James B Swinehart
Dados Biográficos
| ID | 4454358 |
|---|---|
| NOME | James B Swinehart |
| PRENOMES | James B |
| SOBRENOME | Swinehart |
| ASSINATURA | SWINEHART J B |
| AFILIAÇÕES | University of Nebraska–Lincoln |
| VERIFICADO | Não |
| TOTAL DE OBRAS | 9 |
| TOTAL DE CITAÇÕES | 36 |
| TOTAL COMO AUTOR | 9 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1974 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2014 |
| ÍNDICE H | 4 |
Temporal and spatial variability in dune reactivation across the Nebraska Sand Hills, USA
The Nebraska Sand Hills is a stabilized dune field on the Great Plains of North America. Although it is well known that this dune field, like several others on the Great Plains, last experienced widespread activity during the Medieval Climatic Anomaly (MCA, ~AD 900–1300), spatial variation in the timing and nature of drought development is poorly constrained. To elucidate spatial trends in dune reactivation, samples potentially representing MCA a…
Holocene variability in hydrology, vegetation, fire, and eolian activity in the Nebraska Sand Hills, USA
This study combined multiple aquatic and terrestrial proxies, including diatoms, pollen, grain size, and bulk-sediment chemistry to reconstruct the history of three lake sites located in the central Sand Hills of Nebraska, USA. Long-term changes in effective moisture are evident at all sites, with significant changes occurring at ~6000, ~4000, and ~ 2000 cal. yr BP. Both aquatic and terrestrial indicators suggest that effective moisture was low b…
Holocene climatic changes revealed by aeolian deposits from the Qinghai Lake area (northeastern Qinghai-Tibetan Plateau) and possible forcing mechanisms
Previous palaeoclimatic studies in the northeastern Qinghai-Tibetan Plateau (NETP) during the Holocene, mainly using lake sediments, have deepened our understanding of the climatic system in this remote region. The timing and forcing mechanisms of climatic change in this region are still controversial, however. Aeolian sand and silt deposits, which are widely distributed in the NETP, can be readily dated by optically stimulated luminescence (OSL)…
Lacustrine evidence for moisture changes in the Nebraska Sand Hills during Marine Isotope Stage 3
In the central Great Plains of North America, loess stratigraphy suggests that climate during the late Pleistocene was cold and dry. However, this record is discontinuous, and there are few other records of late-Pleistocene conditions. Cobb Basin, located on the northern edge of the Nebraska Sand Hills, contains lacustrine sediments deposited during Marine Isotope Stage 3, beginning approximately 45,000 cal yr BP and continuing for at least 10,00…
Late-Holocene dune activity linked to hydrological drought, Nebraska Sand Hills, USA
Dunefields of the Great Plains contain stratigraphic records of episodic Holocene aeolian activity, potentially providing a valuable record of climatic change. It has been dif” cult to establish unambiguous links between activity at speci” c sites and regional palaeoclimate, however. Here we demonstrate that widespread late-Holocene aeolian activity in the Nebraska Sand Hills, the largest dune” eld on the Great Plains of North America, occurred d…
Geochemical Evidence for an Eolian Sand Dam across the North and South Platte Rivers in Nebraska
Geochemical and geomorphic data from dune fields in southwestern Nebraska provide new evidence that the Nebraska Sand Hills once migrated across the North and South Platte rivers and dammed the largest tributary system to the Missouri River. The Lincoln County and Imperial dune fields, which lie downwind of the South Platte River, have compositions intermediate between the Nebraska Sand Hills (quartz-rich) and northeastern Colorado dunes (K-felds…
Late Holocene Eolian Activity in the Mineralogically Mature Nebraska Sand Hills
The age of sand dunes in the Nebraska Sand Hills has been controversial, with some investigators suggesting a full-glacial age and others suggesting that they were last active in the late Holocene. New accelerator mass spectrometry radiocarbon ages of unaltered bison bones and organic-rich sediments suggest that eolian sand deposition occurred at least twice in the past 3000 14 C yr B.P. in three widely separated localities and as many as three t…
Middle- and late-Holocene dune reactivation in the Nebraska Sand Hills, USA
A combination of optical dating of aeolian sand, and radiocarbon dating of palaeosols and interdune sediments, has allowed some refinements to the chronostratigraphy of the Nebraska Sand Hills. Our results directly confirm previous inferences that multiple phases of aeolian deposition, including megabarchan dune reactivation, occurred within the Sand Hills during the middle and late Holocene. Optical dates on stratified aeolian (barchan dune) sed…
Diffusion of Medical Knowledge
Diffusion of Medical Knowledge James Swinehart, James Swinehart Children's Television Workshop Search for other works by this author on: Oxford Academic Google Scholar Robert Atkyns, Robert Atkyns University of Connecticut Search for other works by this author on: Oxford Academic Google Scholar Rashid Bashur, Rashid Bashur University of Michigan Search for other works by this author on: Oxford Academic Google Scholar Bernard Portis Bernard Portis…
Late-Holocene dune activity linked to hydrological drought, Nebraska Sand Hills, USA
Dunefields of the Great Plains contain stratigraphic records of episodic Holocene aeolian activity, potentially providing a valuable record of climatic change. It has been dif” cult to establish unambiguous links between activity at speci” c sites and regional palaeoclimate, however. Here we demonstrate that widespread late-Holocene aeolian activity in the Nebraska Sand Hills, the largest dune” eld on the Great Plains of North America, occurred d…
Middle- and late-Holocene dune reactivation in the Nebraska Sand Hills, USA
A combination of optical dating of aeolian sand, and radiocarbon dating of palaeosols and interdune sediments, has allowed some refinements to the chronostratigraphy of the Nebraska Sand Hills. Our results directly confirm previous inferences that multiple phases of aeolian deposition, including megabarchan dune reactivation, occurred within the Sand Hills during the middle and late Holocene. Optical dates on stratified aeolian (barchan dune) sed…
Holocene climatic changes revealed by aeolian deposits from the Qinghai Lake area (northeastern Qinghai-Tibetan Plateau) and possible forcing mechanisms
Previous palaeoclimatic studies in the northeastern Qinghai-Tibetan Plateau (NETP) during the Holocene, mainly using lake sediments, have deepened our understanding of the climatic system in this remote region. The timing and forcing mechanisms of climatic change in this region are still controversial, however. Aeolian sand and silt deposits, which are widely distributed in the NETP, can be readily dated by optically stimulated luminescence (OSL)…
Holocene variability in hydrology, vegetation, fire, and eolian activity in the Nebraska Sand Hills, USA
This study combined multiple aquatic and terrestrial proxies, including diatoms, pollen, grain size, and bulk-sediment chemistry to reconstruct the history of three lake sites located in the central Sand Hills of Nebraska, USA. Long-term changes in effective moisture are evident at all sites, with significant changes occurring at ~6000, ~4000, and ~ 2000 cal. yr BP. Both aquatic and terrestrial indicators suggest that effective moisture was low b…
Temporal and spatial variability in dune reactivation across the Nebraska Sand Hills, USA
The Nebraska Sand Hills is a stabilized dune field on the Great Plains of North America. Although it is well known that this dune field, like several others on the Great Plains, last experienced widespread activity during the Medieval Climatic Anomaly (MCA, ~AD 900–1300), spatial variation in the timing and nature of drought development is poorly constrained. To elucidate spatial trends in dune reactivation, samples potentially representing MCA a…
Diffusion of Medical Knowledge
Diffusion of Medical Knowledge James Swinehart, James Swinehart Children's Television Workshop Search for other works by this author on: Oxford Academic Google Scholar Robert Atkyns, Robert Atkyns University of Connecticut Search for other works by this author on: Oxford Academic Google Scholar Rashid Bashur, Rashid Bashur University of Michigan Search for other works by this author on: Oxford Academic Google Scholar Bernard Portis Bernard Portis…
Late Holocene Eolian Activity in the Mineralogically Mature Nebraska Sand Hills
The age of sand dunes in the Nebraska Sand Hills has been controversial, with some investigators suggesting a full-glacial age and others suggesting that they were last active in the late Holocene. New accelerator mass spectrometry radiocarbon ages of unaltered bison bones and organic-rich sediments suggest that eolian sand deposition occurred at least twice in the past 3000 14 C yr B.P. in three widely separated localities and as many as three t…
Middle- and late-Holocene dune reactivation in the Nebraska Sand Hills, USA
A combination of optical dating of aeolian sand, and radiocarbon dating of palaeosols and interdune sediments, has allowed some refinements to the chronostratigraphy of the Nebraska Sand Hills. Our results directly confirm previous inferences that multiple phases of aeolian deposition, including megabarchan dune reactivation, occurred within the Sand Hills during the middle and late Holocene. Optical dates on stratified aeolian (barchan dune) sed…
Geochemical Evidence for an Eolian Sand Dam across the North and South Platte Rivers in Nebraska
Geochemical and geomorphic data from dune fields in southwestern Nebraska provide new evidence that the Nebraska Sand Hills once migrated across the North and South Platte rivers and dammed the largest tributary system to the Missouri River. The Lincoln County and Imperial dune fields, which lie downwind of the South Platte River, have compositions intermediate between the Nebraska Sand Hills (quartz-rich) and northeastern Colorado dunes (K-felds…
Late-Holocene dune activity linked to hydrological drought, Nebraska Sand Hills, USA
Dunefields of the Great Plains contain stratigraphic records of episodic Holocene aeolian activity, potentially providing a valuable record of climatic change. It has been dif” cult to establish unambiguous links between activity at speci” c sites and regional palaeoclimate, however. Here we demonstrate that widespread late-Holocene aeolian activity in the Nebraska Sand Hills, the largest dune” eld on the Great Plains of North America, occurred d…
Lacustrine evidence for moisture changes in the Nebraska Sand Hills during Marine Isotope Stage 3
In the central Great Plains of North America, loess stratigraphy suggests that climate during the late Pleistocene was cold and dry. However, this record is discontinuous, and there are few other records of late-Pleistocene conditions. Cobb Basin, located on the northern edge of the Nebraska Sand Hills, contains lacustrine sediments deposited during Marine Isotope Stage 3, beginning approximately 45,000 cal yr BP and continuing for at least 10,00…
Holocene climatic changes revealed by aeolian deposits from the Qinghai Lake area (northeastern Qinghai-Tibetan Plateau) and possible forcing mechanisms
Previous palaeoclimatic studies in the northeastern Qinghai-Tibetan Plateau (NETP) during the Holocene, mainly using lake sediments, have deepened our understanding of the climatic system in this remote region. The timing and forcing mechanisms of climatic change in this region are still controversial, however. Aeolian sand and silt deposits, which are widely distributed in the NETP, can be readily dated by optically stimulated luminescence (OSL)…
Holocene variability in hydrology, vegetation, fire, and eolian activity in the Nebraska Sand Hills, USA
This study combined multiple aquatic and terrestrial proxies, including diatoms, pollen, grain size, and bulk-sediment chemistry to reconstruct the history of three lake sites located in the central Sand Hills of Nebraska, USA. Long-term changes in effective moisture are evident at all sites, with significant changes occurring at ~6000, ~4000, and ~ 2000 cal. yr BP. Both aquatic and terrestrial indicators suggest that effective moisture was low b…
Temporal and spatial variability in dune reactivation across the Nebraska Sand Hills, USA
The Nebraska Sand Hills is a stabilized dune field on the Great Plains of North America. Although it is well known that this dune field, like several others on the Great Plains, last experienced widespread activity during the Medieval Climatic Anomaly (MCA, ~AD 900–1300), spatial variation in the timing and nature of drought development is poorly constrained. To elucidate spatial trends in dune reactivation, samples potentially representing MCA a…
Geology and Paleoclimatology Research (8 obras) · Aeolian processes (7 obras) · Aeolian processes and effects (7 obras) · Geomorphology (7 obras) · Geography (6 obras) · Holocene (6 obras) · Physical geography (6 obras) · Geology (5 obras) · Arid (3 obras) · Geological formations and processes (3 obras)