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Marine Ice in Larsen Ice Shelf

Marine Ice in Larsen Ice Shelf. Paul Holland, Hugh Corr, David Vaughan, Adrian Jenkins British Antarctic Survey Pedro Skvarca Instituto Antarctico Argentino. Diminishing ice shelves. (Morris & Vaughan, 2003). (Shepherd et al., 2003). General ocean conditions. -1.6. MWDW. WDW. +0.5.

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Marine Ice in Larsen Ice Shelf

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  1. Marine Ice in Larsen Ice Shelf Paul Holland, Hugh Corr, David Vaughan, Adrian Jenkins British Antarctic Survey Pedro Skvarca Instituto Antarctico Argentino

  2. Diminishing ice shelves (Morris & Vaughan, 2003) (Shepherd et al., 2003)

  3. General ocean conditions -1.6 MWDW WDW +0.5 0 (Boheme zonal) WSBW WSDW -0.4 (Clarke et al., in press) (Boheme et al., 1994)

  4. 1997-98 RES survey

  5. ‘Oceanic’ freezing

  6. The model

  7. Illustrative results

  8. Larsen Ice Shelf – basic case

  9. Basic case vs. obs

  10. Basic and Warm (+0.5°C) cases

  11. How might warming occur? -1.6 -1.6 -1.6 +0.5 +0.5 +0.5 0 0 0 ANT X/7 May 1992 Jan 1993 Dec 2004 (Boheme et al., 1994; Absy et al, 2008)

  12. Conclusions • Missing basal echoes imply marine ice bands • Marine bands stabilise the ice shelf • Model suggests that warmer ocean curtails • marine ice formation

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