{"605051":{"#nid":"605051","#data":{"type":"event","title":"Seminar: Jacqueline Austermann","body":[{"value":"\u003Cp\u003EDr. Jacqueline Austermann, University of Michigan\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Ch3\u003E\u003Cstrong\u003E\u0026quot;Reconstructing Last Interglacial Sea Level on a Deforming Earth\u0026quot;\u003C\/strong\u003E\u003C\/h3\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EABSTRACT\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003ETo gain\u0026nbsp;insight into the question of ice sheet stability and sea level change in the\u0026nbsp;face of global warming, scientists have turned to studying warm periods in the\u0026nbsp;geologic past. The\u0026nbsp;Last Interglacial (LIG), ~125 ka, has been of particular\u0026nbsp;interest in this regard since atmospheric CO2\u0026nbsp;concentrations during\u0026nbsp;the LIG were comparable to pre-industrial values and\u0026nbsp;temperatures were\u0026nbsp;consistent with simulations of 1-2\u0026ordm; global warming.\u003Cbr \/\u003E\r\nEstimating\u0026nbsp;peak global mean sea level, or equivalently minimum ice volumes, during the\u0026nbsp;Last Interglacial requires that the elevation of local sea level records be\u0026nbsp;corrected for\u0026nbsp;processes that distort local sea level relative to the global\u0026nbsp;average. One such process is glacial isostatic adjustment (GIA), which is the\u0026nbsp;change in topography that occurs due to\u0026nbsp;the loading (or unloading) of the Earth\u0026nbsp;with ice and water. Studies that have taken this process into account conclude\u0026nbsp;that LIG global mean sea level peaked 6-9m above present-levels.\u003Cbr \/\u003E\r\nIn this\u0026nbsp;talk I will address previously unrecognized uncertainties in the GIA correction\u0026nbsp;that stem from our incomplete knowledge of the temporal evolution of ice sheets\u0026nbsp;prior to and\u0026nbsp;during the LIG. I will further talk about the role of dynamic\u0026nbsp;topography in deforming and biasing the LIG sea level record globally. Dynamic\u0026nbsp;topography is the topography that is\u0026nbsp;supported by viscous flow and buoyancy\u0026nbsp;variations in the Earth\u0026rsquo;s mantle. To date, this global scale process has been\u0026nbsp;ignored in sea level studies of Pleistocene interglacials,\u0026nbsp;including the LIG,\u0026nbsp;under the assumption that the signal would be negligible. I will show that modeled\u0026nbsp;deflections span several meters, that they are significantly correlated with\u0026nbsp;observed\u0026nbsp;sea level highstands and that they are consistent with construction and\u0026nbsp;preservation attributes across different sea level indicator types.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Reconstructing Last Interglacial Sea Level on a Deforming Earth"}],"uid":"33273","created_gmt":"2018-04-12 21:22:46","changed_gmt":"2018-04-12 21:28:28","author":"Emanuele Di Lorenzo","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2018-04-19T12:00:00-04:00","event_time_end":"2018-04-19T13:00:00-04:00","event_time_end_last":"2018-04-19T13:00:00-04:00","gmt_time_start":"2018-04-19 16:00:00","gmt_time_end":"2018-04-19 17:00:00","gmt_time_end_last":"2018-04-19 17:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"hg_media":{"605050":{"id":"605050","type":"image","title":"EAS Seminar Jacqueline Austermann","body":null,"created":"1523567941","gmt_created":"2018-04-12 21:19:01","changed":"1523567941","gmt_changed":"2018-04-12 21:19:01","alt":"","file":{"fid":"230683","name":"4-19_Austermann.png","image_path":"\/sites\/default\/files\/images\/4-19_Austermann.png","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/images\/4-19_Austermann.png","mime":"image\/png","size":466879,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/4-19_Austermann.png?itok=QOFFz_IJ"}}},"media_ids":["605050"],"groups":[{"id":"565971","name":"Ocean Science and Engineering (OSE)"}],"categories":[],"keywords":[{"id":"177683","name":"EAS Seminar Jacqueline Austermann"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}