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  1. AU="Jahn, Britta"
  2. AU="Poilvache, Hervé"
  3. AU="Manavalan, Preeti"
  4. AU="Kruth, Andre"
  5. AU=Kim Seong Eun
  6. AU=Leventoglu Sezai
  7. AU="Yang, Hengquan"
  8. AU="Champion, Patricia A DiGiuseppe"
  9. AU=Tomisa Antoni P
  10. AU="Charleston, Bryan"
  11. AU="Busch, Volker"
  12. AU="Fishwick, James R"
  13. AU="Obrenović-Kirćanski Biljana"
  14. AU="Ch'oe, Ok-hyang"
  15. AU="Chiaverina, Giulia"
  16. AU="Saunders, Gary I"
  17. AU="Ng, Liqi"
  18. AU="Kato, Takeshi"
  19. AU="Dalstra, Michel"
  20. AU="Ruben, Jurjen"
  21. AU="Peersman, Nele"
  22. AU=Yip Christina Y C AU=Yip Christina Y C
  23. AU=Mehan Vivek K.
  24. AU="Nara, Akina"
  25. AU=Saccente Michael
  26. AU="Wang, Xiulu" AU="Wang, Xiulu"
  27. AU="Milnes, Di"
  28. AU=Almudhi Abdulaziz
  29. AU="Kumowski, Nina"
  30. AU="Dedeke, Iyabode"
  31. AU="Srivastava, Mitul"
  32. AU=Que Jian-Yu
  33. AU="Midulla, Martina"
  34. AU="et al"
  35. AU="Pritchard, Jonathan"
  36. AU="Memeo, Lorenzo"
  37. AU="Taylan, Gokay"
  38. AU="Tijssen, Robert J. W."
  39. AU="Silva, Marcelina Jasmine"
  40. AU="Egbuna, Chukwuebuka"

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  1. Buch ; Dissertation / Habilitation: Mid to late pleistocene variations of marine productivity in and terrigenous input to the Southeast Atlantic

    Jahn, Britta

    (Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen ; 199)

    2002  

    Verfasserangabe Jahn, B
    Serientitel Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen ; 199
    Sprache Englisch
    Umfang 97 S, graph. Darst., Kt
    Verlag Fachbereich Geowiss., Univ
    Erscheinungsort Bremen
    Dokumenttyp Buch ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss.--Bremen, 2002
    Datenquelle Ehemaliges Sondersammelgebiet Küsten- und Hochseefischerei

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  2. Buch ; Dissertation / Habilitation: Mid to late pleistocene variations of marine productivity in and terrigenous input to the Southeast Atlantic

    Jahn, Britta

    (Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen ; 199)

    2002  

    Verfasserangabe Jahn, B
    Serientitel Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen ; 199
    Sprache Englisch
    Umfang 97 S, graph. Darst., Kt
    Verlag Fachbereich Geowiss., Univ
    Erscheinungsort Bremen
    Dokumenttyp Buch ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss.--Bremen, 2002
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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  3. Buch ; Online: X-ray fluorescence measurements and bulk organic carbon analyses of ODP Hole 175-1075A, supplementary data to: Jahn, Britta; Schneider, Ralph R; Müller, Peter J; Donner, Barbara; Röhl, Ursula (2005): Response of tropical African and East Atlantic climates to orbital forcing over the last 1.7 Ma. In: Head, M J & Gibbard, P L (eds.) Early-Middle PleistoceneTransitions: The Land-Ocean Evidence. Geological Society, London, Special Publications, 247, 65-84

    Jahn, Britta / Donner, Barbara / Müller, Peter J / Röhl, Ursula / Schneider, Ralph R

    2005  

    Abstract: Records of organic matter accumulation, organic carbon isotopic composition and iron content covering the last 1.7 Ma are presented for the Congo Fan Ocean Drilling Program (ODP) Site 1075, and are compared with their counterparts from ODP Site 663 in ... ...

    Abstract Records of organic matter accumulation, organic carbon isotopic composition and iron content covering the last 1.7 Ma are presented for the Congo Fan Ocean Drilling Program (ODP) Site 1075, and are compared with their counterparts from ODP Site 663 in the equatorial upwelling region. They are discussed with regard to variations in African precipitation and Congo River discharge and in the context of changes in trade-wind-driven marine productivity for the tropical Atlantic at periodicities typical of Milankovitch forcing. On the Congo Fan, elevated total organic carbon mass accumulation rates (TOC MAR) and Fe intensities occur predominantly during interglacial periods when the African monsoon was most intense. Band-pass filtering applied to TOC MAR shows distinct precessional variations, indicating that the African climate was largely controlled by low-latitude insolation changes. Only for the last 0.6 Ma, an interval of enhanced glacial-interglacial climate changes, is the precessional TOC MAR signal superimposed by a strong 100 ka oscillation. In contrast, variations in terrestrial iron input to the Congo Fan indicate pronounced 100 ka variance already well before global glacial-interglacial cycles increased in amplitude between 0.9 and 0.6 Ma. Obliquity cycles in the Fe signal are strongly expressed for the last 0.9 Ma. The highest amplitudes in the precessional variance of fluvial Fe input occur when amplitudes in the 100 ka oscillation were at intermediate levels and reveal a 800 ka cycle in phase shift with respect to precessional forcing. Together with a pronounced 800 ka signal in the 100 ka amplitude variations during the last 1.7 Ma, the Congo Fan iron record therefore suggests that eccentricity modulation of the low-latitude insolation directly influenced the equatorial African monsoon system and probably the weathering conditions on land. It further suggests that low-latitude precessional forcing and monsoonal response in the tropics might have played an important role for 100 ka cycles in global climate well before huge continental ice sheets existed.

    REFERENCE:
    Jahn, Britta (2002): Mid to Late Pleistocene variations of marine productivity in and terrigenous input to the southeast Atlantic. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 199, 97 pp
    Sprache Englisch
    Erscheinungsverlauf 2005-9999
    Umfang Online-Ressource
    Verlag PANGAEA - Data Publisher for Earth & Environmental Science
    Erscheinungsort Bremen/Bremerhaven
    Dokumenttyp Buch ; Online
    Anmerkung This dataset is cited by urn:urn:nbn:de:gbv:46-ep000103218 ; This dataset is supplement to doi:10.1144/GSL.SP.2005.247.01.04
    DOI 10.1594/PANGAEA.779849
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

    Volltext online

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  4. Buch ; Online: Pleistocene sedimentation in the Benguela Current, southeastern Atlantic, supplementary data to: Jahn, Britta; Donner, Barbara; M?ller, Peter J; R?hl, Ursula; Schneider, Ralph R; Wefer, Gerold (2003): Pleistocene variations in dust input and marine productivity in the northern Benguela Current: Evidence of evolution of global glacial-interglacial cycles. Palaeogeography, Palaeoclimatology, Palaeoecology, 193(3-4), 515-533

    Jahn, Britta / Donner, Barbara / M?ller, Peter J / R?hl, Ursula / Schneider, Ralph R / Wefer, Gerold

    2003  

    Abstract: We infer variations in paleoproductivity and eolian input at ODP Site 1082 in the Walvis Basin from stable oxygen isotope compositions of the planktonic foraminifera Globorotalia inflata, total organic carbon mass accumulation rates (TOC MAR), and X-ray ... ...

    Abstract We infer variations in paleoproductivity and eolian input at ODP Site 1082 in the Walvis Basin from stable oxygen isotope compositions of the planktonic foraminifera Globorotalia inflata, total organic carbon mass accumulation rates (TOC MAR), and X-ray fluorescence analyses of Fe content. The most pronounced paleoclimatic changes correspond to the time at about 0.9 Ma, when glacial conditions in the northern hemisphere (NH) led to the onset of pronounced 100-kyr glacial-interglacial cycles. We used Fe intensity as a proxy for eolian terrigenous input, and TOC MAR as a paleoproductivity indicator. Paleoproductivity and eolian input show generally higher-amplitude variations of glacial-interglacial cyclicity from 1.5 to 0.58 Ma, indicating pronounced variations in upwellingfavorable winds in this area. At 0.58 Ma, paleoproductivity and eolian input shifted abruptly to lower-amplitude variations with a periodicity of 100 kyr while delta18O values show a trend toward more negative isotope values for the past 0.65 Myr. Especially during glacial periods, oxygen isotope values indicate increasingly warmer sea-surface temperatures toward the end of the Pleistocene. To evaluate the relative influences of NH glaciation and southern hemisphere (SH) insolation as potential forcing mechanisms for variations of eolian input and productivity in the northern Benguela system, we filtered our proxy records at orbital frequencies. The filtered records of Fe intensity and TOC MAR indicate a strong influence of the 100-kyr and 41-kyr frequency bands, supporting our assumption that strong ice buildup in the NH is the dominant trigger for climate changes on the continent and probably in trade-wind intensity. SH insolation and low-latitude precession-related insolation changes were important for paleoproductivity variations in the northern Benguela system, modifying the nutrient supply by southern ocean intermediate waters and the zonal direction of upwelling-inducing trades by the African monsoon system, respectively.

    REFERENCE:
    Jahn, Britta (2002): Mid to Late Pleistocene variations of marine productivity in and terrigenous input to the southeast Atlantic. Berichte aus dem Fachbereich Geowissenschaften der Universit?t Bremen, 199, 97 pp
    Sprache Englisch
    Erscheinungsverlauf 2003-9999
    Umfang Online-Ressource
    Verlag PANGAEA - Data Publisher for Earth & Environmental Science
    Erscheinungsort Bremen/Bremerhaven
    Dokumenttyp Buch ; Online
    Anmerkung This dataset is cited by urn:urn:nbn:de:gbv:46-ep000103218 ; This dataset is supplement to doi:10.1016/S0031-0182(03)00264-5
    DOI 10.1594/PANGAEA.703973
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

    Volltext online

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  5. Artikel: Mid to Late Pleistocene variations of marine productivity in and terrigenous input to the southeast Atlantic.

    Jahn, Britta

    Abstract: During Ocean Drilling Program (ODP) Leg 175, the Sites 1075, 1077, and 1082 were drilled off the westem coast of Africa (Congo and Namibia). The goal was to reconstruct the Pleistocene history of theAngola-Benguela Current system (ABC-system) between ... ...

    Abstract During Ocean Drilling Program (ODP) Leg 175, the Sites 1075, 1077, and 1082 were drilled off the westem coast of Africa (Congo and Namibia). The goal was to reconstruct the Pleistocene history of theAngola-Benguela Current system (ABC-system) between about 5°S and 22°S. The investigated area is one of the five largest continental margin upwelling systems in the world, with analogues off Peru, California, northwest Africa and in the northeastem Arabian Sea. The ABC-system is characterized by organic-rich sediments that yield an outstanding record of productivity history. One major goal of the present work is to document fluctuations in marine productivity and terrigenous input in relationship to large-scale climate changes within the Pleistocene, including the onset of the mid-Pleistocene Revolution (MPR) associated to Northern Hemisphere glaciation. The MPR covers the transition from the dominant 41 k.y.-cycle of obliquity during the mid-Pleistocene to the dominant 100-k.y. cycle of eccentricity during the late Pleistocene, that has been observed in many marine paleoclimatic records.
    Dokumenttyp Artikel
    Datenquelle AGRIS - International Information System for the Agricultural Sciences and Technology

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