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  • Copernicus Publications (EGU)  (3)
  • Pergamon Press  (3)
  • Kiel : GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel  (2)
  • 1
    Online Resource
    Online Resource
    BMBF-Verbundvorhaben "RACE - Beobachtungen, Simulation und Synthese (multi-)dekadischer Schwankungen der Atlantikzirkulation" : Abschlussbericht der Teilprojekte am GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel : TP 1.1 Die Rolle des tropischen Atlantiks für Klimaschwankungen im atlantischen Raum, TP 1.4 Mechanismen für Zirkulationsschwankungen im Nordatlantik in gekoppelten Ozean-Atmosphäre Modellen, TP 2.2 Die veränderliche Ozeanzirkulation am Westrand des subpolaren Nordatlantiks, TP 3.1 Veränderungen der atlantischen Zirkulationssysteme in hochauflösenden Ozeanmodellen: Ursachen und regionale Auswirkungen (2016)
    Kiel : GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (31 Seiten, 8,99 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb16/875667473.pdf
    URL: https://doi.org/10.2314/GBV:875667473
    DOI: 10.2314/GBV:875667473
    Language: German
    Note: Förderkennzeichen BMBF 03F065B. - Verbund-Nummer 01071018 , "Autor(en): Biastoch, Arne; Böning, Claus; Brandt, Peter; Dengler, Marcus; Fischer, Jürgen; Karstensen, Johannes; Latif, Mojib, Visbeck, Martin" - Berichtsblatt , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Mit deutscher und englischer Zusammenfassung
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  • 2
    Online Resource
    Online Resource
    BMBF-Verbundvorhaben "MIKLIP" : Abschlussbericht des Teilprojekt OCEANOBS am GEOMAR : verification of ensembles and initialization fields for decadal climate predictions via ocean observation systems (2016)
    Kiel : GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
    Details Availability
    Keywords: Forschungsbericht ; Klima ; Modell ; Meeresströmung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (15 Seiten, 1,65 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb17/892789085.pdf
    URL: https://doi.org/10.2314/GBV:892789085
    DOI: 10.2314/GBV:892789085
    Language: German
    Note: Förderkennzeichen BMBF 01LP1114A , Autoren und durchführende Institution dem Berichtsblatt entnommen , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Mit deutscher und englischer Zusammenfassung
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  • 3
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    Mean circulation and EKE distribution in the Labrador Sea Water level of the subpolar North Atlantic (2018)
    Copernicus Publications (EGU)
    In:  Ocean Science, 14 . pp. 1167-1183.
    Details
    Publication Date: 2021-03-19
    Description: A long-term mean flow field for the subpolar North Atlantic region with a horizontal resolution of approximately 25km is created by gridding Argo-derived velocity vectors using two different topography-following interpolation schemes. The 10-day float displacements in the typical drift depths of 1000 to 1500m represent the flow in the Labrador Sea Water density range. Both mapping algorithms separate the flow field into potential vorticity (PV) conserving, i.e., topography-following contribution and a deviating part, which we define as the eddy contribution. To verify the significance of the separation, we compare the mean flow and the eddy kinetic energy (EKE), derived from both mapping algorithms, with those obtained from multiyear mooring observations. The PV-conserving mean flow is characterized by stable boundary currents along all major topographic features including shelf breaks and basin-interior topographic ridges such as the Reykjanes Ridge or the Rockall Plateau. Mid-basin northward advection pathways from the northeastern Labrador Sea into the Irminger Sea and from the Mid-Atlantic Ridge region into the Iceland Basin are well-resolved. An eastward flow is present across the southern boundary of the subpolar gyre near 52°N, the latitude of the Charlie Gibbs Fracture Zone (CGFZ). The mid-depth EKE field resembles most of the satellite-derived surface EKE field. However, noticeable differences exist along the northward advection pathways in the Irminger Sea and the Iceland Basin, where the deep EKE exceeds the surface EKE field. Further, the ratio between mean flow and the square root of the EKE, the Peclet number, reveals distinct advection-dominated regions as well as basin-interior regimes in which mixing is prevailing.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.5194/os-14-1167-2018
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  • 4
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    Summer upwelling at the Boknis Eck time series station (1982 to 2012) - a combined glider and wind data analysis (2014)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 11 . pp. 3603-3617.
    Details
    Publication Date: 2019-05-23
    Description: Two consecutive summer upwelling events, each lasting for less than 24 h, were surveyed in high temporal and vertical resolution close to the Boknis Eck time-series station (BE) in the western Belt Sea (Baltic Sea) in summer 2010 with an autonomous glider. Driven only by moderate offshore winds both events resulted in more than 5 K cooling of surface waters, while only for the second event were significant irreversible changes in the vertical stratification observed. Generalizing the glider survey observations with hourly wind data from nearby meteorological stations, it is found that upwelling in the BE area occurs for wind directions between 190 to 260° and wind speed exceeding 4 m s−1. Based on these thresholds the wind-induced summer (June to September) upwelling conditions in the BE area for the period 1982 to 2012 are reconstructed. On average about 18 days of upwelling favourable wind conditions are found for the four summer months, with significant interannual variability ranging from 7.7 days (2006) to more than 28 days (1985). By aligning upwelling favourable wind conditions with the monthly BE surveys it is found that extreme anomalies in BE surveys follow extended periods of upwelling favourable winds.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.5194/bg-11-3603-2014
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  • 5
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    Winter and summer monsoon water mass, heat and freshwater transport changes in the Arabian Sea near 8°N (2002)
    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 49 . pp. 1173-1195.
    Details
    Publication Date: 2020-08-05
    Description: The differences in the water mass distributions and transports in the Arabian Sea between the summer monsoon of August 1993 and the winter monsoon of January 1998 are investigated, based on two hydrographic sections along approximately 8°N. At the western end the sections were closed by a northward leg towards the African continent at about 55°E. In the central basin along 8°N the monsoon anomalies of the temperature and density below the surface-mixed layer were dominated by annual Rossby waves propagating westward across the Arabian Sea. In the northwestern part of the basin the annual Rossby waves have much smaller impact, and the density anomalies observed there were mostly associated with the Socotra Gyre. Salinity and oxygen differences along the section reflect local processes such as the spreading of water masses originating in the Bay of Bengal, northward transport of Indian Central Water, or slightly stronger southward spreading of Red Sea Water in August than in January. The anomalous wind conditions of 1997/98 influenced only the upper 50–100 m with warmer surface waters in January 1998, and Bay of Bengal Water covered the surface layer of the section in the eastern Arabian Sea. Estimates of the overturning circulation of the Arabian Sea were carried out despite the fact that many uncertainties are involved. For both cruises a vertical overturning cell of about 4–6 Sv was determined, with inflow below 2500 m and outflow between about 300 and 2500 m. In the upper 300–450 m a seasonally reversing shallow meridional overturning cell appears to exist in which the Ekman transport is balanced by a geostrophic transport. The heat flux across 8°N is dominated by the Ekman transport, yielding about –0.6 PW for August 1993, and 0.24 PW for January 1998. These values are comparable to climatological and model derived heat flux estimates. Freshwater fluxes across 8°N also were computed, yielding northward freshwater fluxes of 0.07 Sv in January 1998 and 0.43 Sv in August 1993. From climatological salinities the stronger freshwater flux in August was found to be caused by the seasonal change of salinity storage in the Arabian Sea north of 8°N. The near-surface circulation follows complex pathways, with generally cyclonic-circulation in January 1998 affected at the eastern side by the Laccadive High, and anticyclonic circulation in August 1993.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0645(01)00169-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Annual Rossby waves in the Arabian Sea from TOPEX/POSEIDON altimeter and in-situ data (2002)
    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 49 (7). pp. 1197-1210.
    Details
    Publication Date: 2020-08-05
    Description: Sea-surface height data acquired by the TOPEX/POSEIDON satellite over the Arabian Sea from October 1992 to October 1998 are analyzed. Strong seasonal fluctuations are found between 61 and 101N, which are mainly associated with westward propagating annual Rossby waves radiated from the western side of the Indian subcontinent and that are continuously forced by the action of the wind-stress curl over the central Arabian Sea. An analysis of hydrographic data acquired during August 1993 and during January 1998 at 81N in the Arabian Sea reveals the existence of first- and second-mode annual Rossby waves. These waves, which can be traced as perturbations in the density fields, have wavelengths of 12�103 and 4.4�103km as well as phase velocities of 0.38 and 0.14 m/s, respectively. The waves are associated with a time-dependent meridional overturning cell that sloshes water northward and southward. Between 581 and 681E in the central Arabian Sea, we found a Rossby-wave induced transport in the upper 500m of about 10 Sv southward in August 1993 and northward in January 1998. Below 2000 m, there was still a northward transport of 3.2 Sv in August 1993 and a southward transport of 4.8 Sv in January 1998. A comparison of steric height differences between August 1993 and January 1998 calculated from the observed density fields as well as calculated from the reconstructed density fields using first- and second-mode annual Rossby waves agree quite well with the corresponding sea-surface height differences. Implications resulting from the reflection of annual Rossby waves, like fluctuations of the western boundary currents, are discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0645(01)00166-7
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing (2019)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 16 (13). pp. 2693-2713.
    Details
    Publication Date: 2022-01-31
    Description: River water is the main source of dissolved organic carbon (DOC) in the Arctic Ocean. DOC plays an important role in the Arctic carbon cycle, and its export from land to sea is expected to increase as ongoing climate change accelerates permafrost thaw. However, transport pathways and transformation of DOC in the land-to-ocean transition are mostly unknown. We collected DOC and aCDOM(λ) samples from 11 expeditions to river, coastal and offshore waters and present a new DOC–aCDOM(λ) model for the fluvial–marine transition zone in the Laptev Sea. The aCDOM(λ) characteristics revealed that the dissolved organic matter (DOM) in samples of this dataset are primarily of terrigenous origin. Observed changes in aCDOM(443) and its spectral slopes indicate that DOM is modified by microbial and photo-degradation. Ocean colour remote sensing (OCRS) provides the absorption coefficient of coloured dissolved organic matter (aCDOM(λ)sat) at λ=440 or 443 nm, which can be used to estimate DOC concentration at high temporal and spatial resolution over large regions. We tested the statistical performance of five OCRS algorithms and evaluated the plausibility of the spatial distribution of derived aCDOM(λ)sat. The OLCI (Sentinel-3 Ocean and Land Colour Instrument) neural network swarm (ONNS) algorithm showed the best performance compared to in situ aCDOM(440) (r2=0.72). Additionally, we found ONNS-derived aCDOM(440), in contrast to other algorithms, to be partly independent of sediment concentration, making ONNS the most suitable aCDOM(λ)sat algorithm for the Laptev Sea region. The DOC–aCDOM(λ) model was applied to ONNS-derived aCDOM(440), and retrieved DOC concentration maps showed moderate agreement to in situ data (r2=0.53). The in situ and satellite-retrieved data were offset by up to several days, which may partly explain the weak correlation for this dynamic region. Satellite-derived surface water DOC concentration maps from Medium Resolution Imaging Spectrometer (MERIS) satellite data demonstrate rapid removal of DOC within short time periods in coastal waters of the Laptev Sea, which is likely caused by physical mixing and different types of degradation processes. Using samples from all occurring water types leads to a more robust DOC–aCDOM(λ) model for the retrievals of DOC in Arctic shelf and river waters.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/bg-16-2693-2019
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  • 8
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    Abyssal Circulation in the Somali Basin (2002)
    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 49 (7-8). pp. 1297-1322.
    Details
    Publication Date: 2020-08-05
    Description: The bottom and deep circulation in the Somali Basin are investigated on the basis of hydrographic and direct velocity profiles from three shipboard surveys carried out during the southwest monsoon in 1995 and of velocity time series from the WOCE mooring array ICM7. The inflow of bottom water into the Somali Basin through the Amirante Passage drives a thermohaline circulation, which may be modulated by the monsoon wind forcing. Details of the abyssal circulation have been discussed controversially. Deep velocity records from the mooring array in the northern Somali Basin are dominated by fluctuations with periods of 30–50 days and amplitudes above Full-size image (〈1 K). Despite this strong variability annual record averages indicate the existence of a deep western boundary current (DWBC) below Full-size image (〈1 K) at the base of the continental slope south of Socotra Island as part of a cyclonic bottom circulation. The southwestward DWBC transport off Socotra Island is estimated to Full-size image (〈1 K). The bottom and deep water exchange between the Somali and Arabian Basin north of 7°N is estimated from two cross-basin geostrophic velocity sections referenced by vertically averaged LADCP currents. For the bottom water, an eastward transport into the Arabian Basin of Full-size image (〈1 K) and Full-size image (〈1 K) was determined in June and August, respectively, while for the deep-water layer above Full-size image (〈1 K) eastward transports of Full-size image (〈1 K) in June and Full-size image (〈1 K) in August were obtained.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0645(01)00167-9
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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