Evidence for secondary circulation associated with a shelfbreak front is obtained from a high‐resolution, cross‐shelf section of hydrographic, optical and velocity fields. Convergence in the bottom boundary layer on the inshore side of the front and subsequent upwelling into the interior is evident by a mid‐water region of suspended bottom...
Two physical oceanography cruises on the R/V Endeavor were conducted by the co-PIs Jack Barth and Mike Kosro as part of the ONR-sponsored Coastal Mixing and Optics (CMO) Accelerated Research Initiative. The objective was to rapidly survey a region around 40.5N, 70.5W where a set of moorings and a stationary...
We present velocity observations from a shipborne acoustic Doppler current profiler (ADCP) on RIV Wecoma during cruise W9408A, August 23 to September 2, 1994. The ADCP processing procedures are described in detail. This cruise was part of the Coastal Jet Separation project, funded by the National Science Foundation, to study...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on R/V Wecoma during cruise W0105c (23 May to 13 June 2001). The cruise was a component (Survey I) of the Coastal Ocean Advances in Shelf Transport (COAST) experiment. The ADCP was an RD Instruments hull-mounted 153.6-kHz narrowband...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on RJV Revelle during cruises R9710 (20 October to 23 November 1997) and R9801 (9 January to 7 February 1998). The cruises were conducted as part of the Southern Ocean JGOFS (Joint Global Ocean Flux) Antarctic Polar Frontal...
We present velocity observations from a shipboard acoustic doppler current profiler (ADCP) on RN Wecoma during cruise W9508b, 17-27 August 1995. Results from the short half-day cruise W9508c on 31 August 1995 are also shown. The ADCP processing procedures for W9508b are described in detail. This cruise was part of...
Accurate ship velocity is important for determining absolute currents from acoustic Doppler current profiler (ADCP) measurements. In this paper, the authors describe the application of two methods to improve the quality of ship velocity estimates. The first uses wide-area differential global positioning system (WADGPS) navigation to improve ship positioning. During...
Lateral stirring is a basic oceanographic phenomenon affecting the distribution of physical, chemical, and biological fields. Eddy stirring at scales on the order of 100 km (the mesoscale) is fairly well understood and explicitly represented in modern eddy-resolving numerical models of global ocean circulation. The same cannot be said for...
Lateral stirring is a basic oceanographic phenomenon affecting the distribution of physical, chemical, and biological fields. Eddy stirring at scales on the order of 100 km (the mesoscale) is fairly well understood and explicitly represented in modern eddy-resolving numerical models of global ocean circulation. The same cannot be said for...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on
R/V Wecoma during cruise W0108a (6-25 August 2001). The cruise was a component (Survey
II) of the Coastal Ocean Advances in Shelf Transport (COAST) experiment. The ADCP was an
RD Instruments hull-mounted 153-kHz narrowband unit. Data were...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on
R/V Wecoma during cruise W0108a (6-25 August 2001). The cruise was a component (Survey
II) of the Coastal Ocean Advances in Shelf Transport (COAST) experiment. The ADCP was an
RD Instruments hull-mounted 153-kHz narrowband unit. Data were...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on
R/V Wecoma during cruise W0301b (19 January - 3 February 2003). The cruise was a component
(Survey III) of the Coastal Ocean Advances in Shelf Transport (COAST) experiment. The
ADCP was an RD Instruments hull-mounted 153-kHz narrowband...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on
R/V Wecoma during cruise W0301b (19 January - 3 February 2003). The cruise was a component
(Survey III) of the Coastal Ocean Advances in Shelf Transport (COAST) experiment. The
ADCP was an RD Instruments hull-mounted 153-kHz narrowband...
We investigated mesopredator effects on prey availability in the Ross Sea, Antarctica, assessing the reasons why Adélie penguin Pygoscelis adeliae foraging trip duration (FTD) increases and diet changes from krill to fish as numbers of foraging penguins and competing cetaceans increase in the penguins’ foraging area. To investigate penguins’ seasonally...
From mid-May to August 2011, extreme runoff in the Columbia River ranged from 14,000 to over 17,000 m³/s, more than two standard deviations above the mean for this period. The extreme runoff was the direct result of both melting of anomalously high snowpack and rainfall associated with the 2010–2011 La Niña....
Lateral stirring is a basic oceanographic phenomenon affecting the distribution of physical, chemical, and biological fields. Eddy stirring at scales on the order of 100 km (the mesoscale) is fairly well understood and explicitly represented in modern eddy-resolving numerical models of global ocean circulation. The same cannot be said for...
Various ocean-climate models driven by increased greenhouse gases and higher temperatures predict a decline in oceanic dissolved oxygen (DO) as a result of greater stratification, reduced ventilation below the thermocline, and decreased solubility at higher temperatures. Since spreading of low oxygen waters is underway and predicted to increase, understanding impacts...
Two near-surface dye releases were mapped on scales of minutes to hours temporally, meters to
order 1 km horizontally, and 1–20 m vertically using a scanning, depth-resolving airborne lidar. In both cases,
dye evolved into a series of rolls with their major axes approximately aligned with the wind and/or
near-surface...
While bubble plumes have been acoustically imaged in the water column above marine gas
hydrate deposits in many studies, little is known about the temporal variation in plume intensity. In
July 2008, we conducted surveys using 3.5 and 12 kHz echosounders and a 75 kHz acoustic Doppler
current profiler (ADCP)...
Climate models predict a decrease in oceanic dissolved oxygen and a thickening of the oxygen minimum zone, associated with global warming. Comprehensive observational analyses of oxygen decline are challenging, given generally sparse historical data. The Newport hydrographic (NH) line off central Oregon is one of the few locations in the...
Wind-driven coastal ocean upwelling supplies nutrients to the
euphotic zone near the coast. Nutrients fuel the growth of phytoplankton,
the base of a very productive coastal marine ecosystem
[Pauly D, Christensen V (1995) Nature 374:255–257]. Because
nutrient supply and phytoplankton biomass in shelf waters are
highly sensitive to variation in...
In summer 1988, we made repeated mesoscale surveys of a grid extending 200 km offshore between
37°N and 39°N in the coastal transition zone off northern California, obtaining continuous acoustic
Doppler current profiler data and conductivity-temperature-depth data at standard stations 25 km apart
on alongshore sections 40 km apart. All...
In 2005, the onset of spring conditions in the physics
of the coastal ocean (lowered sea level, spin-up of
vertically-sheared equatorward coastal jet) came about 50
days later than average off Newport Oregon, on May 24.
There was a further delay of 50 days before the subsurface
upwelled water penetrated...
Repeated microstructure transects across filaments in the coastal transition zone (CTZ) have
Revealed fundamental structure and dynamics of the complicated features. The measurements allow
detailed momentum and vorticity analyses and provide a possible explanations for structural
asymmetry of the fronts. Observations made between July 2 and July 23, 1988, along...
The linear stability of a coastal transition zone (CTZ) jet is analyzed using a six-layer quasi-geostrophic model with observed basic state velocity profiles. The velocity profiles are obtained from objectively analyzed hydrographic and acoustic doppler data from the 1987 CTZ pilot experiment. Along-jet perturbation wave-lengths of 260-265 km are found...
In the northern California Current, the onset of the 2005
upwelling season was five weeks later than usual, and well established
upwelling with a cold surface signature did not
occur until about seven weeks after this. As part of the joint
US-Canada Pacific hake survey, from 14–16 July 2005 we...
As part of the U.S. Joint Global Ocean Flux Study Southern Ocean
program, high-resolution surveys of the Antarctic Polar Front near 170øW were
conducted during October-November 1997 with a towed undulating system equipped
with conductivity-temperature-depth and bio-optical sensors. Transects along
170°W and two successive mapping surveys revealed zonal bands with...
We sharpen our view of an eastern boundary current region during
the upwelling season through the analysis of several data sets.
We focus on the mesoscale flow field off of northern California,
observed during the Coastal Transition Zone (CTZ) experiment of 1988.
First, we estimate tidal currents in the region...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on RN Endeavor during cruises E9608 (14 August to 1 September 1996) and E9704 (25 April to 15 May 1997). The cruises were conducted as part of the Office of Naval Research Coastal Mixing and Optics Accelerated Research...
During Spring and Summer 1999, as part of the Oregon State University National Oceanographic Partnership Program (OSU-NOPP) field program, 20 successful hydrographic surveys were undertaken on the Oregon mid- to inner shelf, all near Yaquina Bay. These consisted of 17 cross-shelf sections along the Newport Hydrographic line ( extending approximately...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on
R/V Wecoma during cruise W0301b (19 January - 3 February 2003). The cruise was a component
(Survey III) of the Coastal Ocean Advances in Shelf Transport (COAST) experiment. The
ADCP was an RD Instruments hull-mounted 153-kHz narrowband...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on
R/V Wecoma during cruise W0108a (6-25 August 2001). The cruise was a component (Survey
II) of the Coastal Ocean Advances in Shelf Transport (COAST) experiment. The ADCP was an
RD Instruments hull-mounted 153-kHz narrowband unit. Data were...
We present velocity observations from a shipboard acoustic Doppler current profiler (ADCP) on RIV Revelle during cruises R9711 (30 November 1997 to 3 January 1998) and R9802 (13 February 1998 to 19 March 1998). The cruises were conducted as part of the Southern Ocean JGOFS (Joint Global Ocean Flux) Antarctic...