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  • 1
    Online Resource
    Online Resource
    Insolation Cycles as a Major Control of Equatorial Indian Ocean Primary Production
    American Association for the Advancement of Science (AAAS) ; 1997
    In:  Science Vol. 278, No. 5342 ( 1997-11-21), p. 1451-1454
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 278, No. 5342 ( 1997-11-21), p. 1451-1454
    Abstract: Analysis of a continuous sedimentary record taken in the Maldives indicates that strong primary production fluctuations (70 to 390 grams of carbon per square meter per year) have occurred in the equatorial Indian Ocean during the past 910,000 years. The record of primary production is coherent and in phase with the February equatorial insolation, whereas it shows diverse phase behavior with δ 18 O, depending on the orbital frequency (eccentricity, obliquity, or precession) examined. These observations imply a direct control of productivity in the equatorial oceanic system by insolation. In the equatorial Indian Ocean, productivity is driven by the wind intensity of westerlies, which is related to the Southern Oscillation; therefore, it is suggested that a precession forcing on the Southern Oscillation is responsible for the observed paleoproductivity dynamics.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.278.5342.1451
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 1997
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Planktonic Foraminiferal and Alkenone Records of the Last Deglaciation from the Eastern Arabian Sea
    Cambridge University Press (CUP) ; 1999
    In:  Quaternary Research Vol. 52, No. 3 ( 1999-11), p. 337-342
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 52, No. 3 ( 1999-11), p. 337-342
    Abstract: The oxygen isotope record of planktonic foraminifera from tropical core MD77194 (Eastern Arabian Sea) exhibits a clear two-step deglaciation with a brief δ 18 O transient event. In the tropics, this δ 18 O maximum could correspond to a cooling or to a change in the δ 18 O content of sea water. In this study, past sea-surface temperature (SST) and primary production (PP) are reconstructed from foraminiferal transfer functions and compared to values estimated from alkenone measurements. SST and PP records from both proxies indicate a 1.5–2.5°C deglacial warming, coupled with a PP decrease, and a 0.5–1°C cooling during the Younger Dryas (YD). A detailed comparison between independent micropaleontological and geochemical proxies helps us identify potential biases and thus strengthen the paleo-reconstructions.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1006/qres.1999.2083
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1999
    detail.hit.zdb_id: 1471589-2
    detail.hit.zdb_id: 205711-6
    SSG: 13
    SSG: 14
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    Paleoceanographic reconstructions from planktonic foraminifera off the Iberian Margin: Temperature, salinity, and Heinrich events
    American Geophysical Union (AGU) ; 1999
    In:  Paleoceanography Vol. 14, No. 3 ( 1999-06), p. 384-396
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 14, No. 3 ( 1999-06), p. 384-396
    Abstract: A quantitative analysis of planktonic foraminifera in a core from the Iberian Margin allows a reconstruction of the evolution of oceanographic parameters during the last glacial cycle with a resolution of ∼1000 years. A principal component analysis performed on 19 species allows the identification of 11 intervals characterized by increased abundances of the subpolar species. The youngest six of these intervals are correlated with the last 6 Heinrich events (HEs). The five cold events older than stage 4 are dated at 81, 90, 110, 129, and 140 ka, respectively. Paleotemperatures reconstructed using the modern analog technique indicate 4°C decreases during all even‐numbered isotopic stages and stage 3. During the HEs, temperature decreases reach ∼10°C and seawater δ 18 O anomalies reach ∼1‰. Temperature and salinity reconstructions indicate that the environment of the Iberian Margin has been under the combined influence of global factors such as the migration of the polar front and iceberg discharge and of regional factors such as the precipitation/evaporation regime on both oceanic and continental area.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/1998PA900027
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1999
    detail.hit.zdb_id: 637876-6
    detail.hit.zdb_id: 2015231-0
    detail.hit.zdb_id: 2916554-4
    SSG: 16,13
    SSG: 13
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  • 4
    Online Resource
    Online Resource
    Paleoproductivity in the Equatorial Indian Ocean for the last 260,000yr: A transfer function based on planktonic foraminifera
    Elsevier BV ; 1999
    In:  Quaternary Science Reviews Vol. 18, No. 6 ( 1999-5), p. 839-857
    Details
    In: Quaternary Science Reviews, Elsevier BV, Vol. 18, No. 6 ( 1999-5), p. 839-857
    Type of Medium: Online Resource
    ISSN: 0277-3791
    URL: Article
    DOI: 10.1016/S0277-3791(98)00036-5
    RVK:
    RA 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1999
    detail.hit.zdb_id: 780249-3
    detail.hit.zdb_id: 1495523-4
    SSG: 14
    Location Call Number Limitation Availability
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