{"641288":{"#nid":"641288","#data":{"type":"event","title":"The Role of Dust on Earth\u2019s Climate: Insights from the Paleoclimate Record \u0026 Modern Ecosystems","body":[{"value":"\u003Ch4\u003E\u003Cstrong\u003EThe School of Earth and Atmospheric Sciences Presents Dr. Sarah Aarons, Scripps Institution of Oceanography, University of California San Diego\u003C\/strong\u003E\u003C\/h4\u003E\r\n\r\n\u003Cp\u003EThe Role of Dust on Earth\u0026rsquo;s Climate: Insights from the Paleoclimate Record \u0026amp; Modern Ecosystems\u003C\/p\u003E\r\n\r\n\u003Cdiv\u003EDust is a long-recognized component of the lithosphere-atmosphere-ocean system, strongly linked to variations in Earth\u0026rsquo;s climate. Dust is fine grained sediment that is associated with dry, arid areas where constant wind erosion and lack of vegetation allows for the accumulation of large amounts available for transport via wind.\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003E\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003EDust is also an important constituent in high latitude, Polar regions, formed by the physical grinding of ice sheets and glaciers over bedrock, where rapid advances during cold periods produce large amounts, or rapid retreats leave behind a layer of sediment previously covered by ice.\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003E\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003EThe generation and transport of dust from a source area to its sink is strongly related to climate on timescales ranging from seasonal to glacial-interglacial, and can be an important source of critical nutrients capable of enhancing primary productivity in both terrestrial and marine environments.\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003E\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003EIn this seminar, I will discuss dust compositional variations to a montane ecosystem in the context of catastrophic drought conditions, and the role of dust as a source of nutrients to this site. Another aspect of the dust cycle is its behavior on longer timescales; changes in the composition of dust trapped in Antarctic ice provide glimpses of past atmospheric circulation and earth surface conditions.\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003E\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003EI will discuss the sources and transport pathways of dust to East Antarctica during several climate periods spanning from the last interglacial period (130,000 years ago) to the present. Distinct dust compositions during separate interglacial periods suggest significant differences in conditions at the dust source areas and a large-scale shift in atmospheric dynamics to this peripheral Antarctic site, perhaps precipitated by deglacial conditions and a reduction of the West Antarctic Ice Sheet.\u003C\/div\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"A seminar by Dr. Sarah Aarons, School of Earth and Atmospheric Sciences"}],"uid":"34458","created_gmt":"2020-11-13 13:41:23","changed_gmt":"2020-11-18 12:38:22","author":"nlawson3","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2020-12-03T11:00:00-05:00","event_time_end":"2020-12-03T12:00:00-05:00","event_time_end_last":"2020-12-03T12:00:00-05:00","gmt_time_start":"2020-12-03 16:00:00","gmt_time_end":"2020-12-03 17:00:00","gmt_time_end_last":"2020-12-03 17:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"hg_media":{"641287":{"id":"641287","type":"image","title":"Sarah Aarons","body":null,"created":"1605274585","gmt_created":"2020-11-13 13:36:25","changed":"1605274585","gmt_changed":"2020-11-13 13:36:25","alt":"","file":{"fid":"243694","name":"Sarah Aarons.jpg","image_path":"\/sites\/default\/files\/images\/Sarah%20Aarons.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/images\/Sarah%20Aarons.jpg","mime":"image\/jpeg","size":4324,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/Sarah%20Aarons.jpg?itok=uigkxvGv"}}},"media_ids":["641287"],"groups":[{"id":"364801","name":"School of Earth and Atmospheric Sciences (EAS)"}],"categories":[],"keywords":[{"id":"175623","name":"EAS Seminar"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"177814","name":"Postdoc"},{"id":"174045","name":"Graduate students"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EDr. Kim Cobb, Dr. Karl Lang\u003C\/p\u003E\r\n","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}