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  • American Association for the Advancement of Science (AAAS)  (3)
  • 2005-2009  (3)
  • 1935-1939
  • 2009  (2)
  • 2006  (1)
  • 1937
  • 1
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    Ice age terminations (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-10-10
    Description: 230Th-dated oxygen isotope records of stalagmites from Sanbao Cave, China, characterize Asian Monsoon (AM) precipitation through the ends of the third- and fourthmost recent ice ages. As a result, AM records for the past four glacial terminations can now be precisely correlated with those from ice cores and marine sediments, establishing the timing and sequence of major events. In all four cases, observations are consistent with a classic Northern Hemisphere summer insolation intensity trigger for an initial retreat of northern ice sheets. Meltwater and icebergs entering the North Atlantic alter oceanic and atmospheric circulation and associated fluxes of heat and carbon, causing increases in atmospheric CO2 and Antarctic temperatures that drive the termination in the Southern Hemisphere. Increasing CO2 and summer insolation drive recession of northern ice sheets, with probable positive feedbacks between sea level and CO2.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cheng, Hai -- Edwards, R Lawrence -- Broecker, Wallace S -- Denton, George H -- Kong, Xinggong -- Wang, Yongjin -- Zhang, Rong -- Wang, Xianfeng -- New York, N.Y. -- Science. 2009 Oct 9;326(5950):248-52. doi: 10.1126/science.1177840.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19815769" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    High-frequency Holocene glacier fluctuations in New Zealand differ from the northern signature (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-05-02
    Description: Understanding the timings of interhemispheric climate changes during the Holocene, along with their causes, remains a major problem of climate science. Here, we present a high-resolution 10Be chronology of glacier fluctuations in New Zealand's Southern Alps over the past 7000 years, including at least five events during the last millennium. The extents of glacier advances decreased from the middle to the late Holocene, in contrast with the Northern Hemisphere pattern. Several glacier advances occurred in New Zealand during classic northern warm periods. These findings point to the importance of regional driving and/or amplifying mechanisms. We suggest that atmospheric circulation changes in the southwest Pacific were one important factor in forcing high-frequency Holocene glacier fluctuations in New Zealand.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schaefer, Joerg M -- Denton, George H -- Kaplan, Michael -- Putnam, Aaron -- Finkel, Robert C -- Barrell, David J A -- Andersen, Bjorn G -- Schwartz, Roseanne -- Mackintosh, Andrew -- Chinn, Trevor -- Schluchter, Christian -- New York, N.Y. -- Science. 2009 May 1;324(5927):622-5. doi: 10.1126/science.1169312.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geochemistry, Lamont-Doherty Earth Observatory (LDEO), Palisades, NY 10964, USA. schaefer@ldeo.columbia.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19407198" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Near-synchronous interhemispheric termination of the last glacial maximum in mid-latitudes (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-10
    Description: Isotopic records from polar ice cores imply globally asynchronous warming at the end of the last glaciation. However, 10Be exposure dates show that large-scale retreat of mid-latitude Last Glacial Maximum glaciers commenced at about the same time in both hemispheres. The timing of retreat is consistent with the onset of temperature and atmospheric CO2 increases in Antarctic ice cores. We suggest that a global trend of rising summer temperatures at the end of the Last Glacial Maximum was obscured in North Atlantic regions by hypercold winters associated with unusually extensive winter sea ice.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schaefer, Joerg M -- Denton, George H -- Barrell, David J A -- Ivy-Ochs, Susan -- Kubik, Peter W -- Andersen, Bjorn G -- Phillips, Fred M -- Lowell, Thomas V -- Schluchter, Christian -- New York, N.Y. -- Science. 2006 Jun 9;312(5779):1510-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lamont-Doherty Earth Observatory (L-DEO), Palisades, NY 10964, USA. schaefer@ldeo.columbia.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16763146" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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    PAPER CURRENT
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