A regional-scale climate reconstruction of the last 4000 years from lakes in the Nebraska Sand Hills, USA

J. Schmieder, S. C. Fritz, J. B. Swinehart, A. L.C. Shinneman, A. P. Wolfe, G. Miller, N. Daniels, K. C. Jacobs, E. C. Grimm

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27 Scopus citations

Abstract

High-resolution paleohydrological reconstructions were carried out in five shallow lakes in the Nebraska Sand Hills across an east-west transect in order to 1) determine whether long-term droughts of the past 4000 years were spatially and temporally coherent across the region, 2) distinguish local variation in climate or hydrology from regional patterns of change, and 3) compare the paleolimnological results with the existing dune-inferred drought records. Diatom-inferred lake-level was reconstructed for all sites and compared with other regional records. Alterations between high and low lake-levels were frequent during the past 4000 years, which suggests that shifts between dry and wet periods were prevalent across the Sand Hills. Extended multi-decadal to centennial-scale droughts were more common prior to 2000 years BP, while the last two millennia were hydrologically more variable and climate conditions alternated on shorter timescales. Despite some discrepancies among the five records, the paleohydrological reconstructions refine the Holocene drought history of the Nebraska Sand Hills, particularly between ~2200 and 4000 cal a BP. Many of the observed drought events are contemporaneous with severe droughts documented at sites in the northern Great Plains and Rocky Mountains, lending support for the severity and regional significance of these events in western North America.

Original languageEnglish (US)
Pages (from-to)1797-1812
Number of pages16
JournalQuaternary Science Reviews
Volume30
Issue number13-14
DOIs
StatePublished - Jun 2011

Bibliographical note

Funding Information:
This work was funded by the Sand Hills Biocomplexity Project at the University of Nebraska-Lincoln ( NSF-02-167 ), by NSF grant ( EAR06-02154 ) to S. Fritz and E. Grimm, and an NSF grant ( EAR06-09982 ) to V. Zlotnik, S. Fritz, and J. Swinehart. Additional funding was provided through the Department of Geosciences of the University of Nebraska , the Yatkola-Edwards Grant of the Nebraska Geological Society , and the Great Plains Studies Research Grant-in-Aid . G.H. Miller, A.P. Wolfe, and N. Daniels acknowledge financial support from NASA grant NAG5-6051 .

Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.

Keywords

  • Diatoms
  • Droughts
  • Great plains
  • Holocene
  • Lakes
  • Nebraska sand hills
  • Paleolimnology

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