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James Morison, Ron Kwok, Suzanne Dickinson, Roger Andersen, Cecilia Peralta-Ferriz, David Morison, Ignatius Rigor, Sarah Dewey, and John Guthrie

1. Introduction Present Arctic Ocean near-surface circulation is commonly characterized as being in an anticyclonic phase ( Hofmann et al. 2015 ; McPhee et al. 2009 ; Proshutinsky et al. 2015 , 2009 ). This idea is largely based on in situ observations in the Canada Basin that are biased toward measuring the intensity of the anticyclonic Beaufort Gyre and on a regional index of Arctic Ocean circulation, the Arctic Ocean Oscillation index (AOOI). The AOOI is the sea surface height gradient

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Miles G. McPhee

870 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME I0A Study of Oceanic Boundary-Layer Characteristics Including Inertial Oscillation at Three Drifting Stations in I~he Arctic OceanMILES G. McPnEEu.s. Army Cold Regions Research and Engineering Laboratory, Hanover, NH 05?55(Manuscript received 3 September 1979, in final form 4 February 1980) ABSTRACT Measurements of

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Sarah R. Dewey, James H. Morison, and Jinlun Zhang

.1029/2010JC006803 Thompson , D. W. J. , and J. M. Wallace , 1998 : The Arctic Oscillation signature in the wintertime geopotential height and temperature fields . Geophys. Res. Lett. , 25 , 1297 – 1300 , doi: 10.1029/98GL00950 . 10.1029/98GL00950 Timokhov , L. , and F. Tanis , Eds., 1997 : Environmental Working Group Joint U.S.-Russian Atlas of the Arctic Ocean, version 1. National Snow and Ice Data Center, CD-ROM, doi: 10.7265/N5H12ZX4 . 10.7265/N5H12ZX4 Toole , J. M. , M.-L. Timmermans

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Antonio Espejo, Paula Camus, Iñigo J. Losada, and Fernando J. Méndez

understanding of the local behavior of a wide range of geophysical variables and its relation with synoptic-scale atmospheric circulation patterns. Nowadays, most of the climatic oscillating modes like ENSO, the Arctic Oscillation (AO), and others are obtained by means of principal component analysis (PCA), which is especially useful in reducing the dimensionality of complex spatial patterns like, for example, the sea level pressure (SLP) fields in the North Atlantic (NA). This linear approach assumes that

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Gianluca Meneghello, John Marshall, Mary-Louise Timmermans, and Jeffery Scott

1. Introduction Ekman pumping plays a central role in the generation and maintenance of the Beaufort Gyre (BG), the largest freshwater reservoir in the Arctic ( Proshutinsky et al. 2009 ). The pumping rates are proportional to the curl of the surface stress, with the stress being a combination of the winds’ effect over the open ocean, and of the ice—itself driven by the wind—moving over the ice-covered ocean. Most estimates of Ekman pumping assume that surface ocean geostrophic currents can be

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Murray D. Levine, Clayton A. Paulson, and James H. Morison

was moored below the pack ice from 50-150 m in the Arctic Ocean for five days in198 I. Oscillations in temperature are attributed to the vertical displacement of internal wave~ The spectralshape of isotherm displacement is consistent with the Garrett-Munk raodel and other internal waveobservations, but the spectral level is significantly lower. Other observations from the Arctic Ocean alsoexhibit lower internal-wave energy when compared with historical data from lower latitudes. The lowerener

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R. W. Lindsay and J. Zhang

constructs, but some physical interpretation can be obtained by seeing how well these components correlate with the dominant mode of atmospheric variability for the Northern Hemisphere. The winter (October–January) mean Arctic Oscillation index (AO; Thompson and Wallace 1998 ) is also shown in Fig. 7 as well as the lagged correlations of each PC with the AO. Only the second and third PCs show a significant correlation, greatest at a half-year lag, which is for the ice thickness in the calendar year

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Andrew M. Moore and Christopher J. C. Reason

the model causes the model equilibrium stateto change, The transition between equilibrium states is smooth and no persistent thermohaline oscillations areexcited,- which disagrees with the findings of other investigators. Persistent oscillations could only be excited inthe model if the realistic ocean bathymetry was replaced by a flat bottom everywhere, in which case an oscillationwith a lO-year p~tiod was excited in the North Atlantic sector of the Arctic Ocean.1. Introduction In recent years

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Kim I. Martini, Harper L. Simmons, Chase A. Stoudt, and Jennifer K. Hutchings

the 12.42-h M 2 and the 12-h S 2 semidiurnal tides. Therefore, it can be difficult to distinguish wind-generated near-inertial oscillations from semidiurnal tides. Tidal velocity is estimated from ADCP and MMP data by fitting semidiurnal tidal constituents to the entire data record. Fitted tidal velocities are somewhat smaller than Arctic tidal models, having maximum semidiurnal velocities of 0.01 and 0.02 m s −1 ( Kowalik and Proshutinsky 1994 ; Padman and Erofeeva 2004 ), respectively. These

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Ilker Fer

smoothed over approximately 20 m in depth and 6 h in time. Positive values indicate cyclonic rotation when viewed from above. 6. Concluding remarks Observations of horizontal currents, hydrography, and shear microstructure are reported from the central Arctic Ocean, collected from a drift about 10 days after a storm event and severe ice deformation period. Near-inertial frequency band motions appear in shear and strain. The near-inertial oscillations are most pronounced early in the measurement period

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