{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25639"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25639","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Warm and cold atmospheric frontogenesis","abstract":"Various differences and similarities of warm and cold frontogenesis are numerically modeled. The hydrostatic, adiabatic, Boussinesq primitive equations are integrated on a two dimensional grid. The frontogenesis is forced by an a1ong·front gradient of potential temperature and by a vertically sheared cross-front wind field. The model develops fronts with the proper vertical circulations, strengths and slopes; more positive relative vorticity is produced than negative relative vorticity and the frontal zone at the surface develops in a zone of convergence. Model results indicate that cold fronts will propagate faster than warm fronts and that the fronts will develop on the time scale of 1-3 days. Linearization of the model demonstrates the significance of the nonlinear effects when the results are compared with the nonlinear model. Nonlinear advections brake the frontogenesis for cold fronts in the model, and are almost entirely responsible for realistic frontogenesis of warm fronts. conceptual models of both warm and cold frontogenesis are developed which clarify the origin of the vertical circulation and some of the frontogenetic processes. An Ekman boundary layer is included in some integrations to crudely simulate some boundary layer effects. The convergence within positive relative vorticity regions enhanced the frontogenesis within the boundary layer.","abstract_html":"Various differences and similarities of warm and cold frontogenesis are numerically modeled. The hydrostatic, adiabatic, Boussinesq primitive equations are integrated on a two dimensional grid. The frontogenesis is forced by an a1ong·front gradient of potential temperature and by a vertically sheared cross-front wind field. The model develops fronts with the proper vertical circulations, strengths and slopes; more positive relative vorticity is produced than negative relative vorticity and the frontal zone at the surface develops in a zone of convergence. Model results indicate that cold fronts will propagate faster than warm fronts and that the fronts will develop on the time scale of 1-3 days. Linearization of the model demonstrates the significance of the nonlinear effects when the results are compared with the nonlinear model. Nonlinear advections brake the frontogenesis for cold fronts in the model, and are almost entirely responsible for realistic frontogenesis of warm fronts. conceptual models of both warm and cold frontogenesis are developed which clarify the origin of the vertical circulation and some of the frontogenetic processes. An Ekman boundary layer is included in some integrations to crudely simulate some boundary layer effects. The convergence within positive relative vorticity regions enhanced the frontogenesis within the boundary layer.","abstract_has_math":false,"creators":["Gidel, Louis Thomas"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Geller, M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-07-05T14:49:22Z","date_published":"2011-07-05T14:49:22Z","updated_at":"2026-07-22T22:25:24Z","subjects":["frontogenesis","warm and cold frontogenesis","atmospheric frontogenesis","Boussinesq primitive equations"],"languages":["en"],"rights":["1977 Louis Thomas Gidel"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["2786760"],"render_values":[{"text":"2786760","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25639","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Geller, M."]},{"key":"dc:creator","label":"Author","values":["Gidel, Louis Thomas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-07-05T14:49:22Z","10000-01-01","1977"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["frontogenesis","warm and cold frontogenesis","atmospheric frontogenesis","Boussinesq primitive equations"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1977 Louis Thomas Gidel"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["2786760","http://hdl.handle.net/2142/25639"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Various differences and similarities of warm and cold frontogenesis are numerically modeled. The hydrostatic, adiabatic, Boussinesq primitive equations are integrated on a two dimensional grid. The frontogenesis is forced by an a1ong·front gradient of potential temperature and by a vertically sheared cross-front wind field. The model develops fronts with the proper vertical circulations, strengths and slopes; more positive relative vorticity is produced than negative relative vorticity and the frontal zone at the surface develops in a zone of convergence. Model results indicate that cold fronts will propagate faster than warm fronts and that the fronts will develop on the time scale of 1-3 days. Linearization of the model demonstrates the significance of the nonlinear effects when the results are compared with the nonlinear model. Nonlinear advections brake the frontogenesis for cold fronts in the model, and are almost entirely responsible for realistic frontogenesis of warm fronts. conceptual models of both warm and cold frontogenesis are developed which clarify the origin of the vertical circulation and some of the frontogenetic processes. An Ekman boundary layer is included in some integrations to crudely simulate some boundary layer effects. The convergence within positive relative vorticity regions enhanced the frontogenesis within the boundary layer.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-05T14:49:22Z No. of bitstreams: 1 1977_gidel.pdf: 6037969 bytes, checksum: 168074bf02a27b162c33a733c2654a46 (MD5)","Made available in DSpace on 2011-07-05T14:49:22Z (GMT). No. of bitstreams: 1 1977_gidel.pdf: 6037969 bytes, checksum: 168074bf02a27b162c33a733c2654a46 (MD5) Previous issue date: 1977","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-05T14:49:22Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:32-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Warm and cold atmospheric frontogenesis"]}]}],"canonical_facts":{"dc:contributor":["Geller, M."],"dc:creator":["Gidel, Louis Thomas"],"dc:date":["2011-07-05T14:49:22Z","10000-01-01","1977"],"dc:description":["Various differences and similarities of warm and cold frontogenesis are numerically modeled. The hydrostatic, adiabatic, Boussinesq primitive equations are integrated on a two dimensional grid. The frontogenesis is forced by an a1ong·front gradient of potential temperature and by a vertically sheared cross-front wind field. The model develops fronts with the proper vertical circulations, strengths and slopes; more positive relative vorticity is produced than negative relative vorticity and the frontal zone at the surface develops in a zone of convergence. Model results indicate that cold fronts will propagate faster than warm fronts and that the fronts will develop on the time scale of 1-3 days. Linearization of the model demonstrates the significance of the nonlinear effects when the results are compared with the nonlinear model. Nonlinear advections brake the frontogenesis for cold fronts in the model, and are almost entirely responsible for realistic frontogenesis of warm fronts. conceptual models of both warm and cold frontogenesis are developed which clarify the origin of the vertical circulation and some of the frontogenetic processes. An Ekman boundary layer is included in some integrations to crudely simulate some boundary layer effects. The convergence within positive relative vorticity regions enhanced the frontogenesis within the boundary layer.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-05T14:49:22Z No. of bitstreams: 1 1977_gidel.pdf: 6037969 bytes, checksum: 168074bf02a27b162c33a733c2654a46 (MD5)","Made available in DSpace on 2011-07-05T14:49:22Z (GMT). No. of bitstreams: 1 1977_gidel.pdf: 6037969 bytes, checksum: 168074bf02a27b162c33a733c2654a46 (MD5) Previous issue date: 1977","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-05T14:49:22Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:32-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["2786760","http://hdl.handle.net/2142/25639"],"dc:language":["en"],"dc:rights":["1977 Louis Thomas Gidel"],"dc:subject":["frontogenesis","warm and cold frontogenesis","atmospheric frontogenesis","Boussinesq primitive equations"],"dc:title":["Warm and cold atmospheric frontogenesis"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:24Z"}