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  • 1
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    Sea-level and deep-sea-temperature variability over the past 5.3 million years (2014)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2014-04-18
    Description: Ice volume (and hence sea level) and deep-sea temperature are key measures of global climate change. Sea level has been documented using several independent methods over the past 0.5 million years (Myr). Older periods, however, lack such independent validation; all existing records are related to deep-sea oxygen isotope (delta(18)O) data that are influenced by processes unrelated to sea level. For deep-sea temperature, only one continuous high-resolution (Mg/Ca-based) record exists, with related sea-level estimates, spanning the past 1.5 Myr. Here we present a novel sea-level reconstruction, with associated estimates of deep-sea temperature, which independently validates the previous 0-1.5 Myr reconstruction and extends it back to 5.3 Myr ago. We find that deep-sea temperature and sea level generally decreased through time, but distinctly out of synchrony, which is remarkable given the importance of ice-albedo feedbacks on the radiative forcing of climate. In particular, we observe a large temporal offset during the onset of Plio-Pleistocene ice ages, between a marked cooling step at 2.73 Myr ago and the first major glaciation at 2.15 Myr ago. Last, we tentatively infer that ice sheets may have grown largest during glacials with more modest reductions in deep-sea temperature.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rohling, E J -- Foster, G L -- Grant, K M -- Marino, G -- Roberts, A P -- Tamisiea, M E -- Williams, F -- England -- Nature. 2014 Apr 24;508(7497):477-82. doi: 10.1038/nature13230. Epub 2014 Apr 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Research School of Earth Sciences, The Australian National University, Canberra 0200, Australia [2] Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK. ; Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK. ; Research School of Earth Sciences, The Australian National University, Canberra 0200, Australia. ; National Oceanography Centre, Joseph Proudman Building, Liverpool L3 5DA, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24739960" target="_blank"〉PubMed〈/a〉
    Keywords: Foraminifera ; History, Ancient ; Ice Cover ; Mediterranean Sea ; Oxygen Isotopes ; Reproducibility of Results ; Seawater/*analysis ; *Temperature ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    Rapid coupling between ice volume and polar temperature over the past 150,000 years (2012)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2012-11-16
    Description: Current global warming necessitates a detailed understanding of the relationships between climate and global ice volume. Highly resolved and continuous sea-level records are essential for quantifying ice-volume changes. However, an unbiased study of the timing of past ice-volume changes, relative to polar climate change, has so far been impossible because available sea-level records either were dated by using orbital tuning or ice-core timescales, or were discontinuous in time. Here we present an independent dating of a continuous, high-resolution sea-level record in millennial-scale detail throughout the past 150,000 years. We find that the timing of ice-volume fluctuations agrees well with that of variations in Antarctic climate and especially Greenland climate. Amplitudes of ice-volume fluctuations more closely match Antarctic (rather than Greenland) climate changes. Polar climate and ice-volume changes, and their rates of change, are found to covary within centennial response times. Finally, rates of sea-level rise reached at least 1.2 m per century during all major episodes of ice-volume reduction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grant, K M -- Rohling, E J -- Bar-Matthews, M -- Ayalon, A -- Medina-Elizalde, M -- Ramsey, C Bronk -- Satow, C -- Roberts, A P -- England -- Nature. 2012 Nov 29;491(7426):744-7. doi: 10.1038/nature11593. Epub 2012 Nov 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, European Way, Southampton SO14 3ZH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23151478" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antarctic Regions ; Anthozoa ; *Climate ; Climate Change/*history/statistics & numerical data ; Feedback ; Foraminifera/isolation & purification ; Geologic Sediments/analysis ; Greenland ; History, Ancient ; *Ice Cover/chemistry ; Indian Ocean ; Mediterranean Sea ; Plankton/isolation & purification ; Seawater/analysis/chemistry ; *Temperature ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
    Location Call Number Expected Availability
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    PAPER CURRENT
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