Tanner Gibson graduates from Cal Poly
This spring, MCRN member Tanner Gibson graduated from California Polytechnic State University (Cal Poly) at San Luis Obispo. For the last two years, he has been working with MCRN node-leader Charles D. Camp, a professor in the Department of Mathematics at Cal Poly, on the time series analysis of paleoclimate data records and the development and analysis of computational models for the Pleistocene climate.
Their study is focused on using new analysis techniques to analyze recent benthic (ocean sediment) records in order to characterize the Mid-Pleistocene transition (MPT) in the Earth's climate. Analyses of ocean sediment records are a primary tool for the study of the glacial cycles of the Pleistocene and the transition in character of those cycles between the early and late Pleistocene. Recently, two such records, containing proxies for global temperature and ice volume, have been constructed with independent age models devoid of orbital assumptions. Gibson and Camp analyzed these records using a relatively new time series analysis technique – Empirical Mode Decomposition (EMD). EMD is a local, nonlinear, data-adaptive technique; as such, it is well suited for the study of nonlinear and nonstationary data. Their analyses of both records clearly identified the emergence of new 100-kyr glacial cycles at approximately 1.25 Myr ago. They also isolated 40-kyr cycles which persist throughout the entire Pleistocene. A comparison of the two analyses also reveals discrepancies which could potentially identify weaknesses in the age models used to construct the data records. Dave Camp recently presented these findings at the 30th IUGG Conference on Mathematical Geophysics in Merida, Mexico, on June 3rd, 2014.
Tanner will continue to work with Dave Camp during the summer. In addition to preparing their research for publication, Tanner will help to usher in a new group of undergraduate students into Climate Research as part of Cal Poly's summer research program. He hopes to stay closely connected with MCRN, eventually as a graduate student.