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  • PANGAEA  (386)
  • Wiley  (3)
  • Springer Nature  (2)
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  • 1
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    Drifters reveal deep circulation (2000)
    Springer Nature
    Details
    Publication Date: 2000-09-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 2
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    Surprisingly rapid spreading of newly formed intermediate waters across the North Atlantic Ocean (1997)
    Springer Nature
    Details
    Publication Date: 1997-04-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 3
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    Flow paths and variability of the North Atlantic Current: A comparison of observations and a high-resolution model (2017)
    AGU (American Geophysical Union) | Wiley
    In:  Journal of Geophysical Research: Oceans, 122 (4). 2686-2708 .
    Details
    Publication Date: 2020-02-06
    Description: The North Atlantic Current (NAC) is subject to variability on multiannual to decadal time scales, influencing the transport of volume, heat, and freshwater from the subtropical to the eastern subpolar North Atlantic (NA). Current observational time series are either too short or too episodic to study the processes involved. Here we compare the observed continuous NAC transport time series at the western flank of the Mid-Atlantic Ridge (MAR) and repeat hydrographic measurements at the OVIDE line in the eastern Atlantic with the NAC transport and circulation in the high-resolution (1/20°) ocean model configuration VIKING20 (1960–2008). The modeled baroclinic NAC transport relative to 3400 m (24.5 ± 7.1 Sv) at the MAR is only slightly lower than the observed baroclinic mean of 27.4 ± 4.7 Sv from 1993 to 2008, and extends further north by about 0.5°. In the eastern Atlantic, the western NAC (WNAC) carries the bulk of the transport in the model, while transport estimates based on hydrographic measurements from five repeated sections point to a preference for the eastern NAC (ENAC). The model is able to simulate the main features of the subpolar NA, providing confidence to use the model output to analyze the influence of the North Atlantic Oscillation (NAO). Model based velocity composites reveal an enhanced NAC transport across the MAR of up to 6.7 Sv during positive NAO phases. Most of that signal (5.4 Sv) is added to the ENAC transport, while the transport of the WNAC was independent of the NAO.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 4
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    Circulation and transports in the Newfoundland Basin, western subpolar North Atlantic (2014)
    AGU (American Geophysical Union) | Wiley
    In:  Journal of Geophysical Research: Oceans, 119 (11). pp. 7772-7793.
    Details
    Publication Date: 2019-09-23
    Description: The southwestern part of the subpolar North Atlantic east of the Grand Banks of Newfoundland and Flemish Cap is a crucial area for the Atlantic Meridional Overturning Circulation. Here the exchange between subpolar and subtropical gyre takes place, southward flowing cold and fresh water is replaced by northward flowing warm and salty water within the North Atlantic Current (NAC). As part of a long-term experiment, the circulation east of Flemish Cap has been studied by seven repeat hydrographic sections along 47 degrees N (2003-2011), a 2 year time series of current velocities at the continental slope (2009-2011), 19 years of sea surface height, and 47 years of output from an eddy resolving ocean circulation model. The structure of the flow field in the measurements and the model shows a deep reaching NAC with adjacent recirculation and two distinct cores of southward flow in the Deep Western Boundary Current (DWBC): one core above the continental slope with maximum velocities at mid-depth and the second farther east with bottom-intensified velocities. The western core of the DWBC is rather stable, while the offshore core shows high temporal variability that in the model is correlated with the NAC strength. About 30 Sv of deep water flow southward below a density of sigma=27.68 kg m(-3) in the DWBC. The NAC transports about 110 Sv northward, approximately 15 Sv originating from the DWBC, and 75 Sv recirculating locally east of the NAC, leaving 20 Sv to be supplied by the NAC from the south.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 5
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    Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf (2018)
    Wiley
    In:  EPIC3Geophysical Research Letters, Wiley, 45(16), pp. 8455-8461, ISSN: 00948276
    Details
    Publication Date: 2018-09-27
    Description: A climatically-induced acceleration in ocean-driven melting of Antarctic ice shelves would have consequences for both the discharge of continental ice into the ocean and thus global sea level, and for the formation of Antarctic Bottom Water and the oceanic meridional overturning circulation. Using a novel gas-tight in-situ water sampler, noble gas samples have been collected from six locations beneath the Filchner Ice Shelf, the first such samples from beneath an Antarctic Ice shelf. Helium and neon are uniquely suited as tracers of glacial meltwater in the ocean. Basal meltwater fractions range from 3.6% near the ice shelf base to 0.5% near the sea floor, with distinct regional differences. We estimate an average basal melt rate for the Filchner-Ronne Ice Shelf of 177 ± 95 Gt/year, independently confirming previous results. We calculate that up to 2.7% of the meltwater has been refrozen, and we identify a local source of crustal helium.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 6
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    Current meter and temperature time series (2017/2018) from mooring ET1 south of Azores (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-10
    Description: Data set of current meter and temperature logger mooring deployed at position 30°29.04'N, 30°11.7'W, in 4530m water depth. Record starts on Aug 8, 2017, ends May, 10, 2018. Instruments at 299m (ADCP/SBE56), 609m (Aquadopp/SBE56), 1027m (Aquadopp/SBE56), 1426m (Aquadopp/SBE39+), 2053m (Aquadopp/SBE39+), 2889m (Aquadopp/SBE39+), 3729m (Aquadopp/SBE39+), 4566m (Aquadopp/SBE39+).
    Keywords: currents; Current velocity, east-west; Current velocity, north-south; Current velocity, vertical; DATE/TIME; DEPTH, water; Device type; ENERGY TRANSFER; MOOR; Moor_ET1; Mooring; POS516; POS516_4-1; POS523; POS523_2-1; Poseidon; Pressure, water; See Device type column; South Atlantic Ocean; Temperature; Temperature, water; Time series; TRR181; TRR181 Energy transfers in Atmosphere and Ocean
    Type: Dataset
    Format: text/tab-separated-values, 5535740 data points
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    DATA PANGAEA
  • 7
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    Physical oceanography, CFC-11 and CFC-12 measured on water bottle samples during cruise SUBPOLAR with RV Thalassa (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-10
    Description: Temperature, salinity, oxygen data and anthropogenic tracers measured on the RV Thalassa Cruise Subpolar Brest - St. John's 06/04 - 07/12/2005 Chief Scientist: Monika Rhein Region: Subpolar North Atlantic
    Keywords: anthropogenic tracers; Bottle number; Calculated; Capillary-chromatographic system with electron capture detector; Celtic Sea; CTD, SEA-BIRD SBE 9 plus, SBE 11 plus deck unit; CTD/Rosette; CTD-RO; Date/Time of event; Davis Strait; Density, sigma-theta (0); DEPTH, water; Elevation of event; Event label; Freon-11 (trichorofluoromethane); Freon-12 (dichlorodifluoromethane); Labrador Sea; Latitude of event; Longitude of event; Oxygen; Oxygen, Winkler (Culberson, 1991, WOCE Report 68/91); Oxygen sensor, SBE 43; Pressure, water; Profile; Salinity; South Atlantic Ocean; Station label; SUBPOLAR; SUBPOLAR_001; SUBPOLAR_002; SUBPOLAR_003; SUBPOLAR_004; SUBPOLAR_005; SUBPOLAR_006; SUBPOLAR_007; SUBPOLAR_008; SUBPOLAR_009; SUBPOLAR_010; SUBPOLAR_011; SUBPOLAR_012; SUBPOLAR_013; SUBPOLAR_014; SUBPOLAR_015; SUBPOLAR_016; SUBPOLAR_017; SUBPOLAR_018; SUBPOLAR_019; SUBPOLAR_020; SUBPOLAR_021; SUBPOLAR_022; SUBPOLAR_023; SUBPOLAR_024; SUBPOLAR_025; SUBPOLAR_026; SUBPOLAR_027; SUBPOLAR_028; SUBPOLAR_029; SUBPOLAR_030; SUBPOLAR_031; SUBPOLAR_032; SUBPOLAR_033; SUBPOLAR_034; SUBPOLAR_035; SUBPOLAR_036; SUBPOLAR_037; SUBPOLAR_038; SUBPOLAR_039; SUBPOLAR_040; SUBPOLAR_041; SUBPOLAR_042; SUBPOLAR_043; SUBPOLAR_044; SUBPOLAR_045; SUBPOLAR_046; SUBPOLAR_047; SUBPOLAR_048; SUBPOLAR_049; SUBPOLAR_050; SUBPOLAR_051; SUBPOLAR_052; SUBPOLAR_053; SUBPOLAR_054; SUBPOLAR_055; SUBPOLAR_056; SUBPOLAR_057; SUBPOLAR_058; SUBPOLAR_059; SUBPOLAR_060; SUBPOLAR_061; SUBPOLAR_062; SUBPOLAR_063; SUBPOLAR_064; SUBPOLAR_065; SUBPOLAR_066; SUBPOLAR_067; SUBPOLAR_068; SUBPOLAR_069; SUBPOLAR_070; SUBPOLAR_071; SUBPOLAR_072; SUBPOLAR_073; SUBPOLAR_074; SUBPOLAR_075; SUBPOLAR_076; SUBPOLAR_077; SUBPOLAR_078; SUBPOLAR_079; SUBPOLAR_080; SUBPOLAR_081; SUBPOLAR_082; SUBPOLAR_083; SUBPOLAR_084; SUBPOLAR_085; SUBPOLAR_086; SUBPOLAR_087; SUBPOLAR_088; SUBPOLAR_089; SUBPOLAR_090; SUBPOLAR_091; SUBPOLAR_092; SUBPOLAR_093; SUBPOLAR_094; SUBPOLAR_095; SUBPOLAR_096; SUBPOLAR_097; SUBPOLAR_098; SUBPOLAR_099; SUBPOLAR_100; SUBPOLAR_101; SUBPOLAR_102; SUBPOLAR_103; SUBPOLAR_104; SUBPOLAR_105; SUBPOLAR_106; SUBPOLAR_107; SUBPOLAR_108; SUBPOLAR_109; SUBPOLAR_110; SUBPOLAR_111; SUBPOLAR_112; SUBPOLAR_113; SUBPOLAR_114; SUBPOLAR_115; SUBPOLAR_116; SUBPOLAR_117; SUBPOLAR_118; SUBPOLAR_119; SUBPOLAR_120; SUBPOLAR_121; SUBPOLAR_122; SUBPOLAR_123; SUBPOLAR_124; SUBPOLAR_125; SUBPOLAR_126; SUBPOLAR_127; SUBPOLAR_128; SUBPOLAR_129; subpolar North Atlantic; Temperature, water; Temperature, water, potential; Thalassa; Time in days
    Type: Dataset
    Format: text/tab-separated-values, 27579 data points
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    DATA PANGAEA
  • 8
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    Raw data of SCADCP (self-contained Acoustic Doppler Current Profiler) from three moorings in the Eastern Weddell Sea in 2005
    PANGAEA
    In:  Supplement to: Cisewski, Boris; Strass, Volker H; Rhein, Monika; Krägefsky, Sören (2010): Seasonal variations of diel vertical migration of zooplankton from ADCP backscatter time series data in the Lazarev Sea, Antarctica. Deep Sea Research Part I: Oceanographic Research Papers, 57(1), 78-94, https://doi.org/10.1016/j.dsr.2009.10.005
    Details
    Publication Date: 2023-05-12
    Description: Ten-month time series of mean volume backscattering strength (MVBS) and vertical velocity obtained from three moored acoustic Doppler current profilers (ADCPs) deployed from February until December 2005 at 64°S, 66.5°S and 69°S along the Greenwich Meridian were used to analyse the diel vertical zooplankton migration (DVM) and its seasonality and regional variability in the Lazarev Sea. The estimated MVBS exhibited distinct patterns of DVM at all three mooring sites. Between February and October, the timing of the DVM and the residence time of zooplankton at depth were clearly governed by the day-night rhythm. Mean daily cycles of the ADCP-derived vertical velocity were calculated for successive months and showed maximum ascent and descent velocities of 16 and -15 mm/s. However, a change of the MVBS pattern occurred in late spring/early austral summer (October/November), when the zooplankton communities ceased their synchronous vertical migration at all three mooring sites. Elevated MVBS values were then concentrated in the uppermost layers (〈50 m) at 66.5°S. This period coincided with the decay of sea ice coverage at 64°S and 66.5°S between early November and mid-December. Elevated chlorophyll concentrations, which were measured at the end of the deployment, extended from 67°S to 65°S and indicated a phytoplankton bloom in the upper 50 m. Thus, we propose that the increased food supply associated with an ice edge bloom caused the zooplankton communities to cease their DVM in favour of feeding.
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 9
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    Physical oceanography during three Maria S. Merian cruises (MSM21/2, MSM27, MSM28)
    PANGAEA
    In:  Supplement to: Schneider, Linn; Kieke, Dagmar; Jochumsen, Kerstin; Colbourne, Eugene; Yashayaev, Igor M; Steinfeldt, Reiner; Varotsou, Eirini; Serra, Nuno; Rhein, Monika (2015): Variability of Labrador Sea Water transported through Flemish Pass during 1993-2013. Journal of Geophysical Research: Oceans, 120(8), 5514-5533, https://doi.org/10.1002/2015JC010939
    Details
    Publication Date: 2023-05-12
    Description: Flemish Pass, located at the western subpolar margin, is a passage (sill depth 1200 m) that is constrained by the Grand Banks and the underwater plateau Flemish Cap. In addition to the Deep Western Boundary Current (DWBC) pathway offshore of Flemish Cap, Flemish Pass represents another southward transport pathway for two modes of Labrador Sea Water (LSW), the lightest component of North Atlantic Deep Water carried with the DWBC. This pathway avoids potential stirring regions east of Flemish Cap and deflection into the interior North Atlantic. Ship-based velocity measurements between 2009 and 2013 at 47°N in Flemish Pass and in the DWBC east of Flemish Cap revealed a considerable southward transport of Upper LSW through Flemish Pass (15-27%, -1.0 to -1.5 Sv). About 98% of the denser Deep LSW were carried around Flemish Cap as Flemish Pass is too shallow for considerable transport of Deep LSW. Hydrographic time series from ship-based measurements show a significant warming of 0.3°C/decade and a salinification of 0.03/decade of the Upper LSW in Flemish Pass between 1993 and 2013. Almost identical trends were found for the evolution in the Labrador Sea and in the DWBC east of Flemish Cap. This indicates that the long-term hydrographic variability of Upper LSW in Flemish Pass as well as in the DWBC at 47°N is dominated by changes in the Labrador Sea, which are advected southward. Fifty years of numerical ocean model simulations in Flemish Pass suggest that these trends are part of a multidecadal cycle.
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 10
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    PIES time series in the North Atlantic at the Mid-Atlantic Ridge (2006-2010)
    PANGAEA
    In:  Supplement to: Roessler, Achim; Rhein, Monika; Kieke, Dagmar; Mertens, Christian (2015): Long-term observations of North Atlantic Current transport at the gateway between western and eastern Atlantic. Journal of Geophysical Research: Oceans, 120(6), 4003-4027, https://doi.org/10.1002/2014JC010662
    Details
    Publication Date: 2023-05-12
    Description: In the western North Atlantic, warm and saline water is brought by the North Atlantic Current (NAC) from the subtropics into the subpolar gyre. Four inverted echo sounders with high precision pressure sensors (PIES) were moored between 47°40' N and 52°30' N to study the main pathways of the NAC from the western into the eastern basin. The array configuration that forms three segments (northern, central, and southern) allows partitioning of the NAC and some assessment of NAC flow paths through the different Mid-Atlantic Ridge fracture zones. We exploit the correlation between the NAC transport measured between 2006 and 2010 and the geostrophic velocity from altimeter data to extend the time series of NAC transports to the period from 1992 to 2013. The mean NAC transport over the entire 21 years is 27 ± 5 Sv, consisting of 60% warm water of subtropical origin and 40% subpolar water. We did not find a significant trend in the total transport time series, but individual segments had opposing trends, leading to a more focused NAC in the central subsection and decreasing transports in the southern and northern segments. The spectral analysis exhibits several significant peaks. The two most prominent are around 120 days, identified as the time scale of meanders and eddies, and at 4-9 years, most likely related to the NAO. Transport composites for the years of highest and lowest NAO indices showed a significantly higher transport (+2.9 Sv) during strong NAO years, mainly in the southern segment.
    Type: Dataset
    Format: application/zip, 5 datasets
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    DATA PANGAEA
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