Frank Urban
Frank Urban is a Geologist with the Geosciences and Environmental Change Science Center.
Science and Products
Filter Total Items: 20
Thermal erosion of a permafrost coastline: Improving process-based models using time-lapse photography
Coastal erosion rates locally exceeding 30 m y-1 have been documented along Alaska's Beaufort Sea coastline, and a number of studies suggest that these erosion rates have accelerated as a result of climate change. However, a lack of direct observational evidence has limited our progress in quantifying the specific processes that connect climate change to coastal erosion rates in the Arctic. In par
Authors
C. Wobus, R. Anderson, I. Overeem, N. Matell, G. Clow, F. Urban
Sea ice loss enhances wave action at the Arctic coast
Erosion rates of permafrost coasts along the Beaufort Sea accelerated over the past 50 years synchronously with Arctic‐wide declines in sea ice extent, suggesting a causal relationship between the two. A fetch‐limited wave model driven by sea ice position and local wind data from northern Alaska indicates that the exposure of permafrost bluffs to seawater increased by a factor of 2.5 during 1979–2
Authors
I. Overeem, R. Scott Anderson, C.W. Wobus, Gary D. Clow, Frank E. Urban, N. Matell
Two mechanisms of aquatic and terrestrial habitat change along an Alaskan Arctic coastline
Arctic habitats at the interface between land and sea are particularly vulnerable to climate change. The northern Teshekpuk Lake Special Area (N-TLSA), a coastal plain ecosystem along the Beaufort Sea in northern Alaska, provides habitat for migratory waterbirds, caribou, and potentially, denning polar bears. The 60-km coastline of N-TLSA is experiencing increasing rates of coastline erosion and s
Authors
Christopher D. Arp, Benjamin M. Jones, Joel A. Schmutz, Frank E. Urban, M. Torre Jorgenson
Lake temperature and ice cover regimes in the Alaskan Subarctic and Arctic: Integrated monitoring, remote sensing, and modeling
Lake surface regimes are fundamental attributes of lake ecosystems and their interaction with the land and atmosphere. High latitudes may be particularly sensitive to climate change, however, adequate baselines for these lakes are often lacking. In this study, we couple monitoring, remote sensing, and modeling techniques to generate baseline datasets of lake surface temperature and ice cover in th
Authors
C.D. Arp, Benjamin M. Jones, Matthew Whitman, A. Larsen, F.E. Urban
The dynamic interaction of climate, vegetation, and dust emission, Mojave Desert, USA
No abstract available.
Authors
Frank Urban, Richard L. Reynolds, R. Fulton
Sediment losses and gains across a gradient of livestock grazing and plant invasion in a cool, semi-arid grassland, Colorado Plateau, USA
Large sediment fluxes can have significant impacts on ecosystems. We measured incoming and outgoing sediment across a gradient of soil disturbance (livestock grazing, plowing) and annual plant invasion for 9 years. Our sites included two currently ungrazed sites: one never grazed by livestock and dominated by perennial grasses/well-developed biocrusts and one not grazed since 1974 and dominated by
Authors
Jayne Belnap, Richard L. Reynolds, Marith C. Reheis, Susan L. Phillips, Frank Urban, Harland L. Goldstein
Fire behavior, weather, and burn severity of the 2007 anaktuvuk river tundra fire, North Slope, Alaska
In 2007, the Anaktuvuk River Fire (ARF) became the largest recorded tundra fire on the North Slope of Alaska. The ARF burned for nearly three months, consuming more than 100,000 ha. At its peak in early September, the ARF burned at a rate of 7000 ha d-1. The conditions potentially responsible for this large tundra fire include modeled record high summer temperature and record low summer precipitat
Authors
Benjamin M. Jones, Crystal A. Kolden, Randi Jandt, John T. Abatzoglou, Frank Urban, Christopher D. Arp
Erosional history of Cape Halkett and contemporary monitoring of bluff retreat, Beaufort Sea coast, Alaska
Cape Halkett is located along the Beaufort Sea at the end of a low-lying tundra landscape. The area has been subject to major modifications over the last century as a result of erosion and migration of the coastline inland. Long-term mean annual erosion rates (1955-2009) for the entire cape are 7.6 m/yr, with a gradual increase in rates over the first five time periods of remotely sensed imagery a
Authors
Benjamin M. Jones, Christopher D. Arp, Richard A. Beck, Guido Grosse, James M. Webster, Frank E. Urban
Science and Products
Filter Total Items: 20
Thermal erosion of a permafrost coastline: Improving process-based models using time-lapse photography
Coastal erosion rates locally exceeding 30 m y-1 have been documented along Alaska's Beaufort Sea coastline, and a number of studies suggest that these erosion rates have accelerated as a result of climate change. However, a lack of direct observational evidence has limited our progress in quantifying the specific processes that connect climate change to coastal erosion rates in the Arctic. In par
Authors
C. Wobus, R. Anderson, I. Overeem, N. Matell, G. Clow, F. Urban
Sea ice loss enhances wave action at the Arctic coast
Erosion rates of permafrost coasts along the Beaufort Sea accelerated over the past 50 years synchronously with Arctic‐wide declines in sea ice extent, suggesting a causal relationship between the two. A fetch‐limited wave model driven by sea ice position and local wind data from northern Alaska indicates that the exposure of permafrost bluffs to seawater increased by a factor of 2.5 during 1979–2
Authors
I. Overeem, R. Scott Anderson, C.W. Wobus, Gary D. Clow, Frank E. Urban, N. Matell
Two mechanisms of aquatic and terrestrial habitat change along an Alaskan Arctic coastline
Arctic habitats at the interface between land and sea are particularly vulnerable to climate change. The northern Teshekpuk Lake Special Area (N-TLSA), a coastal plain ecosystem along the Beaufort Sea in northern Alaska, provides habitat for migratory waterbirds, caribou, and potentially, denning polar bears. The 60-km coastline of N-TLSA is experiencing increasing rates of coastline erosion and s
Authors
Christopher D. Arp, Benjamin M. Jones, Joel A. Schmutz, Frank E. Urban, M. Torre Jorgenson
Lake temperature and ice cover regimes in the Alaskan Subarctic and Arctic: Integrated monitoring, remote sensing, and modeling
Lake surface regimes are fundamental attributes of lake ecosystems and their interaction with the land and atmosphere. High latitudes may be particularly sensitive to climate change, however, adequate baselines for these lakes are often lacking. In this study, we couple monitoring, remote sensing, and modeling techniques to generate baseline datasets of lake surface temperature and ice cover in th
Authors
C.D. Arp, Benjamin M. Jones, Matthew Whitman, A. Larsen, F.E. Urban
The dynamic interaction of climate, vegetation, and dust emission, Mojave Desert, USA
No abstract available.
Authors
Frank Urban, Richard L. Reynolds, R. Fulton
Sediment losses and gains across a gradient of livestock grazing and plant invasion in a cool, semi-arid grassland, Colorado Plateau, USA
Large sediment fluxes can have significant impacts on ecosystems. We measured incoming and outgoing sediment across a gradient of soil disturbance (livestock grazing, plowing) and annual plant invasion for 9 years. Our sites included two currently ungrazed sites: one never grazed by livestock and dominated by perennial grasses/well-developed biocrusts and one not grazed since 1974 and dominated by
Authors
Jayne Belnap, Richard L. Reynolds, Marith C. Reheis, Susan L. Phillips, Frank Urban, Harland L. Goldstein
Fire behavior, weather, and burn severity of the 2007 anaktuvuk river tundra fire, North Slope, Alaska
In 2007, the Anaktuvuk River Fire (ARF) became the largest recorded tundra fire on the North Slope of Alaska. The ARF burned for nearly three months, consuming more than 100,000 ha. At its peak in early September, the ARF burned at a rate of 7000 ha d-1. The conditions potentially responsible for this large tundra fire include modeled record high summer temperature and record low summer precipitat
Authors
Benjamin M. Jones, Crystal A. Kolden, Randi Jandt, John T. Abatzoglou, Frank Urban, Christopher D. Arp
Erosional history of Cape Halkett and contemporary monitoring of bluff retreat, Beaufort Sea coast, Alaska
Cape Halkett is located along the Beaufort Sea at the end of a low-lying tundra landscape. The area has been subject to major modifications over the last century as a result of erosion and migration of the coastline inland. Long-term mean annual erosion rates (1955-2009) for the entire cape are 7.6 m/yr, with a gradual increase in rates over the first five time periods of remotely sensed imagery a
Authors
Benjamin M. Jones, Christopher D. Arp, Richard A. Beck, Guido Grosse, James M. Webster, Frank E. Urban