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  • 1
    Monograph available for loan
    Monograph available for loan
    Problematic ice sheets (1998)
    Oxford : Pergamon
    Details Availability
    Call number: AWI G7-98-0169
    Type of Medium: Monograph available for loan
    Pages: III, 142 S. , Ill., graph. Darst.
    ISSN: 1040-6182
    Series Statement: Quaternary International 45/46
    Note: Contents: Preface / W. Karlén, J. Lundqvist and N. Rutter. - Late-Weichselian ice sheets in Arctic and Pacific Siberia / M. G. Grosswald. - The last ice sheet of the Kara Sea: terrestrial constraints on its age / A. Astakhov. - Stratigraphy and paleogeography of the Sartan Glaciation in West Siberia / S. A. Arkhipov. - The relationship of massive ground ice and the late Pleistocene history of northwest Siberia / F. A. Michel. - Scanning electron microscopy of pleistocene sands from Yamal and Taz Peninsulas, Ob River Estuary, Northwestern Siberia / W. C. Mahaney. - The quaternary vegetation and landscape evolution of Novaya Zemlya in the light of palynological records / L. Serebryanny and E. Malyasova. - Reconstruction of the 2.4 million km2 late pleistocene ice sheet on the Tibetan Plateau and its impact on the Tibetan Plateau and its impact on the global climate / M. Kuhle. - On the problem of Quaternary glaciations, and the extent and patterns of pleistocene ice cover in the Qinghai-Xizang (Tibet) Plateau / Z. Benzing and N. Rutter. - Extent and spatial distribution of pleistocene glaciations in Eastern Tibet / F. Lehmkuhl. - The sequence of the quaternary glaciation in the Bayan Har Mountains / Z. Shangzhe and L. Jijun.
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
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    Freshwater forcing of abrupt climate change during the last glaciation (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-07-14
    Description: Large millennial-scale fluctuations of the southern margin of the North American Laurentide Ice Sheet occurred during the last deglaciation, when the margin was located between about 43 degrees and 49 degrees N. Fluctuations of the ice margin triggered episodic increases in the flux of freshwater to the North Atlantic by rerouting continental runoff from the Mississippi River drainage to the Hudson or St. Lawrence Rivers. We found that periods of increased freshwater flow to the North Atlantic occurred at the same time as reductions in the formation of North Atlantic Deep Water, thus providing a mechanism for observed climate variability that may be generally characteristic of times of intermediate global ice volume.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Clark, P U -- Marshall, S J -- Clarke, G K -- Hostetler, S W -- Licciardi, J M -- Teller, J T -- New York, N.Y. -- Science. 2001 Jul 13;293(5528):283-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geosciences, Oregon State University, Corvallis, OR 97333, USA. clarkp@ucs.orst.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11452120" 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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    Identification of Younger Dryas outburst flood path from Lake Agassiz to the Arctic Ocean (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-04-03
    Description: The melting Laurentide Ice Sheet discharged thousands of cubic kilometres of fresh water each year into surrounding oceans, at times suppressing the Atlantic meridional overturning circulation and triggering abrupt climate change. Understanding the physical mechanisms leading to events such as the Younger Dryas cold interval requires identification of the paths and timing of the freshwater discharges. Although Broecker et al. hypothesized in 1989 that an outburst from glacial Lake Agassiz triggered the Younger Dryas, specific evidence has so far proved elusive, leading Broecker to conclude in 2006 that "our inability to identify the path taken by the flood is disconcerting". Here we identify the missing flood path-evident from gravels and a regional erosion surface-running through the Mackenzie River system in the Canadian Arctic Coastal Plain. Our modelling of the isostatically adjusted surface in the upstream Fort McMurray region, and a slight revision of the ice margin at this time, allows Lake Agassiz to spill into the Mackenzie drainage basin. From optically stimulated luminescence dating we have determined the approximate age of this Mackenzie River flood into the Arctic Ocean to be shortly after 13,000 years ago, near the start of the Younger Dryas. We attribute to this flood a boulder terrace near Fort McMurray with calibrated radiocarbon dates of over 11,500 years ago. A large flood into the Arctic Ocean at the start of the Younger Dryas leads us to reject the widespread view that Agassiz overflow at this time was solely eastward into the North Atlantic Ocean.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Murton, Julian B -- Bateman, Mark D -- Dallimore, Scott R -- Teller, James T -- Yang, Zhirong -- England -- Nature. 2010 Apr 1;464(7289):740-3. doi: 10.1038/nature08954.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Permafrost Laboratory, Department of Geography, University of Sussex, Brighton BN1 9QJ, UK. .b.murton@sussex.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20360738" target="_blank"〉PubMed〈/a〉
    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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  • 4
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    Freshwater outburst from Lake Superior as a trigger for the cold event 9300 years ago (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-05-01
    Description: Paleoclimate proxy records reveal a pervasive cooling event with a Northern Hemispheric extent approximately 9300 years ago. Coeval changes in the oceanic circulation of the North Atlantic imply freshwater forcing. However, the source, magnitude, and routing of meltwater have remained unknown. Located in central North America, Lake Superior is a key site for regulating the outflow of glacial meltwater to the oceans. Here, we show evidence for an approximately 45-meter rapid lake-level fall in this basin, centered on 9300 calibrated years before the present, due to the failure of a glacial drift dam on the southeast corner of the lake. We ascribe the widespread climate anomaly approximately 9300 years ago to this freshwater outburst delivered to the North Atlantic Ocean through the Lake Huron-North Bay-Ottawa River-St. Lawrence River valleys.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yu, Shi-Yong -- Colman, Steven M -- Lowell, Thomas V -- Milne, Glenn A -- Fisher, Timothy G -- Breckenridge, Andy -- Boyd, Matthew -- Teller, James T -- New York, N.Y. -- Science. 2010 Jun 4;328(5983):1262-6. doi: 10.1126/science.1187860. Epub 2010 Apr 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Large Lakes Observatory, University of Minnesota Duluth, Duluth, MN 55812, USA. syu2@tulane.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20430972" 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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  • 5
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    Quaternary climatic changes over Southern Arabia and the Thar Desert, India (2002)
    In:  Geological Society Special Publication 195: 301-316.
    Details
    Publication Date: 2002-01-01
    Description: The distribution of sand dunes over the southern half of Arabia conforms to the influence of two wind systems: the northern Shamal, which is a strong wind that blows to the SSE down the Persian (Arabian) Gulf and then swings to the SW across the hyperarid Rub al Khali towards North Yemen; and the strong winds of the SW Monsoon system, which were responsible for forming linear dunes that trend north-south in the Wahiba Sands of eastern Oman and SW--NE in the Thar Desert (NW India). In the Thar Desert, the SW Monsoon alternates with the weaker NE Monsoon. The dating of exposures of older dune systems by isotopic, radiometric and optically stimulated luminescence (OSL) analyses has shown that the Shamal was active throughout the latter part of the Quaternary period, and probably as long ago as Mid-Miocene time (c. 15 Ma). At times of glacial maxima, when global sea level was some 100-120 m or more lower than now, siliciclastic and carbonate grains were deflated from the exposed surface of the Persian Gulf and transported into the NE Rub al Khali within the United Arab Emirates. It is suspected that occasionally the Shamal also transported some quartz sands from the NW onto the exposed narrow continental shelf of SE Arabia, with silt-size particles being carried into the Arabian Sea. The SW Monsoon, on the other hand, was re-established over the coast of SE Arabia several millennia after the last glacial maximum and was fully established near the coast of SE Arabia during the early Holocene interglacial after the atmospheric high-pressure system associated with the glacial period had become weaker. Early during the Holocene interglacial periods when the SW Monsoon dominated, a combination of quartz and carbonate sands was deflated from the exposed continental shelf and transported to the north into the Wahiba Sands. Aeolian activity in the Thar Desert also peaked during this period of transition from full glacial to interglacial conditions. The dune systems of SE Arabia overlie the distal edges of older alluvial fans that in Oman date back at least 350 ka. The sediments of some of these fluvial sequences in Oman reached the Arabian Sea via Wadi Batha, only to be removed by along-shore currents driven by the SW Monsoon. In the Thar Desert, the supply of aeolian sediment is mostly from fluvial sources. Marine sediments from the Arabian Sea between Arabia and Thar record the contrasting effects of the Shamal and the SW Monsoon: the former mostly as a source of wind-blown dust from Arabia and the latter by causing upwelling of nutrient-rich waters leading to organic blooms.
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  • 6
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    Importance of freshwater injections into the Arctic Ocean in triggering the Younger Dryas cooling (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-11-16
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 7
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    Relative timing of the Storegga submarine slide, methane release, and climate change during the 8.2 ka cold event (2011)
    Sage
    In: Holocene
    Details
    Publication Date: 2011-09-29
    Description: This paper highlights the similarity in the timing between the 8.2 ka cold event across the North Atlantic region and one of the world’s largest underwater slides, the Storegga submarine landslide that took place on the continental slope west of Norway. We argue on the basis of a reinterpretation of the age of tsunami deposits that date the slide, as well as published ages of sediment directly resting upon the slide surface, that the slide occurred between 8100 and 8200 cal. yr, near the end of the 8.2 ka cold event. Because sediment exposed at the base of the slide contained less methane-gas-hydrate c . 8200 years ago than exists today and because Greenland ice cores do not show an increase in methane at the time of the slide, it is argued here that the slide did not release significant volumes of methane to the atmosphere and did not contribute to any change in temperature during or after the 8.2 ka cold event.
    Print ISSN: 0959-6836
    Electronic ISSN: 1477-0911
    Topics: Geography , Geosciences
    Published by Sage
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  • 8
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    Younger Dryas freshwater injections to the ocean [Earth, Atmospheric, and Planetary Sciences] (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-12-05
    Description: The cause of past climate change has been the focus of many studies in recent years. Various explanations have been advanced to explain the record of Quaternary climate change identified in sediments on continents, in oceans, and in the ice caps of Greenland and Antarctica. Important in this is the...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 9
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    Mapping and measuring Lake Agassiz strandlines in North Dakota and Manitoba using LiDAR DEM data: Comparing techniques, revising correlations, and interpreting anomalous isostatic rebound gradients (2015)
    Geological Society of America (GSA)
    Details
    Publication Date: 2015-03-07
    Description: Based on light detection and ranging (LiDAR) digital elevation model (DEM) data at 1 m spatial resolution, Lake Agassiz strandlines were mapped and their elevations determined in northeastern North Dakota and southern Manitoba. Two different techniques for determining strandline elevations from LiDAR imagery are compared: one based on measuring the crests of constructional beaches, and the other using the elevation of slope breaks along the shorelines defined by shadows on the LiDAR hillshade map. Our measurements on Lake Agassiz strandlines show that previous correlations of younger strandlines around the Pembina delta, accepted for more than a century, are incorrect; the Gladstone, Ojata, and Emerado strandlines south of the delta are offset by 10 m from their namesakes to the north and so are equivalent to the Ojata, Emerado, and Hillsboro strandlines, respectively. Furthermore, anomalously low gradients for the Ojata and Emerado strandlines around the Pembina delta are interpreted as resulting from postdepositional compaction of underlying fine sediment. Elevations on the isostatically rebounded strandlines confirm that older (higher) ones have steeper northward-rising elevations, and that gradients on those strandlines can be used as proxies for relative age.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 10
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    Glacial Lake Agassiz (1985)
    Taylor & Francis
    Details
    Publication Date: 1985-02-01
    Print ISSN: 0004-0851
    Topics: Geography , Geosciences
    Published by Taylor & Francis
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