Dear Alison, after discussions with Bruno Tremblay, we only have some minor comments on your suggested definitions: > 1. sea_ice_horizontal_shear_strain_rate_maximum_over_coordinate_rotation > (s-1) > Stress is the symmetric component of the tensor representing the > gradient of internal forces (e.g. in ice). Shear stress refers to > off-diagonal element(s) of the stress tensor (a single element for > horizontal shear stress). "Horizontal" refers to the local horizontal > in the location of the sea ice, i.e., perpendicular to the local gravity > vector. Each of the stress components is defined with respect to a frame > of reference. "Coordinate rotation" refers to the range of all possible > orientations of the frame of reference. The shear stress has a maximum > value relative to one of these orientations. The maximum over coordinate > rotations of the shear strain rate, often referred to as the maximum > shear strain [rate], represents the second invariant of strain rate.
- It should be "strain rate" instead of "stress" everywhere. - "Stress is the symmetric component of the tensor..." should read "Axial strain is the symmetric component of the tensor..." > > 2. sea_ice_horizontal_shear_stress_maximum_over_coordinate_rotation > (N m-1) > Stress is the symmetric component of the tensor representing the > gradient of internal forces (e.g. in ice). Shear stress refers to > off-diagonal element(s) of the stress tensor (a single element for > horizontal shear stress). "Horizontal" refers to the local horizontal > in the location of the sea ice, i.e., perpendicular to the local gravity > vector. Each of the stress components is defined with respect to a frame > of reference. "Coordinate rotation" refers to the range of all possible > orientations of the frame of reference. The shear stress has a maximum > value relative to one of these orientations. The maximum over coordinate > rotations of the shear stress, often referred to as the maximum shear > stress, represents the second invariant of stress. - "Stress is the symmetric component of the tensor..." should read "Axial stress is the symmetric component of the tensor... > > 3. sea_ice_average_normal_horizontal_stress > (N m-1) > Stress is the symmetric component of the tensor representing the > gradient of internal forces (e.g. in ice). Horizontal stress refers to > the stress in the horizontal plane. "Horizontal" refers to the local > horizontal in the location of the sea ice, i.e., perpendicular to the > local gravity vector. Average normal stress refers to the average of the > diagonal elements of the stress tensor and represents the first > invariant of stress. - "Stress is the symmetric component of the tensor..." should read "Axial stress is the symmetric component of the tensor... Best, Dirk ---- Dr. Dirk Notz http://www.mpimet.mpg.de/~notz.dirk _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
