Brief communication: Is vertical shear in an ice shelf (still) negligible?

Abstract. Vertical shear is recognized today as a key component of the stress balance ice shelves. However, first shelf models were built on neglect vertical shear. Partly due to its historical treatment, it remains common discuss though still considered negligible in models. Here, we offer perspective changing treatment over time, and emphasize term's non-negligibility current modeling. We illustrate our discussion simplest context an analytic, isothermal, shallow-ice-shelf model.