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  • Center for Marine Environmental Sciences; MARUM  (7)
  • Einführung  (5)
Document type
Keywords
Publisher
Language
Years
  • 1
    Book
    Book
    Expedition Erde : Wissenswertes und Spannendes aus den Geowissenschaften (2006)
    Bremen : GeoUnion - Alfred-Wegener-Stiftung
    Details Availability
    Keywords: geosciences ; Einführung ; Aufsatzsammlung ; Geowissenschaften ; Aufsatzsammlung ; Geowissenschaften
    Type of Medium: Book
    Pages: 335 S. , zahlr. Ill., graph. Darst., Kt.
    Edition: 2., überarb. und erw. Aufl.
    URL: http://www.gbv.de/dms/hebis-darmstadt/toc/19013934X.pdf
    RVK:
    RB 10065
    RVK:
    TG 1000
    RVK:
    RB 10050
    Language: German
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  • 2
    Book
    Book
    Expedition Erde : Beiträge zum Jahr der Geowissenschaften 2002 (2002)
    Berlin : Alfred-Wegener-Stiftung zur Förderung der Geowissenschaften [u.a.]
    Details Availability
    Keywords: geosciences ; Einführung ; Aufsatzsammlung ; Geowissenschaften
    Type of Medium: Book
    Pages: 249 S. , zahlr. Ill., graph. Darst.
    URL: http://www.gbv.de/dms/hebis-darmstadt/toc/112714269.pdf
    RVK:
    TG 1000
    Language: German
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  • 3
    Book
    Book
    Expedition Erde : Wissenswertes und Spannendes aus den Geowissenschaften (2015)
    Bremen : MARUM - Zentrum für Marine Umweltwissenschaften
    Details Availability
    Keywords: geosciences ; Einführung ; Aufsatzsammlung ; Einführung ; Geowissenschaften ; Aufsatzsammlung ; Geowissenschaften
    Description / Table of Contents: In Expedition Erde berichten Fachleute in allgemein verständlicher Form über Wissenwertes und Spannendes aus dem breiten Spektrum der Geowissenschaften: Wie ist unser Sonnensystem entstanden? Wie hängt die Bewegung der Kontinente mit Erdbeben und Vulkanausbrüchen zusammen? Wie sah unsere Erde vor etwa 200 Millionen Jahre aus? Was können wir aus Meeresablagerungen über unser Klima lernen? Müssen wir Wasser sparen? Wie lange reichen unsere Bodenschätze? Wie haben sich die unterschiedlichen Lebewesen entwickelt? Wie können wir schonend mit unserem Küstenraum umgehen? Wie sind geowissenschaftliche Themen in Bildern, Kunstwerken und in der Literatur dokumentiert? Spannende Geowissenschaften auf 500 Seiten. Das bietet dieses Buch. Für Schüler, Schülerinnen und Lehrer, für Kenner und neugierige Laien, für alle Interessierten.
    Type of Medium: Book
    Pages: 496 S. , zahlr. Ill., graph. Darst., Kt. , 31 x 22 cm
    Edition: 4., überarb. und erw. Aufl.
    ISBN: 9783000490453
    Series Statement: Marum Bibliothek
    URL: http://d-nb.info/1074386132/04
    DDC: 551.40222
    RVK:
    RB 10065
    RVK:
    TG 1000
    RVK:
    RB 10000
    Language: German
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  • 4
    Book
    Book
    Expedition Erde : Wissenswertes und Spannendes aus den Geowissenschaften (2010)
    Bremen : MARUM - Zentrum für Marine Umweltwissenschaften
    Details Availability
    Keywords: geosciences ; Einführung ; Aufsatzsammlung ; Einführung ; Geowissenschaften ; Aufsatzsammlung ; Geowissenschaften ; Geowissenschaften
    Type of Medium: Book
    Pages: 461 Seiten , Illustrationen, Diagramme, Karten , 31 cm
    Edition: 3., überarbeitete und erweiterte Auflage
    ISBN: 9783000307720
    Series Statement: Marum Bibliothek
    URL: https://swbplus.bsz-bw.de/bsz335336973inh.htm
    DDC: 551.40222
    RVK:
    RB 10065
    RVK:
    TG 1000
    Language: German
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  • 5
    Image
    Image
    TIEFSEE : Expeditionen zu den Quellen des Lebens ; Begleitbuch zur Sonderausstellung im Austellungszentrum Lokschuppen Rosenheim, 23. März bis 4. November 2012 (2012)
    Rosenheim : Veranstaltungs + Kongress GmbH | Bremen : MARUM
    Details Availability
    Keywords: Bildband ; Ausstellungskatalog ; Aufsatzsammlung ; Einführung ; Meereskunde
    Type of Medium: Image
    Pages: 249 S. , zahlr. Ill. , 30 cm
    ISBN: 3000373713 , 9783000373718
    Series Statement: marum Bibliothek
    URL: https://swbplus.bsz-bw.de/bsz370916778inh.htm
    Language: German
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  • 6
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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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  • 7
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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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  • 8
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    Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect (2013)
    PANGAEA
    In:  Supplement to: Collins, James A; Govin, Aline; Mulitza, Stefan; Heslop, David; Zabel, Matthias; Hartmann, Jens; Röhl, Ursula; Wefer, Gerold (2013): Abrupt shifts of the Sahara–Sahel boundary during Heinrich stadials. Climate of the Past, 9(3), 1181-1191, https://doi.org/10.5194/cp-9-1181-2013
    Details
    Publication Date: 2023-06-15
    Description: Relict dune fields that are found as far south as 14° N in the modern-day African Sahel are testament to equatorward expansions of the Sahara desert during the Late Pleistocene. However, the discontinuous nature of dune records means that abrupt millennial-timescale climate events are not always resolved. High-resolution marine core studies have identified Heinrich stadials as the dustiest periods of the last glacial in West Africa although the spatial evolution of dust export on millennial timescales has so far not been investigated. We use the major-element composition of four high-resolution marine sediment cores to reconstruct the spatial extent of Saharan-dust versus river-sediment input to the continental margin from West Africa over the last 60 ka. This allows us to map the position of the sediment composition corresponding to the Sahara-Sahel boundary. Our records indicate that the Sahara-Sahel boundary reached its most southerly position (13° N) during Heinrich stadials and hence suggest that these were the periods when the sand dunes formed at 14° N on the continent. Heinrich stadials are associated with cold North Atlantic sea surface temperatures which appear to have triggered abrupt increases of aridity and wind strength in the Sahel. Our study illustrates the influence of the Atlantic meridional overturning circulation on the position of the Sahara-Sahel boundary and on global atmospheric dust loading.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 8 datasets
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  • 9
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    Reconstruction of the provenance and distribution of terrigenous sediments off NE South America over the last 30ka (2015)
    PANGAEA
    In:  Supplement to: Zhang, Yancheng; Chiessi, Cristiano Mazur; Mulitza, Stefan; Zabel, Matthias; Trindade, Ricardo F; Hollanda, Maria Helena B M; Dantas, Elton L; Govin, Aline; Tiedemann, Ralf; Wefer, Gerold (2015): Origin of increased terrigenous supply to the NE South American continental margin during Heinrich Stadial 1 and the Younger Dryas. Earth and Planetary Science Letters, 432, 493-500, https://doi.org/10.1016/j.epsl.2015.09.054
    Details
    Publication Date: 2023-06-15
    Description: We investigate the redistribution of terrigenous materials in the northeastern (NE) South American continental margin during slowdown events of the Atlantic Meridional Overturning Circulation (AMOC). The compilation of stratigraphic data from 108 marine sediment cores collected across the western tropical Atlantic shows an extreme rise in sedimentation rates off the Parnaíba River mouth (about 2°S) during Heinrich Stadial 1 (HS1, 18-15 ka). Sediment core GeoB16206-1, raised offshore the Parnaíba River mouth, documents relatively constant 143Nd/144Nd values (expressed as epsilonNd(0)) throughout the last 30 ka. Whereas the homogeneous epsilonNd(0) data support the input of fluvial sediments by the Parnaíba River from the same source area directly onshore, the increases in Fe/Ca, Al/Si and Rb/Sr during HS1 indicate a marked intensification of fluvial erosion in the Parnaíba River drainage basin. In contrast, the epsilonNd(0) values from sediment core GeoB16224-1 collected off French Guiana (about 7°N) suggest Amazon-sourced materials within the last 30 ka. We attribute the extremely high volume of terrigenous sediments deposited offshore the Parnaíba River mouth during HS1 to (i) an enhanced precipitation in the catchment region and (ii) a reduced North Brazil Current, which are both associated with a weakened AMOC.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 8 datasets
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  • 10
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    Particle fluxes and in-situ particle properties measured with sediment traps and a moored camera system from 2008 - 2010 in region off Cape Blanc / NW-Africa (2015)
    PANGAEA
    In:  Supplement to: Nowald, Nicolas; Iversen, Morten Hvitfeldt; Fischer, Gerhard; Ratmeyer, Volker; Wefer, Gerold (2015): Time series of in-situ particle properties and sediment trap fluxes in the coastal upwelling filament off Cape Blanc, Mauritania. Progress in Oceanography, 137, 1-11, https://doi.org/10.1016/j.pocean.2014.12.015
    Details
    Publication Date: 2023-10-27
    Description: We compared particle data from a moored video camera system with sediment trap derived fluxes at ~1100 m depth in the highly dynamic coastal upwelling system off Cape Blanc, Mauritania. Between spring 2008 and winter 2010 the trap collected settling particles in 9-day intervals, while the camera recorded in-situ particle abundance and size-distribution every third day. Particle fluxes were highly variable (40-1200 mg m**-2 d**-1) and followed distinct seasonal patterns with peaks during spring, summer and fall. The particle flux patterns from the sediment traps correlated to the total particle volume captured by the video camera, which ranged from1 to 22 mm**3 l**-1. The measured increase in total particle volume during periods of high mass flux appeared to be better related to increases in the particle concentrations, rather than to increased average particle size. We observed events that had similar particle fluxes, but showed clear differences in particle abundance and size-distribution, and vice versa. Such observations can only be explained by shifts in the composition of the settling material, with changes both in particle density and chemical composition. For example, the input of wind-blown dust from the Sahara during September 2009 led to the formation of high numbers of comparably small particles in the water column. This suggests that, besides seasonal changes, the composition of marine particles in one region underlies episodical changes. The time between the appearance of high dust concentrations in the atmosphere and the increase lithogenic flux in the 1100 m deep trap suggested an average settling rate of 200 m d**-1, indicating a close and fast coupling between dust input and sedimentation of the material.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 6 datasets
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