Index Catalog // ScholarsArchive@OSU

Large-Scale Forcing of the Agulhas Variability: The Seasonal Cycle

Creator:: Matano, R. P., Beier, E. J., Strub, P. T., and Tokmakian, R.
Abstract:: In this article the authors examine the kinematics and dynamics of the seasonal cycle in the western Indian Ocean in an eddy-permitting global simulation [Parallel Ocean Circulation Model, model run 4C (POCM-4C)]. Seasonal changes of the transport of the Agulhas Current are linked to the large-scale circulation in the tropical...
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Full Text:: the Agulhas Variability: The Seasonal Cycle R. P. MATANO, E. J. BEIER, AND P. T. STRUB College of

A Modeling Study of Eulerian and Lagrangian Aspects of Shelf Circulation off Duck, North Carolina

Creator:: Kuebel Cervantes, B. T., Allen, J. S., and Samelson, R. M.
Abstract:: The effects of wind-forced upwelling and downwelling on the continental shelf off Duck, North Carolina, are studied through experiments with a two-dimensional numerical primitive equation model. Moored and shipboard measurements obtained during August–November 1994 as part of the Coastal Ocean Processes (CoOP) Inner Shelf Study (ISS) are used for model–data...
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Full Text:: Lagrangian Aspects of Shelf Circulation off Duck, North Carolina B. T. KUEBEL CERVANTES, J. S. ALLEN, AND R

Absolute humidity and the seasonal onset of influenza in the continental United States

Creator:: Shaman, Jeffrey, Pitzer, Virginia E., Viboud, Cecile, Grenfell, Bryan T., and Lipsitch, Marc
Abstract:: Corrections 18 Mar 2010: Shaman J, Pitzer VE, Viboud C, Grenfell BT, Lipsitch M (2010) Correction: Absolute Humidity and the Seasonal Onset of Influenza in the Continental United States. PLOS Biology 8(3): 10.1371/annotation/35686514-b7a9-4f65-9663-7baefc0d63c0. 15 Mar 2010: Shaman J, Pitzer VE, Viboud C, Grenfell BT, Lipsitch M (2010) Correction: Absolute Humidity...
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Full Text:: T. Grenfell2,4,5, Marc Lipsitch6,7,8 1 College of Oceanic and Atmospheric Sciences, Oregon State

MicroSoar: A New Instrument for Measuring Microscale Turbulence from Rapidly Moving Submerged Platforms

Creator:: Dillon, T. M., Barth, J. A., Erofeev, A. Y., May, G. H., and Wijesekera, H. W.
Abstract:: A new high-frequency turbulence measuring instrument, MicroSoar, has been developed, tested, and used to make scalar variance dissipation rate measurements. MicroSoar was mounted on the undercarriage of SeaSoar, a depth-programmable winged platform, and towed by a ship, at speeds up to 7 kt, in a depth range of the sea...
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Full Text:: from Rapidly Moving Submerged Platforms T. M. DILLON, J. A. BARTH, A. Y. EROFEEV, G. H. MAY, AND H. W

Influence of the Amsterdam/St. Paul hot spot along the Southeast Indian Ridge between 77° and 88°E: Correlations of Sr, Nd, Pb, and He isotopic variations with ridge segmentation

Creator:: Nicolaysen, K. P., Frey, F. A., Mahoney, J. J., Johnson, K. T. M., and Graham, David W.
Abstract:: The submarine Amsterdam-St. Paul (ASP) Plateau, bisected by the Southeast Indian Ridge (SEIR), is a bathymetric high rising ~2 km above the surrounding seafloor that includes the islands of Amsterdam and St. Paul; this excess volcanism is attributed to a mantle hot spot. We obtained new Sr, Nd, and Pb...
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Full Text:: , Massachusetts 02139, USA J. J. Mahoney and K. T. M. Johnson School of Ocean and Earth Science and Technology

Measurement of Directional Wave Spectra Using Aircraft Laser Altimeters

Creator:: Sun, J., Burns, S. P., Vandemark, D., Donelan, M. A., Mahrt, L., Crawford, Timothy L., Herbers, T. H. C., Crescenti, G. H., and French, J. R.
Abstract:: A remote sensing method to measure directional oceanic surface waves by three laser altimeters on the NOAA LongEZ aircraft is investigated. To examine feasibility and sensitivity of the wavelet analysis method to various waves, aircraft motions, and aircraft flight directions relative to wave propagation directions, idealized surface waves are simulated...
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Full Text:: Altimeters J. SUN,* S. P. BURNS,* D. VANDEMARK,� M. A. DONELAN,# L. MAHRT,@ TIMOTHY L. CRAWFORD,&,@@ T. H

Aircraft measurements of high average charges on cloud drops in layer clouds

Creator:: Beard, Kenneth V., Ochs, Harry T., III, and Twohy, Cynthia
Abstract:: The first reliable aircraft measurements of characteristic cloud drop charges were obtained by utilizing a counterflow virtual impactor to substantially increase charge sensitivity and eliminate spurious contact charging that contaminated previous aircraft measurements. We find average drop charges more than an order of magnitude larger than expected from mountain surface...
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Full Text:: mechanisms, J. Appl. Meteorol., 32, 608–625. Beard, K. V., and H. T. Ochs (1995), Collisions between small

Evidence for atmospheric control of sea-ice motion through Nares Strait

Creator:: Samelson, Roger M., Agnew, T., Melling, H., and Munchow, A.
Abstract:: Satellite observations of ice motion are combined with model estimates of low‐level winds and surface wind stress to provide evidence for atmospheric control of sea‐ice motion through Nares Strait, between Ellesmere Island and Greenland, during two periods in 2004. The results suggest that ice flux through the strait, and its...
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Full Text:: . Cassano, T. Klein, G. Heinemann, K. M. Hines, K. Steffen, and J. E. Box (2001), Mesoscale modeling of

Jet stream intraseasonal oscillations drive dominant ecosystem variations in Oregon’s summertime coastal upwelling system

Creator:: Bane, John M., Spitz, Yvette H., Letelier, Ricardo M., and Peterson, William T.
Abstract:: Summertime wind stress along the coast of the northwestern United States typically exhibits intraseasonal oscillations (ISOs) with periods from ≈15 to 40 days, as well as fluctuations on the 2- to 6-day “weather-band” and 1-day diurnal time scales. Coastal upwelling of cool, nutrient-rich water is driven by extended periods of...
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Full Text:: 21:727–750. 3. Bane J, Levine M, Samelson R, Haines S, Meaux M, Perlin N, Kosro P, Boyd T (2005) J

Geochronology of age-progressive volcanism of the Oregon High Lava Plains : implications for the plume interpretation of Yellowstone

Creator:: Jordan, Brennan T., Grunder, Anita L., Duncan, Robert A., and Deino, Alan L.
Abstract:: The High Lava Plains province (HLP) is a late Cenozoic bimodal volcanic field at the northern margin of the Basin and Range province in southeastern Oregon that hosts a westward younging trend of silicic volcanism that crudely mirrors northeastward migration of silicic volcanism along the Yellowstone–Snake River Plain (YSRP) trend....
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Full Text:: Oregon High Lava Plains: Implications for the plume interpretation of Yellowstone Brennan T. Jordan1

Comparison of Near-Forward Light Scattering on Oceanic Turbulence and Particles

Creator:: Bogucki, Darek J., Domaradzki, J. Andrzej, Stramski, Dariusz, and Zaneveld, J. Ronald
Abstract:: We examine and compare near-forward light scattering that is caused by turbulence and typical particulate assemblages in the ocean. The near-forward scattering by particles was calculated using Mie theory for homogeneous spheres and particle size distributions representative of natural assemblages in the ocean. Direct numerical simulations of a passive scalar...
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Full Text:: Picoplankton, T. Platt and W. Li, eds., Can. J. Fisheries Aquatic Sci. 214, 521–559 ~1986!. 18. J. B. Riley

Alkenones in sediments of Middle Valley, Leg 139 : application as thermal sensors

Creator:: Simoneit, Bernd R. T., Prahl, Fredrick, Leif, R. N., and Mao, S. Z.
Abstract:: The shallow sections of most holes drilled during Ocean Drilling Program Leg 139 contain alkenones derived from prymnesiophyte algae. The alkenones indicate a paleotemperature of the photic zone in the upper ocean during primary carbon fixation of 7°-15°C, with an average of 10.7°C. Based on laboratory hydrous pyrolyses these alkenones...
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Full Text:: (1993). The data were con- verted to temperature estimates using the calibration equation: U‰ = 0.042 T

The Efficiency of Mixing in Turbulent Patches: Inferences from Direct Simulations and Microstructure Observations

Creator:: Smyth, W. D., Moum, J. N., and Caldwell, D. R.
Abstract:: The time evolution of mixing in turbulent overturns is investigated using a combination of direct numerical simulations (DNS) and microstructure profiles obtained during two field experiments. The focus is on the flux coefficient Γ, the ratio of the turbulent buoyancy flux to the turbulent kinetic energy dissipation rate ϵ. In...
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Full Text:: phoc_31_719.1969_1992.tp AUGUST 2001 1969S M Y T H E T A L . q 2001

A novel method for determination of aragonite saturation state on the continental shelf of central Oregon using multi-parameter relationships with hydrographic data

Creator:: Juranek, L. W., Freely, R. A., Peterson, W. T., Alin, S. R., Hales, Burke, Lee, K., Sabine, C. L., and Peterson, J.
Abstract:: We developed a multiple linear regression model to robustly determine aragonite saturation state (Ωarag) from observations of temperature and oxygen (R² = 0.987, RMS error 0.053), using data collected in the Pacific Northwest region in late May 2007. The seasonal evolution of Ωarag near central Oregon was evaluated by applying...
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Full Text:: : Juranek, L. W., R. A. Feely, W. T. Peterson, S. R. Alin, B. Hales, K. Lee, C. L. Sabine, and J. Peterson

Climate Sensitivity of the Community Climate System Model, Version 4

Creator:: Bitz, C. M., Shell, K. M., Gent, P. R., Bailey, D. A., Danabasoglu, G., Armour, K. C., Holland, M. M., and Kiehl, J. T.
Abstract:: Equilibrium climate sensitivity of the Community Climate System Model, version 4 (CCSM4) is 3.20 degrees C for 1 degrees horizontal resolution in each component. This is about a half degree Celsius higher than in the previous version (CCSM3). The transient climate sensitivity of CCSM4 at 1 degrees resolution is 1.72...
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Full Text:: AND J. T. KIEHL National Center for Atmospheric Research, Boulder, Colorado (Manuscript received 23

Spectral particulate attenuation and particle size distribution in the bottom boundary layer of a continental shelf

Creator:: Boss, Emmanuel, Pegau, W. Scott, Gardner, Wilford D., Zaneveld, J. Ronald, Barnard, Andrew H., Twardowski, Michael S., Chang, G. C., and Dickey, T. D.
Abstract:: Spectral attenuation and absorption coefficients of particulate matter and collocated hydrographic measurements were obtained in the Mid-Atlantic Bight during the fall of 1996 and the spring of 1997 as part of the Coastal Mixing and Optics experiment. Within the bottom boundary layer (BBL) the magnitude of the beam attenuation decreased...
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Full Text:: . Gardner, 2 J. Ronald V. Zaneveld, • Andrew H. Barnard, • Michael S. Twardowski, • G. C. Chang, 3,4 and T

Precision of the current methods to measure the alkenone proxy U₃₇ K’ and absolute alkenone abundance in sediments: results of an interlaboratory comparison study

Creator:: Rosell-Melé, A., Bard, E., Emeis, K.-C., Grimalt, J. O., Muller, P., Schneider, R., Bouloubassi, I., Epstein, B., Fahl, K., Fluegge, A., Freeman, K., Goñi, M., Güntner, U., Hartz, D., Hellebust, S., Herbert, T., Ikehara, M., Ishiwatari, R., Kawamura, K., Kenig, F., de Leeuw, J., Lehman, S., Mejanelle, L., Ohkouchi, N., Pancost, R. D., Pelejero, C., Prahl, Fredrick, Quinn, J., Rontani, J.-F., Rostek, F., Rullkötter, J., Sachs, J., Blanz, T., Sawada, K., Schulz-Bull, D., Sikes, E., Sonzogni, C., Ternois, Y., Versteegh, G., Volkman, J. K., and Wakeham, S.
Abstract:: Measurements of the U₃₇ K’ index and the absolute abundance of alkenones in marine sediments are increasingly used in paleoceanographic research as proxies of past sea surface temperature and haptophyte (mainly coccolith-bearing species) primary productivity, respectively. An important aspect of these studies is to be able to compare reliably data...
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Full Text:: , Germany J. O. Grimalt Departamento Quı́mica Ambiental, CID-CSIC, Jordi Girona 18, Barcelona E-08034

A comprehensive approach for habitat restoration in the Columbia Basin

Creator:: Rieman, Bruce E., Smith, Courtland L., Naiman, Robert J., Ruggerone, Gregory T., Wood, Christ C., Huntly, Nancy, Merril, Erik N., Alldredge, J. Richard, Bisson, Peter A., Congleton, James, Fausch, Kurt D., Levings, Colin, Pearcy, William, Scarnecchia, Dennis, and Smouse, Peter
Abstract:: The Columbia Basin once supported a diversity of native fishes and large runs of anadromous salmonids that sustained substantial fisheries and cultural values. Extensive land conversion, watershed disruptions, and subsequent fishery declines have led to one of the most ambitious restoration programs in the world. Progress has been made, but...
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Full Text:: , B. E., Smith, C. L., Naiman, R. J., Ruggerone, G. T., Wood, C. C., Huntly, N., ... & Smouse, P

A paleomagnetic approach toward refining Holocene radiocarbon-based chronologies: Paleooceanographic records from the north Iceland (MD99-2269) and east Greenland (MD99-2322) margins

Creator:: Stoner, Joseph, Jennings, Anne, Kristjánsdóttir, Gréta B., Dunhill, Gita, Andrews, John T., and Hardardóttir, Jorunn
Abstract:: We report the intercalibration of paleomagnetic secular variation (PSV) and expanded postglacial sediment cores from geographically proximal, but sedimentologically contrasting settings. The objective is to improve relative what can be achieved with either method alone. Core MD99-2269 was taken from north Iceland shelf. Core MD99-2322 was collected from the Kangerlussuaq...
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Full Text:: , G. Dunhill, J. T. Andrews, and J. Hardardóttir (2007), A paleomagnetic approach toward refining

Energy transport by nonlinear internal waves

Creator:: Moum, J. N., Klymak, J. M., Nash, J. D., Perlin, A., and Smyth, W. D.
Abstract:: Winter stratification on Oregon’s continental shelf often produces a near-bottom layer of dense fluid that acts as an internal waveguide upon which nonlinear internal waves propagate. Shipboard profiling and bottom lander observations capture disturbances that exhibit properties of internal solitary waves, bores, and gravity currents. Wavelike pulses are highly turbulent...
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Full Text:: Energy Transport by Nonlinear Internal Waves J. N. MOUM College

Metabolically active bacteria in Lake Kinneret

Creator:: Berman, T., Kaplan, B., Chava, S., Viner, Y., Sherr, Barry F., and Sherr, Evelyn
Abstract:: Three staining methods were used to identify metabolically active bacteria in Lake Kinneret, northern Israel: CTC, DAPI staining followed by a propanol wash, and the Molecular Probes Live/Dead stain. Positive results from these methods purport to show, respectively, actively respiring bacteria (CTC+), cells with intact nucleoids (NuCC), and cells with...
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Full Text:: 2001 *E-mail: tberman@ocean.org.il Metabolically active bacteria in Lake Kinneret T. Berman1,*, B

Crustal‐scale pure shear foreland deformation of western Argentina

Creator:: Meigs, Andrew J. and Nábělek, John
Abstract:: New analyses of teleseismic body waves from moderate earthquakes in western Argentina demonstrate that active shortening of the Andean foreland occurs on reverse faults extending to 40–50 km depth. Existing crustal‐scale models of foreland deformation invoke thin‐skinned fault geometries, which root into an east‐dipping mid‐crustal décollement. Whereas thin‐skinned thrust sheets...
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Full Text:: , Tectonics, 2(6), 529–563, doi:10.1029/ TC002i006p00529. Costa, C. H., T. Rockwell, J. Paredes, and C

Precise dating of the Holmatindur cooling event in eastern Iceland: Evidence for mid-Miocene bipolar glaciation

Creator:: Duncan, Robert A. and Helgason, J.
Abstract:: A succession of basaltic lavas, volcaniclastic sediments, and lignite beds in the Holmatindur region of eastern Iceland provides the means for tying magnetic reversal stratigraphy and a record of major North Atlantic cooling to a precise radiometric timescale. A prominent part of the section is the Holmatindur classic bed, which...
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Full Text:: , 1977. Wolf-Welling, T. C. W., A. B. Winkler, S. O'Connell, M. Cremer, F. Rack, K. Statteger, and J

The influence of bottom morphology on reflectance : theory and two-dimensional geometry model

Creator:: Zaneveld, J. Ronald and Boss, Emmanuel
Abstract:: The reflectance of the bottom is of importance when interpreting optical data in shallow water. Closure studies of radiative transfer, interpretation of laser line scanner data, lidar, and remote sensing in shallow waters require understanding of the bottom reflectance. In the Coastal Benthic Optical Properties experiment (CoBOP), extensive measurements of...
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Full Text:: ZANEVELD, J. RONALD V., AND EMMANUEL BOSS The influence of bottom

Differential Diffusion in Breaking Kelvin–Helmholtz Billows

Creator:: Smyth, W. D., Nash, J. D., and Moum, J. N.
Abstract:: Direct numerical simulations are used to compare turbulent diffusivities of heat and salt during the growth and collapse of Kelvin–Helmholtz billows. The ratio of diffusivities is obtained as a function of buoyancy Reynolds number Re[subscript]b and of the density ratio R[subscript]ρ (the ratio of the contributions of heat and salt...
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Full Text:: . SMYTH, J. D. NASH, AND J. N. MOUM College of Oceanic and Atmospheric Sciences, Oregon State University

Narrowband Oscillations in the Upper Equatorial Ocean. Part II: Properties of Shear Instabilities

Creator:: Smyth, W. D., Moum, J. N., and Nash, J. D.
Abstract:: Narrowband oscillations observed in the upper equatorial Pacific are interpreted in terms of a random ensemble of shear instability events. Linear perturbation analysis is applied to hourly averaged profiles of velocity and density over a 54-day interval, yielding a total of 337 unstable modes. Composite profiles of mean states and...
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Full Text:: Ocean. Part II: Properties of Shear Instabilities W. D. SMYTH, J. N. MOUM, AND J. D. NASH College of

Monte Carlo Study of the Scattering Error of a Quartz Reflective Absorption Tube

Creator:: Piskozub, Jacek, Flatau, Piotr J., and Zaneveld, J. V. Ronald
Abstract:: A Monte Carlo model was used to study the scattering error of an absorption meter with a divergent light beam and a limited acceptance angle of the receiver. Reflections at both ends of the tube were taken into account. Calculations of the effect of varying optical properties of water as...
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Full Text:: . Greenstein, 1941: Diffuse radiation in the galaxy. Astrophys. J., 93, 70–83. Kirk, J. T. O., 1992: Monte

Seasonal renewal of the California Current: The spring transition off California

Creator:: Lynn, Ronald J., Bograd, Steven J., Chereskin, Teresa K., and Huyer, Adriana, 1945-
Abstract:: A pair of high-resolution oceanographic surveys in March and April 1995 revealed a large and rapid transition from late winter to spring conditions in the coastal zone off central and southern California. These data are unique in capturing the detailed three-dimensional physical structure of and biological response to the spring...
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Full Text:: boundary current Citation: Lynn, R. J., S. J. Bograd, T. K. Chereskin, and A. Huyer, Seasonal renewal of

Mode 2 waves on the continental shelf : ephemeral components of the nonlinear internal wavefield

Creator:: Shroyer, E. L., Moum, J. N., and Nash, J. D.
Abstract:: Shoreward propagating, mode 2 nonlinear waves appear sporadically in mooring records obtained off the coast of New Jersey in the summer of 2006. Individual mode 2 packets were tracked between two moorings separated by 1 km; however, packets could not be tracked between moorings separated by greater distances from one...
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Full Text:: . References Akylas, T., and R. Grimshaw (1992), Solitary internal waves with oscilla- tory tails, J. Fluid

Spatial and Temporal Variability of the M2 Internal Tide Generation and Propagation on the Oregon Shelf

Creator:: Osborne, J. J., Kurapov, A. L., Egbert, G. D., and Kosro, P. M.
Abstract:: A 1-km-horizontal-resolution model based on the Regional Ocean Modeling System is implemented along the Oregon coast to study average characteristics and intermittency of the M₂ internal tide during summer upwelling. Wind-driven and tidally driven flows are simulated in combination, using realistic bathymetry, atmospheric forcing, and boundary conditions. The study period...
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Full Text:: Internal Tide Generation and Propagation on the Oregon Shelf J. J. OSBORNE, A. L. KURAPOV, G. D. EGBERT

Edge gradients provide evidence of ecological interactions in planktonic thin layers

Creator:: Benoit-Bird, Kelly J., Cowles, Timothy J., and Wingard, Christopher E.
Abstract:: Physical, optical, and acoustical data from Monterey Bay, California, USA, describing the distributions of phytoplankton, zooplankton, and small fish as well as gradients in the physical habitat were used to examine the interactions between vertically compressed plankton structures (thin layers), their consumers, and the local physical forces they experience. The...
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Full Text:: . HOLLIDAY, C. F. GREENLAW, P. L. DONAGHAY, AND T. J. COWLES. 2007. Effects of mesoscale physical processes

Observation of sound focusing and defocusing due to propagating nonlinear internal waves

Creator:: Luo, J., Badiey, M., Karjadi, E. A., Katsnelson, B., Tskhoidze, A., Lynch, J. F., and Moum, J. N.
Abstract:: Fluctuations of the low frequency sound field in the presence of an internal solitary wave packet during the Shallow Water ’06 experiment are analyzed. Acoustic, environmental, and on-board ship radar image data were collected simultaneously before, during, and after a strong internal solitary wave packet passed through the acoustic track....
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Full Text:: waves,” J. Acoust. Soc. Am. 122(2), 747–760 (2007). 4A. E. Newhall, T. F. Duda, J. D. I. K. von der

A regional real-time forecast of marine boundary layers during VOCALS-REx

Creator:: Wang, S., O'Neill, L. W., Jiang, Q., de Szoeke, Simon P., Hong, X., Jin, H., Thompson, W. T., and Zheng, X.
Abstract:: This paper presents an evaluation and validation of the Naval Research Laboratory's COAMPS® real-time forecasts during the VOCALS-REx over the area off the west coast of Chile/Peru in the Southeast Pacific during October and November 2008. The analyses focus on the marine boundary layer (MBL) structure. These forecasts are compared...
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Full Text:: S. Wang1, L. W. O’Neill2, Q. Jiang1, S. P. de Szoeke3, X. Hong1, H. Jin1, W. T. Thompson1, and X

Low-pressure phase equilibria of anhydrous anorthite-bearing mafic magmas

Creator:: Kohut, Edward J. and Nielsen, Roger L.
Abstract:: One of the most persistent questions regarding the phase equilibria of mid-ocean ridge basalts (MORB) pertains to the petrogenesis of the anorthitic plagioclase phenocrysts (>An₉₀) that are characteristic of the more primitive members of such suites. Anorthitic phenocrysts are present in many if not most MORB suites in spite of...
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Full Text:: anorthite- bearing mafic magmas Edward J. Kohut Department of Geosciences, Oregon State University, 104

Broadband backscatter from individual Hawaiian mesopelagic boundary community animals with implications for spinner dolphin foraging

Creator:: Au, Whitlow W. L. and Benoit-Bird, Kelly J.
Abstract:: Broadband simulated dolphin echolocation signals were used to measure the ex situ backscatter properties of mesopelagic boundary community MBC in order to gain a better understanding of the echolocation process of spinner dolphins foraging on the MBC. Subjects were captured by trawling with a 2-m-opening Isaacs-Kidd Midwater Trawl. Backscatter measurements...
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Full Text:: frequency response of volume back- scatter,” J. Acoust. Soc. Am. 120, 3001. Chu, D., Stanton, T. K., and

Satellite Estimates and Shipboard Observations of Downward Radiative Fluxes at the Ocean Surface

Creator:: Guo, G. and Coakley, J. A., Jr.
Abstract:: Clouds and the Earth’s Radiant Energy System (CERES) uses a suite of instruments on the Terra and Aqua satellites combined with analyzed weather data and information on surface conditions to estimate surface radiative fluxes. CERES estimates for the Terra satellite were compared with measurements of the surface radiative fluxes collected...
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Full Text:: comparisons. 432 J O U R N A L O F A T M O S P H E R I C A N D O C E A N I C T E C H N O L O G Y VOLUME 25

Coastal Wind-Driven Circulation in the Vicinity of a Bank. Part I: Modeling Flow over Idealized Symmetric Banks

Creator:: Whitney, Michael M. and Allen, J. S.
Abstract:: This study examines how coastal banks influence wind-driven circulation along stratified continental shelves. Numerical experiments are conducted for idealized symmetric banks; the standard bank (200 km long and 50 km wide) has dimensions similar to the Heceta Bank complex along the Oregon shelf. Model runs are forced with 10 days...
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Full Text:: Marine Sciences, University of Connecticut, Groton, Connecticut J. S. ALLEN College of Oceanic and

Internal‐tide generation and destruction by shoaling internal tides

Creator:: Kelly, S. M. and Nash, J. D.
Abstract:: Internal‐tide generation is usually predicted from local topography, surface tides, and stratification. However, internal tides are often observed to be unrelated to local spring‐neap forcing, appearing intermittently in 3–5 day bursts. Here we suggest a source of this intermittency by illustrating how remotely‐generated shoaling internal tides induce first‐order changes in...
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Full Text:: ., and T. Peacock (2010), Internal tide generation by arbitrary two‐dimensional topography, J. Fluid Mech

Coastal Wind-Driven Circulation in the Vicinity of a Bank. Part II: Modeling Flow over the Heceta Bank Complex on the Oregon Coast

Creator:: Whitney, Michael M. and Allen, J. S.
Abstract:: This study investigates wind-driven circulation in the vicinity of the Heceta Bank complex along the Oregon shelf. Numerical experiments forced with steady winds (0.1 Pa) are conducted; upwelling and downwelling cases are compared. The asymmetric bank bathymetry is the only configurational difference from the symmetric bank runs analyzed in Part...
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Full Text:: . WHITNEY Department of Marine Sciences, University of Connecticut, Groton, Connecticut J. S. ALLEN

Cooperative prey herding by the pelagic dolphin, Stenella longirostris

Creator:: Benoit-Bird, Kelly J. and Au, Whitlow W. L.
Abstract:: Sonar techniques were used to quantitatively observe foraging predators and their prey simultaneously in three dimensions. Spinner dolphins foraged at night in highly coordinated groups of 16–28 individuals using strict four-dimensional patterns to increase prey density by up to 200 times. Herding exploited the prey’s own avoidance behavior to achieve...
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Full Text:: dolphin, Stenella longirostris Kelly J. Benoit-Birda� College of Oceanic and Atmospheric Sciences

Phonation behavior of cooperatively foraging spinner dolphins

Creator:: Benoit-Bird, Kelly J. and Au, Whitlow W. L.
Abstract:: Groups of spinner dolphins have been shown to cooperatively herd small prey. It was hypothesized that the strong group coordination is maintained by acoustic communication, specifically by frequency-modulated whistles. Observations of groups of spinner dolphins foraging at night within a sound-scattering layer were made with a multibeam echosounder while the...
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Full Text:: feeding habits,” J. Fish. Res. Board Can. 25, 2561– 2574. Foote, K. G., Chu, D., Hammar, T. R., Baldwin

Coordinated nocturnal behavior of foraging jumbo squid Dosidicus gigas

Creator:: Benoit-Bird, Kelly J. and Gilly, William F.
Abstract:: We used split-beam acoustic techniques to observe free-swimming of jumbo squid Dosidicus gigas during 4 cruises in the Gulf of California. Four-dimensional spatio-temporal data revealed that at night in shallow water, jumbo squid were using ascending, spiral-like swimming paths to emerge from extremely dense aggregations, and were likely foraging on...
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Full Text:: Coordinated nocturnal behavior of foraging jumbo squid Dosidicus gigas Kelly J. Benoit-Bird1,*, William F

Defining the word "Seamount"

Creator:: Staudigel, Hubert, Koppers, Anthony A. P., Lavelle, J. William, Pitcher, Tony J., and Shank, Timothy M.
Abstract:: Reading through this issue of Oceanography, it will become apparent that researchers in different disciplines see their seamounts in quite different ways. The term seamount has been defined many times (e.g., Menard, 1964; Wessel, 2001; Schmidt and Schmincke, 2000; Pitcher et al., 2007; International Hydrographic Organization, 2008; Wessel et al.,...
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Full Text:: | Defining the Word “Seamount” By Hubert Staudigel, Anthony A.P. Koppers, J. William Lavelle, Tony J. Pitcher

Hyperspectral Imager for the Coastal Ocean: instrument description and first images

Creator:: Lucke, Robert L., Corson, Michael, McGlothlin, Norman R., Butcher, Steve D., Wood, Daniel L., Korwan, Daniel R., Li, Rong R., Snyder, William A., Davis, Curt O., and Chen, Davidson T.
Abstract:: The Hyperspectral Imager for the Coastal Ocean (HICO) is the first spaceborne hyperspectral sensor designed specifically for the coastal ocean and estuarial, riverine, or other shallow-water areas. The HICO generates hyperspectral images, primarily over the 400–900 nm spectral range, with a ground sample distance of ≈90 m (at nadir) and a high...
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Full Text:: Daniel L. Wood,2 Daniel R. Korwan,1 Rong R. Li,1 Willliam A. Snyder,1 Curt O. Davis,3 and Davidson T

Potential for non-destructive astrochemistry using the ExoMars PanCam

Creator:: Storrie-Lombardi, Michael C., Muller, J.-P., Fisk, Martin R., Griffiths, A. D., and Coates, A. J.
Abstract:: We investigate the utility of adding a 365 nm ultraviolet (UV) light source to the ExoMars panoramic camera (PanCam) scheduled for launch in 2013. The modification makes it feasible to monitor rover drill cuttings for aromatic organic molecules and provide constraints on polycyclic aromatic hydrocarbons (PAH) as a function of...
Resource Type:: Article
Full Text:: , Nature, 355, 125–132. Coates, A. J., F. J. Crary, G. R. Lewis, D. T. Young, J. H. Waite Jr., and E. C

Turbulence Decay and Restratification in the Equatorial Ocean Surface Layer following Nighttime Convection

Creator:: Caldwell, D. R., Lien, R-C., Moum, J. N., and Gregg, M. C.
Abstract:: Although the process of restratification of the ocean surface layer at the equator following nighttime convection is similar in many ways to the process at midlatitudes, there are important differences. A composite day calculated from 15 days of consistent conditions at 140°W on the equator was compared with midlatitude observations...
Resource Type:: Article
Full Text:: , t)zz 21 211 (rC ) (D )p mld o·(J 2 I(D , t))Dt]. (2)b mld Below the mixed layer depth T(z, t 1 Dt

Normal-Mode Instabilities of a Time-Dependent Coastal Upwelling Jet

Creator:: Durski, S. M., Samelson, R. M., and Allen, J. S.
Abstract:: The linear stability of a nearly time-periodic, nonlinear, coastal upwelling–downwelling circulation, over alongshore-uniform topography, driven by a time-periodic wind stress is investigated using numerical methods. The near-periodic alongshore-uniform basic flow is obtained by forcing a primitive equation numerical model of coastal ocean circulation with periodic wind stress. Disturbance growth on...
Resource Type:: Article
Full Text:: , Y. Q., T. N. Battisti, J. J. Palmer, and E. S. Sarachik, 1997: A study of the predictability of

Testing the odontocete acoustic prey debilitation hypothesis: No stunning results

Creator:: Benoit-Bird, Kelly J., Au, Whitlow W. L., and Kastelein, Ronald A.
Abstract:: The hypothesis that sounds produced by odontocetes can debilitate fish was examined. The effects of simulated odontocete pulsed signals on three species of fish commonly preyed on by odontocetes were examined, exposing three individuals of each species as well as groups of four fish to a high-frequency click of a...
Resource Type:: Article
Full Text:: hypothesis: No stunning results Kelly J. Benoit-Bird College of Oceanic and Atmospheric Sciences, Oregon

Modes of Global Climate Variability during Marine Isotope Stage 3 (60–26 ka)

Creator:: Pisias, Nicklas G., Clark, Peter U., and Brook, Edward J.
Abstract:: Recent analysis of 38 globally distributed paleoclimatic records covering Marine Isotope Stage 3 (MIS 3) 60–26 ka demonstrated that the two leading empirical orthogonal functions (EOFs) explaining the data are the Greenland ice-core signal (“northern” signal) and the Antarctic ice-core signal (“southern” signal). Here singular spectral analysis (SSA) is used...
Resource Type:: Article
Full Text:: -core record (gray) on the GICC05 time scale. 1584 J O U R N A L O F C L I M A T E VOLUME 23 sea ice

Upward shifts in the southern Hydrate Ridge gas hydrate stability zone following postglacial warming, offshore Oregon

Creator:: Bangs, Nathan Lawrence Bailey, Musgrave, Robert J., and Tréhu, Anne Martine
Abstract:: High‐resolution three‐dimensional (3‐D) seismic reflection data acquired on the R/V Thomas G. Thompson in 2000 reveal a pair of bottom simulating reflections (BSRs) across a broad region of southern Hydrate Ridge, offshore Oregon. The primary BSR (BSRp) is a regionally extensive reflection that lies 120–150 m below seafloor and exhibits...
Resource Type:: Article
Full Text:: Texas Institute for Geophysics, Austin, Texas, USA Robert J. Musgrave Department of Earth Sciences, La

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