Author(s): Donald K. Perovich; Kathleen F. Jones; Walter B. Tucker Iii
Linked Author(s): Kathleen Jones
Keywords: No Keywords
Abstract: Measurements of ice stresses were made from September through November in first-year and multiyear sea ice in the Eastern Arctic ice pack. Observed stresses were typically less than 50 kPa with peak values reaching 400 kPa in young ice and 150 kPa in the interior of a multiyear floe. The largest stresses were always observed in the upper half of the ice sheet. Three sources of ice stress were identified in the multiyear record: 1) stresses induced by temperature changes, 2) stresses resulting from inertial oscillations of the ice pack, and 3) stresses occurring during deformation events. Stresses in the first year ice were caused by inertial motions and by deformation. Under certain loading conditions strong coupling was evident between the thin firstyear ice and the adjacent multiyear floes, with stresses being greatest in the young ice and rapidly attenuating away from the floe edge in the multiyear ice. The stress field in the ice pack was complex and showed great spatial and temporal variability. A twodimensional finite element model (ABAQUS) was used to interpret the point stress measurements and to estimate the stress distribution in the ice associated with unidirectional loading.
Year: 1992