L. Padman and H. A. Fricker; Presentation at the West Antarctic Ice Sheet (WAIS) Meeting, Washington DC, 2005 Peninsula-area Ice Shelf Plans, 2006-2009.

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Presentation transcript:

L. Padman and H. A. Fricker; Presentation at the West Antarctic Ice Sheet (WAIS) Meeting, Washington DC, 2005 Peninsula-area Ice Shelf Plans, Laurie Padman and Colleagues * * Helen Fricker (Scripps); Ian Joughin (APL/UW); Gary Egbert (Oregon State U.), Matt King (U. Newcastle, UK)

L. Padman and H. A. Fricker; Presentation at the West Antarctic Ice Sheet (WAIS) Meeting, Washington DC, 2005 Ice shelf tides; basal melt

L. Padman and H. A. Fricker; Presentation at the West Antarctic Ice Sheet (WAIS) Meeting, Washington DC, Improved Tide Modeling Status: Funded (NASA) – ESR, Scripps, OSU (& U. Newcastle) Higher resolution (now ~2 km, move to ~1 km) Start to resolve tidal flexure in GZ (guided by ICESat GZ studies) Improved assimilation; coastal tide gauges, ERS/RA2 radar altimetry over ice shelves, ICESat laser altimetry?

L. Padman and H. A. Fricker; Presentation at the West Antarctic Ice Sheet (WAIS) Meeting, Washington DC, Improved Tide Modeling Field plans: Improve tide gauge database Matt King & BAS: ~10 GPS (2 mo. to 1 yr) on FRIS and Larsen-C, 2008/09

L. Padman and H. A. Fricker; Presentation at the West Antarctic Ice Sheet (WAIS) Meeting, Washington DC, GZ studies with ICESat A and B are onshore and offshore limits of tidal flexure. Dashed lines show offshore tide model prediction of I.S. displacement. GZ width ~8 km. Transect across SW Ronne I.S.

L. Padman and H. A. Fricker; Presentation at the West Antarctic Ice Sheet (WAIS) Meeting, Washington DC, Larsen C basal melt Larsen C mass balance analyses and ocean/ice-shelf modeling Status: funded (NASA)  New velocity fields (from InSAR)  Ice thickness studies (review ERS/Envisat, add ICESat)  3-D circulation model with tides. Investigate effect of ice shelf thinning on circulation and future melt: +ve or –ve feedback? Thinning rate (m/year) from Shepherd et al. Current velocity map; I. Joughin