{"666983":{"#nid":"666983","#data":{"type":"event","title":"PhD Defense by Elizabeth Spiers","body":[{"value":"\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003EDate:\u003C\/strong\u003E April 13th \u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003ETime\u003C\/strong\u003E: 2pm ET\u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003EDefense Location\u003C\/strong\u003E: Ford ES\u0026amp;T L1114\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003ETitle: \u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003Cspan\u003E\u003Cspan\u003EThe Habitable Ocean World Box (HOWBOX) Model: Coupling Europa\u2019s Thermal and Chemical Evolution \u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003EAdvisor: \u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003Cspan\u003E\u003Cspan\u003EDr. Britney Schmidt\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003ECommittee: \u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003Cspan\u003E\u003Cspan\u003EJames Wray, Annalisa Bracco, Christopher Reinhard, Sanjoy Som\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003EAbstract: \u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003Cspan\u003E\u003Cspan\u003E\u0026nbsp;Europa, a moon of Jupiter, has evidence for a liquid water ocean in contact with a rocky mantle beneath its icy surface. Due to the presence of this ocean, Europa has been a primary target for investigations of habitability within our solar system. Europa\u2019s ocean has remained liquid, in part, due to tidal heating in the interior. However, this interior tidal heat production has likely varied and potentially even been oscillatory over Europa\u2019s history due to evolving orbital eccentricity. Such thermal oscillations will affect Europa\u2019s interior geochemistry, defining changes to chemical and energy inventories for putative biology. Therefore, Europa\u2019s long-term habitability depends on both geochemical pathways and thermodynamics\u2014modulated by tidal evolution\u2014that define chemical and energy inventories. Here, we demonstrate how thermally-modulated volumetric changes to Europa\u2019s ice shell, ocean, and fluid-accessible rocky mantle affect oceanic composition in Europa\u2019s interior due to variation in salinity, reduced volatile flux from the seafloor, and oxidized material delivery from the ice shell. We find that Europa may have undergone major oxidation events in its past during periods of increased orbital eccentricity, with oxidant flux increasing by up to 10 orders of magnitude, affecting the composition of the ocean. We also find that stable hydrogen flux into the ocean from serpentinization is tied to the water activity of the ocean and pore fluids, which also vary with heat production. Periods of fluctuating heat production, driven by orbital dynamics, can result in substantial oscillations to hydrogen flux ranging from 100 -1013 moles of H2 per year, with the degree of variability controlled by the dissolved ion composition and concentration. These results suggest new ways that water activity and salinity of the ocean are important to stability of habitable conditions in ocean worlds. By demonstrating that Europa\u2019s ocean composition will be sensitive to its orbital dynamics and the degree to which it undergoes oscillatory tidal heat production, we reinforce that Europa\u2019s long-term habitability is directly tied to its thermal-orbital history. \u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EThe Habitable Ocean World Box (HOWBOX) Model: Coupling Europa\u2019s Thermal and Chemical Evolution \u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"The Habitable Ocean World Box (HOWBOX) Model: Coupling Europa\u2019s Thermal and Chemical Evolution  "}],"uid":"27707","created_gmt":"2023-03-31 17:25:40","changed_gmt":"2023-03-31 17:25:40","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2023-04-13T14:00:47-04:00","event_time_end":"2023-04-13T16:00:47-04:00","event_time_end_last":"2023-04-13T16:00:47-04:00","gmt_time_start":"2023-04-13 18:00:47","gmt_time_end":"2023-04-13 20:00:47","gmt_time_end_last":"2023-04-13 20:00:47","rrule":null,"timezone":"America\/New_York"},"location":"Ford ES\u0026T L1114","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}