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  • 1
    Article
    Article
    Phase relationship and surface water mass change in the Northeast Atlantic during Marine Isotope Stage 11 (MIS 11) (2007)
    Associated volumes
    Details Availability
    In: Quaternary research, Amsterdam [u.a.] : Elsevier, 1970, 68(2007), Seite 445-455, 0033-5894
    In: volume:68
    In: year:2007
    In: pages:445-455
    Type of Medium: Article
    ISSN: 0033-5894
    DOI: doi: 10.1016/j.yqres.2007.07.009
    Language: English
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  • 2
    Online Resource
    Online Resource
    Phase relationship and surface water mass change in the Northeast Atlantic during Marine Isotope Stage 11 (MIS 11) (2007)
    Associated volumes
    Details Availability
    In: Quaternary research, Amsterdam [u.a.] : Elsevier, 1970, 68(2007), Seite 445-455, 0033-5894
    In: volume:68
    In: year:2007
    In: pages:445-455
    Type of Medium: Online Resource
    ISSN: 0033-5894
    DOI: 10.1016/j.yqres.2007.07.009
    Language: English
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    GEOMAR CATALOGUE
    Link to Library Catalog
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  • 3
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    Last interglacial surface water structure in the western Mediterranean (Balearic) Sea: Climatic variability and link between low and high latitudes (2014)
    Elsevier
    In:  Global and Planetary Change, 123 . pp. 67-76.
    Details
    Publication Date: 2019-09-23
    Description: Highlights • Climate progression in the Balearic basin is examined between 140 and 100 ka. • A number of MIS 5e intra-interglacial cooling events is recognized. • MIS 5e climate phasing in the Western Mediterranean resembles the one in the Nordic Seas. • Foraminiferal abundances are strongly tied to a water circulation regime. • The timing of ORL deposition during MIS 5e resembles that of during the Holocene. Abstract A multiproxy analysis based on planktic foraminiferal abundances, derived SSTs, and stable planktic isotopes measurements together with alkenone abundances and Uk′37 SSTs was performed on late MIS 6 to early MIS 5d sediment recovered from Site 975 (ODP Leg 161) in the South Balearic Islands Basin (Western Mediterranean) with emphasis on reconstructing the climate progression of the last interglacial period. A number of abrupt climate changes related to alternative influence of nutrient rich northern and oligotrophic southern water masses was revealed. Heinrich event 11 and cooling events C27, C26, C25, C24, and C23, which have been previously described in the North Atlantic, were recognized. However, in comparison to the eastern North Atlantic mid-latitude region, events C27 and C26 at Site 975 seem to be significantly more pronounced. Together with evidence of a two-phase climate optimum with maximum SSTs reached during its later phase, this implies a close similarity in climate dynamics between the Western Mediterranean and the Nordic seas. We propose that postglacial effects in the Nordic seas had an influence on the western Mediterranean climate via atmospheric circulation and that these effects competed with the insolation force.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.gloplacha.2014.10.004
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Evolution of the central Nordic Seas over the last 20 thousand years (2015)
    Elsevier
    In:  Quaternary Science Reviews, 121 . pp. 98-109.
    Details
    Publication Date: 2017-04-12
    Description: The deep and surface water paleoceanographic evolution of the central Nordic Seas over the last 20 thousand years was reconstructed using various micropaleontological, isotopic and lithological proxy data. These show a high spatial and temporal complexity of the oceanic circulation when compared with other records from the region. During early deglaciation a collapse of ice sheets surrounding the Nordic Seas released large amounts of freshwater that affected both the surface and bottom water circulation and significantly contributed to Heinrich stadial 1. During the Younger Dryas, the central Nordic Seas were affected by a last major freshwater plume which probably originated from the Arctic Ocean. When major ice rafting had ceased around 11ka subsurface temperatures started to rise. However, Atlantic Water advection and subsurface temperatures reached their maximum in the central Nordic Seas later than along the eastern continental margin. That spatio-temporal offset is explained by a gradual re-routing and westward expansion of the Atlantic Water flow during times when the Greenland Sea gyre system became more steadily established. In the Greenland Basin, the Holocene thermal maximum ended c. 5.5ka, and time-coeveal with an increase in sea-ice export from the Arctic. In the Lofoten Basin the cooling occurred later, after 4ka, and together with a weakening of the overturning processes. The Neoglacial cooling was reached c. 3ka, together with low solar irradiance, expanding sea ice and a slight decrease in deep convection. At c. 2ka subsurface temperatures began to rise again due to an increasing influence of Atlantic Waters.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.quascirev.2015.05.013
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  • 5
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    The "MIS 11 paradox" and ocean circulation: Role of millennial scale events (2013)
    Elsevier
    In:  Earth and Planetary Science Letters, 371-372 . pp. 258-268.
    Details
    Publication Date: 2017-03-06
    Description: The role of millennial scale climate variability in supplementing the astronomical forcing of glacial-interglacial transitions remains a major unresolved question. Here we compare the occurrence and character of "terminal" ice rafting events in both the North and South Atlantic during the last deglaciation (Termination I, TI) and during the transition between Marine Isotope Stages (MIS) 12 and 11 (or Termination V. TV). We show that TV experienced a massive terminal ice rafting event in the North Atlantic that was more intense and longer lasting than Heinrich event 1 (H1) of the last deglaciation. This massive ice rafting event was linked to cold stadial conditions and reduced deep water formation in the North Atlantic, in parallel with warming at high southern latitudes, similar to the bipolar seesaw pattern exhibited during H1 over the last deglaciation. We propose that the particular intensity and duration of the TV ice rafting event resulted from the especially large volume of Northern Hemisphere ice sheets during MIS12. In turn, the unusually long duration and large amplitude of TV likely resulted from the exceptionally prolonged collapse of the AMOC during the TV Heinrich stadia], and from a subsequent transient AMOC "overshoot" with respect to later MIS11 interglacial circulation. Furthermore, we suggest that the intense Heinrich stadial of TV contributed to the deglaciation primarily via meridional heat transport anomalies that would have enhanced the incipient warming arising from relatively weak insolation forcing, and only secondarily via CO2 release
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.epsl.2013.03.036
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  • 6
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    The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system (2012)
    Elsevier
    In:  Palaeogeography, Palaeoclimatology, Palaeoecology, 333/334 . pp. 24-39.
    Details
    Publication Date: 2019-09-23
    Description: Temporal and spatial patterns in eastern North Atlantic sea-surface temperatures (SST) were reconstructed for marine isotope stage (MIS) 11c using a submeridional transect of five sediment cores. The SST reconstructions are based on planktic foraminiferal abundances and alkenone indices, and are supported by benthic and planktic stable isotope measurements, as well as by ice-rafted debris content in polar and middle latitudes. Additionally, the larger-scale dynamics of the precipitation regime over northern Africa and the western Mediterranean region was evaluated from iron concentrations in marine sediments off NW Africa and planktic δ13C in combination with analysis of planktic foraminiferal abundances down to the species level in the Mediterranean Sea. Compared to the modern situation, it is revealed that during entire MIS 11c sensu stricto (ss), i.e., between 420 and 398 ka according to our age models, a cold SST anomaly in the Nordic seas co-existed with a warm SST anomaly in the middle latitudes and the subtropics, resulting in steeper meridional SST gradients than during the Holocene. Such a SST pattern correlates well with a prevalence of a negative mode of the modern North Atlantic Oscillation. We suggest that our scenario might partly explain the longer duration of wet conditions in the northern Africa during MIS 11c compared to the Holocene.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.palaeo.2012.03.005
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  • 7
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    A 600-ka Arctic sea-ice record from Mendeleev Ridge based on ostracodes (2013)
    Elsevier
    In:  Quaternary Science Reviews, 79 . pp. 157-167.
    Details
    Publication Date: 2016-09-16
    Description: Arctic paleoceanography and sea-ice history were reconstructed from epipelagic and benthic ostracodes from a sediment core (HLY0503-06JPC, 800 m water depth) located on the Mendeleev Ridge, Western Arctic Ocean. The calcareous microfaunal record (ostracodes and foraminifers) covers several glacial/interglacial cycles back to estimated Marine Isotope Stage 13 (MIS 13, ∼500 ka) with an average sedimentation rate of ∼0.5 cm/ka for most of the stratigraphy (MIS 5–13). Results based on ostracode assemblages and an unusual planktic foraminiferal assemblage in MIS 11 dominated by a temperate-water species Turborotalita egelida show that extreme interglacial warmth, high surface ocean productivity, and possibly open ocean convection characterized MIS 11 and MIS 13 (∼400 and 500 ka, respectively). A major shift in western Arctic Ocean environments toward perennial sea ice occurred after MIS 11 based on the distribution of an ice-dwelling ostracode Acetabulastoma arcticum. Spectral analyses of the ostracode assemblages indicate sea ice and mid-depth ocean circulation in western Arctic Ocean varied primarily at precessional (∼22 ka) and obliquity (∼40 ka) frequencies.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.quascirev.2012.12.010
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  • 8
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    Reconstruction of deep-water conditions in the North Atlantic during MIS 9 based on benthic foraminiferal assemblages (2010)
    Pleiades Publishing, Springer
    In:  Oceanology, 50 (3). pp. 397-407.
    Details
    Publication Date: 2017-02-01
    Description: Marine isotope stage (MIS) 9 is one of the least investigated Pleistocene interglaciations. The present study describes reconstructions of deep-water conditions during this time interval based on benthic foraminiferal assemblages from sediment core M23414 (Rockall Plateau, North Atlantic). The results of faunal analysis were supported by planktic δ18O, sea surface temperature reconstructions based on planktic foraminiferal assemblages and content of ice rafted debris. Statistical data processing using principal component analysis revealed five climate-related benthic foraminiferal associations that changed in response to alterations of deep-water circulation.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1134/S0001437010030094
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  • 9
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    Last interglacial surface water structure in the NW Mediterranean (Balearic) Sea : climatic variability and link between low and high latitudes (2014)
    GeoUnion Alfred-Wegener-Stiftung
    In:  [Poster] In: international REKLIM Conference “Our Climate – Our Future, Regional Perspectives on a Global Challenge” , 06.10.-09.10.2014, Berlin . Our Climate – Our Future : Regional Perspectives on a Global Challenge ; International REKLIM Conference, 6 - 9 October, 2014, Umweltforum Auferstehungskirche, Berlin, Germany ; Program and Abstracts / REKLIM, Helmholtzverbund Regionale Klimaänderungen ; Helmholtz Association ; p. 120 .
    Details
    Publication Date: 2019-09-23
    Description: A multi-proxy analysis based on planktic foraminiferal abundances and derived SSTs, abundances of alkenone compounds and alkenone SSTs as well as stable isotopes measurements was performed for Site 975 (ODP Leg 161) from the slope of the South Balearic-Islands basin (Western Mediterranean) across late MIS 6 to early MIS 5d periods with emphasis on the climate progression of the last inter-glacial period. A number of abrupt climate changes related to alternative influence of northern nutrient rich and southern oligotrophic water masses were revealed. Among climate fluctuations, Heinrich Event 11 and cooling events C 27, C 26, C 25, C 24, C23 which had been detected earlier in the North Atlantic, were recognised. However, in comparison to the eastern North Atlantic mid-latitude region, at Site 975 events C27 and C26 seem to be significantly more pronounced. This fact along with evidence of two-phase climate optimum with the SSTs maximum reached during its later phase implies close similarity in climate dynamics between the Western Mediterranean and the Nordic Seas. It is proposed that postglacial effects in the Nordic Seas had an influence on the western Mediterranean climate via atmospheric circulation and competed with the insolation effect.
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 10
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    Sea surface conditions in the Okhotsk Sea during the two last interglacials: evidence from planktonic foraminiferal, isotopic and Mg/Ca-derived records (2015)
    In:  [Poster] In: 21. International School on Marine Geology, 16.-20.11.2015, Moscow, Russia .
    Details
    Publication Date: 2016-03-02
    Type: Conference or Workshop Item , NonPeerReviewed
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