Geography & Atmospheric Science: Recent submissions

Now showing items 161-180 of 386

    • Seasonal variations in brightness temperature for central Antarctica 

      van der Veen, Cornelis J.; Jezek, Kenneth C. (International Glaciological Society, 1993-01-01)

    • New and improved determinations of velocity of ice streams B and C, West Antarctica 

      Whillans, I. M.; van der Veen, Cornelis J. (International Glaciological Society, 1993-01-01)
      Measurements of velocity have been made on and next to Ice Streams B and C, West Antarctica. The results are more precise than previous work and constitute a 93% increase in the number of values. These velocities are used ...

    • Effect of extension rate on terminus position, Columbia Glacier, Alaska, U.S.A 

      Venteris, E. R.; Whillans, I. M.; van der Veen, Cornelis J. (International Glaciological Society, 1997-01-01)

    • Reply to Lliboutry's letter 'Why calculated basal drags of ice streams can be fallacious' 

      van der Veen, Cornelis J.; Whillans, I. M. (International Glaciological Society, 1995-01-01)
      No abstract is available for this item.

    • Tidewater calving 

      van der Veen, Cornelis J. (International Glaciological Society, 1996-01-01)
      Data from Columbia Glacier are used to identify processes that control calving from a temperate tidewater glacier and to re-evaluate models that have been proposed to describe iceberg calving. Since 1981, Columbia Glacier ...

    • Model experiments on the evolution and stability of ice streams 

      van der Veen, Cornelis J.; Whillans, I. M. (International Glaciological Society, 1996-01-01)

    • Weaving Indigenous science, protocols and sustainability science 

      Whyte, Kyle Powys; Brewer, Joseph P., II; Johnson, Jay T. (Springer, 2015-04-02)
      The proceedings of the National Science Foundation supported WIS2DOM workshop state that sustainability scientists must respect the “protocols” of practitioners of Indigenous sciences if the practitioners of the two knowledge ...

    • Force budget: III, Application to three-dimensional flow of Byrd Glacier, Antarctica 

      Whillans, I. M.; Chen, Y. H.; van der Veen, Cornelis J.; Hughes, T. J. (International Glaciological Society, 1989-09-05)
      Stresses at the surface and at depth are calculated for a stretch of Byrd Glacier, Antarctica. The calculations are based on photogrammetrically determined velocities and elevations, and on radio-echo-determined ice ...

    • 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 ...