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Composite structure of tropical cyclones in the SW Indian Ocean
This work examines SW Indian Ocean tropical cyclone (TC) structure as a function of movement using ECMWF gridded data. Analyses of the mean summer climate for the period 1987 1992 shown that conditions conducive to the development ofTCs are present between the latitudes 5° and 15°S. Six westward mo...
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| Format: | Thesis |
| Language: | English |
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Department of Oceanography
2016
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| _version_ | 1867613231379382272 |
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| access_status_str | Open Access |
| author | Parker, Bhawoodien Abbasmia |
| author2 | Jury, Mark R |
| author_browse | Jury, Mark R Parker, Bhawoodien Abbasmia |
| author_facet | Jury, Mark R Parker, Bhawoodien Abbasmia |
| author_sort | Parker, Bhawoodien Abbasmia |
| collection | Thesis |
| description | This work examines SW Indian Ocean tropical cyclone (TC) structure as a function of movement using ECMWF gridded data. Analyses of the mean summer climate for the period 1987 1992 shown that conditions conducive to the development ofTCs are present between the latitudes 5° and 15°S. Six westward moving TCs are selected to form the westward moving composite TC and four are used in the recurving TC composite from 3-days before the maximum surface intensity to 1 day after. The westward moving composite was found to have a steady TC signature. Comparisons were made with TC Firinga which passed near Mauritius on 29 January 1989. The recurving TC composite was found to exhibit rapid growth with sharp parameters tendencies. Interaction with a sub tropical trough is seen in both TC composites. Upper level westerly winds create effective uplift which strengthens the recurving TC on the poleward side. Spectral analysis of a rainfall index compiled from Mauritius data demonstrates spectral peaks at the seasonal and intra-seasonal scale. Three peaks were identified. one within the 40-60 day Madden Julian Oscillation. one at 23 days and one with a 16 day oscillation. The 23 day oscillation was found to have a highest spectral power. The results of TC and rainfall analyses offer useful insights to the climate and weather of the SW Indian Ocean. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/19524 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:51.499Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Oceanography |
| publisherStr | Department of Oceanography |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/19524 Composite structure of tropical cyclones in the SW Indian Ocean Parker, Bhawoodien Abbasmia Jury, Mark R Oceanography This work examines SW Indian Ocean tropical cyclone (TC) structure as a function of movement using ECMWF gridded data. Analyses of the mean summer climate for the period 1987 1992 shown that conditions conducive to the development ofTCs are present between the latitudes 5° and 15°S. Six westward moving TCs are selected to form the westward moving composite TC and four are used in the recurving TC composite from 3-days before the maximum surface intensity to 1 day after. The westward moving composite was found to have a steady TC signature. Comparisons were made with TC Firinga which passed near Mauritius on 29 January 1989. The recurving TC composite was found to exhibit rapid growth with sharp parameters tendencies. Interaction with a sub tropical trough is seen in both TC composites. Upper level westerly winds create effective uplift which strengthens the recurving TC on the poleward side. Spectral analysis of a rainfall index compiled from Mauritius data demonstrates spectral peaks at the seasonal and intra-seasonal scale. Three peaks were identified. one within the 40-60 day Madden Julian Oscillation. one at 23 days and one with a 16 day oscillation. The 23 day oscillation was found to have a highest spectral power. The results of TC and rainfall analyses offer useful insights to the climate and weather of the SW Indian Ocean. 2016-05-09T09:03:07Z 2016-05-09T09:03:07Z 1994 Master Thesis Masters MSc http://hdl.handle.net/11427/19524 eng application/pdf Department of Oceanography Faculty of Science University of Cape Town |
| spellingShingle | Oceanography Parker, Bhawoodien Abbasmia Composite structure of tropical cyclones in the SW Indian Ocean |
| thesis_degree_str | Master's |
| title | Composite structure of tropical cyclones in the SW Indian Ocean |
| title_full | Composite structure of tropical cyclones in the SW Indian Ocean |
| title_fullStr | Composite structure of tropical cyclones in the SW Indian Ocean |
| title_full_unstemmed | Composite structure of tropical cyclones in the SW Indian Ocean |
| title_short | Composite structure of tropical cyclones in the SW Indian Ocean |
| title_sort | composite structure of tropical cyclones in the sw indian ocean |
| topic | Oceanography |
| url | http://hdl.handle.net/11427/19524 |
| work_keys_str_mv | AT parkerbhawoodienabbasmia compositestructureoftropicalcyclonesintheswindianocean |