ATTENTION: The software behind KU ScholarWorks is being upgraded to a new version. Starting July 15th, users will not be able to log in to the system, add items, nor make any changes until the new version is in place at the end of July. Searching for articles and opening files will continue to work while the system is being updated. If you have any questions, please contact Marianne Reed at mreed@ku.edu .

Geography & Atmospheric Science Scholarly Works: Recent submissions

Now showing items 81-100 of 202

    • Force Budget: II. Application to Two-Dimensional Flow Along Byrd Station Strain Network, Antarctica 

      van der Veen, Cornelis J.; Whillans, I. M. (International Glaciological Society, 1989-11-05)
      Resistive stresses and velocities at depth are calculated along the Byrd Station Strain Network, Antarctica, using field data. There are found to be large longitudinal variations in basal drag and this result is little ...

    • Force budget: I. Theory and numerical methods 

      van der Veen, Cornelis J.; Whillans, I. M. (International Glaciological Society, 1989-10-05)
      A practical method is developed for calculating stresses and velocities at depth using field measurements of the geometry and surface velocity of glaciers. To do this, it is convenient to partition full stresses into ...

    • Flow laws for glacier ice: comparison of numerical predictions and field measurements 

      van der Veen, Cornelis J.; Whillans, I. M. (International Glaciological Society, 1990-10-05)
      Ice flow along the 20 km long strain network up-stream of the Dye 3 bore hole in Greenland is studied in detail. By solving the force—balance equations and using selected flow laws, stresses and strain-rates are calculated ...

    • State of balance of the cryosphere 

      van der Veen, Cornelis J. (American Geophysical Union, 1991-12-05)
      The current state of balance of the terrestrial ice sheets and glaciers is poorly known. What little data are available suggest that, worldwide, mountain glaciers have receded since about the mid-nineteenth century, with ...

    • Determination of a flow center on an ice cap 

      van der Veen, Cornelis J.; Whillans, I. M. (International Glaciological Society, 1992-11-05)
      A method for identifying the center of ice flow is developed and applied using results from surveys of a strain grid near the summit of Dunde Ice Cap (central China). Strain rates are used to compute stresses. These are ...

    • Patterns of calculated basal drag on ice streams B and C, Antarctica 

      Whillans, I. M.; van der Veen, Cornelis J. (International Glaciological Society, 1993-10-05)
      Patterns of strain rate and slope on the ice streams are unusual. They cannot be accounted for in the usual way as due to standing waves in ice flow over a basal obstruction to flow (such as a sticky spot) . The features ...

    • The role of lateral drag in the dynamics of Ice Stream B, Antarctica 

      Whillans, I. M.; van der Veen, Cornelis J. (International Glaciological Society, 1997-11-05)
      The partitioning of resistive force between the bed and sides of Ice Stream B, Antarctica , is obtained for three large areas that have bee n measured using repeat aerial photogrammetry. Problems associated with data ...

    • Surface roughness on the Greenland Ice Sheet from airborne laser altimetry 

      van der Veen, Cornelis J.; Krabill, William B.; Csatho, Bea M.; Bolzan, J. F. (American Geophysical Union, 1998-10-15)
      High resolution airborne laser altimetry is used to determine the small-scale surface relief in central Greenland and estimate the contribution from spatial noise to stratigraphic records. The standard deviation of the ...

    • Jakobshavn Glacier, west Greenland: 30 years of spaceborne observations 

      Sohn, Hong-Gyoo; Jezek, Kenneth C.; van der Veen, Cornelis J. (American Geophysical Union, 1998-07-05)
      Early 1960's reconnaissance satellite images are compared to more recent image and map data in an interannual and seasonal study of West Central Greenland margin fluctuations. From 1962 to 1992, ice sheet margins to the ...

    • Interannual variability in net accumulation on the Greenland Ice Sheet: Observations and implications for mass balance measurements 

      van der Veen, Cornelis J.; Bolzan, J. F. (American Geophysical Union, 1999-01-27)
      Nine 24-year accumulation records from the Summit region in central Greenland are analyzed to separate the effects of spatial noise and interannual fluctuations on the variability in each core. The study shows that both ...

    • Accumulation at South Pole: Comparison of two 900-year records 

      van der Veen, Cornelis J.; Mosley-Thompson, E.; Gow, Anthony J.; Mark, B. G. (American Geophysical Union, 1999-12-27)
      Two 900-year records of annual accumulation at South Pole are compared to evaluate the origin and significance of observed variations. Despite difficulties establishing absolute timescales, due to problems identifying ...

    • On the frequency distribution of net annual accumulation at the South Pole 

      van der Veen, Cornelis J.; Whillans, I. M.; Gow, Anthony J. (American Geophysical Union, 1999-01-15)
      The frequency distribution of stratigraphic layer thickness in cores and a snowmine at South Pole is not compatible with a significant number (>1%) of missing layers associated with zero-accumulation years inferred from ...

    • Transmission of stress between an ice stream and interstream ridge 

      Whillans, I. M.; van der Veen, Cornelis J. (International Glaciological Society, 2001-06-01)
      Measurements of strain rate are used to describe the stress distribution at the lateral margin of an active West Antarctic ice stream. The goal is to describe the way in which drag at the sides operates to control the ...

    • Trend surface analysis of Greenland precipitation 

      van der Veen, Cornelis J.; Vromwich, D. H.; Csatho, Bea M.; Kim, C. (American Geophysical Union, 2001-12-27)
      Multivariate regression methods are applied to measurements of accumulation covering much of the interior of the Greenland ice sheet to evaluate the important factors that describe the current distribution of accumulation. ...

    • Greenland Ice Sheet response to external forcing 

      van der Veen, Cornelis J. (American Geophysical Union, 2001-12-01)
      Kinematic wave modeling is used to evaluate possible responses of the Greenland ice sheet to changes in its surface mass balance. In the approach followed here the reference state is defined based on measured velocity and ...

    • Registering imagery to ICESat data for measuring elevation changes on Byrd Glacier, Antarctica 

      Schenk, Toni; Csatho, Bea M.; van der Veen, Cornelis J.; Brecher, H.; Ahn, Y.; Yoon, T. (American Geophysical Union, 2005-12-07)
      We present a new approach to derive control information from ICESat data that enables rigorous registration of aerial and satellite imagery. The technique, based on matching terrain features identified from ICESat measurements ...

    • ICESat measurements reveal complex pattern of elevation changes on Siple Coast ice streams, Antarctica 

      Csatho, Bea M.; Ahn, Y.; Yoon, T.; van der Veen, Cornelis J.; Vogel, S.; Hamilton, Gordon S.; Morse, D.; Smith, B.; Spikes, V. Blue (American Geophysical Union, 2005-12-03)
      We compare ICESat data (2003–2004) to airborne laser altimetry data (1997–98 and 1999–2000) to monitor surface changes over portions of Van der Veen (VdVIS), Whillans (WIS) and Kamb ice streams (KIS) in the Ross Embayment ...

    • Bed radar reflectivity across the north margin of Whillans Ice Stream, West Antarctica, and implications for margin processes 

      Raymond, C. F.; Catania, Ginny A.; Nereson, Nadine; van der Veen, Cornelis J. (International Glaciological Society, 2006-01-01)
      Surface-based ice-penetrating radar profiles were made across the active north margin (the Snake) of the upper part of Whillans Ice Stream (formerly Ice Stream B, branch B2), West Antarctica, at three locations. Low frequency ...

    • Controls on advance of tidewater glaciers: results from numerical modeling applied to Columbia Glacier 

      Nick, F. M.; van der Veen, Cornelis J.; Oerlemans, J. (American Geophysical Union, 2007-07-11)
      A one-dimensional numerical ice flow model is used to study the advance of a tidewater glacier into deep water. Starting with ice-free conditions, the model simulates glacier growth at higher elevations followed by advance ...

    • Subglacial topography and geothermal heat flux: potential interactions with drainage of the Greenland ice sheet 

      van der Veen, Cornelis J.; Leftwich, T.; von Frese, R.; Csatho, Bea M.; Li, Jilu (American Geophysical Union, 2007-06-05)
      [1] Many of the outlet glaciers in Greenland overlie deep and narrow trenches cut into the bedrock. It is well known that pronounced topography intensifies the geothermal heat flux in deep valleys and attenuates this flux ...