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  • 1
    Call number: AWI G5-00-0092
    In: Quaternary Science Reviews
    Type of Medium: Monograph available for loan
    Pages: S. 1-479 : Abb. ; 30 cm
    ISSN: 0277-3791
    Series Statement: Quaternary Science Reviews 19, 2000, 1-5
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Publication Date: 2012-12-12
    Description: Given the coarse scales of coupled atmosphere-ocean global climate models, regional climate models (RCMs) are increasingly relied upon for studies at scales appropriate for many impacts studies. We use outputs from an ensemble of RCMs participating in the North American Regional Climate Change Assessment Program (NARCCAP) to investigate potential changes in seasonal air temperature and precipitation between present (1971–2000) and future (2041–2070) time periods across the northeast United States. The models show a consistent modest cold bias each season and are wetter than observations in winter, spring, and summer. Agreement in spatial variability and pattern correlation is good for air temperature and marginal for precipitation. Two methods were used to evaluate robustness of the mid 21st century change projections; one which estimates model reliability to generate multimodel means and assess uncertainty and a second which depicts multimodel projections by separating lack of climate change signal from lack of model agreement. For air temperature we find changes of 2–3°C are outside the level of internal natural variability and significant at all northeast grid cells. Signals of precipitation increases in winter are significant region wide. Regionally averaged precipitation changes for spring, summer, and autumn are within the level of natural variability. This study raises confidence in mid 21st century temperature projections across the northeast United States and illustrates the value in comprehensive assessments of regional climate model projections over time and space scales where natural variability may obscure signals of anthropogenically forced changes.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2003-10-18
    Description: Many papers have referred to a "Medieval Warm Period." But how well defined is climate in this period, and was it as warm as or warmer than it is today? In their Perspective, Bradley et al. review the evidence and conclude that although the High Medieval (1100 to 1200 A.D.) was warmer than subsequent centuries, it was not warmer than the late 20th century. Moreover, the warmest Medieval temperatures were not synchronous around the globe. Large changes in precipitation patterns are a particular characteristic of "High Medieval" time. The underlying mechanisms for such changes must be elucidated further to inform the ongoing debate on natural climate variability and anthropogenic climate change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bradley, Raymond S -- Hughes, Malcolm K -- Diaz, Henry F -- New York, N.Y. -- Science. 2003 Oct 17;302(5644):404-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Climate System Research Center, Department of Geosciences, University of Massachusetts, Amherst, MA 01003, USA. rbradley@geo.umass.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14563996" 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
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  • 4
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-02-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weiss, H -- Bradley, R S -- New York, N.Y. -- Science. 2001 Jan 26;291(5504):609-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Anthropology and Near Eastern Languages and Civilizations, Yale University, New Haven, CT 06520, USA. harvey.weiss@yale.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11158667" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture ; *Archaeology ; *Climate ; *Disasters ; Forecasting ; Humans ; *Social Conditions ; Socioeconomic Factors
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-06-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bradley, R S -- New York, N.Y. -- Science. 2001 Jun 15;292(5524):2011.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11411489" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Ecosystem ; *Greenhouse Effect ; Ice ; Oceans and Seas ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-06-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bradley, R S -- Briffa, K R -- Crowley, T J -- Hughes, M K -- Jones, P D -- Mann, M E -- New York, N.Y. -- Science. 2001 Jun 15;292(5524):2011-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11411490" target="_blank"〉PubMed〈/a〉
    Keywords: *Climate ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2009-12-08
    Description: Global temperatures are known to have varied over the past 1500 years, but the spatial patterns have remained poorly defined. We used a global climate proxy network to reconstruct surface temperature patterns over this interval. The Medieval period is found to display warmth that matches or exceeds that of the past decade in some regions, but which falls well below recent levels globally. This period is marked by a tendency for La Nina-like conditions in the tropical Pacific. The coldest temperatures of the Little Ice Age are observed over the interval 1400 to 1700 C.E., with greatest cooling over the extratropical Northern Hemisphere continents. The patterns of temperature change imply dynamical responses of climate to natural radiative forcing changes involving El Nino and the North Atlantic Oscillation-Arctic Oscillation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mann, Michael E -- Zhang, Zhihua -- Rutherford, Scott -- Bradley, Raymond S -- Hughes, Malcolm K -- Shindell, Drew -- Ammann, Caspar -- Faluvegi, Greg -- Ni, Fenbiao -- New York, N.Y. -- Science. 2009 Nov 27;326(5957):1256-60. doi: 10.1126/science.1177303.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Meteorology and Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA 16802, USA. mann@meteo.psu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19965474" 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
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  • 8
    Publication Date: 2006-06-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bradley, Raymond S -- Vuille, Mathias -- Diaz, Henry F -- Vergara, Walter -- New York, N.Y. -- Science. 2006 Jun 23;312(5781):1755-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Climate System Research Center, Department of Geosciences, University of Massachusetts, Amherst, MA 01003, USA. rbradley@geo.umass.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16794068" 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
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  • 9
    Publication Date: 2009-09-05
    Description: The temperature history of the first millennium C.E. is sparsely documented, especially in the Arctic. We present a synthesis of decadally resolved proxy temperature records from poleward of 60 degrees N covering the past 2000 years, which indicates that a pervasive cooling in progress 2000 years ago continued through the Middle Ages and into the Little Ice Age. A 2000-year transient climate simulation with the Community Climate System Model shows the same temperature sensitivity to changes in insolation as does our proxy reconstruction, supporting the inference that this long-term trend was caused by the steady orbitally driven reduction in summer insolation. The cooling trend was reversed during the 20th century, with four of the five warmest decades of our 2000-year-long reconstruction occurring between 1950 and 2000.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaufman, Darrell S -- Schneider, David P -- McKay, Nicholas P -- Ammann, Caspar M -- Bradley, Raymond S -- Briffa, Keith R -- Miller, Gifford H -- Otto-Bliesner, Bette L -- Overpeck, Jonathan T -- Vinther, Bo M -- Arctic Lakes 2k Project Members -- New York, N.Y. -- Science. 2009 Sep 4;325(5945):1236-9. doi: 10.1126/science.1173983.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, AZ 86011, USA. darrell.kaufman@nau.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19729653" 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
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  • 10
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1978-04-21
    Description: Field observations on northeast Ellesmere Island indicate that the maximum advance of the northwest Greenland Ice Sheet was about 100 kilometers beyond its present margin. This occurred before the outermost Ellesmere Island ice advance, which took place more than 30,000 years before present (B.P.). Recession from the Ellesmere Island ice margin began at least 28,000 to 30,000 and possibly more than 35,000 years B.P. During this sequence of glacial events, significant land areas remained free of ice. The late Wisconsin ice extent along both northeast Ellesmere Island and northwest Greenland was extremely limited, leaving an ice-free corridor along Kennedy and Robeson channels. Recession from these ice margins is indicated by initial postglacial emergence around 8100 to 8400 years B.P. The relatively minor extent of late Wisconsin ice in the High Arctic probably reflects a period of extreme aridity occasioned by the buildup of the Laurentide Ice Sheet to the south.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England, J -- Bradley, R S -- New York, N.Y. -- Science. 1978 Apr 21;200(4339):265-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17745546" 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
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