Steven Hostetler, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 82
Ages, distributions, and origins of upland coastal dune sheets in Oregon, USA Ages, distributions, and origins of upland coastal dune sheets in Oregon, USA
A total of ten upland dune sheets, totaling 245??km in combined length, have been investigated for their origin(s) along the Oregon coast (500??km in length). The ages of dune emplacement range from 0.1 to 103??ka based on radiocarbon (36 samples) and luminescence (46 samples) dating techniques. The majority of the emplacement dates fall into two periods of late-Pleistocene age (11-103...
Authors
C. D. Peterson, E. Stock, D.M. Price, R. Hart, F. Reckendorf, J.M. Erlandson, S. W. Hostetler
Large fluctuations of dissolved oxygen in the Indian and Pacific oceans during Dansgaard-Oeschger oscillations caused by variations of North Atlantic Deep Water subduction Large fluctuations of dissolved oxygen in the Indian and Pacific oceans during Dansgaard-Oeschger oscillations caused by variations of North Atlantic Deep Water subduction
Paleoclimate records from glacial Indian and Pacific oceans sediments document millennial-scale fluctuations of subsurface dissolved oxygen levels and denitrification coherent with North Atlantic temperature oscillations. Yet the mechanism of this teleconnection between the remote ocean basins remains elusive. Here we present model simulations of the oxygen and nitrogen cycles that...
Authors
A. Schmittner, E.D. Galbraith, S. W. Hostetler, Thomas F. Pedersen, R. Zhang
Atlas of climatic controls of wildfire in the western United States Atlas of climatic controls of wildfire in the western United States
Wildfire behavior depends on several factors including ecologic characteristics, near-term and antecedent climatic conditions,fuel availability and moisture level, weather, and sources of ignition (lightning or human). The variability and interplay of these factors over many spatial and temporal scales present an ongoing challenge to our ability to forecast a given wildfire season. Here...
Authors
S. W. Hostetler, P. J. Bartlein, J.O. Holman
Radiolaria and pollen records from 0 to 50 ka at ODP Site 1233: Continental and marine climate records from the Southeast Pacific Radiolaria and pollen records from 0 to 50 ka at ODP Site 1233: Continental and marine climate records from the Southeast Pacific
Site 1233 drilled during Leg 202 of the Ocean Drilling Program provides a detailed record of marine and continental climate change in the Southeast Pacific and South American continent. Splits from over 500 samples taken at 20 cm intervals for quantitative analysis of radiolarian and pollen populations yield a temporal resolution of 200-400 years. In each sample, 39 pollen taxa and 40...
Authors
N. G. Pisias, L. Heusser, C. Heusser, S. W. Hostetler, A.C. Mix, M. Weber
Sensitivity of Last Glacial Maximum climate to uncertainties in tropical and subtropical ocean temperatures Sensitivity of Last Glacial Maximum climate to uncertainties in tropical and subtropical ocean temperatures
The faunal and floral gradients that underlie the CLIMAP (1981) sea-surface temperature (SST) reconstructions for the Last Glacial Maximum (LGM) reflect ocean temperature gradients and frontal positions. The transfer functions used to reconstruct SSTs from biologic gradients are biased, however, because at the warmest sites they display inherently low sensitivity in translating fauna to...
Authors
S. Hostetler, N. Pisias, A. Mix
Modeling paleoclimates Modeling paleoclimates
Paleoclimatic data and climate models play a complimentary role in understanding climate change. This chapter provides an overview of the process of climate-system modeling, presents the taxonomy of the models recently applied in the study of Quaternary climate change and variation, and discusses the development of climate modeling since the 1965 International Union for Quaternary...
Authors
Patrick J Bartlein, Steven W. Hostetler
Science and Products
Filter Total Items: 82
Ages, distributions, and origins of upland coastal dune sheets in Oregon, USA Ages, distributions, and origins of upland coastal dune sheets in Oregon, USA
A total of ten upland dune sheets, totaling 245??km in combined length, have been investigated for their origin(s) along the Oregon coast (500??km in length). The ages of dune emplacement range from 0.1 to 103??ka based on radiocarbon (36 samples) and luminescence (46 samples) dating techniques. The majority of the emplacement dates fall into two periods of late-Pleistocene age (11-103...
Authors
C. D. Peterson, E. Stock, D.M. Price, R. Hart, F. Reckendorf, J.M. Erlandson, S. W. Hostetler
Large fluctuations of dissolved oxygen in the Indian and Pacific oceans during Dansgaard-Oeschger oscillations caused by variations of North Atlantic Deep Water subduction Large fluctuations of dissolved oxygen in the Indian and Pacific oceans during Dansgaard-Oeschger oscillations caused by variations of North Atlantic Deep Water subduction
Paleoclimate records from glacial Indian and Pacific oceans sediments document millennial-scale fluctuations of subsurface dissolved oxygen levels and denitrification coherent with North Atlantic temperature oscillations. Yet the mechanism of this teleconnection between the remote ocean basins remains elusive. Here we present model simulations of the oxygen and nitrogen cycles that...
Authors
A. Schmittner, E.D. Galbraith, S. W. Hostetler, Thomas F. Pedersen, R. Zhang
Atlas of climatic controls of wildfire in the western United States Atlas of climatic controls of wildfire in the western United States
Wildfire behavior depends on several factors including ecologic characteristics, near-term and antecedent climatic conditions,fuel availability and moisture level, weather, and sources of ignition (lightning or human). The variability and interplay of these factors over many spatial and temporal scales present an ongoing challenge to our ability to forecast a given wildfire season. Here...
Authors
S. W. Hostetler, P. J. Bartlein, J.O. Holman
Radiolaria and pollen records from 0 to 50 ka at ODP Site 1233: Continental and marine climate records from the Southeast Pacific Radiolaria and pollen records from 0 to 50 ka at ODP Site 1233: Continental and marine climate records from the Southeast Pacific
Site 1233 drilled during Leg 202 of the Ocean Drilling Program provides a detailed record of marine and continental climate change in the Southeast Pacific and South American continent. Splits from over 500 samples taken at 20 cm intervals for quantitative analysis of radiolarian and pollen populations yield a temporal resolution of 200-400 years. In each sample, 39 pollen taxa and 40...
Authors
N. G. Pisias, L. Heusser, C. Heusser, S. W. Hostetler, A.C. Mix, M. Weber
Sensitivity of Last Glacial Maximum climate to uncertainties in tropical and subtropical ocean temperatures Sensitivity of Last Glacial Maximum climate to uncertainties in tropical and subtropical ocean temperatures
The faunal and floral gradients that underlie the CLIMAP (1981) sea-surface temperature (SST) reconstructions for the Last Glacial Maximum (LGM) reflect ocean temperature gradients and frontal positions. The transfer functions used to reconstruct SSTs from biologic gradients are biased, however, because at the warmest sites they display inherently low sensitivity in translating fauna to...
Authors
S. Hostetler, N. Pisias, A. Mix
Modeling paleoclimates Modeling paleoclimates
Paleoclimatic data and climate models play a complimentary role in understanding climate change. This chapter provides an overview of the process of climate-system modeling, presents the taxonomy of the models recently applied in the study of Quaternary climate change and variation, and discusses the development of climate modeling since the 1965 International Union for Quaternary...
Authors
Patrick J Bartlein, Steven W. Hostetler