{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/70922"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/70922","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Observational Studies of Wave Disturbances in the Tropical Pacific and Their Relationship With Deep Cloud Activity (Global Atmospheric Research Program(garp), Fgge, Gate, Itcz, Spcz, Sst)","abstract":"First GARP (Global Atmospheric Research Program) Global Experiment, Level III-b data and the outgoing longwave radiation data are used to investigate relationships between deep cloud activity and large-scale meteorological fields from May to September in 1979. Discussion is focused on the situations in the eastern Pacific for the following reasons: (a) this is the area where strong deep convection frequently develops in the northern summer, (b) it is also an area which has been least explored meteorologically.","abstract_html":"First GARP (Global Atmospheric Research Program) Global Experiment, Level III-b data and the outgoing longwave radiation data are used to investigate relationships between deep cloud activity and large-scale meteorological fields from May to September in 1979. Discussion is focused on the situations in the eastern Pacific for the following reasons: (a) this is the area where strong deep convection frequently develops in the northern summer, (b) it is also an area which has been least explored meteorologically.","abstract_has_math":false,"creators":["Tai, King-Sheng"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Atmospheric Sciences","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-16T04:22:11Z","date_published":"2014-12-16T04:22:11Z","updated_at":"2026-07-22T22:26:03Z","subjects":["Physics, Atmospheric Science"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8600329"],"render_values":[{"text":"(UMI)AAI8600329","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/70922","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Tai, King-Sheng"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-16T04:22:11Z","10000-01-01","1985"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Atmospheric Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"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":["Physics, Atmospheric Science"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/70922","(UMI)AAI8600329"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["First GARP (Global Atmospheric Research Program) Global Experiment, Level III-b data and the outgoing longwave radiation data are used to investigate relationships between deep cloud activity and large-scale meteorological fields from May to September in 1979. Discussion is focused on the situations in the eastern Pacific for the following reasons: (a) this is the area where strong deep convection frequently develops in the northern summer, (b) it is also an area which has been least explored meteorologically.","The monthly mean flow in July and August at 1000 mb show that the surface confluence line extends in the zone of 7-12(DEGREES)N in the eastern Pacific. The areas of convergence at 1000 mb coincide with those of the Intertropical Convergence Zone (ITCZ) and the South Pacific Convergence Zone (SPCZ). The axis of the strongest deep cloud activity is colocated with the surface confluence line and their location suggest the close relationship between sea surface temperature, the ITCZ and the surface wind confluence. At 850 mb and 700 mb, easterly flow dominated most of the tropical Pacific. While, its weak latitudinal and vertical shears suggest that dry barotropic instability alone cannot account for the formation of easterly waves in the eastern Pacific.","A power spectrum analysis using Maximum Entropy Method is made for the meridional wind component at 850 mb from May through August. The waves with a period of 4-6 days are stronger in July and August than in other months, also they are active in the regions of 100-130(DEGREES)E and 130-160(DEGREES)E within the zone of 5-15(DEGREES)N. A cross-spectrum analysis between the deep cloud activity and the meridional wind indicates that deep convection occurs at or slightly behind the wave trough axis.","The structure of easterly waves, obtained by a composite technique is similar to those of African waves observed in GATE (GARP Atlantic Tropical Experiment) Phase III and easterly waves in the western Pacific determined by Reed and Recker (1971). The position of the surface confluence line shifts latitudinally with the passage of a wave is remarkably similar to that found in GATE Phase III. However, the structure in the upper level does not show distinct secondary maxima of the wave-related perturbations, which is significant with the easterly waves observed in both Africa and western Pacific.","Made available in DSpace on 2014-12-16T04:22:11Z (GMT). No. of bitstreams: 1 8600329.pdf: 7487688 bytes, checksum: d14de34db9aedd21cf74e420b0de9c83 (MD5) Previous issue date: 1985","Embargo set by: Seth Robbins for item 71088 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","240 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985."]},{"key":"dc:title","label":"Title","values":["Observational Studies of Wave Disturbances in the Tropical Pacific and Their Relationship With Deep Cloud Activity (Global Atmospheric Research Program(garp), Fgge, Gate, Itcz, Spcz, Sst)"]}]}],"canonical_facts":{"dc:creator":["Tai, King-Sheng"],"dc:date":["2014-12-16T04:22:11Z","10000-01-01","1985"],"dc:description":["First GARP (Global Atmospheric Research Program) Global Experiment, Level III-b data and the outgoing longwave radiation data are used to investigate relationships between deep cloud activity and large-scale meteorological fields from May to September in 1979. Discussion is focused on the situations in the eastern Pacific for the following reasons: (a) this is the area where strong deep convection frequently develops in the northern summer, (b) it is also an area which has been least explored meteorologically.","The monthly mean flow in July and August at 1000 mb show that the surface confluence line extends in the zone of 7-12(DEGREES)N in the eastern Pacific. The areas of convergence at 1000 mb coincide with those of the Intertropical Convergence Zone (ITCZ) and the South Pacific Convergence Zone (SPCZ). The axis of the strongest deep cloud activity is colocated with the surface confluence line and their location suggest the close relationship between sea surface temperature, the ITCZ and the surface wind confluence. At 850 mb and 700 mb, easterly flow dominated most of the tropical Pacific. While, its weak latitudinal and vertical shears suggest that dry barotropic instability alone cannot account for the formation of easterly waves in the eastern Pacific.","A power spectrum analysis using Maximum Entropy Method is made for the meridional wind component at 850 mb from May through August. The waves with a period of 4-6 days are stronger in July and August than in other months, also they are active in the regions of 100-130(DEGREES)E and 130-160(DEGREES)E within the zone of 5-15(DEGREES)N. A cross-spectrum analysis between the deep cloud activity and the meridional wind indicates that deep convection occurs at or slightly behind the wave trough axis.","The structure of easterly waves, obtained by a composite technique is similar to those of African waves observed in GATE (GARP Atlantic Tropical Experiment) Phase III and easterly waves in the western Pacific determined by Reed and Recker (1971). The position of the surface confluence line shifts latitudinally with the passage of a wave is remarkably similar to that found in GATE Phase III. However, the structure in the upper level does not show distinct secondary maxima of the wave-related perturbations, which is significant with the easterly waves observed in both Africa and western Pacific.","Made available in DSpace on 2014-12-16T04:22:11Z (GMT). No. of bitstreams: 1 8600329.pdf: 7487688 bytes, checksum: d14de34db9aedd21cf74e420b0de9c83 (MD5) Previous issue date: 1985","Embargo set by: Seth Robbins for item 71088 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","240 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985."],"dc:identifier":["http://hdl.handle.net/2142/70922","(UMI)AAI8600329"],"dc:subject":["Physics, Atmospheric Science"],"dc:title":["Observational Studies of Wave Disturbances in the Tropical Pacific and Their Relationship With Deep Cloud Activity (Global Atmospheric Research Program(garp), Fgge, Gate, Itcz, Spcz, Sst)"],"dc:type":["text"],"thesis:degree_discipline":["Atmospheric Sciences"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:03Z"}