{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/29479"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/29479","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"A numerical model study about the impacts of dry air on tropical cyclone formation","abstract":"The impacts of dry air on tropical cyclone formation are examined in the numerical model simulations of ex-Gaston (2010) and pre-Fay (2008). The former can be regarded as a non-developing system as it failed to redevelop after being downgraded into a remnant low, and the latter developed into a tropical cyclone despite lateral dry air entrainment and transient upper-level dry air intrusion. Backward trajectory analysis and water budget analysis show that vertical transport of dry air from the upper troposphere, where a well-defined wave pouch is absent, contributes to mid-level drying near the pouch center and the non-development of ex-Gaston. Water vapor budget analysis at the pre-genesis stage shows that vertical moisture advection plays the dominant role in moistening the free atmosphere. Persistent mid-level drying is shown to suppress deep convection and reduce moisture supply to the free atmosphere. Three-dimensional trajectory analysis based on the numerical simulation of Fay suggests that dry air entrained at the pouch periphery does not penetrate to the pouch center due to the weak mid-level inflow. Moreover, it is shown that dry air gets moistened as it is being wrapped into the wave pouch, and lateral entrainment in the middle troposphere thus does not suppress convection near the pouch center or prevent development of tropical storm Fay.","abstract_html":"The impacts of dry air on tropical cyclone formation are examined in the numerical model simulations of ex-Gaston (2010) and pre-Fay (2008). The former can be regarded as a non-developing system as it failed to redevelop after being downgraded into a remnant low, and the latter developed into a tropical cyclone despite lateral dry air entrainment and transient upper-level dry air intrusion. Backward trajectory analysis and water budget analysis show that vertical transport of dry air from the upper troposphere, where a well-defined wave pouch is absent, contributes to mid-level drying near the pouch center and the non-development of ex-Gaston. Water vapor budget analysis at the pre-genesis stage shows that vertical moisture advection plays the dominant role in moistening the free atmosphere. Persistent mid-level drying is shown to suppress deep convection and reduce moisture supply to the free atmosphere. Three-dimensional trajectory analysis based on the numerical simulation of Fay suggests that dry air entrained at the pouch periphery does not penetrate to the pouch center due to the weak mid-level inflow. Moreover, it is shown that dry air gets moistened as it is being wrapped into the wave pouch, and lateral entrainment in the middle troposphere thus does not suppress convection near the pouch center or prevent development of tropical storm Fay.","abstract_has_math":false,"creators":["Fritz, Cody"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Atmospheric Sciences","degree_department":null,"school":null,"contributors":["Wang, Zhuo"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-02-01T00:48:29Z","date_published":"2012-02-01T00:48:29Z","updated_at":"2026-07-22T22:25:27Z","subjects":["tropical cyclone","dry air impacts","pre-genesis"],"languages":["en"],"rights":["Copyright 2011 Cody L. Fritz"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/29479","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wang, Zhuo"]},{"key":"dc:creator","label":"Author","values":["Fritz, Cody"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-02-01T00:48:29Z","2014-02-01T11:00:30Z","2011-12"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Atmospheric Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["tropical cyclone","dry air impacts","pre-genesis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2011 Cody L. Fritz"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/29479"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The impacts of dry air on tropical cyclone formation are examined in the numerical model simulations of ex-Gaston (2010) and pre-Fay (2008). The former can be regarded as a non-developing system as it failed to redevelop after being downgraded into a remnant low, and the latter developed into a tropical cyclone despite lateral dry air entrainment and transient upper-level dry air intrusion. Backward trajectory analysis and water budget analysis show that vertical transport of dry air from the upper troposphere, where a well-defined wave pouch is absent, contributes to mid-level drying near the pouch center and the non-development of ex-Gaston. Water vapor budget analysis at the pre-genesis stage shows that vertical moisture advection plays the dominant role in moistening the free atmosphere. Persistent mid-level drying is shown to suppress deep convection and reduce moisture supply to the free atmosphere. Three-dimensional trajectory analysis based on the numerical simulation of Fay suggests that dry air entrained at the pouch periphery does not penetrate to the pouch center due to the weak mid-level inflow. Moreover, it is shown that dry air gets moistened as it is being wrapped into the wave pouch, and lateral entrainment in the middle troposphere thus does not suppress convection near the pouch center or prevent development of tropical storm Fay.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-12-06T20:46:54Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Fritz_Cody.pdf: 4014335 bytes, checksum: fb2aa85715edc53b96c9738aa0ffc7f2 (MD5)","Made available in DSpace on 2012-02-01T00:48:29Z (GMT). No. of bitstreams: 2 Fritz_Cody.pdf: 4014152 bytes, checksum: b0f384e30b6f7cbd008721809a6742bc (MD5) license.txt: 4058 bytes, checksum: ce2047b4059367b1fdb2e5f082489921 (MD5)","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2012-02-01T00:50:40Z Item is restricted until 2014-02-01T00:50:07Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:30Z Item was in collections: Dissertations and Theses - Atmospheric Sciences (ID: 694) Graduate Theses and Dissertations at Illinois (ID: 204) No. of bitstreams: 2 Fritz_Cody.pdf: 4014152 bytes, checksum: b0f384e30b6f7cbd008721809a6742bc (MD5) license.txt: 4058 bytes, checksum: ce2047b4059367b1fdb2e5f082489921 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:30Z"]},{"key":"dc:title","label":"Title","values":["A numerical model study about the impacts of dry air on tropical cyclone formation"]}]}],"canonical_facts":{"dc:contributor":["Wang, Zhuo"],"dc:creator":["Fritz, Cody"],"dc:date":["2012-02-01T00:48:29Z","2014-02-01T11:00:30Z","2011-12"],"dc:description":["The impacts of dry air on tropical cyclone formation are examined in the numerical model simulations of ex-Gaston (2010) and pre-Fay (2008). The former can be regarded as a non-developing system as it failed to redevelop after being downgraded into a remnant low, and the latter developed into a tropical cyclone despite lateral dry air entrainment and transient upper-level dry air intrusion. Backward trajectory analysis and water budget analysis show that vertical transport of dry air from the upper troposphere, where a well-defined wave pouch is absent, contributes to mid-level drying near the pouch center and the non-development of ex-Gaston. Water vapor budget analysis at the pre-genesis stage shows that vertical moisture advection plays the dominant role in moistening the free atmosphere. Persistent mid-level drying is shown to suppress deep convection and reduce moisture supply to the free atmosphere. Three-dimensional trajectory analysis based on the numerical simulation of Fay suggests that dry air entrained at the pouch periphery does not penetrate to the pouch center due to the weak mid-level inflow. Moreover, it is shown that dry air gets moistened as it is being wrapped into the wave pouch, and lateral entrainment in the middle troposphere thus does not suppress convection near the pouch center or prevent development of tropical storm Fay.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-12-06T20:46:54Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Fritz_Cody.pdf: 4014335 bytes, checksum: fb2aa85715edc53b96c9738aa0ffc7f2 (MD5)","Made available in DSpace on 2012-02-01T00:48:29Z (GMT). No. of bitstreams: 2 Fritz_Cody.pdf: 4014152 bytes, checksum: b0f384e30b6f7cbd008721809a6742bc (MD5) license.txt: 4058 bytes, checksum: ce2047b4059367b1fdb2e5f082489921 (MD5)","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2012-02-01T00:50:40Z Item is restricted until 2014-02-01T00:50:07Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:30Z Item was in collections: Dissertations and Theses - Atmospheric Sciences (ID: 694) Graduate Theses and Dissertations at Illinois (ID: 204) No. of bitstreams: 2 Fritz_Cody.pdf: 4014152 bytes, checksum: b0f384e30b6f7cbd008721809a6742bc (MD5) license.txt: 4058 bytes, checksum: ce2047b4059367b1fdb2e5f082489921 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:30Z"],"dc:identifier":["http://hdl.handle.net/2142/29479"],"dc:language":["en"],"dc:rights":["Copyright 2011 Cody L. Fritz"],"dc:subject":["tropical cyclone","dry air impacts","pre-genesis"],"dc:title":["A numerical model study about the impacts of dry air on tropical cyclone formation"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Atmospheric Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:27Z"}