Journal: Journal of Physical Oceanography

Abbreviation

J. Phys. Oceanogr.

Publisher

American Meteorological Society

Journal Volumes

ISSN

0022-3670

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Publications 1 - 10 of 10
  • Double Diffusion in Saline Powell Lake, British Columbia
    Item type: Journal Article
    Scheifele, Benjamin; Pawlowicz, Rich; Sommer, Tobias; et al. (2014)
    Journal of Physical Oceanography
  • Transport by Lagrangian vortices in the eastern Pacific
    Item type: Journal Article
    Abernathey, Ryan; Haller, George (2018)
    Journal of Physical Oceanography
  • Freshwater Flux and Spatiotemporal Simulated Runoff Variability into Ilulissat Icefjord, West Greenland, Linked to Salinity and Temperature Observations near Tidewater Glacier Margins Obtained Using Instrumented Ringed Seals
    Item type: Journal Article
    Mernild, Sebastian H.; Holland, David M.; Holland, Denise; et al. (2015)
    Journal of Physical Oceanography
    The distribution of terrestrial surface runoff to Ilulissat Icefjord, west Greenland, is simulated for the period 2009–13 to better emphasize the spatiotemporal variability in freshwater flux and the link between runoff spikes and observed hydrographic conditions at the Greenland Ice Sheet tidewater glacier margins. Runoff model simulations were forced with automatic weather station data and verified against snow water equivalent depth, equilibrium line altitude, and quasi-continuous salinity and temperature observations obtained by ringed seals. Instrumented seals provide a novel platform to examine the otherwise inaccessible waters beneath the dense ice mélange within the first 0–10 km of the calving front. The estimated mean freshwater flux from land was 70.6 ± 4.2 km3 yr−1, with an 85% contribution of ice discharge from Jakobshavn Isbrae (also known as Sermeq Kujalleq), 14% from runoff, and the remaining 1% from precipitation on the fjord surface area, subglacial geothermal melting, and frictional melting due to basal ice motion. Runoff was simulated to be present from May to November and to vary spatially according to glacier cover and individual catchment size. Salinity and temperature observations correlate (significantly) with simulated runoff for the upper part of both the main fjord and southern fjord arm. Also, at the tidewater glacier margins in the northern and southern arm of Ilulissat Icefjord, salinity changes in the upper water column (upper 50 m) are significant after temporal spikes in runoff during late summer, while small-amplitude runoff variability during the recession of runoff did not create a clear signal in observed salinity variability. Also, in the southern arm near the glacier margin (between 100- and 150-m depth), the heterogeneous distribution in salinity could be because of the mixing of meltwater going upward from passing the grounding line. The effect of runoff spikes on observed salinity is less pronounced near the ice margin of Jakobshavn Isbrae than in the north and south arms.
  • Role of mesoscale eddies in cross-frontal transport of heat and biogeochemical tracers in the Southern Ocean
    Item type: Journal Article
    Dufour, Carolina O.; Griffies, Stephen M.; de Souza, Gregory F.; et al. (2015)
    Journal of Physical Oceanography
  • A numerical study of topographic wave reflection in semi-infinite channels
    Item type: Journal Article
    Stocker, Thomas (1988)
    Journal of Physical Oceanography
    The Potential vorticity equation describing topographic waves is approximately solved using the channel method of Stocker and Hutter. The domain of integration is a semi-infinite channel and models an estuary, the bathymetry of which is varied through a transverse and a longitudinal topography parameter. It is shown that in this domain the spectrum of topographic waves consists of a discrete and a continuous part. The former exhibits wave modes trapped at the closed end of the channel; these waves correspond to the bay modes in a rectangular basin. Resonances with a similar bay-trapped structure also occur in the continuous spectrum. Their dependence on the bay geometry is studied. A consistent explanation of the three topographic wave types found earlier in an enclosed basin is given in terms of topographic wave reflections.
  • Stability of a Double-Diffusive Interface in the Diffusive Convection Regime
    Item type: Journal Article
    Carpenter, J. R.; Sommer, T.; Wüest, A. (2012)
    Journal of Physical Oceanography
  • Machine-Learning Mesoscale and Submesoscale Surface Dynamics from Lagrangian Ocean Drifter Trajectories
    Item type: Journal Article
    Aksamit, Nikolas O.; Sapsis, Themistoklis; Haller, George (2020)
    Journal of Physical Oceanography
  • The Impact of Cold-Air Outbreaks and Oceanic Lateral Fluxes on Dense-Water Formation in the Greenland Sea from a 10-Year Moored Record (1999-2009)
    Item type: Journal Article
    Svingen, Kristin; Brakstad, Ailin; Våge, Kjetil; et al. (2023)
    Journal of Physical Oceanography
    The Greenland Sea produces a significant portion of the dense water from the Nordic seas that supplies the lower limb of the Atlantic meridional overturning circulation. Here, we use a continuous 10-yr hydrographic record from moored profilers to examine dense-water formation in the central Greenland Sea between 1999 and 2009. Of primary im-portance for dense-water formation is air-sea heat exchange, and 60%-80% of the heat lost to the atmosphere during win-ter occurs during intense, short-lived events called cold-air outbreaks (CAOs). The long duration and high temporal resolution of the moored record has for the first time facilitated a statistical quantification of the direct impact of CAOs on the wintertime mixed layer in the Greenland Sea. The mixed layer development can be divided into two phases: a cooling phase and a deepening phase. During the cooling phase (typically between November and January), CAOs cooled the mixed layer by up to 0.08 K day-1, depending on the intensity of the events, while the mixed layer depth remained nearly constant. Later in winter (February-April), heat fluxes during CAOs primarily led to mixed layer deepening of up to 38 m day-1. Considerable variability was observed in the mixed layer response, indicating that lateral fluxes of heat and salt were also important. The magnitude and vertical distributions of these fluxes were quantified, and idealized mixed layer simulations suggest that their combined effect is a reduction in the mixed layer depth at the end of winter of up to several hundred meters.
  • The force balance of the Southern Ocean meridional overturning circulation
    Item type: Journal Article
    Mazloff, Matthew R.; Ferrari, Raffaele; Schneider, Tapio (2013)
    Journal of Physical Oceanography
  • Objective detection of oceanic eddies and the Agulhas leakage
    Item type: Journal Article
    Beron-Vera, Francisco J.; Wang, Yan; Olascoaga, María J.; et al. (2013)
    Journal of Physical Oceanography
Publications 1 - 10 of 10