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  • 1
    Online-Ressource
    Online-Ressource
    The Royal Society ; 2023
    In:  Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences Vol. 381, No. 2249 ( 2023-06-26)
    In: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, The Royal Society, Vol. 381, No. 2249 ( 2023-06-26)
    Kurzfassung: The Southern Ocean greatly contributes to the regulation of the global climate by controlling important heat and carbon exchanges between the atmosphere and the ocean. Rates of climate change on decadal timescales are therefore impacted by oceanic processes taking place in the Southern Ocean, yet too little is known about these processes. Limitations come both from the lack of observations in this extreme environment and its inherent sensitivity to intermittent processes at scales that are not well captured in current Earth system models. The Southern Ocean Carbon and Heat Impact on Climate programme was launched to address this knowledge gap, with the overall objective to understand and quantify variability of heat and carbon budgets in the Southern Ocean through an investigation of the key physical processes controlling exchanges between the atmosphere, ocean and sea ice using a combination of observational and modelling approaches. Here, we provide a brief overview of the programme, as well as a summary of some of the scientific progress achieved during its first half. Advances range from new evidence of the importance of specific processes in Southern Ocean ventilation rate (e.g. storm-induced turbulence, sea–ice meltwater fronts, wind-induced gyre circulation, dense shelf water formation and abyssal mixing) to refined descriptions of the physical changes currently ongoing in the Southern Ocean and of their link with global climate. This article is part of a discussion meeting issue ‘Heat and carbon uptake in the Southern Ocean: the state of the art and future priorities’.
    Materialart: Online-Ressource
    ISSN: 1364-503X , 1471-2962
    RVK:
    Sprache: Englisch
    Verlag: The Royal Society
    Publikationsdatum: 2023
    ZDB Id: 208381-4
    ZDB Id: 1462626-3
    SSG: 11
    SSG: 5,1
    SSG: 5,21
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  • 2
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 35, No. 3 ( 2008-02-12)
    Materialart: Online-Ressource
    ISSN: 0094-8276
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2008
    ZDB Id: 2021599-X
    ZDB Id: 7403-2
    SSG: 16,13
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  • 3
    Online-Ressource
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    American Meteorological Society ; 2017
    In:  Journal of Physical Oceanography Vol. 47, No. 10 ( 2017-10), p. 2631-2646
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 47, No. 10 ( 2017-10), p. 2631-2646
    Kurzfassung: Data from a mooring array deployed north of Denmark Strait from September 2011 to August 2012 are used to investigate the structure and variability of the shelfbreak East Greenland Current (EGC). The shelfbreak EGC is a surface-intensified current situated just offshore of the east Greenland shelf break flowing southward through Denmark Strait. This study identified two dominant spatial modes of variability within the current: a pulsing mode and a meandering mode, both of which were most pronounced in fall and winter. A particularly energetic event in November 2011 was related to a reversal of the current for nearly a month. In addition to the seasonal signal, the current was associated with periods of enhanced eddy kinetic energy and increased variability on shorter time scales. The data indicate that the current is, for the most part, barotropically stable but subject to baroclinic instability from September to March. By contrast, in summer the current is mainly confined to the shelf break with decreased eddy kinetic energy and minimal baroclinic conversion. No other region of the Nordic Seas displays higher levels of eddy kinetic energy than the shelfbreak EGC north of Denmark Strait during fall. This appears to be due to the large velocity variability on mesoscale time scales generated by the instabilities. The mesoscale variability documented here may be a source of the variability observed at the Denmark Strait sill.
    Materialart: Online-Ressource
    ISSN: 0022-3670 , 1520-0485
    Sprache: Unbekannt
    Verlag: American Meteorological Society
    Publikationsdatum: 2017
    ZDB Id: 2042184-9
    ZDB Id: 184162-2
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  • 4
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    American Geophysical Union (AGU) ; 2017
    In:  Journal of Geophysical Research: Oceans Vol. 122, No. 1 ( 2017-01), p. 93-109
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 122, No. 1 ( 2017-01), p. 93-109
    Kurzfassung: The southward freshwater transport north of Denmark Strait between 2011 and 2012 was 65 ± 11 mSv. An additional 19 mSv was present on the shelf The shelfbreak EGC carried nearly 70% of the freshwater and the separated EGC was responsible for 30% of the offshore freshwater transport The freshwater transport in September 2011 of 131 mSv amounted to an increase with 150% relative to the late‐1990s and early‐2000s
    Materialart: Online-Ressource
    ISSN: 2169-9275 , 2169-9291
    URL: Issue
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2017
    ZDB Id: 2016804-4
    ZDB Id: 161667-5
    ZDB Id: 3094219-6
    SSG: 16,13
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  • 5
    Online-Ressource
    Online-Ressource
    IOP Publishing ; 2009
    In:  IOP Conference Series: Earth and Environmental Science Vol. 6, No. 3 ( 2009-01-01), p. 032012-
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 6, No. 3 ( 2009-01-01), p. 032012-
    Materialart: Online-Ressource
    ISSN: 1755-1315
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2009
    ZDB Id: 2434538-6
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Online-Ressource
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    Copernicus GmbH ; 2010
    In:  Ocean Science Vol. 6, No. 4 ( 2010-12-13), p. 1013-1026
    In: Ocean Science, Copernicus GmbH, Vol. 6, No. 4 ( 2010-12-13), p. 1013-1026
    Kurzfassung: Abstract. The flow of Atlantic water across the Greenland-Scotland Ridge (Atlantic inflow) is critical for conditions in the Nordic Seas and Arctic Ocean by importing heat and salt. Here, we present a decade-long series of measurements from the Iceland-Faroe inflow branch (IF-inflow), which carries almost half the total Atlantic inflow. The observations show no significant trend in volume transport of Atlantic water, but temperature and salinity increased during the observational period. On shorter time scales, the observations show considerable variations but no statistically significant seasonal variation is observed and even weekly averaged transport values were consistently uni-directional from the Atlantic into the Nordic Seas. Combining transport time-series with sea level height from satellite altimetry and wind stress reveals that the force driving the IF-inflow across the topographic barrier of the Ridge is mainly generated by a pressure gradient that is due to a continuously maintained low sea level in the Southern Nordic Seas. This implies that the relative stability of the IF-inflow derives from the processes that lower the sea level by generating outflow from the Nordic Seas, especially the thermohaline processes that generate overflow. The IF-inflow is an important component of the system coupling the Arctic region to the North Atlantic through the thermohaline circulation, which has been predicted to weaken in the 21st century. Our observations show no indication of weakening.
    Materialart: Online-Ressource
    ISSN: 1812-0792
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2010
    ZDB Id: 2183769-7
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Online-Ressource
    Online-Ressource
    Copernicus GmbH ; 2016
    In:  Ocean Science Vol. 12, No. 2 ( 2016-04-13), p. 545-560
    In: Ocean Science, Copernicus GmbH, Vol. 12, No. 2 ( 2016-04-13), p. 545-560
    Kurzfassung: Abstract. The northern limb of the Atlantic thermohaline circulation and its transport of heat and salt towards the Arctic strongly modulate the climate of the Northern Hemisphere. The presence of warm surface waters prevents ice formation in parts of the Arctic Mediterranean, and ocean heat is directly available for sea-ice melt, while salt transport may be critical for the stability of the exchanges. Through these mechanisms, ocean heat and salt transports play a disproportionally strong role in the climate system, and realistic simulation is a requisite for reliable climate projections. Across the Greenland–Scotland Ridge (GSR) this occurs in three well-defined branches where anomalies in the warm and saline Atlantic inflow across the shallow Iceland–Faroe Ridge (IFR) have been shown to be particularly difficult to simulate in global ocean models. This branch (IF-inflow) carries about 40 % of the total ocean heat transport into the Arctic Mediterranean and is well constrained by observation during the last 2 decades but associated with significant inter-annual fluctuations. The inconsistency between model results and observational data is here explained by the inability of coarse-resolution models to simulate the overflow across the IFR (IF-overflow), which feeds back onto the simulated IF-inflow. In effect, this is reduced in the model to reflect only the net exchange across the IFR. Observational evidence is presented for a substantial and persistent IF-overflow and mechanisms that qualitatively control its intensity. Through this, we explain the main discrepancies between observed and simulated exchange. Our findings rebuild confidence in modelled net exchange across the IFR, but reveal that compensation of model deficiencies here through other exchange branches is not effective. This implies that simulated ocean heat transport to the Arctic is biased low by more than 10 % and associated with a reduced level of variability, while the quality of the simulated salt transport becomes critically dependent on the link between IF-inflow and IF-overflow. These features likely affect sensitivity and stability of climate models to climate change and limit the predictive skill.
    Materialart: Online-Ressource
    ISSN: 1812-0792
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2016
    ZDB Id: 2183769-7
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  • 8
    Online-Ressource
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    American Geophysical Union (AGU) ; 2018
    In:  Journal of Geophysical Research: Oceans Vol. 123, No. 5 ( 2018-05), p. 3186-3203
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 123, No. 5 ( 2018-05), p. 3186-3203
    Kurzfassung: Ice Shelf Water overflow is related to wind variability along the continental slope upstream of Filchner Trough Monthly scale variability in the slope current and Antarctic Coastal Current is strongly linked to the alongslope wind variability
    Materialart: Online-Ressource
    ISSN: 2169-9275 , 2169-9291
    URL: Issue
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2018
    ZDB Id: 2016804-4
    ZDB Id: 161667-5
    ZDB Id: 3094219-6
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Online-Ressource
    Online-Ressource
    Elsevier BV ; 2000
    In:  Deep Sea Research Part I: Oceanographic Research Papers Vol. 47, No. 4 ( 2000-4), p. 655-680
    In: Deep Sea Research Part I: Oceanographic Research Papers, Elsevier BV, Vol. 47, No. 4 ( 2000-4), p. 655-680
    Materialart: Online-Ressource
    ISSN: 0967-0637
    Sprache: Englisch
    Verlag: Elsevier BV
    Publikationsdatum: 2000
    ZDB Id: 1500309-7
    ZDB Id: 1146810-5
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    Online-Ressource
    Online-Ressource
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Oceans Vol. 106, No. C6 ( 2001-06-15), p. 11481-11492
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 106, No. C6 ( 2001-06-15), p. 11481-11492
    Kurzfassung: We have made oceanographic measurements at two sites beneath the southern Filchner‐Ronne Ice Shelf. Hot‐water drilled access holes were made during January 1999, allowing conductivity‐temperature‐depth (CTD) profiling and the deployment of instrument moorings. The CTD profiles show that the entire water column is below the surface freezing point. We estimate the (summer) flux of water between the two sites to be 2×10 6 m 3 s −1 . The summer potential temperature‐salinity properties of the water column suggest that this flow is part of a recirculation in the deepest part of the subice shelf cavity and the Filchner Depression. The recirculation is driven by a combination of the melting of deep basal ice and the freezing that results from the depressurization of the cold buoyant water as it ascends the ice shelf base. The source of the water was high‐salinity shelf water (HSSW) produced in the Ronne Depression. This is the water that provides the external heat necessary for the strong melting at the deep grounding lines in the vicinity of Foundation Ice Stream. Instruments moored at the drill sites show that during the winter HSSW formed on the Berkner Shelf flows beneath the ice shelf and largely displaces the recirculating water from the two sites. This provides an externally driven through flow that is warmer (nearer the surface freezing point) and slower than the internal recirculation and which is low enough in density to escape the Filchner Depression.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2001
    ZDB Id: 2033040-6
    ZDB Id: 3094104-0
    ZDB Id: 2130824-X
    ZDB Id: 2016813-5
    ZDB Id: 2016810-X
    ZDB Id: 2403298-0
    ZDB Id: 2016800-7
    ZDB Id: 161666-3
    ZDB Id: 161667-5
    ZDB Id: 2969341-X
    ZDB Id: 161665-1
    ZDB Id: 3094268-8
    ZDB Id: 710256-2
    ZDB Id: 2016804-4
    ZDB Id: 3094181-7
    ZDB Id: 3094219-6
    ZDB Id: 3094167-2
    ZDB Id: 2220777-6
    ZDB Id: 3094197-0
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
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