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  • 1
    Online Resource
    Online Resource
    Carbon isotopic variations on glacial‐to‐interglacial time scales in the ocean: Modeling and implications
    American Geophysical Union (AGU) ; 1992
    In:  Paleoceanography Vol. 7, No. 5 ( 1992-10), p. 543-562
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 7, No. 5 ( 1992-10), p. 543-562
    Abstract: Downcore variations in the deep‐sea δ 13 C signal as recorded in benthic foraminifera are a function of past changes in global organic carbon inventory and ocean circulation. Thus the carbon isotopic composition of fossil benthic foraminifera constitutes a valuable geochemical proxy for reconstructing paleooceanographic conditions. This study examines the mean ocean 13 C/ 12 C variations due to the climatically induced changes in the size of the two organic carbon pools: terrestrial biomass (forest‐soil) and continental shelf sediment. Through modeling the paired foraminiferal δ 13 C‐δ 18 O data in the literature, it is estimated that during the past several hundred thousand years in late Quaternary, transfer of organic carbon between these two pools and the ocean in response to glacial‐interglacial climate and sea level changes has resulted in global oceanic δ 13 C fluctuations with a mean amplitude of about 0.32‰. The transfer has accounted for about two thirds of the observed carbon isotopic shift in the deep eastern Pacific (ocean circulation accounting for the remaining one‐third of δ 13 C amplitude variations). In the deep North Atlantic Ocean, it has accounted for about one‐third of the shift. Of the two organic carbon reservoirs, forest‐soil is roughly 2.5 times more responsible than shelf sediment in altering the mean carbon isotopic composition of the Quaternary oceans. Destruction of organic matter from the shelf sediment reservoir is responsible for raising the oceanic nutrient inventory during glacial times by about 4% relative to the present (interglacial) level, a level which is difficult to be assessed by the cadmium proxy. Marine deposition of organic carbon in glacial oceans increased by 3–10%, in spite of a reduction in terrestrial biomass during ice ages. Isolating out the global climatic signals in δ 13 C records shows that since about 300 kyr ago, there has been a trend of increasing organic carbon accumulation toward the present, at least in the equatorial E. Pacific. It also shows that the contrast between the δ 13 C values (hence nutrient content) of deep water in the Atlantic and Pacific observed in today's ocean was smaller during glacial periods. In the northwestern Indian Ocean, the global climate‐corrected δ 13 C results reveal interglacial intensification of the monsoon‐driven upwelling and productivity, back to at least oxygen isotopic stage 11 circa 400 kyr B.P.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/92PA01760
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1992
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  • 2
    Online Resource
    Online Resource
    Constraints on deep-water formation from the oceanic distributions of 10 Be
    American Geophysical Union (AGU) ; 2003
    In:  Journal of Geophysical Research Vol. 108, No. C5 ( 2003)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 108, No. C5 ( 2003)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2002JC001670
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2003
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    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
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    detail.hit.zdb_id: 2969341-X
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    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
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    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Scavenging and fractionation of particle-reactive radioisotopes 7Be, 210Pb and 210Po in the atmosphere
    Elsevier BV ; 2016
    In:  Geochimica et Cosmochimica Acta Vol. 188 ( 2016-09), p. 208-223
    Details
    In: Geochimica et Cosmochimica Acta, Elsevier BV, Vol. 188 ( 2016-09), p. 208-223
    Type of Medium: Online Resource
    ISSN: 0016-7037
    URL: Article
    DOI: 10.1016/j.gca.2016.05.039
    RVK:
    TE 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2016
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  • 4
    Online Resource
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    Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America
    Cambridge University Press (CUP) ; 2004
    In:  Quaternary Research Vol. 61, No. 1 ( 2004-01), p. 95-104
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 61, No. 1 ( 2004-01), p. 95-104
    Abstract: Despite the hypothesized importance of the tropics in the global climate system, few tropical paleoclimatic records extend to periods earlier than the last glacial maximum (LGM), about 20,000 years before present. We present a well-dated 170,000-year time series of hydrologic variation from the southern hemisphere tropics of South America that extends from modern times through most of the penultimate glacial period. Alternating mud and salt units in a core from Salar de Uyuni, Bolivia reflect alternations between wet and dry periods. The most striking feature of the sequence is that the duration of paleolakes increased in the late Quaternary. This change may reflect increased precipitation, geomorphic or tectonic processes that affected basin hydrology, or some combination of both. The dominance of salt between 170,000 and 140,000 yr ago indicates that much of the penultimate glacial period was dry, in contrast to wet conditions in the LGM. Our analyses also suggest that the relative influence of insolation forcing on regional moisture budgets may have been stronger during the past 50,000 years than in earlier times.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1016/j.yqres.2003.08.007
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2004
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  • 5
    Online Resource
    Online Resource
    U-Series Chronology of Lacustrine Deposits in Death Valley, California
    Cambridge University Press (CUP) ; 1998
    In:  Quaternary Research Vol. 50, No. 3 ( 1998-11), p. 261-275
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 50, No. 3 ( 1998-11), p. 261-275
    Abstract: Uranium-series dating on a 186-m core (DV93-1) drilled from Badwater Basin in Death Valley, California, and on calcareous tufas from nearby strandlines shows that Lake Manly, the lake that periodically flooded Death Valley during the late Pleistocene, experienced large fluctuations in depth and chemistry over the last 200,000 yr. Death Valley has been occupied by a long-standing deep lake, perennial shallow saline lakes, and a desiccated salt pan similar to the modern valley floor. The average sedimentation rate of about 1 mm/yr for core DV93-1 was punctuated by episodes of more-rapid accumulation of halite. Arid conditions similar to the modern conditions prevailed during the entire Holocene and between 120,000 and 60,000 yr B.P. From 35,000 yr B.P. to the beginning of the Holocene, a perennial saline lake existed, over 70 m at its deepest. A much deeper and longer lasting perennial Lake Manly existed from about 185,000 to 128,000 yr B.P., with water depths reaching about 175 m, if not 330 m. This lake had two significant “dry” excursions of 10 2 –10 3 yr duration about 166,000 and 146,000 yr B.P., and it began to shrink to the point of halite precipitation between 128,000 and 120,000 yr B.P. The two perennial lake periods correspond to marine oxygen isotopic stages (OIS) 2 and 6. Based on the shoreline tufa ages, we do not rule out the possible existence ∼200,000 yr ago of yet a third perennial lake comparable in size to the OIS 6 lake. The 234 U/ 238 U data suggest that U in tufa owes its origin mainly to Ca-rich springs fed by groundwater that emanated along lake shorelines in southern Death Valley, and that an increase of this spring-water input relative to the river-water input apparently occurred during OIS 6.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1006/qres.1998.1995
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1998
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  • 6
    Online Resource
    Online Resource
    U-Series Dating of Last Interglacial High Sea Stands: Barbados Revisited
    Cambridge University Press (CUP) ; 1990
    In:  Quaternary Research Vol. 33, No. 2 ( 1990-03), p. 129-147
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 33, No. 2 ( 1990-03), p. 129-147
    Abstract: U-series chronologies of the emerged coral limestone terraces on Barbados, West Indies, together with those of the terraces from New Guinea, have formed the basis for most late Pleistocene eustatic models. The so-called “Barbados sea level model” has been challenged in recent years, however. A major issue is whether during oxygen isotope stage 5e, when Rendezvous Hill reef complex on Barbados Island formed, the sea rose above the present position for one relatively brief period of 〈 10,000 yr, or for two or more periods spanning approximately from 140,000 to 115,000 yr B.P. Evidence for the latter scenario has not come from initial studies of Barbados but from elsewhere; it is also inconclusive because of the dating uncertainties involved. We have carried out careful redeterminations of U-series ages on a suite of 29 Acropora palmata samples systematically collected from four of the lowest terraces on the island. Diagenetic disturbance may have caused the age spreads at some sampling outcrops. A model for the diagenetic exchange of uranium isotopes in coral samples with those in groundwater explains the anomalous 234 U/ 238 U ratios in samples with apparently unaltered mineralogy (aragonite) and trace element (Mg and Sr) chemistry. It shows that age dispersions of 5–10% can be engendered by a U exchange coefficient of the order of 10 −6 yr −1 . The lower-limit terrace ages, estimated from averaging the multiple measurements, are 81,000 ± 2000 yr (Worthing), 105,000 ± 1000 yr (Ventnor), 120,000 ± 2000 yr (Maxwell), and 117,000 ± 3000 yr (Rendezvous Hill). No evidence was found of previously inferred bipartite sea levels centering around 118,000 and 135,000 yr ago. This study documents the need of dating coral with the high precision/sensitivity mass-spectrometric techniques for future resolution of the temporal relationships among sea level changes, climate oscillations, and astronomical forcing—relationships originally addressed by the Barbados sea level model.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1016/0033-5894(90)90014-C
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1990
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  • 7
    Online Resource
    Online Resource
    Age dating of lacustrine sediments in Lake Tianshuihai of the Tibetan Plateau by using U-series isochron method and its significance
    Springer Science and Business Media LLC ; 2001
    In:  Chinese Science Bulletin Vol. 46, No. 10 ( 2001-5), p. 862-866
    Details
    In: Chinese Science Bulletin, Springer Science and Business Media LLC, Vol. 46, No. 10 ( 2001-5), p. 862-866
    Type of Medium: Online Resource
    ISSN: 1001-6538 , 1861-9541
    URL: Article
    DOI: 10.1007/BF02900440
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2001
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  • 8
    Online Resource
    Online Resource
    Effect of Surface Fluorination on the Electrochemical Behavior and Surface State of Li 4 Ti 5 O 12 for Lithium Ion Battery
    The Electrochemical Society ; 2014
    In:  ECS Meeting Abstracts Vol. MA2014-03, No. 2 ( 2014-04-01), p. 131-131
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2014-03, No. 2 ( 2014-04-01), p. 131-131
    Abstract: Abstract not Available.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2014-03/2/131
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2014
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  • 9
    Online Resource
    Online Resource
    The 1997–1998 El Niño event recorded by a stalagmite from central China
    Elsevier BV ; 2018
    In:  Quaternary International Vol. 487 ( 2018-09), p. 71-77
    Details
    In: Quaternary International, Elsevier BV, Vol. 487 ( 2018-09), p. 71-77
    Type of Medium: Online Resource
    ISSN: 1040-6182
    URL: Article
    DOI: 10.1016/j.quaint.2017.11.026
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2018
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  • 10
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    Online Resource
    26Al, 10Be and U–Th isotopes in Blake Outer Ridge sediments: implications for past changes in boundary scavenging
    Elsevier BV ; 2001
    In:  Earth and Planetary Science Letters Vol. 185, No. 1-2 ( 2001-02-15), p. 135-147
    Details
    In: Earth and Planetary Science Letters, Elsevier BV, Vol. 185, No. 1-2 ( 2001-02-15), p. 135-147
    Type of Medium: Online Resource
    ISSN: 0012-821X
    URL: Article
    DOI: 10.1016/S0012-821X(00)00372-1
    RVK:
    TE 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2001
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    detail.hit.zdb_id: 1466659-5
    SSG: 16,13
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