Index Catalog // ScholarsArchive@OSU

Trends in the Brazil/Malvinas Confluence region

Creator:: Combes, Vincent and Matano, Ricardo P.
Abstract:: Observations show abrupt changes in the oceanic circulation of the southwestern Atlantic. These studies report a southward drift of the Brazil/Malvinas Confluence (BMC) and a change in the spectral characteristics of the Malvinas Current (MC) transport. We address the cause of these changes using the result of a high-resolution numerical...
Resource Type:: Article
Full Text:: spectral characteristics of the Malvinas Current (MC) transport. We address the cause of these changes

Regional variations in the influence of mesoscale eddies on near-surface chlorophyll

Creator:: Gaube, Peter, McGillicuddy, Dennis J., Jr., Chelton, Dudley B., Behrenfeld, Michael J., and Strutton, Peter G.
Abstract:: Eddies can influence biogeochemical cycles through a variety of mechanisms, including the excitation of vertical velocities and the horizontal advection of nutrients and ecosystems, both around the eddy periphery by rotational currents and by the trapping of fluid and subsequent transport by the eddy. In this study, we present an...
Resource Type:: Article
Full Text:: , Brazil-Malvinas Confluence, East Aus- tralia Current, and California Current System) were nearly

A two-way nested simulation of the oceanic circulation in the Southwestern Atlantic

Creator:: Combes, Vincent and Matano, Ricardo P.
Abstract:: This article presents the results of a high-resolution (1/12°), two-way nested simulation of the oceanic circulation in the southwestern Atlantic region. A comparison between the model results and extant observations indicates that the nested model has skill in reproducing the best-known aspects of the regional circulation, e.g., the volume transport...
Resource Type:: Article
Full Text:: Atlantic. The variations of the transport of the Malvinas Current are out of phase with those of the Brazil

A comparison of mechanisms generating vertical transport in the Brazilian coastal upwelling regions

Creator:: Mazzini, P. L. F. and Barth, John A.
Abstract:: Several mechanisms can drive vertical velocities in the coastal ocean, including wind-forcing and through gradients in the vorticity field generated by flow-topography interactions. A two-layer, steady, wind-driven, analytical model is applied to the major upwelling systems of Brazil : Cabo Frio (CF) and Cabo de Santa Marta (CSM) regions. Comparisons...
Resource Type:: Article
Full Text:: southward current occur, and in con- junction with a middle-shelf flow divergence promoted by the shelf

Advection–Dispersion Across Interfaces

Creator:: Ramirez, Jorge M., Thomann, Enrique A., and Waymire, Edward C.
Abstract:: This article concerns a systemic manifestation of small scale interfacial heterogeneities in large scale quantities of interest to a variety of diverse applications spanning the earth, biological and ecological sciences. Beginning with formulations in terms of partial differential equations governing the conservative, advective-dispersive transport of mass concentrations in divergence form,...
Resource Type:: Article

The Low-Frequency Variability of the Southern Ocean Circulation

Creator:: Giarolla, Emanuel and Matano, Ricardo P.
Abstract:: Abstract: Long time series of sea surface height (SSH), sea surface temperature, and wind stress curl are used to determine the main modes of low-frequency variability of the Southern Ocean (SO) circulation. The dominant mode is a trend of increasing SSH at an average rate of 3.3 mm yr(-1). Similar...
Resource Type:: Article
Full Text:: Malvinas Current in a global, eddy-permitting numerical simulation. J.Geophys. Res., 113,C11018, doi

State of the Climate in 2012

Creator:: Blunden, Jessica and Arndt, Derek S.
Abstract:: For the first time in several years, the El Niño-Southern Oscillation did not dominate regional climate conditions around the globe. A weak La Niña dissipated to ENSOneutral conditions by spring, and while El Niño appeared to be emerging during summer, this phase never fully developed as sea surface temperatures in...
Resource Type:: Article

Seasonality of U[superscript K’]₃₇ temperature estimates as inferred from sediment trap data

Creator:: Rosell-Melé, Antoni and Prahl, Fredrick G.
Abstract:: The seasonality of sea surface temperatures (SST) estimated from the alkenone-U[superscript K’]₃₇ index has been a debated issue since the development of the sediment trap time series data from 34 sampling locations, we show that the maximum alkenone flux in sediment traps varies markedly across the oceans, only on latitude...
Resource Type:: Article
Full Text:: transport in the Malvinas Current region, western Argentine Basin. 15 Deep-Sea Res Pt I 47, 2369-2393. 16

High-use areas, seasonal movements and dive patterns of juvenile loggerhead sea turtles in the Southwestern Atlantic Ocean

Creator:: Barcelo, Caren, Domingo, Andres, Miller, Philip, Ortega, Leonardo, Giffoni, Bruno, Sales, Gilberto, McNaughton, Lianne, Marcovaldi, Maria, Heppell, Selina S., and Swimmer, Yonat
Abstract:: Characterizing the behaviors of sea turtles and identifying high-use areas as they vary in time and space is important for conservation planning, particularly when turtles overlap with fisheries that may unintentionally harm them. Between July 2006 and March 2010, 27 satellite transmitters were deployed at sea on juvenile loggerheads Caretta...
Resource Type:: Article
Full Text:: warm Brazil current reaches its southernmost latitude during the austral summer (January, February, and

Covariability of Surface Wind and Stress Responses to Sea Surface Temperature Fronts

Creator:: O'Neill, Larry W., Chelton, Dudley B., and Esbensen, Steven K.
Abstract:: The responses of surface wind and wind stress to spatial variations of sea surface temperature (SST) are investigated using satellite observations of the surface wind from the Quick Scatterometer (QuikSCAT) and SST from the Advanced Microwave Scanning Radiometer on the Advanced Microwave Scanning Radiometer for Earth Observing System (EOS) (AMSR-E)...
Resource Type:: Article
Full Text:: Kuroshio, North and South Atlantic, and Agulhas Return Current regions. Since scatterometer wind stresses

A numerical study of the Magellan Plume

Creator:: Palma, Elbio D. and Matano, Ricardo P.
Abstract:: In this modeling study we investigate the dynamical mechanisms controlling the spreading of the Magellan Plume, which is a low-salinity tongue that extends along the Patagonian Shelf. Our results indicate that the overall characteristics of the plume (width, depth, spreading rate, etc.) are primarily influenced by tidal forcing, which manifests...
Resource Type:: Article
Full Text:: Malvinas Current on the Magellan Plume is more dominant north of 50�S, where it increases the along-shelf

Wind Speed and Stability Effects on Coupling between Surface Wind Stress and SST Observed from Buoys and Satellite

Creator:: O'Neill, Larry W.
Abstract:: The surface wind and stress responses to sea surface temperature (SST) are examined using collocated moored buoy and satellite observations in the Gulf Stream and the eastern equatorial Pacific. Using 17 buoy pairs, differences in the wind speed, 10-m equivalent neutral wind speed (ENW), and surface wind stress magnitude between...
Resource Type:: Article
Full Text:: al. 2009) and the Agulhas Return Current (Liu et al. 2007). Additionally, Sampe and Xie (2007) have

Geostrophic Velocity Measurement Techniques for the Meridional Overturning Circulation and Meridional Heat Transport in the South Atlantic

Creator:: Perez, Renellys C., Garzoli, Silvia L., Meinen, Christopher S., and Matano, Ricardo P.
Abstract:: Two ocean general circulation models are used to test the ability of geostrophic velocity measurement systems to observe the meridional overturning circulation (MOC) and meridional heat transport (MHT) in the South Atlantic. Model sampling experiments are conducted at five latitudes (between 15° and 34.5°S) spanning the range of extratropical current...
Resource Type:: Article
Full Text:: 2003). POCM successfully simulates the low- frequency variability of the ACC and the Malvinas Current

Shelfbreak upwelling induced by alongshore currents: analytical and numerical results

Creator:: Miller, Robert N., Matano, Ricardo P., and Palma, Elbio D.
Abstract:: Alongshore flow in the direction of propagation of coastal trapped waves can result in upwelling at the shelfbreak. The intensity of this upwelling can be comparable in magnitude to wind-driven coastal upwelling, with its associated ecological features. Recent numerical experiments by Matano & Palma indicate that this upwelling results from...
Resource Type:: Article
Full Text:: continuously fertilized by the steady flow of the Malvinas Current along the South American coast. R.N.M

Dynamical Analysis of the Boundary Layer and Surface Wind Responses to Mesoscale SST Perturbations

Creator:: O'Neill, Larry W., Esbensen, Steven K., Thum, Nicolai, Samelson, Roger M., and Chelton, Dudley B.
Abstract:: The dynamical response of the marine atmospheric boundary layer (MABL) to mesoscale sea surface temperature (SST) perturbations is investigated over the Agulhas Return Current during winter from a 1-month, high-resolution, three-dimensional simulation using the Weather Research and Forecasting (WRF) mesoscale model. A steady lower boundary condition for July 2002 is...
Resource Type:: Article
Full Text:: temperature (SST) perturbations is investigated over the Agulhas Return Current during winter from a 1-month

The Effects of SST-Induced Surface Wind Speed and Direction Gradients on Midlatitude Surface Vorticity and Divergence

Creator:: O'Neill, Larry W., Chelton, Dudley B., and Esbensen, Steven K.
Abstract:: The effects of surface wind speed and direction gradients on midlatitude surface vorticity and divergence fields associated with mesoscale sea surface temperature (SST) variability having spatial scales of 100–1000 km are investigated using vector wind observations from the SeaWinds scatterometer on the Quick Scatterometer (QuikSCAT) satellite and SST from the...
Resource Type:: Article
Full Text:: , Gulf Stream, South Atlantic, and Agulhas Return Current regions. Midlatitude SST fronts also

Game Theory and Fisheries: The Case Study of The Illex Argentinus Fishery in South America

Creator:: Villasante, Sebastian and Sumaila, Rashid
Abstract:: The Patagonian marine ecosystem is one of the most productive ecosystems in the world, with important commercial shared/straddling stocks. One of the highest mobility resources is the Argentine shortfin squid (Illex argentinus). Its distribution is limited to the area of influence of the warm-cold waters of sub-Antarctic origin, particularly of...
Resource Type:: Other
Full Text:: waters of sub-Antarctic origin, particularly of the Falkland Current; and it plays an important

A Global Climatology of Surface Wind and Wind Stress Fields from Eight Years of QuikSCAT Scatterometer Data

Creator:: Risien, Craig M. and Chelton, Dudley B.
Abstract:: Global seasonal cycles of the wind and wind stress fields estimated from the 8-yr record (September 1999–August 2007) of wind measurements by the NASA Quick Scatterometer (QuikSCAT) are presented. While this atlas, referred to here as the Scatterometer Climatology of Ocean Winds (SCOW), consists of 12 variables, the focus here...
Resource Type:: Article
Full Text:: which topographic, SST gradient, and ocean current influences on surface winds are plainly visible. Dis

On the Upwelling of Downwelling Currents

Creator:: Matano, Ricardo P. and Palma, Elbio D.
Abstract:: The term “downwelling currents” refers to currents with a downslope mass flux in the bottom boundary layer. Examples are the Malvinas and Southland Currents in the Southern Hemisphere and the Oyashio in the Northern Hemisphere. Although many of these currents generate the same type of highly productive ecosystems that is...
Resource Type:: Article
Full Text:: centers (Fig. 1). The chlorophyll blooms of the Malvinas Current are Corresponding author address

Air-sea interaction over ocean fronts and eddies

Creator:: Small, R. J., de Szoeke, Simon P., Xie, S. P., O'Neill, L., Seo, H., Song, Q., Cornillon, P., Spall, M., and Minobe, S.
Abstract:: Air-sea interaction at ocean fronts and eddies exhibits positive correlation between sea surface temperature (SST), wind speed, and heat fluxes out of the ocean, indicating that the ocean is forcing the atmosphere. This contrasts with larger scale climate modes where the negative correlations suggest that the atmosphere is driving the...
Resource Type:: Article
Full Text:: the North Atlantic Current (Fig. 2b, see also Chelton et al., 2004), the Brazil-Malvinas confluence in

A numerical study of the Southwestern Atlantic Shelf circulation : stratified ocean response to local and offshore forcing

Creator:: Palma, Elbio D., Matano, Ricardo P., and Piola, Alberto R.
Abstract:: This article discusses the results of a suite of numerical simulations of the oceanic circulation in the Southwestern Atlantic Shelf region that are aimed to characterize its mean circulation and seasonal variability and to determine the dynamical mechanisms controlling them. Our experiments indicate that south of 40°S the mean circulation...
Resource Type:: Article
Full Text:: Straits, tidal mixing, wind forcing, and the offshore influence of the Malvinas Current farther north. The

On the origins of the variability of the Malvinas Current in a global, eddy - permitting numerical simulations

Creator:: Fetter, Antonio F. and Mantano, Richard P.
Abstract:: This article investigates the origins of the variability of the Malvinas Current (MC) transport using the results of an eddy-permitting ocean general circulation model. First, the dynamical links between the variabilities of the MC and the Antarctic Circumpolar Current (ACC) transports at the Drake Passage are established. Time series analyses...
Resource Type:: Article
Full Text:: Malvinas Current in a global, eddy-permitting numerical simulation Antonio F. H. Fetter1 and Ricardo P

Global Microwave Satellite Observations of Sea Surface Temperature for Numerical Weather Prediction and Climate Research

Creator:: Chelton, Dudley B. and Wentz, Frank J.
Abstract:: Obtaining global sea surface temperature (SST) fields for the ocean boundary condition in numerical weather prediction (NWP) models and for climate research has long been problematic. Historically, such fields have been constructed by a blending of in situ observations from ships and buoys and satellite infrared observations from the Advanced...
Resource Type:: Article
Full Text:: Brazil–Malvinas Conf lu- ence, the ARC, and other regions of the Antarctic Circumpolar Current). The

The influence of the Plata River discharge on the western South Atlantic shelf

Creator:: Piola, Alberto R., Matano, Ricardo P., Palma, Elbio D., Moller, Osmar O., and Campos, Edmo J. D.
Abstract:: The influence of the Plata, the second largest river in South America, extends along a coastal strip of 1300 km. Historical hydrographic and wind data and numerical simulations are combined to determine the seasonal and interannual variability of the Plata plume and its relationship to the magnitude of the river...
Resource Type:: Article
Full Text:: <33.5 is shaded in gray. The Brazil Current (BC) and Malvinas Current (MC) are shown schematically

A numerical study of the Southwestern Atlantic Sheld circulation : barotropic response to tidal and wind forcing

Creator:: Palma, Elbio D., Matano, Ricardo P., and Piola, Alberto R.
Abstract:: This article analyzes the barotropic circulation in the Southwestern Atlantic Shelf using a three-dimensional numerical model forced with winds and tides. South of 40°S, the shelf circulation is dominated by the propagation of the semidiurnal tides. In this region the diurnal tides are generally weak, except at the shelf edge...
Resource Type:: Article
Full Text:: model. The dark shaded line is the schematic path of the Malvinas Current; the light shaded line is the

Geochemistry of back arc basin volcanism in Bransfield Strait, Antarctica: Subducted contributions and along-axis variations

Creator:: Keller, Randall A., Fisk, Martin R., Smellie, John L., Strelin, Jorge A., and Lawver, Lawrence A.
Abstract:: Bransfield Strait is a Quaternary, ensialic back arc basin at the transition from rifting to spreading. Fresh volcanic rocks occur on numerous submarine features distributed along the rift axis, including a discontinuous neovolcanic ridge similar to the nascent spreading centers seen in some other back arc basins. Smaller edifices near...
Resource Type:: Article

On the large-scale characteristics, fluxes, and variability of the North Atlantic Deep Water and its deep western boundary current deduced from nutrient and oxygen data

Creator:: García Jiménez, Hernán Eduardo
Resource Type:: Dissertation
Full Text:: Characteristics. Fluxes, and Variability of The North Atlantic Deep Water and Its Deep Western Boundary Current

Detecting aliased tidal errors in altimeter height measurements

Creator:: Schlax, Michael G. and Chelton, Dudley B.
Abstract:: A simple statistic is derived for quantifying the potential for the aliasing of tidal errors in a given linear estimate of sea surface height constructed from altimeter data. The existence of M2 tidal constituent errors in Geosat data processed in the traditional way (i.e., with orbit errors removed using least...
Resource Type:: Article
Full Text:: the Malvinas Basin, and in the Aghulas Return Current), loss of either ascending or descend- ing

Seasonal variability in the Southwestern Atlantic

Creator:: Matano, Ricardo P., Schlax, Michael G., and Chelton, Dudley B.
Abstract:: The circulation of the southwestern Atlantic Ocean is dominated by the Subtropical Gyre and the confluence of the Brazil and Malvinas currents. Observations indicate that the latitude of this confluence changes seasonally, lying farther north during the austral winter than during the summer. This phenomenon has important consequences for the...
Resource Type:: Article

Price elasticities in commodity trade models and external trade statistics

Creator:: Emami, Ali
Abstract:: The purpose of this study is to investigate the role of the source of the external trade statistics in measuring the price responsiveness of foreign demands and relative price competitiveness of the major exporting countries in trade of agricultural commodities in international markets. In particular, the papers included in this...
Resource Type:: Dissertation
Full Text:: Demand for U.S. Wheat Exports: Current Controversies ............. 4 Current Contentions, Policy

A study of Indian housing conditions of Wrangell institute students to determine the type of home management house needed

Creator:: Mann, Clara Malvina
Resource Type:: Masters Thesis

StrubPCEOASAltimeterDerivedSeasonal.pdf

Creator:: Strub, P. Ted, James, Corinne, Combes, Vincent, Matano, Ricardo P., and et al.
Abstract:: Altimeter sea surface height (SSH) fields are analyzed to define and discuss the seasonal circulation over the wide continental shelf in the SW Atlantic Ocean (27°–43°S) during 2001–2012. Seasonal variability is low south of the Rio de la Plata (RdlP), where winds and currents remain equatorward for most of the...
Full Text:: Malvinas Current (MC) in the south (Figure 1). The two western boundary currents meet near 388S, generating

Giannico GuillermoFishWildlifeGeneticSignaturesHistorical.pdf

Creator:: Vanhaecke, Delphine, de Leaniz, Carlos Garcia, Gajardo, Gonzalo, Dunham, Jason, Giannico, Guillermo, and Consuegra, Sofia
Abstract:: Aim: The ecological effects of biological invasions are well documented, but little is known about the effects of invaders on the genetic structure of native species. We examined the phylogeography, genetic variation and population structuring of two galaxiid fishes, Aplochiton zebra and A. taeniatus, threatened by non-native salmonids, and whose...
Full Text:: where the Antarctic Circumpolar Current and the Malvinas Current circumvent the Falkland Islands

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