Page 41: of Marine Technology Magazine (November 2018)
Acoustic Doppler Sonar Technologies ADCPs and DVLs
Fig. 7: Ocean-wide section of north/south currents in Subpolar N. Atlantic in 2016. Currents:
North(red), South(blue). Units: Depth(m), Distance(km).
Credit: Holliday et al. (2018) https://goo.gl/3YAE8X rial waters, East Paci? c Rise, Luzon Strait, South Paci? c, and
GREAT UNDER PRESSURE
Velocity pro? ling provides a ? ne-scale view of how ocean currents change with depth. The method began with special- ized teams and tools. Later compact ADCPs were lowered to the seabed. Over several years, a cooperative effort among ex- perts devised and re? ned the LADCP method and processing.
The Lowered ADCP has spread to be a standard technique used worldwide by the ocean research community. They have used it to lift the veil on deep currents from internal waves to jets, eddies, and undercurrents. And after three decades of gathering, full-depth LADCP velocity pro? les span the global ocean. They are being applied across a wide range of issues: from local to global in scope, and from days to decades in du- ration.
Fig. 3: M. Visbeck (2002) Deep velocity pro? ling using lowered Acous- tic Doppler Current Pro? ler: Bottom track and inverse solutions. DOI 10.1175/1520-0426(2002)019<0794:DVPULA>2.0.CO;2
Fig. 4: M.M. Hall, T.M. Joyce, R.S. Pickart, W.M. Smethie Jr., D.J. Torres (2004), Zonal circulation across 52°W in the North Atlantic. https://doi.org/10.1029/2003JC002103
Figs.5: L. M. Beal, and K. A. Donohue (2013), The Great Whirl: Observa- tions of its seasonal development and interannual variability. https://doi.
Fig. 7: N.P. Holliday, S. Bacon, S.A. Cunningham, S.F. Gary, J. Karstensen, B.A. King,
F. Li, E.L. Mcdonagh (2018), Subpolar North Atlantic Overturning and Gyre-Scale
Circulation in the Summers of 2014 and 2016. https://doi.org/10.1029/2018JC013841 www.marinetechnologynews.com
Marine Technology Reporter 41
MTR #9 (34-49).indd 41 MTR #9 (34-49).indd 41 11/27/2018 2:06:04 PM11/27/2018 2:06:04 PM