Thematische Bibliographien / Greenland-Scotland Ridge

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Auswahl der wissenschaftlichen Literatur zum Thema „Greenland-Scotland Ridge“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 12. Februar 2022

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Zeitschriftenartikel zum Thema "Greenland-Scotland Ridge"

Bringedal, Carina, Tor Eldevik, Øystein Skagseth, Michael A. Spall und Svein Østerhus. „Structure and Forcing of Observed Exchanges across the Greenland–Scotland Ridge“. Journal of Climate 31, Nr. 24 (Dezember 2018): 9881–901. http://dx.doi.org/10.1175/jcli-d-17-0889.1.

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The Atlantic meridional overturning circulation and associated poleward heat transport are balanced by northern heat loss to the atmosphere and corresponding water-mass transformation. The circulation of northward-flowing Atlantic Water at the surface and returning overflow water at depth is particularly manifested—and observed—at the Greenland–Scotland Ridge where the water masses are guided through narrow straits. There is, however, a rich variability in the exchange of water masses across the ridge on all time scales. Focusing on seasonal and interannual time scales, and particularly the gateways of the Denmark Strait and between the Faroe Islands and Shetland, we specifically assess to what extent the exchanges of water masses across the Greenland–Scotland Ridge relate to wind forcing. On seasonal time scales, the variance explained of the observed exchanges can largely be related to large-scale wind patterns, and a conceptual model shows how this wind forcing can manifest via a barotropic, cyclonic circulation. On interannual time scales, the wind stress impact is less direct as baroclinic mechanisms gain importance and observations indicate a shift in the overflows from being more barotropically to more baroclinically forced during the observation period. Overall, the observed Greenland–Scotland Ridge exchanges reflect a horizontal (cyclonic) circulation on seasonal time scales, while the interannual variability more represents an overturning circulation.

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Beaird, Nicholas, Ilker Fer, Peter Rhines und Charles Eriksen. „Dissipation of Turbulent Kinetic Energy Inferred from Seagliders: An Application to the Eastern Nordic Seas Overflows“. Journal of Physical Oceanography 42, Nr. 12 (01.12.2012): 2268–82. http://dx.doi.org/10.1175/jpo-d-12-094.1.

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Abstract Turbulent mixing is an important process controlling the descent rate, water mass modification, and volume transport augmentation due to entrainment in the dense overflows across the Greenland–Scotland Ridge. These overflows, along with entrained Atlantic waters, form a major portion of the North Atlantic Deep Water, which pervades the abyssal ocean. Three years of Seaglider observations of the overflows across the eastern Greenland–Scotland Ridge are leveraged to map the distribution of dissipation of turbulent kinetic energy on the Iceland–Faroe Ridge. A method has been applied using the finescale vertical velocity and density measurements from the glider to infer dissipation. The method, termed the large-eddy method (LEM), is compared with a microstructure survey of the Faroe Bank Channel (FBC). The LEM reproduces the patterns of dissipation observed in the microstructure survey, which vary over several orders of magnitude. Agreement between the inferred LEM and more direct microstructure measurements is within a factor of 2. Application to the 9432 dives that encountered overflow waters on the Iceland–Faroe Ridge reveals three regions of enhanced dissipation: one downstream of the primary FBC sill, another downstream of the secondary FBC sill, and a final region in a narrow jet of overflow along the Iceland shelf break.

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Uenzelmann-Neben, Gabriele, und Jens Gruetzner. „Chronology of Greenland Scotland Ridge overflow: What do we really know?“ Marine Geology 406 (Dezember 2018): 109–18. http://dx.doi.org/10.1016/j.margeo.2018.09.008.

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Biastoch, Arne, Rolf H. Käse und Detlef B. Stammer. „The Sensitivity of the Greenland–Scotland Ridge Overflow to Forcing Changes“. Journal of Physical Oceanography 33, Nr. 11 (November 2003): 2307–19. http://dx.doi.org/10.1175/1520-0485(2003)033<2307:tsotgr>2.0.co;2.

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Olsen, Steffen M., Bogi Hansen, Detlef Quadfasel und Svein Østerhus. „Observed and modelled stability of overflow across the Greenland–Scotland ridge“. Nature 455, Nr. 7212 (September 2008): 519–22. http://dx.doi.org/10.1038/nature07302.

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Rheinlænder, Jonathan W., David Ferreira und Kerim H. Nisancioglu. „Topological Constraints by the Greenland–Scotland Ridge on AMOC and Climate“. Journal of Climate 33, Nr. 13 (01.07.2020): 5393–411. http://dx.doi.org/10.1175/jcli-d-19-0726.1.

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AbstractChanges in the geometry of ocean basins have been influential in driving climate change throughout Earth’s history. Here, we focus on the emergence of the Greenland–Scotland Ridge (GSR) and its influence on the ocean state, including large-scale circulation, heat transport, water mass properties, and global climate. Using a coupled atmosphere–ocean–sea ice model, we consider the impact of introducing the GSR in an idealized Earth-like geometry, comprising a narrow Atlantic-like basin and a wide Pacific-like basin. Without the GSR, deep-water formation occurs near the North Pole in the Atlantic basin, associated with a deep meridional overturning circulation (MOC). By introducing the GSR, the volume transport across the sill decreases by 64% and deep convection shifts south of the GSR, dramatically altering the structure of the high-latitude MOC. Due to compensation by the subpolar gyre, the northward ocean heat transport across the GSR only decreases by ~30%. As in the modern Atlantic Ocean, a bidirectional circulation regime is established with warm Atlantic water inflow and a cold dense overflow across the GSR. In sharp contrast to the large changes north of the GSR, the strength of the Atlantic MOC south of the GSR is unaffected. Outside the high latitudes of the Atlantic basin, the surface climate response is surprisingly small, suggesting that the GSR has little impact on global climate. Our results suggest that caution is required when interpreting paleoproxy and ocean records, which may record large local changes, as indicators of basin-scale changes in the overturning circulation and global climate.

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Olsen, Steffen Malskcer, B. Hansen, D. Quadfasel und S. Østerhus. „Stability of the overflow across the Greenland-Scotland Ridge since 1948“. IOP Conference Series: Earth and Environmental Science 6, Nr. 3 (01.01.2009): 032017. http://dx.doi.org/10.1088/1755-1307/6/3/032017.

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Poore, H. R., R. Samworth, N. J. White, S. M. Jones und I. N. McCave. „Neogene overflow of Northern Component Water at the Greenland-Scotland Ridge“. Geochemistry, Geophysics, Geosystems 7, Nr. 6 (Juni 2006): n/a. http://dx.doi.org/10.1029/2005gc001085.

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Jensen, Mari F., Kerim H. Nisancioglu und Michael A. Spall. „Large Changes in Sea Ice Triggered by Small Changes in Atlantic Water Temperature“. Journal of Climate 31, Nr. 12 (Juni 2018): 4847–63. http://dx.doi.org/10.1175/jcli-d-17-0802.1.

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The sensitivity of sea ice to the temperature of inflowing Atlantic water across the Greenland–Scotland Ridge is investigated using an eddy-resolving configuration of the Massachusetts Institute of Technology General Circulation Model with idealized topography. During the last glacial period, when climate on Greenland is known to have been extremely unstable, sea ice is thought to have covered the Nordic seas. The dramatic excursions in climate during this period, seen as large abrupt warming events on Greenland and known as Dansgaard–Oeschger (DO) events, are proposed to have been caused by a rapid retreat of Nordic seas sea ice. Here, we show that a full sea ice cover and Arctic-like stratification can exist in the Nordic seas given a sufficiently cold Atlantic inflow and corresponding low transport of heat across the Greenland–Scotland Ridge. Once sea ice is established, continued sea ice formation and melt efficiently freshens the surface ocean and makes the deeper layers more saline. This creates a strong salinity stratification in the Nordic seas, similar to today’s Arctic Ocean, with a cold fresh surface layer protecting the overlying sea ice from the warm Atlantic water below. There is a nonlinear response in Nordic seas sea ice to Atlantic water temperature with simulated large abrupt changes in sea ice given small changes in inflowing temperature. This suggests that the DO events were more likely to have occurred during periods of reduced warm Atlantic water inflow to the Nordic seas.

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Wright, James D., und Kenneth G. Miller. „Control of North Atlantic Deep Water Circulation by the Greenland-Scotland Ridge“. Paleoceanography 11, Nr. 2 (April 1996): 157–70. http://dx.doi.org/10.1029/95pa03696.

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Dissertationen zum Thema "Greenland-Scotland Ridge"

More, Colin. „The role of North Atlantic Current water in exchanges across the Greenland-Scotland Ridge from the Nordic Seas“. Master's thesis, 2011. http://hdl.handle.net/10048/1681.

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The circulation and gradual transformation in properties of oceanic water masses is a matter of great interest for short-term weather and biological forecasting, as well as long-term climate change. It is usually agreed that the Nordic Seas between Greenland and Norway are key to these transformations since they are an important producer of dense water, a process central to the theory of the global thermohaline circulation. In this study, one component of this deep water is examined – that formed in the Nordic Seas themselves from the inflowing North Atlantic Current. Using Lagrangian particle tracking applied to a 50-year global ocean hindcast simulation, it is concluded that only about 6% of the inflowing North Atlantic Current is thus transformed, and that most of these transformations occur in boundary currents. Furthermore, it is found that the densified North Atlantic water attains only medium depths instead of joining the deep overflows. The model’s poor representation of vertical mixing, however, limits the applicability of this study to deep water formation.

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Bücher zum Thema "Greenland-Scotland Ridge"

Structure and Development of the Greenland-Scotland Ridge: New Methods and Concepts. Springer, 2013.

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Buchteile zum Thema "Greenland-Scotland Ridge"

Jungclaus, Johann H., Andreas Macrander und Rolf H. Käse. „Modelling the Overflows Across the Greenland–Scotland Ridge“. In Arctic–Subarctic Ocean Fluxes, 527–49. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6774-7_23.

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Hansen, Bogi, Svein Østerhus, William R. Turrell, Steingrímur Jónsson, Héðinn Valdimarsson, Hjálmar Hátún und Steffen Malskær Olsen. „The Inflow of Atlantic Water, Heat, and Salt to the Nordic Seas Across the Greenland–Scotland Ridge“. In Arctic–Subarctic Ocean Fluxes, 15–43. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6774-7_2.

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