Numerical modeling of ocean-ice interactions under Pine Island Bay's ice shelf

AJ Payne, PR Holland, A Shepherd, IC Rutt, A Jenkins, I Joughin

Research output: Contribution to journalArticle (Academic Journal)peer-review

98 Citations (Scopus)

Abstract

A two-dimensional numerical model is used to simulate the dynamics of buoyant, meltwater-rich plumes flowing beneath the ice shelf occupying much of Pine Island Bay, West Antarctica. Recent studies have shown that this ice shelf, along with all others fringing the Amundsen Sea, is thinning rapidly. In the model, both the Coriolis effect and subshelf topography are important in controlling plume dynamics and the spatial distribution of ice melt. Melt is concentrated in a narrow zone within ~20 km of the grounding line where steep subshelf slopes and access to warm ambient water allow melt rates to exceed 100 m yr-1. The plume generated by entrainment of ambient water into the meltwater in these areas is guided by the topography of the ice shelf underside and exits the ice shelf at three distinct outflow locations. Melt rates generated along the course of the plume are higher (approximately 2.5x) than rates elsewhere. The model suggests that the observed ice shelf thinning rates could have resulted from a hypothetical instantaneous 0.25°C warming of the ambient water entrained by the plume. A context for this value is provided by the 40-year warming trend documented by Jacobs et al. (2002) for Circumpolar Deep Water in the nearby Ross Sea.
Translated title of the contributionNumerical modeling of ocean-ice interactions under Pine Island Bay's ice shelf
Original languageEnglish
Article numberC10019
Number of pages14
JournalJournal of Geophysical Research: Oceans
Volume112
Issue numberC10
DOIs
Publication statusPublished - Oct 2007

Bibliographical note

Publisher: American Geophysical Union

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