Bibliografie tematiche / Beaufort Gyre

Letteratura scientifica selezionata sul tema "Beaufort Gyre"

Autore: Grafiati

Pubblicato: 25 maggio 2024

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Articoli di riviste sul tema "Beaufort Gyre":

Meneghello, Gianluca, Edward Doddridge, John Marshall, Jeffery Scott e Jean-Michel Campin. "Exploring the Role of the “Ice–Ocean Governor” and Mesoscale Eddies in the Equilibration of the Beaufort Gyre: Lessons from Observations". Journal of Physical Oceanography 50, n. 1 (gennaio 2020): 269–77. http://dx.doi.org/10.1175/jpo-d-18-0223.1.

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AbstractObservations of Ekman pumping, sea surface height anomaly, and isohaline depth anomaly over the Beaufort Gyre are used to explore the relative importance and role of (i) feedbacks between ice and ocean currents, dubbed the “ice–ocean governor,” and (ii) mesoscale eddy processes in the equilibration of the Beaufort Gyre. A two-layer model of the gyre is fit to observations and used to explore the mechanisms governing the gyre evolution from the monthly to the decennial time scale. The ice–ocean governor dominates the response on interannual time scales, with eddy processes becoming evident only on the longest, decadal time scales.

Meneghello, Gianluca, John Marshall, Mary-Louise Timmermans e Jeffery Scott. "Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice". Journal of Physical Oceanography 48, n. 4 (aprile 2018): 795–805. http://dx.doi.org/10.1175/jpo-d-17-0188.1.

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AbstractWe present observational estimates of Ekman pumping in the Beaufort Gyre region. Averaged over the Canada Basin, the results show a 2003–14 average of 2.3 m yr−1 downward with strong seasonal and interannual variability superimposed: monthly and yearly means range from 30 m yr−1 downward to 10 m yr−1 upward. A clear, seasonal cycle is evident with intense downwelling in autumn and upwelling during the winter months, despite the wind forcing being downwelling favorable year-round. Wintertime upwelling is associated with friction between the large-scale Beaufort Gyre ocean circulation and the surface ice pack and contrasts with previous estimates of yearlong downwelling; as a consequence, the yearly cumulative Ekman pumping over the gyre is significantly reduced. The spatial distribution of Ekman pumping is also modified, with the Beaufort Gyre region showing alternating, moderate upwelling and downwelling, while a more intense, yearlong downwelling averaging 18 m yr−1 is identified in the northern Chukchi Sea region. Implications of the results for understanding Arctic Ocean dynamics and change are discussed.

Manucharyan, Georgy E., Michael A. Spall e Andrew F. Thompson. "A Theory of the Wind-Driven Beaufort Gyre Variability". Journal of Physical Oceanography 46, n. 11 (novembre 2016): 3263–78. http://dx.doi.org/10.1175/jpo-d-16-0091.1.

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AbstractThe halocline of the Beaufort Gyre varies significantly on interannual to decadal time scales, affecting the freshwater content (FWC) of the Arctic Ocean. This study explores the role of eddies in the Ekman-driven gyre variability. Following the transformed Eulerian-mean paradigm, the authors develop a theory that links the FWC variability to the stability of the large-scale gyre, defined as the inverse of its equilibration time. The theory, verified with eddy-resolving numerical simulations, demonstrates that the gyre stability is explicitly controlled by the mesoscale eddy diffusivity. An accurate representation of the halocline dynamics requires the eddy diffusivity of 300 ± 200 m2 s−1, which is lower than what is used in most low-resolution climate models. In particular, on interannual and longer time scales the eddy fluxes and the Ekman pumping provide equally important contributions to the FWC variability. However, only large-scale Ekman pumping patterns can significantly alter the FWC, with spatially localized perturbations being an order of magnitude less efficient. Lastly, the authors introduce a novel FWC tendency diagnostic—the Gyre Index—that can be conveniently calculated using observations located only along the gyre boundaries. Its strong predictive capabilities, assessed in the eddy-resolving model forced by stochastic winds, suggest that the Gyre Index would be of use in interpreting FWC evolution in observations as well as in numerical models.

Zhong, Wenli, e Jinping Zhao. "Deepening of the Atlantic Water Core in the Canada Basin in 2003–11". Journal of Physical Oceanography 44, n. 9 (1 settembre 2014): 2353–69. http://dx.doi.org/10.1175/jpo-d-13-084.1.

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Abstract In 2004, a cold mode of Atlantic Water (AW) entered the western Canada basin, replacing the anomalously warm AW that resided in the basin since the 1990s. This slightly colder AW was denser than the 1990s warm mode; it gradually filled most of the western basin by 2009. The enhanced surface stress curl led to the spinup of the Beaufort Gyre and convergence of freshwater. The spinup also resulted in a deepening of the AW core at the center of the gyre and in shoaling of the AW core at the margins of the gyre. The density versus depth relationship revealed in this study shows that the depth of the maximum AW temperature was mainly controlled by the density structure before 2007; thus, it is the case when the denser water was deeper and the case when the lighter water was shallower around the basin. However, this relationship was reversed to become the case when the denser water was shallower and the case when the lighter water was deeper since 2008 inside the Beaufort Gyre. The combined effect of density and sea ice retreat that enhanced surface stress curl determined the depth of the AW inside the Beaufort Gyre since 2008. The deepening of the AW core and expanding of the area where the AW deepening occurred had a profound effect on the large-scale circulation in the Arctic Ocean.

Davis, Peter E. D., Camille Lique e Helen L. Johnson. "On the Link between Arctic Sea Ice Decline and the Freshwater Content of the Beaufort Gyre: Insights from a Simple Process Model". Journal of Climate 27, n. 21 (24 ottobre 2014): 8170–84. http://dx.doi.org/10.1175/jcli-d-14-00090.1.

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Abstract Recent satellite and hydrographic observations have shown that the rate of freshwater accumulation in the Beaufort Gyre of the Arctic Ocean has accelerated over the past decade. This acceleration has coincided with the dramatic decline observed in Arctic sea ice cover, which is expected to modify the efficiency of momentum transfer into the upper ocean. Here, a simple process model is used to investigate the dynamical response of the Beaufort Gyre to the changing efficiency of momentum transfer, and its link with the enhanced accumulation of freshwater. A linear relationship is found between the annual mean momentum flux and the amount of freshwater accumulated in the Beaufort Gyre. In the model, both the response time scale and the total quantity of freshwater accumulated are determined by a balance between Ekman pumping and an eddy-induced volume flux toward the boundary, highlighting the importance of eddies in the adjustment of the Arctic Ocean to a change in forcing. When the seasonal cycle in the efficiency of momentum transfer is modified (but the annual mean momentum flux is held constant), it has no effect on the accumulation of freshwater, although it does impact the timing and amplitude of the annual cycle in Beaufort Gyre freshwater content. This suggests that the decline in Arctic sea ice cover may have an impact on the magnitude and seasonality of the freshwater export into the North Atlantic.

Regan, Heather, Camille Lique, Claude Talandier e Gianluca Meneghello. "Response of Total and Eddy Kinetic Energy to the Recent Spinup of the Beaufort Gyre". Journal of Physical Oceanography 50, n. 3 (marzo 2020): 575–94. http://dx.doi.org/10.1175/jpo-d-19-0234.1.

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AbstractThe Beaufort Gyre in the Arctic Ocean has spun up over the past two decades in response to changes of the wind forcing and sea ice conditions, accumulating a significant amount of freshwater. Here a simulation performed with a high-resolution, eddy-resolving model is analyzed in order to provide a detailed description of the total and eddy kinetic energy and their response to this spinup of the gyre. On average, and in contrast to the typical open ocean conditions, the levels of mean and eddy kinetic energy are of the same order of magnitude, and the eddy kinetic energy is only intensified along the boundary and in the subsurface. In response to the strong anomalous atmospheric conditions in 2007, the gyre spins up and the mean kinetic energy almost doubles, while the eddy kinetic energy does not increase significantly for a long time period. This is because the isopycnals are able to flatten and the gyre expands outwards, reducing the potential for baroclinic instability. These results have implications for understanding the mechanisms at play for equilibrating the Beaufort Gyre and the variability and future changes of the Arctic freshwater system.

Plueddemann, A. J., R. Krishfield, T. Takizawa, K. Hatakeyama e S. Honjo. "Upper ocean velocities in the Beaufort Gyre". Geophysical Research Letters 25, n. 2 (15 gennaio 1998): 183–86. http://dx.doi.org/10.1029/97gl53638.

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Vazquez, Heriberto J., Bruce D. Cornuelle, Peter F. Worcester e Matthew Dzieciuch. "Ocean acoustic tomography in the Beaufort Gyre". Journal of the Acoustical Society of America 152, n. 4 (ottobre 2022): A110. http://dx.doi.org/10.1121/10.0015713.

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An ocean acoustic tomography array with a radius of 150 km was installed in the central Beaufort Gyre during 2016–2017 for the Canada Basin Acoustic Propagation Experiment (CANAPE). Five transceivers were deployed in a pentagon shape with a sixth transceiver at the center and a long vertical receiving array northwest of the central mooring. At least 12 refracted-surface-reflected (RSR) ray arrivals with lower turning points at depths between 500 and 3500 m were resolved in the acoustic receptions at all receivers. Travel-time anomalies were computed relative to a range-dependent sound-speed reference made by objectively interpolating annual-average sound-speed profiles constructed from the temperature data at each mooring. The travel time anomalies were inverted to estimate the 3-D sound-speed anomaly, including corrections to the positions of sources and receivers consistent with the uncertainty from long-baseline acoustic navigation systems at each mooring. Although the deep water in the Canada Basin is nearly homogeneous in temperature and salinity and highly stable (slowly warming in response to geothermal heating), it proved necessary to allow for a sound-speed change in the deep ocean to obtain consistent inversions, suggesting that the sound-speed equation at high pressure and low temperature is in error by about 0.1–0.2 ms−1.

Armitage, Thomas W. K., Sheldon Bacon, Andy L. Ridout, Alek A. Petty, Steven Wolbach e Michel Tsamados. "Arctic Ocean surface geostrophic circulation 2003–2014". Cryosphere 11, n. 4 (26 luglio 2017): 1767–80. http://dx.doi.org/10.5194/tc-11-1767-2017.

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Abstract. Monitoring the surface circulation of the ice-covered Arctic Ocean is generally limited in space, time or both. We present a new 12-year record of geostrophic currents at monthly resolution in the ice-covered and ice-free Arctic Ocean derived from satellite radar altimetry and characterise their seasonal to decadal variability from 2003 to 2014, a period of rapid environmental change in the Arctic. Geostrophic currents around the Arctic basin increased in the late 2000s, with the largest increases observed in summer. Currents in the southeastern Beaufort Gyre accelerated in late 2007 with higher current speeds sustained until 2011, after which they decreased to speeds representative of the period 2003–2006. The strength of the northwestward current in the southwest Beaufort Gyre more than doubled between 2003 and 2014. This pattern of changing currents is linked to shifting of the gyre circulation to the northwest during the time period. The Beaufort Gyre circulation and Fram Strait current are strongest in winter, modulated by the seasonal strength of the atmospheric circulation. We find high eddy kinetic energy (EKE) congruent with features of the seafloor bathymetry that are greater in winter than summer, and estimates of EKE and eddy diffusivity in the Beaufort Sea are consistent with those predicted from theoretical considerations. The variability of Arctic Ocean geostrophic circulation highlights the interplay between seasonally variable atmospheric forcing and ice conditions, on a backdrop of long-term changes to the Arctic sea ice–ocean system. Studies point to various mechanisms influencing the observed increase in Arctic Ocean surface stress, and hence geostrophic currents, in the 2000s – e.g. decreased ice concentration/thickness, changing atmospheric forcing, changing ice pack morphology; however, more work is needed to refine the representation of atmosphere–ice–ocean coupling in models before we can fully attribute causality to these increases.

Morison, James, Ron Kwok, Suzanne Dickinson, Roger Andersen, Cecilia Peralta-Ferriz, David Morison, Ignatius Rigor, Sarah Dewey e John Guthrie. "The Cyclonic Mode of Arctic Ocean Circulation". Journal of Physical Oceanography 51, n. 4 (aprile 2021): 1053–75. http://dx.doi.org/10.1175/jpo-d-20-0190.1.

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AbstractArctic Ocean surface circulation change should not be viewed as the strength of the anticyclonic Beaufort Gyre. While the Beaufort Gyre is a dominant feature of average Arctic Ocean surface circulation, empirical orthogonal function analysis of dynamic height (1950–89) and satellite altimetry–derived dynamic ocean topography (2004–19) show the primary pattern of variability in its cyclonic mode is dominated by a depression of the sea surface and cyclonic surface circulation on the Russian side of the Arctic Ocean. Changes in surface circulation after Arctic Oscillation (AO) maxima in 1989 and 2007–08 and after an AO minimum in 2010 indicate the cyclonic mode is forced by the AO with a lag of about 1 year. Associated with a one standard deviation increase in the average AO starting in the early 1990s, Arctic Ocean surface circulation underwent a cyclonic shift evidenced by increased spatial-average vorticity. Under increased AO, the cyclonic mode complex also includes increased export of sea ice and near-surface freshwater, a changed path of Eurasian runoff, a freshened Beaufort Sea, and weakened cold halocline layer that insulates sea ice from Atlantic water heat, an impact compounded by increased Atlantic Water inflow and cyclonic circulation at depth. The cyclonic mode’s connection with the AO is important because the AO is a major global scale climate index predicted to increase with global warming. Given the present bias in concentration of in situ measurements in the Beaufort Gyre and Transpolar Drift, a coordinated effort should be made to better observe the cyclonic mode.

Più fonti

Tesi sul tema "Beaufort Gyre":

Wilson, Ana Lisa. "Structure and dynamics of the thermohaline staircases in the Beaufort Gyre". Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Sep%5FWilson%5FAna.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, September 2007.
Thesis Advisor(s): Radko, Timour. "September 2007." Description based on title screen as viewed on October 25, 2007. Includes bibliographical references (p. 55-57). Also available in print.

Bertosio, Cécilia. "On the evolution of the halocline in the upper Arctic Ocean since 2007". Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS423.

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Dans l'océan Arctique, la stratification est déterminée par la salinité, contrairement aux océans des latitudes moyennes qui sont stratifiés par la température. En d'autres termes, en Arctique, les eaux salées se retrouvent au fond, même si elles sont plus chaudes. La halocline de l'océan Arctique correspond à une couche épaisse de 100-200m avec de forts gradients verticaux de salinité et est située entre 100 et 350m de profondeur. Elle s'insère entre la glace de mer située en surface et la couche relativement chaude des eaux Atlantiques. La halocline isole ainsi la glace du réservoir de chaleur contenu dans la couche Atlantique sous-jacente, et constitue un élément clé pour le maintien de la couverture de glace de mer. Durant cette thèse, nous avons étudié l'évolution de la halocline de l'océan Arctique depuis 2007, en utilisant plusieurs outils : des mesures hydrographiques obtenues à partir de plateformes dérivantes autonomes ou de campagnes en mer, et les simulations du modèle numérique de haute résolution spatiale (« PSY4 »)
In the Arctic Ocean, stratification is determined by salinity, unlike the mid-latitude oceans which are stratified by temperature. In other words, in the Arctic, salty water ends up at the bottom, even if it is warmer. The halocline of the Arctic Ocean is a 100-200m thick layer with strong vertical salinity gradients and is located between 100 and 350m depth. The halocline lies between the sea ice at the surface and the relatively warm Atlantic water. The halocline thus insulates the ice from the heat reservoir contained in the underlying Atlantic layer, and is a key element for the maintenance of the sea ice cover. During this thesis, we studied the evolution of the Arctic Ocean halocline since 2007, using several tools: hydrographic measurements obtained from autonomous drifting platforms or from sea campaigns, and high spatial resolution numerical model simulations ("PSY4")

McGeehan, Timothy P. "Investigation of 2-dimensional isotropy of under-ice roughness in the Beaufort Gyre and implications for mixed layer ocean turbulence". Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FMcGeehan.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, March 2008.
Thesis Advisor(s): Stanton, Timothy P. "March 2008." Description based on title screen as viewed on May 5, 2008. Includes bibliographical references (p. 72-74). Also available in print.

Libri sul tema "Beaufort Gyre":

W, Ostrom, e Woods Hole Oceanographic Institution, a cura di. Beaufort Gyre freshwater experiment: Deployment operations and technology 2003. Woods Hole, Mass: WHOI, 2004.

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J, Kemp, e Woods Hole Oceanographic Institution, a cura di. The Beaufort Gyre Observing System 2004: Mooring recovery and deployment operations in pack ice. [Woods Hole, Mass.]: Woods Hole Oceanographic Institution, 2005.

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McCormick, Michael E. Studies of sediment transport by Beaufort Gyre pack ice, 1992: Sediment, ice, & water data. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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W, Barnes Peter, e Geological Survey (U.S.), a cura di. Studies of sediment transported by Beaufort Gyre pack ice, Arctic Ocean, 1993: Concentrations, textural and carbon data. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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Studies of sediment transport by Beaufort Gyre pack ice, 1992: Sediment, ice, & water data. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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Capitoli di libri sul tema "Beaufort Gyre":

Carmack, Eddy, Fiona McLaughlin, Michiyo Yamamoto-Kawai, Motoyo Itoh, Koji Shimada, Richard Krishfield e Andrey Proshutinsky. "Freshwater Storage in the Northern Ocean and the Special Role of the Beaufort Gyre". In Arctic–Subarctic Ocean Fluxes, 145–69. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6774-7_8.

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Rapporti di organizzazioni sul tema "Beaufort Gyre":

Zhang, Jiaxu. The role of the Beaufort Gyre in Arctic and global climate variability: An eddy-permitting ocean-sea ice model perspective (w18_hilatbg). Office of Scientific and Technical Information (OSTI), febbraio 2019. http://dx.doi.org/10.2172/1498002.

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