{"623719":{"#nid":"623719","#data":{"type":"event","title":"Is the Net Cloud Radiative Effect Constrained to be Uniform Over the Tropical Warm Pools?","body":[{"value":"\u003Ch4\u003E\u003Cstrong\u003EThe School of Earth and Atmospheric Sciences Presents Dr. Casey Wall, University California San Diego\u003C\/strong\u003E\u003C\/h4\u003E\r\n\r\n\u003Cp\u003EIs the Net Cloud Radiative Effect Constrained to be Uniform Over the Tropical Warm Pools?\u003C\/p\u003E\r\n\r\n\u003Cdiv\u003E\r\n\u003Cp\u003EIt has long been observed that the top-of-atmosphere net radiation is about the same in convective and adjacent non-convective regions over the tropical warm pools, despite the fact that the albedo and greenhouse effect of deep-convective clouds are both large. Why this occurs is unknown, but one hypothesis suggests that deep-convective clouds shade the ocean from insolation and thereby mutually interact with sea surface temperature gradients and atmospheric circulation.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EIt is posited that this interaction, which I call the \u0026ldquo;cloud shading feedback,\u0026rdquo; could constrain the top-of-atmosphere radiation balance and maintain similar net radiation in convective and adjacent non-convective regions. I investigate this hypothesis using satellite data and climate model experiments.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EEvidence of the cloud shading feedback from a combination of geosynchronous\u0026nbsp;and polar-orbiting satellite data is presented, and then idealized climate model simulations are used to investigate if the cloud shading feedback constrains the top-of-atmosphere radiation balance. A control experiment is performed in which convective clouds interact naturally with the ocean and atmosphere by forming over the warmest water and shading it, and a mechanism-denial experiment is performed in which the cloud shading feedback is removed by randomizing cloud shading of the ocean.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ERemoving the cloud shading feedback brightens convective clouds and enhances the contrast in top-of-atmosphere net radiation between convective and non-convective regions in the tropics. The results support the hypothesis that feedbacks between sea surface temperature and convection are critical to obtaining similar top-of-atmosphere net radiation in convective and adjacent non-convective regions over the tropical warm pools.\u0026nbsp;\u003C\/p\u003E\r\n\u003C\/div\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"A seminar by Dr. Casey Wall, School of Earth and Atmospheric Sciences"}],"uid":"34458","created_gmt":"2019-07-26 14:41:22","changed_gmt":"2019-08-20 13:46:27","author":"nlawson3","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2019-09-12T12:00:00-04:00","event_time_end":"2019-09-12T12:50:00-04:00","event_time_end_last":"2019-09-12T12:50:00-04:00","gmt_time_start":"2019-09-12 16:00:00","gmt_time_end":"2019-09-12 16:50:00","gmt_time_end_last":"2019-09-12 16:50:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"hg_media":{"623712":{"id":"623712","type":"image","title":"Casey Wall","body":null,"created":"1564149545","gmt_created":"2019-07-26 13:59:05","changed":"1564149545","gmt_changed":"2019-07-26 13:59:05","alt":"","file":{"fid":"237557","name":"casey-wall-175.jpg","image_path":"\/sites\/default\/files\/images\/casey-wall-175.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/images\/casey-wall-175.jpg","mime":"image\/jpeg","size":60306,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/casey-wall-175.jpg?itok=7B0kE170"}}},"media_ids":["623712"],"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\u003EJie He\u003C\/p\u003E\r\n","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}