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  • PANGAEA  (1,482)
  • AGU (American Geophysical Union)  (2)
  • Bremen : Fachbereich Geowissenschaften, Universität Bremen  (2)
Document type
Keywords
Publisher
Language
Years
  • 1
    Book
    Book
    Kurzbericht über die Meteor - Expedition Nr. 6 : Hamburg - Hamburg, 28. Oktober 1987-19. Mai 1988 (1988)
    Bremen : Fachbereich Geowissenschaften, Universität Bremen
    Details Availability
    Type of Medium: Book
    Pages: 29 Seiten , Karten, Diagramme , 30 cm
    Series Statement: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen Nr. 4
    Language: German
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  • 2
    Book
    Book
    Partikelfluß und Kohlenstoffkreislauf im Ozean : Bericht und Kurzfassungen über den Workshop vom 3.-4. Juli 1989 in Bremen (1989)
    Bremen : Fachbereich Geowissenschaften, Universität Bremen
    Details Availability
    Keywords: Konferenzschrift
    Type of Medium: Book
    Pages: 57 Seiten , Karten, Diagramme, Illustrationen , 30 cm
    Series Statement: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen Nr. 6
    URL: http://www.gbv.de/dms/tib-ub-hannover/019611307.pdf
    Language: German
    Note: Literaturangaben
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  • 3
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    Abrupt changes of temperature and water chemistry in the late Pleistocene and early Holocene Black Sea (2008)
    AGU (American Geophysical Union)
    In:  Geochemistry, Geophysics, Geosystems, 9 (Q01004).
    Details
    Publication Date: 2018-03-08
    Description: New Mg/Ca, Sr/Ca, and published stable oxygen isotope and 87Sr/86Sr data obtained on ostracods from gravity cores located on the northwestern Black Sea slope were used to infer changes in the Black Sea hydrology and water chemistry for the period between 30 to 8 ka B.P. (calibrated radiocarbon years). The period prior to 16.5 ka B.P. was characterized by stable conditions in all records until a distinct drop in δ18O values combined with a sharp increase in 87Sr/86Sr occurred between 16.5 and 14.8 ka B.P. This event is attributed to an increased runoff from the northern drainage area of the Black Sea between Heinrich Event 1 and the onset of the Bølling warm period. While the Mg/Ca and Sr/Ca records remained rather unaffected by this inflow; they show an abrupt rise with the onset of the Bølling/Allerød warm period. This rise was caused by calcite precipitation in the surface water, which led to a sudden increase of the Sr/Ca and Mg/Ca ratios of the Black Sea water. The stable oxygen isotopes also start to increase around 15 ka B.P., although in a more gradual manner, due to isotopically enriched meteoric precipitation. While Sr/Ca remains constant during the following interval of the Younger Dryas cold period, a decrease in the Mg/Ca ratio implies that the intermediate water masses of the Black Sea temporarily cooled by 1–2°C during the Younger Dryas. The 87Sr/86Sr values drop after the cessation of the water inflow at 15 ka B.P. to a lower level until the Younger Dryas, where they reach values similar to those observed during the Last Glacial Maximum. This might point to a potential outflow to the Mediterranean Sea via the Sea of Marmara during this period. The inflow of Mediterranean water started around 9.3 ka B.P., which is clearly detectable in the abruptly increasing Mg/Ca, Sr/Ca, and 87Sr/86Sr values. The accompanying increase in the δ18O record is less pronounced and would fit to an inflow lasting ∼100 a.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2007GC001683
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Overview of Glacial Atlantic Ocean Mapping (GLAMAP 2000) (2003)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 18 (2). p. 1030.
    Details
    Publication Date: 2017-05-10
    Description: GLAMAP 2000 presents new reconstructions of the Atlantic's sea surface temperatures (SST) at the Last Glacial Maximum (LGM), defined at both 21,500–18,000 years B.P. (“Last Isotope Maximum”) and 23,000–19,000 years B.P. (maximum glacial sea level low stand and orbital minimum of solar insolation; EPILOG working group; see Mix et al. [2001]). These reconstructions use 275 sediment cores between the North Pole and 60°S with carefully defined chronostratigraphies. Four categories of core quality are distinguished. More than 100 core sections provide a glacial record with subcentennial- to multicentennial-scale resolution. SST estimates are based on a new set of almost 1000 reference samples of modern planktic foraminifera and on improved transfer-function techniques to deduce SST from census counts of microfossils, including radiolarians and diatoms. New proxies also serve to deduce sea ice boundaries. The GLAMAP 2000 SST patterns differ significantly in crucial regions from the CLIMAP [1981] reconstruction and thus are important in providing updated boundary conditions to initiate and validate computational models for climate prediction.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2002PA000769
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Bericht über die Gewinnung von Korallen-Bohrkernen für Isotopen-Untersuchungen zur klimatischen Entwicklung der letzten Jahrhunderte (1984)
    PANGAEA
    In:  EPIC3Bremerhaven, PANGAEA
    Details
    Publication Date: 2018-04-03
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
    Format: application/pdf
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  • 6
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    Sedimentverteilung bei Bokniseck (1974)
    PANGAEA
    In:  EPIC3Meyniana, Bremerhaven, PANGAEA, 26, pp. 3-7
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
    Format: application/pdf
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  • 7
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    Anwendungen der Forschungstauchens in der Geologie: Beispiele aus der Kieler Tauchgruppe (1978)
    PANGAEA
    In:  EPIC3Bremerhaven, PANGAEA
    Details
    Publication Date: 2014-05-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
    Format: application/pdf
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  • 8
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    Hydrogen isotopic composition of sediment cores from a transect off western Africa (2013)
    PANGAEA
    In:  Supplement to: Collins, James A; Schefuß, Enno; Mulitza, Stefan; Prange, Matthias; Werner, Martin; Tharammal, Thejna; Paul, André; Wefer, Gerold (2013): Estimating the hydrogen isotopic composition of past precipitation using leaf-waxes from western Africa. Quaternary Science Reviews, 65, 88-101, https://doi.org/10.1016/j.quascirev.2013.01.007
    Details
    Publication Date: 2023-03-03
    Description: The hydrogen isotopic composition of plant leaf-wax n-alkanes (dDwax) is a novel proxy for estimating dD of past precipitation (dDp). However, vegetation life-form and relative humidity exert secondary effects on dDwax, preventing quantitative estimates of past dDp. Here, we present an approach for removing the effect of vegetation-type and relative humidity from dDwax and thus for directly estimating past dDp. We test this approach on modern day (late Holocene; 0-3 ka) sediments from a transect of 9 marine cores spanning 21°N-23°S off the western coast of Africa. We estimate vegetation type (C3 tree versus C4 grass) using d13C of leaf-wax n-alkanes and correct dDwax for vegetation-type with previously-derived apparent fractionation factors for each vegetation type. Late Holocene vegetation-corrected dDwax (dDvc) displays a good fit with modern-day dDp, suggesting that the effects of vegetation type and relative humidity have both been removed and thus that dDvc is a good estimate of dDp. We find that the magnitude of the effect of C3 tree - C4 grass changes on dDwax is small compared to dDp changes. We go on to estimate dDvc for the mid-Holocene (6-8 ka), the Last Glacial Maximum (LGM; 19-23 ka) and Heinrich Stadial 1 (HS1; 16-18.5 ka). In terms of past hydrological changes, our leaf-wax based estimates of dDp mostly reflect changes in wet season intensity, which is complementary to estimates of wet season length based on leaf-wax d13C.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 9
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    Fe/K-ratios and pollen analysis of ODP Site 202-1239 (2017)
    PANGAEA
    In:  Supplement to: Grimmer, Friederike; Dupont, Lydie M; Lamy, Frank; Jung, Gerlinde; González, Catalina; Wefer, Gerold (2018): Early Pliocene vegetation and hydrology changes in western equatorial South America. Climate of the Past, 14(11), 1739-1754, https://doi.org/10.5194/cp-14-1739-2018
    Details
    Publication Date: 2023-03-03
    Description: Vegetation and climate change in nortwestern South America were studied using pollen analysis in combination with XRF scanning on marine sediments of ODP Site 1239 from the East Equatorial Pacific comprising the interval between 4.7 and 4.2 Ma. The study site is sensitive to latitudinal shifts of the Intertropical Convergence Zone (ITCZ) shifts insofar as a southward (northward) shift would result in increased (decreased) precipitation over Ecuador. The presented pollen record (46 samples) comprises representatives from five ecological groups: lowland rainforest, lower montane forest, upper montane forest, páramo, and broad range taxa. A broad tropical rainforest coverage persisted in the study area throughout the early Pliocene, without significant open vegetation below the forest line. Between 4.7 and 4.42 Ma, humidity increases, reaching its peak around 4.42 Ma, and slightly decreasing again afterwards. The stable, permanently humid conditions are rather in agreement with paleoceanographic data indicating a southward shift of the ITCZ, possibly in response to closure of the Central American Seaway. The presence of páramo vegetation indicates that the Western Cordillera of the northern Andes had already reached considerable elevation by the early Pliocene. The trend in iron/potassium-ratios (Fe/K) is similar to the pattern of humidity inferred from the pollen spectrum, showing the highest values around 4.46 Ma, thus supporting the hydrological interpretation of the pollen record.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 10
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    XRF core scanning, magnetic susceptibility and density data from the central Japan Trench (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-03
    Description: The data set compiles gamma-ray wet bulk density, magnetic susceptibility (MS), and XRF core scans of the three cores GeoB16433-1 (38° 07.843'N, 144° 00.135'E, 7,525 m water depth), GeoB16431-1 (38° 00.177'N, 143° 59.981'E, 7,542 m water depth), and GeoB16444-1 (37° 42.017'N, 143° 52.377'E, 7,529 m water depth) retrieved from the central Japan Trench during Sonne Cruise SO219A in 2012. Gamma-ray wet bulk density and MS were measured by using the Geotek multi-sensor core logger at MARUM, University of Bremen. XRF core scans (elements: Al, Si, S, K, Ca, Ti, Mn, Fe, Br, Rb, Sr, Zr) were analyzed by using the Avaatech XRF core scanner at MARUM, University of Bremen.
    Keywords: Center for Marine Environmental Sciences; density; magnetic susceptibility; MARUM; XRF CS
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
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