Data assimilation using a hybrid ice flow model

D. N. Goldberg, O. V. Sergienko

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Hybrid models, or depth-integrated flow models that include the effect of both longitudinal stresses and vertical shearing, are becoming more prevalent in dynamical ice modeling. Under a wide range of conditions they closely approximate the well-known First Order stress balance, yet are of computationally lower dimension, and thus require less intensive resources. Concomitant with the development and use of these models is the need to perform inversions of observed data. Here, an inverse control method is extended to use a hybrid flow model as a forward model. We derive an adjoint of a hybrid model and use it for inversion of ice-stream basal traction from observed surface velocities. A novel aspect of the adjoint derivation is a retention of non-linearities in Glen's flow law. Experiments show that in some cases, including those nonlinearities is advantageous in minimization of the cost function, yielding a more efficient inversion procedure.

Original languageEnglish (US)
Pages (from-to)315-327
Number of pages13
JournalCryosphere
Volume5
Issue number2
DOIs
StatePublished - 2011

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Earth-Surface Processes

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