1. RESEARCH POSTER PRESENTATION DESIGN © 2012 www.PosterPresentations.com QUICK DESIGN GUIDE (--THIS SECTION DOES NOT PRINT--) This PowerPoint 2007 template produces a 44”x44” professional poster. You can use it to create your research poster and save valuable time placing titles, subtitles, text, and graphics. We provide a series of online tutorials that will guide you through the poster design process and answer your poster production questions. To view our template tutorials, go online to PosterPresentations.com and click on HELP DESK. When you are ready to print your poster, go online to PosterPresentations.com. Need Assistance? Call us at 1.866.649.3004 Object Placeholders Using the placeholders To add text, click inside a placeholder on the poster and type or paste your text. To move a placeholder, click it once (to select it). Place your cursor on its frame, and your cursor will change to this symbol. Click once and drag it to a new location where you can resize it. 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This template is at 100% the size of the final poster. All text and graphics will be printed at 100% their size. To see what your poster will look like when printed, set the zoom to 100% and evaluate the quality of all your graphics before you submit your poster for printing. Modifying the layout This template has four different column layouts. Right-click your mouse on the background and click on LAYOUT to see thelayout options. The columns in the provided layouts are fixed and cannot be moved but advanced users can modify any layout by going to VIEW and then SLIDE MASTER. Importing text and graphics from external sources TEXT: Paste or type your text into a pre-existing placeholder or drag in a new placeholder from the left side of the template. Move it anywhere as needed. PHOTOS: Drag in a picture placeholder, size it first, click in it and insert a photo from the menu. TABLES: You can copy and paste a table from an external document onto this poster template. To adjust the way the text fits within the cells of a table that has been pasted, right-click on the table, click FORMAT SHAPE then click on TEXT BOX and change the INTERNAL MARGIN values to 0.25. Modifying the color scheme To change the color scheme of this template go to the DESIGN menu and click on COLORS. You can choose from the provided color combinations or create your own. © 2013 PosterPresentations.com 2117 Fourth Street, Unit C Berkeley CA 94710 posterpresenter@gmail.com The International Ocean Discovery Program is a deep-sea drilling collaboration that aims to “recover geological data and samples from beneath the ocean floor to study the history and dynamics of Planet Earth” (IODP website). The samples used in this research were taken from cores recovered during the 113 th expedition of ODP. This project focuses on Core 693A-8R from in the Weddell Sea adjacent to Dronning Maud Land, Antarctica that was deposited during the Pliocene epoch. The Pliocene epoch is of particular interest as atmospheric CO 2 levels were around 400ppm, about the same as current levels. The sea level during this time was significantly higher than today. Our research focuses on tying sedimentation patterns throughout the core to Milankovitch cycles. INTRODUCTION METHODS RESULTS (cont’d) CONCLUSIONS The sedimentation rate during the Pliocene at our core site was high (on the order of 10cm/kyr) as supported by all four datasets as well as the diatom record. Our results suggest that obliquity was the dominant forcing during this period as evidenced by the prominent peaks displayed by the wavelets at that periodicity. 19,000-year precession was the secondary Milankovitch cycle in terms of dominance. 1 Wesleyan University, Middletown, CT 06459, 2 Vassar College, Poughkeepsie, NY 12604, 3 Kent State University, Kent, OH 44240 James Hall 1, Tavo True-Alcala 1, Jason Gross 1, Vanessa Castello 1, Cassandra Stirpe 2, Joseph Ortiz 3, and Suzanne OConnell 1 Comparison of XRF and Spectral Reflectance Derived Cyclicity in Pliocene Sediments from ODP Site 693, Dronning Maud Land Antarctica Our research uses four datasets: diffuse spectral reflectance (DSR), XRF element counts, oxide weight percent, and magnetic susceptibility. 1.The XRF scanner collected a continuous downcore dataset whereas reflectance data was collected using a photospectrometer on discrete fine-grain (<63 um) samples throughout the core. The magnetic susceptibility dataset is also continuous downcore data. 2.Varimax-rotated Principal Component Analysis (VPCA), a data reduction technique that separates large datasets into condensed components, was used to highlight the underlying relationships within the XRF and DSR data. 3.Wavelet Analysis was used to identify the amplitude and lengths of the periodicities of the rotated components as well as the magnetic susceptibility data. 4.Milankovitch Cycles were assigned to the periodicities extracted from the wavelet analyses and were used to determine sedimentation rates throughout the core. Preliminary diatom data can give us a sense of absolute dating as well as estimated sedimentation rates. Using the earliest dates for first and last appearances of R. Costata, we calculated a starting age of 4.183Ma and a sedimentation rate of 10.01cm/kyr which falls within the range calculated from our wavelets. Using the later dates for R. Costata, we calculated a starting age of 4.291Ma and a sedimentation rate of 8.36cm/kyr. Rates were generally similar but did vary between the 19 and 41kyr cycles, as shown below. We identified a total of 12 significant components from VPCA across the three different datasets. The majority of wavelet plots generated from the components showed two strong peaks of periodicity: one with a length around 440cm and the other with a length around 180cm. Wavelet output for the first DSR and XRF count components. Peaks for both are around 500cm and 180cm and are significant beyond our chosen red noise level. Comparison across the results from all four datasets show similar sedimentation rates after peaks have been assigned to 41,000 year obliquity and 19,000 year precession cycles. Results are summarized in the table below. RESULTS Location of ODP 113-693A shown by red arrow (image from nasa.gov). Comparison of sedimentation rates derived from earliest and latest diatom records and VPCA component data. Table comparing sedimentation rates based on components from all four datasets.