Search

Your search keyword '"Daniel R. Engstrom"' showing total 5 results
Start Over Author "Daniel R. Engstrom" Publisher geological society of america
5 results on '"Daniel R. Engstrom"'

3. THE ROLE OF SEDIMENT IN DRIVING PHOSPHORUS LOADING AND DYNAMICS IN THE HIGHLY ALTERED AGRICULTURAL LE SUEUR RIVER BASIN

Author

Diana L. Karwan, Tessa Belo, Megumi Muramoto-Mathieu, Anna Baker, Daniel R. Engstrom, Karen B. Gran, Jacques C. Finlay, and Walter S.C. Atkins

Subjects
Hydrology, geography, geography.geographical_feature_category, chemistry, Agriculture, business.industry, Phosphorus, Drainage basin, chemistry.chemical_element, Environmental science, Sediment, business
Published
2018
Full Text
View/download PDF

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

Author

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

Subjects
Hydrology, biology, Limnocythere, Geology, Radiative forcing, biology.organism_classification, Isotopes of oxygen, Salinity, Evapotranspiration, Prairie lake, Dominance (ecology), Physical geography, Holocene
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 staplini , 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 evapotranspiration accompanying desiccation of peripheral lake basins.

Published
1997
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results