articles
USGS images gas hydrates with 2000 km of new seismic data on U.S. Atlantic margin
Real-time public engagement in deep-water remotely operated vehicle dives at methane seeps
Fire in the Ice Articles
U.S. Mid-Atlantic resource imaging experiment (MATRIX) constrains gas hydrate distribution
Exploring U.S. Atlantic margin seeps with a remotely-operated vehicle,
- Data
Carolyn Ruppel's data releases associated with U.S. Atlantic Margin Gas Hydrates and Methane Seeps project.
Geochemical analysis of authigenic carbonates and chemosynthetic mussels at Atlantic Margin seeps
Isotopic analyses of authigenic carbonates and methanotrophic deep-sea mussels, Bathymodiolus sp., was performed on samples collected from seep fields in the Baltimore and Norfolk Canyons on the north Atlantic margin. Samples were collected using remotely operated underwater vehicles (ROVs) during three different research cruises in 2012, 2013, and 2015. Analyses were performed by several differen - Publications
Carolyn Ruppel's publications associated with U.S. Atlantic Margin Gas Hydrates and Methane Seeps project.
Surface methane concentrations along the mid-Atlantic bight driven by aerobic subsurface production rather than seafloor gas seeps
Relatively minor amounts of methane, a potent greenhouse gas, are currently emitted from the oceans to the atmosphere, but such methane emissions have been hypothesized to increase as oceans warm. Here, we investigate the source, distribution, and fate of methane released from the upper continental slope of the U.S. Mid-Atlantic Bight, where hundreds of gas seeps have been discovered between theAuthorsMihai Leonte, Carolyn D. Ruppel, Angel Ruiz-Angelo, John D. KesslerFilter Total Items: 13Estimating the impact of seep methane oxidation on ocean pH and dissolved inorganic radiocarbon along the U.S. mid‐Atlantic Bight
Ongoing ocean warming can release methane (CH4) currently stored in ocean sediments as free gas and gas hydrates. Once dissolved in ocean waters, this CH4 can be oxidized to carbon dioxide (CO2). While it has been hypothesized that the CO2 produced from aerobic CH4 oxidation could enhance ocean acidification, a previous study conducted in Hudson Canyon shows that CH4 oxidation has a small short‐teAuthorsFenix Garcia-Tigreros, Mihai Leonte, Carolyn D. Ruppel, Angel Ruiz-Angulo, DoongJoo Joung, Benjamin Young, John D. KesslerTimescales and processes of methane hydrate formation and breakdown, with application to geologic systems
Gas hydrate is an ice-like form of water and low molecular weight gas stable at temperatures of roughly -10ºC to 25ºC and pressures of ~3 to 30 MPa in geologic systems. Natural gas hydrates sequester an estimated one-sixth of Earth’s methane and are found primarily in deepwater marine sediments on continental margins, but also in permafrost areas and under continental ice sheets. When gas hydrateAuthorsCarolyn D. Ruppel, William F. WaiteExamination of Bathymodiolus childressi nutritional sources, isotopic niches, and food-web linkages at two seeps in the US Atlantic margin using stable isotope analysis and mixing models
Chemosynthetic environments support distinct benthic communities capable of utilizing reduced chemical compounds for nutrition. Hundreds of methane seeps have been documented along the U.S. Atlantic margin (USAM), and detailed investigations at a few seeps have revealed distinct environments containing mussels, microbial mats, authigenic carbonates, and soft sediments. The dominant mussel, BathymoAuthorsAmanda Demopoulos, Jennifer McClain Counts, Jill Bourque, Nancy Prouty, Brian Smith, Sandra Brooke, Steve W. Ross, Carolyn RuppelDetermining the flux of methane into Hudson Canyon at the edge of methane clathrate hydrate stability
Methane seeps were investigated in Hudson Canyon, the largest shelf-break canyon on the northern US Atlantic Margin. The seeps investigated are located at or updip of the nominal limit of methane clathrate hydrate stability. The acoustic identification of bubble streams was used to guide water column sampling in a 32 km2 region within the canyon's thalweg. By incorporating measurements of dissolveAuthorsA. Weinsten, L Navarrete, Carolyn D. Ruppel, T.C. Weber, M. Leonte, M. Kellermann, E. Arrington, D.L. Valentine, M.L Scranton, John D. KesslerInsights into methane dynamics from analysis of authigenic carbonates and chemosynthetic mussels at newly-discovered Atlantic Margin seeps
The recent discovery of active methane venting along the US northern and mid-Atlantic margin represents a new source of global methane not previously accounted for in carbon budgets from this region. However, uncertainty remains as to the origin and history of methane seepage along this tectonically inactive passive margin. Here we present the first isotopic analyses of authigenic carbonates and mAuthorsNancy G. Prouty, Diana Sahy, Carolyn D. Ruppel, E. Brendan Roark, Dan Condon, Sandra Brooke, Steve W. Ross, Amanda W.J. DemopoulosExploration of the canyon-incised continental margin of the northeastern United States reveals dynamic habitats and diverse communities
The continental margin off the northeastern United States (NEUS) contains numerous, topographically complex features that increase habitat heterogeneity across the region. However, the majority of these rugged features have never been surveyed, particularly using direct observations. During summer 2013, 31 Remotely-Operated Vehicle (ROV) dives were conducted from 494 to 3271 m depth across a varieAuthorsAndrea Quattrini, Martha S. Nizinski, Jason Chaytor, Amanda W.J. Demopoulos, E. Brendan Roark, Scott France, Jon A. Moore, Taylor P. Heyl, Peter J. Auster, Carolyn D. Ruppel, Kelley P. Elliott, Brian R. C. Kennedy, Elizabeth A. Lobecker, Adam Skarke, Timothy M. ShankPreface to the special issue on gas hydrate drilling in the Eastern Nankai Trough
Methane hydrate traps enormous amounts of methane in frozen deposits in continental margin sediments, and these deposits have long been targeted for studies investigating their potential as an energy resource. As a concentrated form of methane that occurs at shallower depths than conventional and most unconventional gas reservoirs, methane hydrates could be a readily accessible source of hydrocarbAuthorsKoji Yamamoto, Carolyn D. RuppelWidespread methane leakage from the sea floor on the northern US Atlantic margin
Methane emissions from the sea floor affect methane inputs into the atmosphere, ocean acidification and de-oxygenation, the distribution of chemosynthetic communities and energy resources. Global methane flux from seabed cold seeps has only been estimated for continental shelves, at 8 to 65 Tg CH4 yr−1, yet other parts of marine continental margins are also emitting methane. The US Atlantic marginAuthorsAdam Skarke, Carolyn Ruppel, Mali'o Kodis, Daniel S. Brothers, Elizabeth A. LobeckerSeabed fluid expulsion along the upper slope and outer shelf of the U.S. Atlantic continental margin
Identifying the spatial distribution of seabed fluid expulsion features is crucial for understanding the substrate plumbing system of any continental margin. A 1100 km stretch of the U.S. Atlantic margin contains more than 5000 pockmarks at water depths of 120 m (shelf edge) to 700 m (upper slope), mostly updip of the contemporary gas hydrate stability zone (GHSZ). Advanced attribute analyses of hAuthorsD.S. Brothers, C. Ruppel, J.W. Kluesner, Uri S. ten Brink, J.D. Chaytor, J. C. Hill, B.D. Andrews, C. FloresEvidence for extensive methane venting on the southeastern U.S. Atlantic margin
We present the first evidence for widespread seabed methane venting along the southeastern United States Atlantic margin beyond the well-known Blake Ridge diapir seep. Recent ship- and autonomous underwater vehicle (AUV)–collected data resolve multiple water-column anomalies (>1000 m height) and extensive new chemosynthetic seep communities at the Blake Ridge and Cape Fear diapirs. These results iAuthorsL.L. Brothers, C.L. Van Dover, C.R. German, C.L. Kaiser, D.R. Yoerger, C.D. Ruppel, E. Lobecker, A.D. Skarke, J.K.S. WagnerTriggering mechanism and tsunamogenic potential of the Cape Fear Slide complex, U.S. Atlantic margin
Analysis of new multibeam bathymetry data and seismic Chirp data acquired over the Cape Fear Slide complex on the U.S. Atlantic margin suggests that at least 5 major submarine slides have likely occurred there within the past 30,000 years, indicating that repetitive, large-scale mass wasting and associated tsunamis may be more common in this area than previously believed. Gas hydrate deposits andAuthorsMatthew J. Hornbach, Luc L. Lavier, Carolyn D. RuppelThree-dimensional structure of fluid conduits sustaining an active deep marine cold seep
Cold seeps in deep marine settings emit fluids to the overlying ocean and are often associated with such seafloor flux indicators as chemosynthetic biota, pockmarks, and authigenic carbonate rocks. Despite evidence for spatiotemporal variability in the rate, locus, and composition of cold seep fluid emissions, the shallow subseafloor plumbing systems have never been clearly imaged in three dimensiAuthorsM.J. Hornbach, C. Ruppel, C.L. Van Dover