Aaron R. Young
University of Nebraska–Lincoln
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Geology | 2012
Walter L. Loope; H M Loope; Ronald J. Goble; Timothy G. Fisher; David E. Lytle; Robert J Legg; Douglas A. Wysocki; Paul R. Hanson; Aaron R. Young
Current models of landscape response to Holocene climate change in midcontinent North America largely reconcile Earth orbital and atmospheric climate forcing with pollen-based forest histories on the east and eolian chronologies in Great Plains grasslands on the west. However, thousands of sand dunes spread across 12,000 km 2 in eastern upper Michigan (EUM), more than 500 km east of the present forest-prairie ecotone, present a challenge to such models. We use 65 optically stimulated luminescence (OSL) ages on quartz sand deposited in silt caps (n = 8) and dunes (n = 57) to document eolian activity in EUM. Dune building was widespread ca. 10–8 ka, indicating a sharp, sustained decline in forest cover during that period. This decline was roughly coincident with hydrologic closure of the upper Great Lakes, but temporally inconsistent with most pollen-based models that imply canopy closure throughout the Holocene. Early Holocene forest openings are rarely recognized in pollen sums from EUM because faint signatures of non-arboreal pollen are largely obscured by abundant and highly mobile pine pollen. Early Holocene spikes in nonarboreal pollen are recorded in cores from small ponds, but suggest only a modest extent of forest openings. OSL dating of dune emplacement provides a direct, spatially explicit archive of greatly diminished forest cover during a very dry climate in eastern midcontinent North America ca. 10–8 ka.
Aeolian Research | 2010
Paul R. Hanson; Alan F. Arbogast; William C. Johnson; R.M. Joeckel; Aaron R. Young
Geomorphology | 2008
J.E. Rawling; Paul R. Hanson; Aaron R. Young; John W. Attig
Geomorphology | 2009
Paul R. Hanson; R.M. Joeckel; Aaron R. Young; John D. Horn
Journal of Hydrology | 2016
Tiejun Wang; Trenton E. Franz; Weifeng Yue; Jozsef Szilagyi; Vitaly A. Zlotnik; Jinsheng You; Xunhong Chen; Martha Shulski; Aaron R. Young
Quaternary Science Reviews | 2010
Xiaodong Miao; Paul R. Hanson; Hong Wang; Aaron R. Young
Aeolian Research | 2012
Alan F. Halfen; William C. Johnson; Paul R. Hanson; Terri L. Woodburn; Aaron R. Young; Gregory A. Ludvigson
Quaternary International | 2015
Paul R. Hanson; Joseph A. Mason; Peter M. Jacobs; Aaron R. Young
Geomorphology | 2011
John W. Attig; Paul R. Hanson; J.E. Rawling; Aaron R. Young; Eric C. Carson
Latin American journal of sedimentology and basin analysis | 2010
Adriana Blasi; Carola Castiñeira Latorre; Laura del Puerto; Aldo R. Prieto; Enrique Fucks; Claudio G. De Francesco; Paul R. Hanson; Felipe García-Rodríguez; R. Huarte; J. Carbonari; Aaron R. Young