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  • 1995-1999  (27)
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  • 1
    Publication Date: 2020-01-21
    Type: Dataset
    Format: text/tab-separated-values, 141 data points
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  • 2
    Publication Date: 2020-01-21
    Type: Dataset
    Format: text/tab-separated-values, 85 data points
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  • 3
    Publication Date: 2020-01-19
    Type: Dataset
    Format: text/tab-separated-values, 37 data points
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  • 4
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    PANGAEA
    In:  Supplement to: Raymo, Maureen E; Oppo, Delia W; Curry, William B (1997): The mid-Pleistocene climate transition: A deep sea carbon isotopic perspective. Paleoceanography, 12(4), 546-559, https://doi.org/10.1029/97PA01019
    Publication Date: 2020-01-18
    Description: Five delta13C records from the deep ocean, extending back to 1.3 Ma, were examined in order to constrain changes in mean ocean carbon isotope composition and thermohaline circulation over the 41- to 100-ka climate transition. These data show that significant perturbations in mean ocean carbon chemistry were associated with the mid-Pleistocene climate transition. Notable features of the last 1.3 Myr are (1) a pronounced ~0.3‰ decrease in mean ocean delta13C between 0.9 and 1.0 Myr, followed by a return to pre-1.0 Ma values by 400 ka B.P., which we propose was due to the onetime addition of isotopically depleted terrestrial carbon to the ocean, possibly associated with an increase in global aridity (and decrease in the size of the biosphere) across the 41- to 100-ka transition; (2) no change in the Atlantic-Pacific (A-P) delta13C gradient over the last 1.3 Myr, suggesting no change in mean ocean nutrient content accompanied the addition of light carbon; and (3) stronger vertical nutrient fractionation in the North Atlantic in the middle Pleistocene between sites 607 and 552, suggesting weaker North Atlantic Deep Water formation at this time relative to the early and late Pleistocene. We also find evidence for a more pronounced deep recirculation gyre in the western North Atlantic basin in the early Brunhes, as evidenced by “aging” of deep northern basin water (site 607) relative to deep water in the equatorial Atlantic (site 664).
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 5
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    PANGAEA
    In:  Supplement to: Oppo, Delia W; Raymo, Maureen E; Lohmann, Gerrit; Mix, Alan C; Wright, James D; Prell, Warren L (1995): A d13C record of Upper North Atlantic Deep Water during the past 2.6 million years. Paleoceanography, 10(3), 373-394, https://doi.org/10.1029/95PA00332
    Publication Date: 2020-01-18
    Description: Benthic foraminiferal delta13C data from site 502 in the Caribbean Sea (sill depth ?1800 m) indicate that throughout the past 2.6 m.y., glacial delta13C values in the middepth Atlantic were higher during glaciations than interglaciations. This is interpreted as indicating a greater proportion of Upper North Atlantic Deep Water (UNADW) relative to southern source waters during glaciations. The contribution of UNADW during interglaciations to the middepth Atlantic remained approximately constant, and the contribution during glaciations may have been as much as 10 % higher in the late Pleistocene than in the late Pliocene. This small increase is in striking contrast to the much larger decrease in glacial Lower North Atlantic Deep Water (LNADW) contribution relative to southern sources, from about 80% to about 20%, that occurred over the past 2.6 m.y. Glacial intensification over the past 2.6 m.y. was probably coupled with a decrease in northward heat transport by the upper limb of the North Atlantic circulation cell, as was previously suggested on the basis of a LNADW record alone. Late Pleistocene (1 Ma-present) delta13C values in the Caribbean Sea were approximately 0.2 per mil higher than they were from 2.6 to 2.0 Ma. The delta13C rise is not due to an increase in the mean ocean delta13C value, nor can it be entirely attributed to an increase in the proportion of high-delta13C source waters. An increase in the delta13C value of the surface source waters must have contributed to the delta13C rise.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 6
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    PANGAEA
    In:  Supplement to: Curry, William B; Oppo, Delia W (1997): Synchronous, high-frequency oscillations in tropical sea surface temperatures and North Atlantic Deep Water productivity during the last glacial cycle. Paleoceanography, 12(1), 1-14, https://doi.org/10.1029/96PA02413
    Publication Date: 2020-01-18
    Description: Stable isotopic measurements of G. sacculifer and C. wuellerstorfi in a core from the western equatorial Atlantic imply that there are parallel, suborbital oscillations in surface water hydrography and deep water circulation occurring during oxygen isotope stages 2 and 3. Low values of G. sacculifer delta18O accompany high values of C. wuellerstorfi delta13C, linking warmer sea surface temperatures (SSTs) in the tropics with increased production of lower North Atlantic Deep Water (NADW). The amplitude of the delta18O oscillations is 0.6 per mil (or 2°-3°C), which is superimposed on a glacial/interglacial amplitude of about 2.1per mil. Using the G. sacculifer delta18O data, we calculate that surface waters were colder during stage 2 than calculated by CLIMAP [1976, 1981]. The longer-period (〉2 kyr) oscillations in air temperature recorded in the Greenland and Antarctic ice cores appear to correlate with oscillations in sea surface temperature in the equatorial Atlantic. The magnitude of these oscillations in tropical SST is too large to have resulted from changes in meridional heat transport caused by the global conveyor alone. The apparent synchroneity of equatorial SST and polar air temperature changes, as well as the amplitude of the SST changes at the equator, are consistent with the climate effects expected from changes in the atmosphere's greenhouse gas content (H2Ovapor, CO2, and CH4).
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillan Magazines Ltd.
    Nature 393 (1998), S. 557-561 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ocean circulation is closely linked to climate change on glacial–interglacial and shorter timescales. Extensive reorganizations in the circulation of deep and intermediate-depth waters in the Atlantic Ocean have been hypothesized for both the last glaciation and the subsequent Younger ...
    Type of Medium: Electronic Resource
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  • 8
    Publication Date: 2020-02-11
    Type: Dataset
    Format: text/tab-separated-values, 460 data points
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  • 9
    Publication Date: 2020-02-11
    Type: Dataset
    Format: text/tab-separated-values, 760 data points
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  • 10
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    PANGAEA
    In:  Supplement to: Oppo, Delia W; McManus, Jerry F; Cullen, James L (1998): Abrupt climate cvents 500,000 to 340,000 years ago: evidence from subpolar North Atlantic sediments. Science, 279(5355), 1335-1338, https://doi.org/10.1126/science.279.5355.1335
    Publication Date: 2020-02-11
    Description: Subpolar North Atlantic proxy records document millennial-scale climate variations 500,000 to 340,000 years ago. The cycles have an approximately constant pacing that is similar to that documented for the last glacial cycle. These findings suggest that such climate variations are inherent to the late Pleistocene, regardless of glacial state. Sea surface temperature during the warm peak of Marine Isotope Stage 11 (MIS 11) varied by 0.5° to 1°C, less than the 4° to 4.5°C estimated during times of ice growth and the 3°C estimated for glacial maxima. Coherent deep ocean circulation changes were associated with glacial oscillations in sea surface temperature.
    Type: Dataset
    Format: text/tab-separated-values, 822 data points
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