An AMD_USAPDC project investigated crystal orientation fabrics in ice sheets and their relation to stratigraphic disturbances. Research developed uncertainty estimates for fabric parameters and applied them to data from the WAIS Divide, WAIS, Siple Dome, and NEEM ice cores. The project concluded in 2017.
Use Cases
- Estimate uncertainty for fabric eigenvalues derived from thin-section c-axis measurements using novel statistical methods.
- Fit parameterized orientation-distribution functions like the Bingham distribution to thin-section data using maximum-likelihood methods.
- Infer spatially-continuous ice fabric records by combining thin-section measurements with corrected borehole sonic velocity data.
- Model the stability of coupled anisotropic ice flow and fabric evolution to understand the development of shear bands and stratigraphic folding.
Strengths
- Analysis incorporates data from multiple major ice core sites: WAIS Divide, WAIS, Siple Dome, and NEEM.
- Developed novel, mathematically-justified uncertainty estimates for key fabric parameters.
Limitations
- Sample size and specific row/column counts for the underlying measurement data are unknown.
- Sonic velocity measurements from WAIS and NEEM were noted to have large amounts of low spatial-frequency error, limiting their utility in isolation.
Provenance
- Source
- AMD_USAPDC project, hosted on NASA EarthData.
- Collection Method
- Data derived from ice core thin-section measurements and borehole sonic velocity measurements, analyzed with novel statistical and modeling techniques.
- Time Range
- null
- Freshness
- null
- Geography
- Ice core sites include WAIS Divide, WAIS, Siple Dome (West Antarctica), and NEEM (Greenland).