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  • 2020-2022
  • 2010-2014  (14)
  • 2010  (14)
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  • 2020-2022
  • 2010-2014  (14)
Year
  • 1
    Publication Date: 2019-09-23
    Description: The paper presents data on the chemical composition of Late Pleistocene-Holocene sediments in the Gakkel Ridge according to data on sediment core PS 70/306-3, offers a hypothetical litho-stratigraphic model, and provides data on chemo-stratigraphic horizons distinguished based on the distribution of carbonates, organic carbon, metals (Fe, Mn, Cu, Zn, Co, Ni, V, Pb), As, and P in the core. Chemical transformations of sediments at the redox barrier are discussed, along with relations between the composition of the sediments and the facies sedimentation conditions.
    Type: Article , PeerReviewed
    Format: text
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  • 2
    Publication Date: 2016-09-16
    Description: Terrestrial and marine geological archives in the Arctic contain information on environmental change through Quaternary interglacial–glacial cycles. The Arctic Palaeoclimate and its Extremes (APEX) scientific network aims to better understand the magnitude and frequency of past Arctic climate variability, with focus on the “extreme” versus the “normal” conditions of the climate system. One important motivation for studying the amplitude of past natural environmental changes in the Arctic is to better understand the role of this region in a global perspective and provide base-line conditions against which to explore potential future changes in Arctic climate under scenarios of global warming. In this review we identify several areas that are distinct to the present programme and highlight some recent advances presented in this special issue concerning Arctic palaeo-records and natural variability, including spatial and temporal variability of the Greenland Ice Sheet, Arctic Ocean sediment stratigraphy, past ice shelves and marginal marine ice sheets, and the Cenozoic history of Arctic Ocean sea ice in general and Holocene oscillations in sea ice concentrations in particular. The combined sea ice data suggest that the seasonal Arctic sea ice cover was strongly reduced during most of the early Holocene and there appear to have been periods of ice free summers in the central Arctic Ocean. This has important consequences for our understanding of the recent trend of declining sea ice, and calls for further research on causal links between Arctic climate and sea ice.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2016-09-16
    Description: As the planet cooled from peak warmth in the early Cenozoic, extensive Northern Hemisphere ice sheets developed by 2.6 Ma ago, leading to changes in the circulation of both the atmosphere and oceans. From not, vert, similar2.6 to not, vert, similar1.0 Ma ago, ice sheets came and went about every 41 ka, in pace with cycles in the tilt of Earth’s axis, but for the past 700 ka, glacial cycles have been longer, lasting not, vert, similar100 ka, separated by brief, warm interglaciations, when sea level and ice volumes were close to present. The cause of the shift from 41 ka to 100 ka glacial cycles is still debated. During the penultimate interglaciation, not, vert, similar130 to not, vert, similar120 ka ago, solar energy in summer in the Arctic was greater than at any time subsequently. As a consequence, Arctic summers were not, vert, similar5 °C warmer than at present, and almost all glaciers melted completely except for the Greenland Ice Sheet, and even it was reduced in size substantially from its present extent. With the loss of land ice, sea level was about 5 m higher than present, with the extra melt coming from both Greenland and Antarctica as well as small glaciers. The Last Glacial Maximum (LGM) peaked not, vert, similar21 ka ago, when mean annual temperatures over parts of the Arctic were as much as 20 °C lower than at present. Ice recession was well underway 16 ka ago, and most of the Northern Hemisphere ice sheets had melted by 6 ka ago. Solar energy reached a summer maximum (9% higher than at present) not, vert, similar11 ka ago and has been decreasing since then, primarily in response to the precession of the equinoxes. The extra energy elevated early Holocene summer temperatures throughout the Arctic 1–3 °C above 20th century averages, enough to completely melt many small glaciers throughout the Arctic, although the Greenland Ice Sheet was only slightly smaller than at present. Early Holocene summer sea ice limits were substantially smaller than their 20th century average, and the flow of Atlantic water into the Arctic Ocean was substantially greater. As summer solar energy decreased in the second half of the Holocene, glaciers re-established or advanced, sea ice expanded, and the flow of warm Atlantic water into the Arctic Ocean diminished. Late Holocene cooling reached its nadir during the Little Ice Age (about 1250–1850 AD), when sun-blocking volcanic eruptions and perhaps other causes added to the orbital cooling, allowing most Arctic glaciers to reach their maximum Holocene extent. During the warming of the past century, glaciers have receded throughout the Arctic, terrestrial ecosystems have advanced northward, and perennial Arctic Ocean sea ice has diminished. Here we review the proxies that allow reconstruction of Quaternary climates and the feedbacks that amplify climate change across the Arctic. We provide an overview of the evolution of climate from the hot-house of the early Cenozoic through its transition to the ice-house of the Quaternary, with special emphasis on the anomalous warmth of the middle Pliocene, early Quaternary warm times, the Mid Pleistocene transition, warm interglaciations of marine isotope stages 11, 5e, and 1, the stage 3 interstadial, and the peak cold of the last glacial maximum.
    Type: Article , PeerReviewed
    Format: text
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  • 4
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    In:  [Poster] In: International Polar Year Oslo Science, 8.-12.06.2010, Oslo, Norway .
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 5
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    In:  [Poster] In: APEX 4th International Conference and Workshop jointly with MOCA, 26.-30.05.2010, Höfn, Iceland .
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 6
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 7
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    In:  [Talk] In: International Polar Year Oslo Science, 8.-12.06.2010, Oslo, Norway .
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 8
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    In:  [Talk] In: APEX 4th International Conference and Workshop jointly with MOCA, 26.-30.05.2010, Höfn, Iceland .
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 9
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 10
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    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2023-06-27
    Keywords: ARK-XVII/2; AWI_Paleo; DEPTH, sediment/rock; Giant box corer; GKG; Grain size, CILAS 1180 Laser Particle Analyser; Grain size, sieving; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS59/217-2; PS59 AMORE; Size fraction 〈 0.040 µm, 〉14.6 phi; Size fraction 〉 2639 µm, 〈-1.4 phi; Size fraction 0.043-0.040 µm, 14.5-14.6 phi; Size fraction 0.046-0.043 µm, 14.4-14.5 phi; Size fraction 0.050-0.046 µm, 14.3-14.4 phi; Size fraction 0.053-0.050 µm, 14.2-14.3 phi; Size fraction 0.057-0.053 µm, 14.1-14.2 phi; Size fraction 0.061-0.057 µm, 14.0-14.1 phi; Size fraction 0.065-0.061 µm, 13.9-14.0 phi; Size fraction 0.070-0.065 µm, 13.8-13.9 phi; Size fraction 0.075-0.070 µm, 13.7-13.8 phi; Size fraction 0.081-0.075 µm, 13.6-13.7 phi; Size fraction 0.086-0.081 µm, 13.5-13.6 phi; Size fraction 0.093-0.086 µm, 13.4-13.5 phi; Size fraction 0.099-0.093 µm, 13.3-13.4 phi; Size fraction 0.106-0.099 µm, 13.2-13.3 phi; Size fraction 0.114-0.106 µm, 13.1-13.2 phi; Size fraction 0.122-0.114 µm, 13.0-13.1 phi; Size fraction 0.131-0.122 µm, 12.9-13.0 phi; Size fraction 0.140-0.131 µm, 12.8-12.9 phi; Size fraction 0.150-0.140 µm, 12.7-12.8 phi; Size fraction 0.161-0.150 µm, 12.6-12.7 phi; Size fraction 0.173-0.161 µm, 12.5-12.6 phi; Size fraction 0.185-0.173 µm, 12.4-12.5 phi; Size fraction 0.198-0.185 µm, 12.3-12.4 phi; Size fraction 0.213-0.198 µm, 12.2-12.3 phi; Size fraction 0.228-0.213 µm, 12.1-12.2 phi; Size fraction 0.244-0.228 µm, 12.0-12.1 phi; Size fraction 0.262-0.244 µm, 11.9-12.0 phi; Size fraction 0.280-0.262 µm, 11.8-11.9 phi; Size fraction 0.301-0.280 µm, 11.7-11.8 phi; Size fraction 0.322-0.301 µm, 11.6-11.7 phi; Size fraction 0.345-0.322 µm, 11.5-11.6 phi; Size fraction 0.370-0.345 µm, 11.4-11.5 phi; Size fraction 0.397-0.370 µm, 11.3-11.4 phi; Size fraction 0.425-0.397 µm, 11.2-11.3 phi; Size fraction 0.456-0.425 µm, 11.1-11.2 phi; Size fraction 0.488-0.456 µm, 11.0-11.1 phi; Size fraction 0.523-0.488 µm, 10.9-11.0 phi; Size fraction 0.561-0.523 µm, 10.8-10.9 phi; Size fraction 0.601-0.561 µm, 10.7-10.8 phi; Size fraction 0.644-0.601 µm, 10.6-10.7 phi; Size fraction 0.691-0.644 µm, 10.5-10.6 phi; Size fraction 0.740-0.691 µm, 10.4-10.5 phi; Size fraction 0.793-0.740 µm, 10.3-10.4 phi; Size fraction 0.850-0.793 µm, 10.2-10.3 phi; Size fraction 0.911-0.850 µm, 10.1-10.2 phi; Size fraction 0.977-0.911 µm, 10.0-10.1 phi; Size fraction 1.047-0.977 µm, 9.9-10.0 phi; Size fraction 1.122-1.047 µm, 9.8-9.9 phi; Size fraction 1.202-1.122 µm, 9.7-9.8 phi; Size fraction 1.289-1.202 µm, 9.6-9.7 phi; Size fraction 1.381-1.289 µm, 9.5-9.6 phi; Size fraction 1.480-1.381 µm, 9.4-9.5 phi; Size fraction 1.586-1.480 µm, 9.3-9.4 phi; Size fraction 1.700-1.586 µm, 9.2-9.3 phi; Size fraction 1.822-1.700 µm, 9.1-9.2 phi; Size fraction 1.953-1.822 µm, 9.0-9.1 phi; Size fraction 10.309-9.618 µm, 6.6-6.7 phi; Size fraction 1000.000-933.033 µm, 0.0-0.1 phi; Size fraction 101.532-94.732 µm, 3.3-3.4 phi; Size fraction 1071.773-1000.000 µm, (-0.1)-0.0 phi; Size fraction 108.819-101.532 µm, 3.2-3.3 phi; Size fraction 11.049-10.309 µm, 6.5-6.6 phi; Size fraction 11.842-11.049 µm, 6.4-6.5 phi; Size fraction 1148.698-1071.773 µm, (-0.2) to (-0.1) phi; Size fraction 116.629-108.819 µm, 3.1-3.2 phi; Size fraction 12.691-11.842 µm, 6.3-6.4 phi; Size fraction 1231.144-1148.698 µm, (-0.3) to (-0.2) phi; Size fraction 125.000-116.629 µm, 3.0-3.1 phi; Size fraction 13.602-12.691 µm, 6.2-6.3 phi; Size fraction 1319.508-1231.144 µm, (-0.4) to (-0.3) phi; Size fraction 133.972-125.000 µm, 2.9-3.0 phi; Size fraction 14.579-13.602 µm, 6.1-6.2 phi; Size fraction 1414.214-1319.508 µm, (-0.5) to (-0.4) phi; Size fraction 143.587-133.972 µm, 2.8-2.9 phi; Size fraction 15.625-14.579 µm, 6.0-6.1 phi; Size fraction 1515.717-1414.214 µm, (-0.6) to (-0.5) phi; Size fraction 153.893-143.587 µm, 2.7-2.8 phi; Size fraction 16.746-15.625 µm, 5.9-6.0 phi; Size fraction 1624.505-1515.717 µm, (-0.7) to (-0.6) phi; Size fraction 164.938-153.893 µm, 2.6-2.7 phi; Size fraction 17.948-16.746 µm, 5.8-5.9 phi; Size fraction 1741.101-1624.505 µm, (-0.8) to (-0.7) phi; Size fraction 176.777-164.938 µm, 2.5-2.6 phi; Size fraction 1866.066-1741.101 µm, (-0.9) to (-0.8) phi; Size fraction 189.465-176.777 µm, 2.4-2.5 phi; Size fraction 19.237-17.948 µm, 5.7-5.8 phi; Size fraction 2.093-1.953 µm, 8.9-9.0 phi; Size fraction 2.244-2.093 µm, 8.8-8.9 phi; Size fraction 2.405-2.244 µm, 8.7-8.8 phi; Size fraction 2.577-2.405 µm, 8.6-8.7 phi; Size fraction 2.762-2.577 µm, 8.5-8.6 phi; Size fraction 2.960-2.762 µm, 8.4-8.5 phi; Size fraction 20.617-19.237 µm, 5.6-5.7 phi; Size fraction 2000.000-1866.066 µm, (-1.0) to (-0.9) phi; Size fraction 203.063-189.465 µm, 2.3-2.4 phi; Size fraction 2143.547-2000.000 µm, (-1.1) to (-1.0) phi; Size fraction 217.638-203.063 µm, 2.2-2.3 phi; Size fraction 22.097-20.617 µm, 5.5-5.6 phi; Size fraction 2297.397-2143.547 µm, (-1.2) to (-1.1) phi; Size fraction 23.683-22.097 µm, 5.4-5.5 phi; Size fraction 233.258-217.638 µm, 2.1-2.2 phi; Size fraction 2462.289-2297.397 µm, (-1.3) to (-1.2) phi; Size fraction 25.383-23.683 µm, 5.3-5.4 phi; Size fraction 250.000-233.258 µm, 2.0-2.1 phi; Size fraction 2639.016-2462.289 µm, (-1.4) to (-1.3) phi; Size fraction 267.943-250.000 µm, 1.9-2.0 phi; Size fraction 27.205-25.383 µm, 5.2-5.3 phi; Size fraction 287.175-267.943 µm, 1.8-1.9 phi; Size fraction 29.157-27.205 µm, 5.1-5.2 phi; Size fraction 3.173-2.960 µm, 8.3-8.4 phi; Size fraction 3.401-3.173 µm, 8.2-8.3 phi; Size fraction 3.645-3.401 µm, 8.1-8.2 phi; Size fraction 3.906-3.645 µm, 8.0-8.1 phi; Size fraction 307.786-287.175 µm, 1.7-1.8 phi; Size fraction 31.250-29.157 µm, 5.0-5.1 phi; Size fraction 329.877-307.786 µm, 1.6-1.7 phi; Size fraction 33.493-31.250 µm, 4.9-5.0 phi; Size fraction 35.897-33.493 µm, 4.8-4.9 phi; Size fraction 353.553-329.877 µm, 1.5-1.6 phi; Size fraction 378.929-353.553 µm, 1.4-1.5 phi; Size fraction 38.473-35.897 µm, 4.7-4.8 phi; Size fraction 4.187-3.906 µm, 7.9-8.0 phi; Size fraction 4.487-4.187 µm, 7.8-7.9 phi; Size fraction 4.809-4.487 µm, 7.7-7.8 phi; Size fraction 406.126-378.929 µm, 1.3-1.4 phi; Size fraction 41.235-38.473 µm, 4.6-4.7 phi; Size fraction 435.275-406.126 µm, 1.2-1.3 phi; Size fraction 44.194-41.235 µm, 4.5-4.6 phi; Size fraction 466.516-435.275 µm, 1.1-1.2 phi; Size fraction 47.366-44.194 µm, 4.4-4.5 phi; Size fraction 5.154-4.809 µm, 7.6-7.7 phi; Size fraction 5.524-5.154 µm, 7.5-7.6 phi; Size fraction 5.921-5.524 µm, 7.4-7.5 phi; Size fraction 50.766-47.366 µm, 4.3-4.4 phi; Size fraction 500.000-466.516 µm, 1.0-1.1 phi; Size fraction 535.887-500.000 µm, 0.9-1.0 phi; Size fraction 54.409-50.766 µm, 4.2-4.3 phi; Size fraction 574.349-535.887 µm, 0.8-0.9 phi; Size fraction 58.315-54.409 µm, 4.1-4.2 phi; Size fraction 6.346-5.921 µm, 7.3-7.4 phi; Size fraction 6.801-6.346 µm, 7.2-7.3 phi; Size fraction 615.572-574.349 µm, 0.7-0.8 phi; Size fraction 62.500-58.315 µm, 4.0-4.1 phi; Size fraction 659.754-615.572 µm, 0.6-0.7 phi; Size fraction 66.986-62.500 µm, 3.9-4.0 phi; Size fraction 7.289-6.801 µm, 7.1-7.2 phi; Size fraction 7.813-7.289 µm, 7.0-7.1 phi; Size fraction 707.107-659.754 µm, 0.5-0.6 phi; Size fraction 71.794-66.986 µm, 3.8-3.9 phi; Size fraction 757.858-707.107 µm, 0.4-0.5 phi; Size fraction 76.947-71.794 µm, 3.7-3.8 phi; Size fraction 8.373-7.813 µm, 6.9-7.0 phi; Size fraction 8.974-8.373 µm, 6.8-6.9 phi; Size fraction 812.252-757.858 µm, 0.3-0.4 phi; Size fraction 82.469-76.947 µm, 3.6-3.7 phi; Size fraction 870.551-812.252 µm, 0.2-0.3 phi; Size fraction 88.388-82.469 µm, 3.5-3.6 phi; Size fraction 9.618-8.974 µm, 6.7-6.8 phi; Size fraction 933.033-870.551 µm, 0.1-0.2 phi; Size fraction 94.732-88.388 µm, 3.4-3.5 phi
    Type: Dataset
    Format: text/tab-separated-values, 7938 data points
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