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Andrey Shcherbina

Principal Oceanographer

Affiliate Assistant Professor, Civil and Environmental Engineering

Email

ashcherbina@apl.washington.edu

Phone

206-897-1446

Department Affiliation

Ocean Physics

Education

M.S. Physical Oceanography, Moscow Institute of Physics and Technology, 1998

Ph.D. Physical Oceanography, Scripps Institution of Oceanography, 2004

Andrey Shcherbina's Website

http://faculty.washington.edu/shcher/

Projects

Salinity Processes in the Upper Ocean Regional Study — SPURS

The NASA SPURS research effort is actively addressing the essential role of the ocean in the global water cycle by measuring salinity and accumulating other data to improve our basic understanding of the ocean's water cycle and its ties to climate.

15 Apr 2015

Lateral Mixing

Small scale eddies and internal waves in the ocean mix water masses laterally, as well as vertically. This multi-investigator project aims to study the physics of this mixing by combining dye dispersion studies with detailed measurements of the velocity, temperature and salinity field during field experiments in 2011 and 2012.

1 Sep 2012

APL-UW Involvement in the Coastal Margin Observation and Prediction Science and Technology Center (CMOP)

AUVs will be deployed by a newly formed APL-UW AUV group as part of CMOP's experimental observation network which consists of multiple fixed and mobile platforms equipped with oceanographic sensors.

More Info

15 Jun 2012

The Center for Coastal Margin Observation and Predication (CMOP) has purchased from Hydroid, LLC two Autonomous Underwater Vehicles (AUVs) for its studies. The REMUS (Remote Environmental Measuring Units) 100 (see Figure 1) is a compact, light-weight, AUV designed for operation in coastal environments up to 100 meters in depth. The AUVs will be deployed by a newly formed APL-UW AUV group as part of CMOP's experimental observation network which consists of multiple fixed and mobile platforms equipped with oceanographic sensors. The AUVs will be used, primarily, to study the Columbia River plume and estuary region. The AUVs will be deployed periodically throughout each operational year. We also plan to allow customization of the AUVs by integrating novel biogeochemical sensors to meet specific scientific objectives for the CMOP program.

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Publications

2000-present and while at APL-UW

Observing finescale oceanic velocity structure with an autonomous Nortek acoustic Doppler current profiler

Shcherbina, A.Y., E.A. D'Asaro, and S. Nylund, "Observing finescale oceanic velocity structure with an autonomous Nortek acoustic Doppler current profiler," J. Atmos. Oceanic Technol., 35, 411–427, doi:10.1175/JTECH-D-17-0108.1, 2018.

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1 Feb 2018

This paper describes the instrumentation and techniques for long-term targeted observation of the centimeter-scale velocity structure within the oceanic surface boundary layer, made possible by the recent developments in capabilities of autonomous platforms and self-contained pulse-coherent acoustic Doppler current profilers (ADCPs). Particular attention is paid to the algorithms of ambiguity resolution ("unwrapping") of pulse-coherent Doppler velocity measurements. The techniques are demonstrated using the new Nortek Signature1000 ADCP mounted on a Lagrangian float, a combination shown to be capable of observing ocean turbulence in a number of recent studies. Statistical uncertainty of the measured velocities in relation to the ADCP setup is also evaluated. Described techniques and analyses should be broadly applicable to other autonomous and towed applications of pulse-coherent ADCPs.

Observations of near-surface current shear help describe oceanic oil and plastic transport

Laxague, N.J.M., and 10 others, including A. Shcherbina, "Observations of near-surface current shear help describe oceanic oil and plastic transport," Geophys. Res. Lett., 45 ,245-249, doi:10.1002/2017GL075891, 2018.

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16 Jan 2018

Plastics and spilled oil pose a critical threat to marine life and human health. As a result of wind forcing and wave motions, theoretical and laboratory studies predict very strong velocity variation with depth over the upper few centimeters of the water column, an observational blind spot in the real ocean. Here we present the first-ever ocean measurements of the current vector profile defined to within 1 cm of the free surface. In our illustrative example, the current magnitude averaged over the upper 1 cm of the ocean is shown to be nearly four times the average over the upper 10 m, even for mild forcing. Our findings indicate that this shear will rapidly separate pieces of marine debris which vary in size or buoyancy, making consideration of these dynamics essential to an improved understanding of the pathways along which marine plastics and oil are transported.

Ocean convergence and the dispersion of flotsam

D'asaro, E.A., A.Y. Shcherbina, and 17 others, "Ocean convergence and the dispersion of flotsam," Proc. Nat. Acad. Sci. U.S.A., EOR, doi:10.1073/pnas.1718453115, 2018.

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16 Jan 2018

Ocean currents move material released on the ocean surface away from the release point and, over time, spread it over an increasingly large area. However, observations also show high concentrations of the material even after significant spreading. This work examines a mechanism for creating such concentrations: downwelling of water at the boundaries of different water masses concentrates floating material at this boundary. Hundreds of satellite-tracked drifters were released near the site of the 2010 Deepwater Horizon oil spill. Surprisingly, most of these gathered into a single cluster less than 100 m in size, dramatically demonstrating the strength of this mechanism.

More Publications

Inventions

Open Water Detection from Beneath Sea Ice

Record of Invention Number: 47655

Eric D'Asaro, Andrey Shcherbina

Disclosure

16 Mar 2016

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
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