期刊
JOURNAL OF GLACIOLOGY
卷 58, 期 208, 页码 399-406出版社
CAMBRIDGE UNIV PRESS
DOI: 10.3189/2012JoG11J176
关键词
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资金
- Antarctic Geospatial Information Center
- University Navstar Consortium (UNAVCO)
- US National Science Foundation Office of Polar Programs [0838843, 0229245, 9527571]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [0229245] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [0838843, 9527571] Funding Source: National Science Foundation
We present a new surface-balance and ice-motion dataset derived from high-precision GPS measurements from a network of steel poles within three icefields of the Allan Hills blue-ice area, Antarctica. The surveys were conducted over a 14 year time period. Ice-flow velocities and mass-balance estimates for the main icefield (MIF) are consistent with those from pre-GPS era measurements but have much smaller uncertainties. The current study also extends these measurements through the near-western icefield (NWIF) to the eastern edge of the mid-western icefield (MWIF). The new dataset includes, for the first time, well-constrained evidence of upward motion within the Allan Hills MIF, indicating that old ice should be present at the surface. These data and terrestrial meteorite ages suggest that paleoclimate reconstructions using the surface record within the Allan Hills MIF could potentially extend the ice-core-based record beyond the 800 000 years currently available in the [PICA Dome C core.
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