Steven Hostetler, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 82
Interhemispheric ice-sheet synchronicity during the last glacial maximum
The timing of the last maximum extent of the Antarctic ice sheets relative to those in the Northern Hemisphere remains poorly understood. We develop a chronology for the Weddell Sea sector of the East Antarctic Ice Sheet that, combined with ages from other Antarctic ice-sheet sectors, indicates that the advance to and retreat from their maximum extent was within dating uncertainties synchronous wi
Authors
Michael E. Weber, Peter U. Clark, Werner Ricken, Jerry X. Mitrovica, Steven W. Hostetler, Gerhard Kuhn
Interhemispheric ice-sheet synchronicity during the last glacial maximum
The timing of the last maximum extent of the Antarctic ice sheets relative to those in the Northern Hemisphere remains poorly understood. We develop a chronology for the Weddell Sea sector of the East Antarctic Ice Sheet that, combined with ages from other Antarctic ice-sheet sectors, indicates that the advance to and retreat from their maximum extent was within dating uncertainties synchronous wi
Authors
M.E. Weber, P.U. Clark, W. Ricken, J.X. Mitrovica, S. W. Hostetler, G. Kuhn
The potential influence of changing climate on the persistence of salmonids of the inland west
The Earth's climate warmed steadily during the 20th century, and mean annual air temperatures are estimated to have increased by 0.6°C (Intergovernmental Panel on Climate Change, 2007). Although many cycles of warming and cooling have occurred in the past, the most recent warming period is unique in its rate and magnitude of change (Siegenthaler and others, 2005) and in its association with anthro
Authors
A.L. Haak, J.E. Williams, D. Isaak, A. Todd, C.C. Muhlfeld, J. L. Kershner, R. E. Gresswell, S. W. Hostetler, H.M. Neville
Geochronology and paleoclimatic implications of the last deglaciation of the Mauna Kea Ice Cap, Hawaii
We present new 3He surface exposure ages on moraines and bedrock near the summit of Mauna Kea, Hawaii, which refine the age of the Mauna Kea Ice Cap during the Local Last Glacial Maximum (LLGM) and identify a subsequent fluctuation of the ice margin. The 3He ages, when combined with those reported previously, indicate that the local ice-cap margin began to retreat from its LLGM extent at 20.5??2.5
Authors
Faron S. Anslow, P.U. Clark, M.D. Kurz, S. W. Hostetler
Holocene coastal dune fields used as indicators of net littoral transport: West Coast, USA
Between Point Grenville, Washington, and Point Conception, California (1500 km distance) 21 dune fields record longshore transport in 20 littoral cells during the late Holocene. The direction of predominant littoral transport is established by relative positions of dune fields (north, central, or south) in 17 representative littoral cells. Dune field position is north of cell midpoints in northern
Authors
C. D. Peterson, E. Stock, R. Hart, D. Percy, S. W. Hostetler, J.R. Knott
Use of models and observations to assess trends in the 1950–2005 water balance and climate of Upper Klamath Lake, Oregon
A 1‐dimensional surface energy balance model is applied to produce continuous simulations of daily lake evaporation of Upper Klamath Lake, Oregon (UKL) for the period 1950–2005. The model is implemented using observed data from land‐based sites and rafts collected during 2005–2006. Progressively longer, temporally overlapping simulations are produced using observed forcing data sets from sites nea
Authors
Steven W. Hostetler
Comment: Radiocarbon deglaciation chronology of the Thunder Bay, Ontario area and implications for ice sheet retreat patterns
No abstract available.
Authors
Anders E. Carlson, Peter U. Clark, Steven W. Hostetler
Environmental influences on speleothem growth in southwestern Oregon during the last 380, 000 years
The growth of carbonate formations in caves (speleothems) is sensitive to changes in environmental conditions at the surface (temperature, precipitation and vegetation) and can provide useful paleoclimatic and paleoenvironmental information. We use 73 230Th dates from speleothems collected from a cave in southwestern Oregon (USA) to constrain speleothem growth for the past 380 000 years. Most spel
Authors
Vasile Ersek, Steven W. Hostetler, Hai Cheng, Peter U. Clark, Faron S. Anslow, Alan C. Mix, R. Lawrence Edwards
The last glacial maximum
We used 5704 14C, 10Be, and 3He ages that span the interval from 10,000 to 50,000 years ago (10 to 50 ka) to constrain the timing of the Last Glacial Maximum (LGM) in terms of global ice-sheet and mountain-glacier extent. Growth of the ice sheets to their maximum positions occurred between 33.0 and 26.5 ka in response to climate forcing from decreases in northern summer insolation, tropical Pacifi
Authors
P.U. Clark, A. S. Dyke, J.D. Shakun, A.E. Carlson, J. Clark, B. Wohlfarth, J.X. Mitrovica, S. W. Hostetler, A.M. McCabe
Temporal and spatial structure in a daily wildfire-start data set from the western United States (198696)
The temporal and spatial structure of 332 404 daily fire-start records from the western United States for the period 1986 through 1996 is illustrated using several complimentary visualisation techniques. We supplement maps and time series plots with Hovmo??ller diagrams that reduce the spatial dimensionality of the daily data in order to reveal the underlying space?time structure. The mapped distr
Authors
P. J. Bartlein, S. W. Hostetler, S.L. Shafer, J.O. Holman, A.M. Solomon
Distributed energy balance modeling of South Cascade Glacier, Washington and assessment of model uncertainty
We have developed a physically based, distributed surface energy balance model to simulate glacier mass balance under meteorological and climatological forcing. Here we apply the model to estimate summer ablation on South Cascade Glacier, Washington, for the 2004 and 2005 mass balance seasons. To arrive at optimal mass balance simulations, we investigate and quantify model uncertainty associated w
Authors
Faron S. Anslow, S. Hostetler, W.R. Bidlake, P.U. Clark
Mechanisms for an ∼7‐kyr climate and sea‐level oscillation during marine isotope stage 3
No abstract available.
Authors
Peter U. Clark, Steven W. Hostetler, N. G. Pisias, Andreas Schmittner, K. J. Meissner
Science and Products
Filter Total Items: 82
Interhemispheric ice-sheet synchronicity during the last glacial maximum
The timing of the last maximum extent of the Antarctic ice sheets relative to those in the Northern Hemisphere remains poorly understood. We develop a chronology for the Weddell Sea sector of the East Antarctic Ice Sheet that, combined with ages from other Antarctic ice-sheet sectors, indicates that the advance to and retreat from their maximum extent was within dating uncertainties synchronous wi
Authors
Michael E. Weber, Peter U. Clark, Werner Ricken, Jerry X. Mitrovica, Steven W. Hostetler, Gerhard Kuhn
Interhemispheric ice-sheet synchronicity during the last glacial maximum
The timing of the last maximum extent of the Antarctic ice sheets relative to those in the Northern Hemisphere remains poorly understood. We develop a chronology for the Weddell Sea sector of the East Antarctic Ice Sheet that, combined with ages from other Antarctic ice-sheet sectors, indicates that the advance to and retreat from their maximum extent was within dating uncertainties synchronous wi
Authors
M.E. Weber, P.U. Clark, W. Ricken, J.X. Mitrovica, S. W. Hostetler, G. Kuhn
The potential influence of changing climate on the persistence of salmonids of the inland west
The Earth's climate warmed steadily during the 20th century, and mean annual air temperatures are estimated to have increased by 0.6°C (Intergovernmental Panel on Climate Change, 2007). Although many cycles of warming and cooling have occurred in the past, the most recent warming period is unique in its rate and magnitude of change (Siegenthaler and others, 2005) and in its association with anthro
Authors
A.L. Haak, J.E. Williams, D. Isaak, A. Todd, C.C. Muhlfeld, J. L. Kershner, R. E. Gresswell, S. W. Hostetler, H.M. Neville
Geochronology and paleoclimatic implications of the last deglaciation of the Mauna Kea Ice Cap, Hawaii
We present new 3He surface exposure ages on moraines and bedrock near the summit of Mauna Kea, Hawaii, which refine the age of the Mauna Kea Ice Cap during the Local Last Glacial Maximum (LLGM) and identify a subsequent fluctuation of the ice margin. The 3He ages, when combined with those reported previously, indicate that the local ice-cap margin began to retreat from its LLGM extent at 20.5??2.5
Authors
Faron S. Anslow, P.U. Clark, M.D. Kurz, S. W. Hostetler
Holocene coastal dune fields used as indicators of net littoral transport: West Coast, USA
Between Point Grenville, Washington, and Point Conception, California (1500 km distance) 21 dune fields record longshore transport in 20 littoral cells during the late Holocene. The direction of predominant littoral transport is established by relative positions of dune fields (north, central, or south) in 17 representative littoral cells. Dune field position is north of cell midpoints in northern
Authors
C. D. Peterson, E. Stock, R. Hart, D. Percy, S. W. Hostetler, J.R. Knott
Use of models and observations to assess trends in the 1950–2005 water balance and climate of Upper Klamath Lake, Oregon
A 1‐dimensional surface energy balance model is applied to produce continuous simulations of daily lake evaporation of Upper Klamath Lake, Oregon (UKL) for the period 1950–2005. The model is implemented using observed data from land‐based sites and rafts collected during 2005–2006. Progressively longer, temporally overlapping simulations are produced using observed forcing data sets from sites nea
Authors
Steven W. Hostetler
Comment: Radiocarbon deglaciation chronology of the Thunder Bay, Ontario area and implications for ice sheet retreat patterns
No abstract available.
Authors
Anders E. Carlson, Peter U. Clark, Steven W. Hostetler
Environmental influences on speleothem growth in southwestern Oregon during the last 380, 000 years
The growth of carbonate formations in caves (speleothems) is sensitive to changes in environmental conditions at the surface (temperature, precipitation and vegetation) and can provide useful paleoclimatic and paleoenvironmental information. We use 73 230Th dates from speleothems collected from a cave in southwestern Oregon (USA) to constrain speleothem growth for the past 380 000 years. Most spel
Authors
Vasile Ersek, Steven W. Hostetler, Hai Cheng, Peter U. Clark, Faron S. Anslow, Alan C. Mix, R. Lawrence Edwards
The last glacial maximum
We used 5704 14C, 10Be, and 3He ages that span the interval from 10,000 to 50,000 years ago (10 to 50 ka) to constrain the timing of the Last Glacial Maximum (LGM) in terms of global ice-sheet and mountain-glacier extent. Growth of the ice sheets to their maximum positions occurred between 33.0 and 26.5 ka in response to climate forcing from decreases in northern summer insolation, tropical Pacifi
Authors
P.U. Clark, A. S. Dyke, J.D. Shakun, A.E. Carlson, J. Clark, B. Wohlfarth, J.X. Mitrovica, S. W. Hostetler, A.M. McCabe
Temporal and spatial structure in a daily wildfire-start data set from the western United States (198696)
The temporal and spatial structure of 332 404 daily fire-start records from the western United States for the period 1986 through 1996 is illustrated using several complimentary visualisation techniques. We supplement maps and time series plots with Hovmo??ller diagrams that reduce the spatial dimensionality of the daily data in order to reveal the underlying space?time structure. The mapped distr
Authors
P. J. Bartlein, S. W. Hostetler, S.L. Shafer, J.O. Holman, A.M. Solomon
Distributed energy balance modeling of South Cascade Glacier, Washington and assessment of model uncertainty
We have developed a physically based, distributed surface energy balance model to simulate glacier mass balance under meteorological and climatological forcing. Here we apply the model to estimate summer ablation on South Cascade Glacier, Washington, for the 2004 and 2005 mass balance seasons. To arrive at optimal mass balance simulations, we investigate and quantify model uncertainty associated w
Authors
Faron S. Anslow, S. Hostetler, W.R. Bidlake, P.U. Clark
Mechanisms for an ∼7‐kyr climate and sea‐level oscillation during marine isotope stage 3
No abstract available.
Authors
Peter U. Clark, Steven W. Hostetler, N. G. Pisias, Andreas Schmittner, K. J. Meissner