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Author
Morey, S. L. ; Wienders, N. ; Dukhovskoy, D. S. ; Bourassa, M. A.
Title
Impact of Stokes Drift on Measurements of Surface Currents from Drifters and HF Radar
Type
$loc['typeAbstract']
Year
2018
Publication
American Geophysical Union
Abbreviated Journal
AGU
Volume
Fall Meeting
Issue
Pages
Keywords
3307 Boundary layer processes, ATMOSPHERIC PROCESSESDE: 4504 Air/sea interactions, OCEANOGRAPHY: PHYSICALDE: 4560 Surface waves and tides, OCEANOGRAPHY: PHYSICALDE: 4572 Upper ocean and mixed layer processes, OCEANOGRAPHY: PHYSICAL
Abstract
Concurrent measurements by surface drifters of different configurations and HF radar reveal substantial differences in estimates of the near-surface seawater velocity. On average, speeds of small ultra-thin (5 cm) drifters are significantly greater than co-located drifters with a traditional shallow drogue design, while velocity measurements from the drogued drifters closely match HF radar velocity estimates. Analysis of directional wave spectra measurements from a nearby buoy reveals that Stokes drift accounts for much of the difference between the velocity measurements from the drogued drifters and the ultra-thin drifters, except during times of wave breaking. Under wave breaking conditions, the difference between the ultra-thin drifter velocity and the drogued drifter velocity is much less than the computed Stokes drift. The results suggest that surface currents measured by more common approaches or simulated in models may underrepresent the velocity at the very surface of the ocean that is important for determining momentum and enthalpy fluxes between the ocean and atmosphere and for estimating transport of material at the ocean surface. However, simply adding an estimate of Stokes drift may also not be an appropriate method for estimating the true surface velocity from models or measurements from drogued drifters or HF radar under all sea conditions.
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$loc['no']
Call Number
COAPS @ user @
Serial
1008
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Author
Lee, C.M. ; Starkweather, S. ; Eicken, H. ; Timmermans, M.-L. ; Wilkinson, J. ; Sandven, S. ; Dukhovskoy, D. ; Gerland, S. ; Grebmeier, J. ; Intrieri, J.M. ; Kang, S.-H. ; McCammon, M. ; Nguyen, A.T. ; Polyakov, I. ; Rabe, B. ; Sagen, H. ; Seeyave, S. ; Volkov, D. ; Beszczynska-Möller, A. ; Chafik, L. ; Dzieciuch, M. ; Goni, G. ; Hamre, T. ; King, A.L. ; Olsen, A. ; Raj, R.P. ; Rossby, T. ; Skagseth, Ø. ; Søiland, H. ; Sørensen, K.
Title
A Framework for the Development, Design and Implementation of a Sustained Arctic Ocean Observing System
Type
$loc['typeJournal Article']
Year
2019
Publication
Frontiers in Marine Science
Abbreviated Journal
Front. Mar. Sci.
Volume
6
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2296-7745
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$loc['no']
Call Number
COAPS @ user @
Serial
1044
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Author
Bashmachnikov, I.L. ; Fedorov, A.M. ; Vesman, A.V. ; Belonenko, T.V. ; Dukhovskoy, D.S.
Title
Thermohaline convection in the subpolar seas of the North Atlantic from satellite and in situ observations. Part 2: indices of intensity of deep convection
Type
$loc['typeJournal Article']
Year
2019
Publication
Abbreviated Journal
Volume
16
Issue
1
Pages
191-201
Keywords
deep convection, assimilation of satellite data, altimetry, water density, the Greenland Sea, the Labrador Sea, the Irminger Sea
Abstract
Variation in locations of the maximum development of deep convection in the subpolar seas, taking into account their small dimensions, represent difficulty in identifying its interannual variability from usually sparse in situ data. In this work, the interannual variability of the maximum convection depth, is obtained using one of the most complete datasets ARMOR, which combines in situ and satellite data. The convection depths, derived from ARMOR, are used for testing the efficiency of two indices of convection intensity: (1) sea-level anomalies from satellite altimetry and (2) the integral water density in the areas of the most frequent development of deep convection. The first index, capturing some details, shows low correlations with the interannual variability of the deep convection intensity. The second index shows high correlation with the deep convection intensity in the Greenland, Irminger and Labrador seas. Asynchronous variations in the deep convection intensity in the Labrador-Irminger seas and in the Greenland Sea are obtained. In the Labrador and in the Irminger seas, the quasi-seven-year variations in the convection intensity are identified.
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$loc['no']
Call Number
COAPS @ user @
Serial
1089
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