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Filter Total Items: 1739
Global and local sources of mercury deposition in coastal New England reconstructed from a multi-proxy, high-resolution, estuarine sediment record Global and local sources of mercury deposition in coastal New England reconstructed from a multi-proxy, high-resolution, estuarine sediment record
Historical reconstruction of mercury (Hg) accumulation in natural archives, especially lake sediments, has been essential to understanding human perturbation of the global Hg cycle. Here we present a high-resolution chronology of Hg accumulation between 1727 and 1996 in a varved sediment core from the Pettaquamscutt River Estuary (PRE), Rhode Island. Mercury accumulation is examined...
Authors
William. F Fitzgerald, Daniel R Engstrom, Chad Hammerschmidt, Carl Lamborg, Prentiss Balcom, Ana Lima-Braun, Michael H. Bothner, Christopher M. Reddy
Canada Basin Canada Basin
Perennial sea-ice cover over much of Canada Basin of the Arctic Ocean has hampered geoscientific studies, but concerted efforts over the past decade– particularly with the use of two ice-breakers working collaboratively – has led to new seismic and sample acquisitions. These studies have revealed extensive non-oceanic basement beneath Canada Basin that coincides with proof of a central...
Authors
David Mosher, Deborah Hutchinson
Storm impacts on hydrodynamics and suspended-sediment fluxes in a microtidal back-barrier estuary Storm impacts on hydrodynamics and suspended-sediment fluxes in a microtidal back-barrier estuary
Recent major storms have piqued interest in understanding the responses of estuarine hydrodynamics and sediment transport to these events. To that end, flow velocity, wave characteristics, and suspended-sediment concentration (SSC) were measured for 11 months at eight locations in Chincoteague Bay, MD/VA, USA, a shallow back-barrier estuary. Daily breezes and episodic storms generated...
Authors
Daniel J. Nowacki, Neil K. Ganju
Remotely sensing the morphometrics and dynamics of a cold region dune field using historical aerial photography and airborne LiDAR data Remotely sensing the morphometrics and dynamics of a cold region dune field using historical aerial photography and airborne LiDAR data
This study uses an airborne Light Detection and Ranging (LiDAR) survey, historical aerial photography and historical climate data to describe the character and dynamics of the Nogahabara Sand Dunes, a sub-Arctic dune field in interior Alaska’s discontinuous permafrost zone. The Nogahabara Sand Dunes consist of a 43-km2 area of active transverse and barchanoid dunes within a 3200-km2 area...
Authors
Carson Baughman, Benjamin M. Jones, Karin L. Bodony, Daniel H. Mann, Christopher F. Larsen, Emily A. Himmelstoss, Jeremy Smith
Downhole physical property-based description of a gas hydrate petroleum system in NGHP-02 Area C: A channel, levee, fan complex in the Krishna-Godavari Basin offshore eastern India Downhole physical property-based description of a gas hydrate petroleum system in NGHP-02 Area C: A channel, levee, fan complex in the Krishna-Godavari Basin offshore eastern India
India’s second National Gas Hydrate Program expedition, NGHP-02, collected logging while drilling and sediment core data in Area C offshore eastern India, to investigate controls on the distribution and peak saturations of methane gas hydrate occurrences in buried channel, levee and fan deposits. Physical property results are presented here for the four Area C coring sites: NGHP-02-07...
Authors
William F. Waite, Junbong Jang, Timothy S. Collett, Ronish Kumar
Slope failure and mass transport processes along the Queen Charlotte Fault, southeastern Alaska Slope failure and mass transport processes along the Queen Charlotte Fault, southeastern Alaska
The Queen Charlotte Fault defines the Pacific–North America transform plate boundary in western Canada and southeastern Alaska for c. 900 km. The entire length of the fault is submerged along a continental margin dominated by Quaternary glacial processes, yet the geomorphology along the margin has never been systematically examined due to the absence of high-resolution seafloor mapping...
Authors
Daniel Brothers, Brian D. Andrews, Maureen A. L. Walton, H. Gary Greene, J. Vaughn Barrie, Nathaniel C. Miller, Uri S. ten Brink, Amy E. East, Peter J. Haeussler, Jared W. Kluesner, James E. Conrad
Cohesive and mixed sediment in the Regional Ocean Modeling System (ROMS v3.6) implemented in the Coupled Ocean–Atmosphere–Wave–Sediment Transport Modeling System (COAWST r1234) Cohesive and mixed sediment in the Regional Ocean Modeling System (ROMS v3.6) implemented in the Coupled Ocean–Atmosphere–Wave–Sediment Transport Modeling System (COAWST r1234)
No abstract available.
Authors
Christopher R. Sherwood, Alfredo Aretxabaleta, Courtney K. Harris, J. Paul Rinehimer, Romaric Verney, Benedicte Ferre
Deformation of the Pacific/North America plate boundary at Queen Charlotte Fault: The possible role of rheology Deformation of the Pacific/North America plate boundary at Queen Charlotte Fault: The possible role of rheology
The Pacific/North America (PA/NA) plate boundary between Vancouver Island and Alaska is similar to the PA/NA boundary in California in its kinematic history and the rate and azimuth of current relative motion, yet their deformation styles are distinct. The California plate boundary shows a broad zone of parallel strike slip and thrust faults and folds, whereas the 49‐mm/yr PA/NA relative...
Authors
Uri S. ten Brink, Nathaniel C. Miller, Brian D. Andrews, Daniel S. Brothers, Peter J. Haeussler
Direct measurements of mean Reynolds stress and ripple roughness in the presence of energetic forcing by surface waves Direct measurements of mean Reynolds stress and ripple roughness in the presence of energetic forcing by surface waves
Direct covariance observations of the mean flow Reynolds stress and sonar images of the seafloor collected on a wave‐exposed inner continental shelf demonstrate that the drag exerted by the seabed on the overlying flow is consistent with boundary layer models for wave‐current interaction, provided that the orientation and anisotropy of the bed roughness are appropriately quantified...
Authors
Malcolm Scully, John Trowbridge, Christopher R. Sherwood, Katie R. Jones, Peter A. Traykovski
A consistent global approach for the morphometric characterization of subaqueous landslides A consistent global approach for the morphometric characterization of subaqueous landslides
Landslides are common in aquatic settings worldwide, from lakes and coastal environments to the deep sea. Fast-moving, large-volume landslides can potentially trigger destructive tsunamis. Landslides damage and disrupt global communication links and other critical marine infrastructure. Landslide deposits act as foci for localized, but important, deep-seafloor biological communities...
Authors
Michael Clare, Jason Chaytor, Oliver Dabson, Davide Gamboa, Aggeliki Georgiopoulou, Harry Eady, James Hunt, Christopher Jackson, Oded Katz, Sebastian Krastel, Ricardo Leon, Aaron Micallef, Jasper Moernaut, Roberto Moriconi, Lorena Moscardelli, Christof Mueller, Alexandre Normandeau, Marco Patacci, Michael Steventon, Morelia Urlaub, David Volker, Lesli Wood, Zane R. Jobe
Archie’s saturation exponent for natural gas hydrate in coarse-grained reservoirs Archie’s saturation exponent for natural gas hydrate in coarse-grained reservoirs
Accurately quantifying the amount of naturally occurring gas hydrate in marine and permafrost environments is important for assessing its resource potential and understanding the role of gas hydrate in the global carbon cycle. Electrical resistivity well logs are often used to calculate gas hydrate saturations, Sh, using Archie's equation. Archie's equation, in turn, relies on an...
Authors
Ann E. Cook, William F. Waite
Carbon budget of tidal wetlands, estuaries, and shelf waters of eastern North America Carbon budget of tidal wetlands, estuaries, and shelf waters of eastern North America
Carbon cycling in the coastal zone affects global carbon budgets and is critical for understanding the urgent issues of hypoxia, acidification, and tidal wetland loss. However, there are no regional carbon budgets spanning the three main ecosystems in coastal waters: tidal wetlands, estuaries, and shelf waters. Here we construct such a budget for eastern North America using historical...
Authors
R.G. Najjar, M. Herrmann, Richard B. Alexander, E.W. Boyer, D. J. Burdige, D. Butman, W.-J. Cai, E.A. Canuel, R.F. Chen, M. A. M. Friedrichs, R.A. Feagin, P. C. Griffith, A.L. Hinson, J.R. Holmquist, X. Hu, W.M. Kemp, Kevin D. Kroeger, A. Mannino, S.L. McCallister, W.R. McGillis, M.R. Mulholland, C. H. Pilskaln, J. Salisbury, S. R. Signorini, P. St. Laurent, H. Tian, M Tzortziou, P. Vlahos, Zhanming Wan, R. C. Zimmerman