Last Glacial loess in the conterminous USA |
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| Institution: | 1. Department of Geoscience, The University of Iowa, Iowa City, Iowa 52242, USA;2. US Geological Survey, MS 980, Box 25046, Federal Center, Denver, CO 80225, USA;3. Institute of Geography and Earth Sciences, University of Wales, Aberystwyth, Wales SY23 3DB, UK;1. Department of Physical Geography, Stockholm University, 10691 Stockholm, Sweden;2. Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany;3. Département des Sciences de la Terre et de l''atmosphère, Université du Québec à Montréal, CP 8888 Succ. Centre-Ville, Montréal, Quebec H3C 3P8, Canada;4. Freiberg Instruments, Delfter Straße 6, 09599 Freiberg, Germany;5. Department of Geography, Justus-Liebig-University, Senckenbergstr. 1, 35390 Gießen, Germany;1. School of Business, University of Kansas, 1300 Sunnyside Ave., Lawrence, KS 66045, USA;2. Department of Geography, University of Kansas, 1300 Sunnyside Ave., Lawrence, KS 66045, USA;3. Division of Earth and Ecosystems Sciences, Desert Research Institute, 2215 Raggio Pkwy., Reno, NV 89512, USA;4. Natural Resources Canada, Geological Survey of Canada, 601 Booth St., Ottawa, ON K1A 0E8, Canada;1. USU Luminescence Laboratory, 1770 N. Research Pkwy, Suite 123, North Logan, UT 84341, USA;2. Department of Geology, 4505 Old Main Hill, Utah State University, Logan, UT 84322-4505, USA;1. Geography & Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, Wales, United Kingdom;2. Archéosciences Bordeaux, UMR 6034, CNRS - Université Bordeaux Montaigne, 33607, Pessac Cedex, France;3. Département des sciences de la Terre et de l''atmosphère, Université du Québec à Montréal, Québec, Canada;1. Department of Geology, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA;2. Department of Plant Biology, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA;3. Department of Atmospheric Sciences, University of Hawaii at Mānoa, Honolulu, HI, 96822, USA;4. Illinois State Geological Survey, University of Illinois Urbana-Champaign, Champaign, IL, 61820, USA |
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| Abstract: | The conterminous United States contains an extensive and generally well-studied record of Last Glacial loess. The loess occurs in diverse physiographic provinces, and under a wide range of climatic and ecological conditions. Both glacial and non-glacial loess sources are present, and many properties of the loess vary systematically with distance from loess sources. United States’ mid-continent Last Glacial loess is probably the thickest in the world, and our calculated mass accumulation rates (MARs) are as high as 17,500 g/m2/yr at the Bignell Hill locality in Nebraska, and many near-source localities have MARs greater than 1500 g/m2/yr. These MARs are high relative to rates calculated in other loess provinces around the world. Recent models of Last Glacial dust sources fail to predict the extent and magnitude of dust flux from the mid-continent of the United States. A better understanding of linkages between climate, ice sheet behaviour, routing of glacial meltwater, land surface processes beyond the ice margin, and vegetation is needed to improve the predictive capabilities of models simulating dust flux from this region. |
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