Ground-water processes controlling a prairie lake's response to middle Holocene drought

Alison J. Smith, Joseph J. Donovan, Emi Ito, Daniel R. Engstrom

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

Lake response to climate forcing is commonly regarded as being controlled by within-lake processes. We present a case from the northern Great Plains in which Holocene drought response recorded in lake sediments was determined by changes in chemical characteristics of source ground water. Middle Holocene ostracode assemblages were dominated by halophylic Limnocythere stapling indicating increased lake-water salinity, yet the oxygen isotope values in this period decreased by 2‰ to 3‰, contrary to expectations of evaporative dominance. We infer from these proxy records and ground-water flow-model results that the paleoclimatic record in the lake was mediated by changes in ground-water catchment area and by reduction in evapo-transpiration accompanying desiccation of peripheral lake basins.

Original languageEnglish (US)
Pages (from-to)391-394
Number of pages4
JournalGeology
Volume25
Issue number5
DOIs
StatePublished - Jan 1 1997

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