West Antarctic Ice Core Chemistry and Self-Organizing Maps: A First Look David B. Reusch and Richard...
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Transcript of West Antarctic Ice Core Chemistry and Self-Organizing Maps: A First Look David B. Reusch and Richard...
West Antarctic Ice Core West Antarctic Ice Core Chemistry and Self-Organizing Chemistry and Self-Organizing
Maps: A First LookMaps: A First Look
David B. Reusch and Richard B. AlleyDavid B. Reusch and Richard B. AlleyDepartment of GeosciencesDepartment of Geosciences
and EMS Environment Instituteand EMS Environment Institute
Penn State UniversityPenn State University
Funded by the Office of Polar ProgramsFunded by the Office of Polar Programsand the Division of Atmospheric Sciences, and the Division of Atmospheric Sciences,
National Science FoundationNational Science Foundation
Paul A. MayewskiPaul A. MayewskiDepartment of Earth SciencesDepartment of Earth Sciencesand Climate Change Instituteand Climate Change Institute
University of MaineUniversity of Maine
Self-organizing Maps (SOMs)Self-organizing Maps (SOMs)
A projection (mapping) A projection (mapping) from the multidimensional from the multidimensional input space to the 2-D input space to the 2-D pattern spacepattern spacePatterns arranged in a Patterns arranged in a grid by similarity (closer = grid by similarity (closer = more)more)
A tool for extracting generalized A tool for extracting generalized patterns of variability from patterns of variability from
multivariate datamultivariate data
Flexible grid size based on Flexible grid size based on problem being studiedproblem being studied
Self-organizing Maps (SOMs)Self-organizing Maps (SOMs)
Each input record Each input record matches one pattern matches one pattern most closelymost closelyRecords matching the same Records matching the same pattern have it in commonpattern have it in common
Also used for classifying multivariate Also used for classifying multivariate data and studying its temporal data and studying its temporal
behaviorbehavior
Basis for frequency, Basis for frequency, transition and trajectory transition and trajectory mapsmaps
Holocene West AntarcticaHolocene West Antarctica Environmental Context Environmental Context
Retreating ice sheetRetreating ice sheet Elevation changes at Siple DomeElevation changes at Siple Dome Changing distance to sea ice/open Changing distance to sea ice/open
waterwater Other circulation changes?Other circulation changes?
A Brief Look AtA Brief Look AtTaylor DomeTaylor Dome
Future WorkFuture Work
Further SOM-based analysis of ice Further SOM-based analysis of ice core chemistry data to assess the core chemistry data to assess the value of this technique for these datavalue of this technique for these data Continue with Siple Dome/Taylor DomeContinue with Siple Dome/Taylor Dome Add other useful sites/coresAdd other useful sites/cores Add non-seasalt chemistryAdd non-seasalt chemistry
Comparisons with other data sources Comparisons with other data sources on the climate history of this regionon the climate history of this region