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Geography & Atmospheric Science Scholarly Works: Recent submissions
Now showing items 101-120 of 202
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Fracture propagation as means of rapidly transferring surface meltwater to the base of glaciers
(American Geophysical Union, 2007-01-07)1] Propagation of water-filled crevasses through glaciers is investigated based on the linear elastic fracture mechanics approach. A crevasse will penetrate to the depth where the stress intensity factor at the crevasse ... -
Modeling dynamic controls on ice streams: a Bayesian statistical approach
(International Glaciological Society, 2008-12-05)Our main goal is to exemplify the study of ice-stream dynamics via Bayesian statistical analysis incorporating physical, though imperfectly known, models using data that are both incomplete and noisy. The physical–statistical ... -
Intermittent thinning of Jakobshavn Isbræ, West Greenland, since the Little Ice Age
(International Glaciological Society, 2008-05-05)Rapid thinning and velocity increase on major Greenland outlet glaciers during the last two decades may indicate that these glaciers became unstable as a consequence of the Jakobshavn effect (Hughes, 1986), with terminus ... -
Surface roughness over the northern half of the Greenland Ice Sheet from airborne laser altimetry
(American Geophysical Union, 2009-06-05)Surface roughness, defined as the standard deviation of small-scale elevation fluctuations from the linear trend over 0.5 km, can be estimated from high-resolution airborne laser altimetry. Here we present results for the ... -
Basal melt rates beneath Whillans Ice Stream, West Antarctica
(International Glaciological Society, 2010-08-05)Basal water lubricates and enables the fast flow of the West Antarctic ice streams which exist under low gravitational driving stress. Identification of sources and rates of basal meltwater production can provide insight ... -
A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics
(International Glaciological Society, 2010-11-05)We present results from numerical ice-flow models that include calving criteria based on penetration of surface and basal crevasses, which in turn is a function of longitudinal strain rates near the glacier front. The ... -
Controls on the recent speed-up of Jakobshavn Isbrae, West Greenland
(International Glaciological Society, 2011-02-05)Jakobshavn Isbrae, West Greenland, underwent a large, rapid and not well understood change in flow dynamics in 1998, leading to a doubling of its ice discharge rates. We calculate the width-averaged forces controlling flow ... -
The response of Petermann Glacier to large calving events and its future stability in the context of atmospheric and oceanic warming
(International Glaciological Society, 2012-11-05)This study assesses the impact of a large 2010 calving event on the current and future stability of Petermann Glacier, Greenland, and ascertains the glacier’s interaction with different components of the climate and ocean ... -
How can we use MODIS land surface temperature to validate long-term urban model simulations?
(American Geophysical Union, 2014-03-27)High spatial resolution urban climate modeling is essential for understanding urban climatology and predicting the human health impacts under climate change. Satellite thermal remote-sensing data are potential observational ... -
Evaluating the impact of urban morphology configurations on the accuracy of urban canopy model temperature simulations with MODIS
(American Geophysical Union, 2014-06-09)Simulations of the urban environment contribute to assessments of current and future urban vulnerabilities to extreme heat events. The accuracy of simulations of the urban canopy can be degraded by inaccurate or oversimplified ... -
Multiscale Interactions between Water and Carbon Fluxes and Environmental Variables in A Central U.S. Grassland
(MDPI, 2013-04-10)The temporal interactions between water and carbon cycling and the controlling environmental variables are investigated using wavelets and information theory. We used 3.5 years of eddy covariance station observations from ... -
The Effects of Great Plains Irrigation on the Surface Energy Balance, Regional Circulation, and Precipitation
(American Geophysical Union, 2014-05-05)Irrigation provides a needed source of water in regions of low precipitation. Adding water to a region that would otherwise see little natural precipitation alters the partitioning of surface energy fluxes, the evolution ... -
Restructuring and the Nonmetropolitan Turnaround: The California Evidence
(University of Hawaii Press, 1986-01-01)Conceptions of nonmetropolitan growth have rarely benefited from current debates in social theory. An analytical interpretation of the literature on the "turnaround" is offered from a structuralist perspective. In this ... -
On the Forecasting of Orogenic Mesoscale Convective Complexes
(American Meteorological Society, 1999-12-01)Evidence is presented to support the hypothesis that mesoscale convective complexes (MCCs) near the Rocky Mountains are more likely to form when the middle-tropospheric relative humidity is greater than average and the ... -
The Generation of a Mesoscale Convective System from Mountain Convection
(American Meteorological Society, 1999-06-01)A mesoscale convective system (MCS) that formed just to the east of Denver is investigated with a nonhydrostatic numerical model to determine which processes were important in its initiation. The MCS developed from outflow ... -
Flow over Heated Terrain. Part I: Linear Theory and Idealized Numerical Simulations
(American Meteorological Society, 2005-09-01)The flow past heated topography is examined with both linear and nonlinear models. It is first shown that the forcing of an obstacle with horizontally homogenous surface heating can be approximated by the forcing of an ... -
Flow over Heated Terrain. Part II: Generation of Convective Precipitation
(American Meteorological Society, 2005-09-01)Previous studies have shown that thunderstorms in the Rocky Mountain region have preferred areas in which to form. There has been some indication that these areas depend on the midtropospheric wind direction. A nonhydrostatic ... -
Diurnal Precipitation Variations in South-Central New Mexico
(American Meteorological Society, 1993-07-01)Orographic forcing of diurnal precipitation variations in south-central New Mexico is examined. Harmonic analysis reveals a strong diurnal cycle in precipitation frequency at all stations studied. In addition, relatively ... -
The Summer Plateau Low Pressure System of Mexico
(American Meteorological Society, 1999-04-01)Average July heights and winds over a 10-yr period are computed at 850 mb over Mexico using both surface and radiosonde data. During the day central Mexico at this level is dominated by low pressure, with some smaller areas ... -
Comments on “Rainfall and Climate Variation over a Sloping New Mexico Plateau during the North American Monsoon”
(American Meteorological Society, 1998-02-01)No abstract is available for this item.