期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 17, 页码 9093-9102出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL070259
关键词
Pine Island Glacier
资金
- National Science Foundation [ANT-0424589]
- NASA [NNX12AN36H, NNX13AP96G]
- APL startup funds
- Polar Geospatial Center
- NASA [NNX13AP96G, 465181, NNX12AN36H, 69764] Funding Source: Federal RePORTER
We produced a 6year time series of differential tidal displacement for Pine Island Ice Shelf, Antarctica, using speckle-tracking methods applied to fine-resolution TerraSAR-X data. These results reveal that the main grounding line has maintained a relatively steady position over the last 6years, following the speedup that terminated in similar to 2009. In the middle of the shelf, there are grounded spots that migrate downstream over the 6year record. Examination of high-resolution digital elevation models reveals that these grounded spots form where deep keels (thickness anomalies) advect over an approximately flow-parallel bathymetric high, maintaining intermittent contact with the bed. These data sets also reveal several subsidence and uplift events associated with subglacial lake drainages in the fast-flowing region above the grounding line. Although these drainages approximately double the rate of subglacial water flow over periods of a few weeks, they have no discernible effect on horizontal flow speed.
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