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The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar
Chlorophyll-a concentration is a measure of phytoplankton biomass and is therefore used as a proxy for primary production. The chlorophyll bloom occurring in the South western Indian Ocean is one of the major blooms in the open ocean and is subject to controversies about its formation, propagation a...
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| Format: | Thesis |
| Language: | English |
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Marine Research (MA-RE) Institute
2015
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| _version_ | 1867613190849822721 |
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| access_status_str | Open Access |
| author | Oozeeraully, Yuneeda Bibi Naheed |
| author2 | Reason, Chris |
| author_browse | Oozeeraully, Yuneeda Bibi Naheed Reason, Chris |
| author_facet | Reason, Chris Oozeeraully, Yuneeda Bibi Naheed |
| author_sort | Oozeeraully, Yuneeda Bibi Naheed |
| collection | Thesis |
| description | Chlorophyll-a concentration is a measure of phytoplankton biomass and is therefore used as a proxy for primary production. The chlorophyll bloom occurring in the South western Indian Ocean is one of the major blooms in the open ocean and is subject to controversies about its formation, propagation and termination mechanisms. In this study, the region was divided into two sub-regions, the South East region (48°E-66°E, 24°S-30°S) and the East region (70°E-88°E, 24°S-30°S) and satellite datasets of chlorophyll-a, sea surface temperature, wind speed and direction and sea surface height were analysed. A bloom was characterized by twice the mean level of the sub-region (~0.08mg/m3) and three bloom years were identified: 2004, 2006 and 2008. The timing, propagation and termination of the bloom showed spatial and temporal variability. The wavelet analysis revealed a semi-annual signal for 2006 and 2008 and an annual one in 2004 due to the gradual decline in the concentration of chlorophyll-a. The transport of the bloom is affected by the passage of eddies where the concentration of chlorophyll-a is higher in the core and around the edges in cyclonic and anticyclonic eddies respectively. The bloom could be present at the sub-surface level throughout the years but is only apparent at the surface during specific years. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/15686 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:13.078Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Marine Research (MA-RE) Institute |
| publisherStr | Marine Research (MA-RE) Institute |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/15686 The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar Oozeeraully, Yuneeda Bibi Naheed Reason, Chris Hermes, Juliet C Collins, Charine Applied Marine Science Chlorophyll-a concentration is a measure of phytoplankton biomass and is therefore used as a proxy for primary production. The chlorophyll bloom occurring in the South western Indian Ocean is one of the major blooms in the open ocean and is subject to controversies about its formation, propagation and termination mechanisms. In this study, the region was divided into two sub-regions, the South East region (48°E-66°E, 24°S-30°S) and the East region (70°E-88°E, 24°S-30°S) and satellite datasets of chlorophyll-a, sea surface temperature, wind speed and direction and sea surface height were analysed. A bloom was characterized by twice the mean level of the sub-region (~0.08mg/m3) and three bloom years were identified: 2004, 2006 and 2008. The timing, propagation and termination of the bloom showed spatial and temporal variability. The wavelet analysis revealed a semi-annual signal for 2006 and 2008 and an annual one in 2004 due to the gradual decline in the concentration of chlorophyll-a. The transport of the bloom is affected by the passage of eddies where the concentration of chlorophyll-a is higher in the core and around the edges in cyclonic and anticyclonic eddies respectively. The bloom could be present at the sub-surface level throughout the years but is only apparent at the surface during specific years. 2015-12-08T11:41:44Z 2015-12-08T11:41:44Z 2015 Master Thesis Masters MSc http://hdl.handle.net/11427/15686 eng application/pdf Marine Research (MA-RE) Institute Faculty of Science University of Cape Town |
| spellingShingle | Applied Marine Science Oozeeraully, Yuneeda Bibi Naheed The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar |
| thesis_degree_str | Master's |
| title | The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar |
| title_full | The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar |
| title_fullStr | The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar |
| title_full_unstemmed | The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar |
| title_short | The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar |
| title_sort | inter annual variability in the onset of the enhanced chlorophyll a east of madagascar |
| topic | Applied Marine Science |
| url | http://hdl.handle.net/11427/15686 |
| work_keys_str_mv | AT oozeeraullyyuneedabibinaheed theinterannualvariabilityintheonsetoftheenhancedchlorophyllaeastofmadagascar AT oozeeraullyyuneedabibinaheed interannualvariabilityintheonsetoftheenhancedchlorophyllaeastofmadagascar |