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  • OceanRep  (5)
  • AMS (American Meteorological Society)  (3)
  • Edizioni ETS  (1)
  • GEOMAR  (1)
  • Kiel : Inst. für Meereskunde, Abt. Theoretische Ozeanographie
  • 1
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    Regional Patterns of Sea Level Change Related to Interannual Variability and Multidecadal Trends in the Atlantic Meridional Overturning Circulation (2010)
    AMS (American Meteorological Society)
    In:  Journal of Climate, 23 (15). pp. 4243-4254.
    Details
    Publication Date: 2020-08-04
    Description: Some studies of ocean climate model experiments suggest that regional changes in dynamic sea level could provide a valuable indicator of trends in the strength of the Atlantic meridional overturning circulation (MOC). This paper describes the use of a sequence of global ocean–ice model experiments to show that the diagnosed patterns of sea surface height (SSH) anomalies associated with changes in the MOC in the North Atlantic (NA) depend critically on the time scales of interest. Model hindcast simulations for 1958–2004 reproduce the observed pattern of SSH variability with extrema occurring along the Gulf Stream (GS) and in the subpolar gyre (SPG), but they also show that the pattern is primarily related to the wind-driven variability of MOC and gyre circulation on interannual time scales; it is reflected also in the leading EOF of SSH variability over the NA Ocean, as described in previous studies. The pattern, however, is not useful as a “fingerprint” of longer-term changes in the MOC: as shown with a companion experiment, a multidecadal, gradual decline in the MOC [of 5 Sv (1 Sv ≡ 106 m3 s−1) over 5 decades] induces a much broader, basin-scale SSH rise over the mid-to-high-latitude NA, with amplitudes of 20 cm. The detectability of such a trend is low along the GS since low-frequency SSH changes are effectively masked here by strong variability on shorter time scales. More favorable signal-to-noise ratios are found in the SPG and the eastern NA, where a MOC trend of 0.1 Sv yr−1 would leave a significant imprint in SSH already after about 20 years.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
    DOI: 10.1175/2010JCLI3341.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Communicating Science to High School Pupils by Video Production: Lessons Learned (2014)
    Edizioni ETS
    In:  In: Proceedings International Workshop Science education and guidance in schools: the way forward - 21-22 October 2013 Auditorium Sant’Apollonia, Florence, Italy. , ed. by Raschi, A., Di Fabio, A. and Sebastiani, L. Edizioni ETS, Florenz, Italy, pp. 283-289. ISBN 978-88-903469-2-7
    Details
    Publication Date: 2019-09-23
    Description: The Collaborative Research Centre 754 (SFB 754) at GEOMAR in Kiel, Germany is an interdisciplinary research programme, which investigates the threats posed by ocean de-oxygenation and how this is coupled with climate change and the nutrient balance in the tropical oceans. The outreach component of SFB 754 has the task of producing videos with and for school pupils, in which different aspects of the science of the SFB are explained and introduced in a short and entertaining fashion. The goal is to attract pupils to sciences, both by the active involvement in the video production and by the consumption of the videos made by other pupils. So far more than 30 video clips were published on a dedicated website for viewing and download. The process of video production is enjoyable for all parties involved, but it is also time consuming and entails considerably more work for students and teachers, than normal lessons in class. As a result, the project now concentrates on dedicated summer schools and after-school activities as a platform for video production
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 3
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    GEOMAR TV: Folge 3 (2013)
    GEOMAR
    In:  [Video]
    Details
    Publication Date: 2016-03-17
    Description: Sauerstoffminimumzonen stehen im Mittelpunkt der dritten Folge von GEOMAR.tv. Mit Hilfe eines Spurenstoffs ermitteln Wissenschaftler auf einer Expedition von Bord der METEOR, ob Wirbel und Strömungen dem Meer vor den Kapverden neuen Atem einhauchen können. Schüler beschäftigen sich in der Sommerschule am GEOMAR mit Sauerstoffmangel in der Ostsee. Außerdem: Eine Bilanz zum Ende des Langzeit-Experiments zur Ozeanversauerung, Forschungen zur Biodiversität in der Ostsee und als News: Open Ship auf der Kieler Woche sowie ALKOR und POSEIDON auf der Förde.
    Type: Video , NonPeerReviewed
    Format: video
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    OceanRep: Video
  • 4
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    The problem of Gulf Stream separation: a barotropic approach (1993)
    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 23 . pp. 2182-2200.
    Details
    Publication Date: 2020-08-04
    Description: Inertial separation of a western boundary current from an idealized continent is studied in a homogeneous ocean circulation model. A number of processes are identified that either encourage or prevent separation at a coastal promontory in this model. For a single-gyre wind forcing a free-slip boundary condition forces the stream to follow the coastline, whereas the no-slip condition allows separation at a sharp corner. A prescribed countergyre to the north of the stream is not necessary to achieve separation if the no-slip condition is used. "Premature" separation occurs for wind fields that do not extend beyond the latitude of the cape. For a more realistic wind field and coastline two distinct states of the stream are found. At small Reynolds numbers the current fails to separate and develops a stationary anticyclonic meander north of the cape. Stronger currents separate and drive a recirculation in the lee of the continent.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/1520-0485(1993)023〈2182:TPOGSS〉2.0.CO;2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Is the thermohaline circulation changing? (2006)
    AMS (American Meteorological Society)
    In:  Journal of Climate, 19 (18). pp. 4631-4637.
    Details
    Publication Date: 2020-08-04
    Description: Analyses of ocean observations and model simulations suggest that there have been considerable changes in the thermohaline circulation (THC) during the last century. These changes are likely to be the result of natural multidecadal climate variability and are driven by low-frequency variations of the North Atlantic Oscillation (NAO) through changes in Labrador Sea convection. Indications of a sustained THC weakening are not seen during the last few decades. Instead, a strengthening since the 1980s is observed. The combined assessment of ocean hydrography data and model results indicates that the expected anthropogenic weakening of the THC will remain within the range of natural variability during the next several decades
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/JCLI3876.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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