Granger causality of the local Hadley cell and large-scale cloud cover over South Africa
This study demonstrates that Hadley cell dynamics could be used as a proxy to determine cloud cover and thus solar energy potential over South Africa. Granger causality was used to investigate causal interactions between the Hadley cell and cloud cover for the period 1980–2015, and such links were e...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Academy of Science of South Africa
2019-09-01
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| Series: | South African Journal of Science |
| Subjects: | |
| Online Access: | https://www.sajs.co.za/article/view/5724 |
| _version_ | 1811304199670988800 |
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| author | Dawn D. Mahlobo Thando Ndarana Stefan W. Grab Francois Engelbrecht |
| author_facet | Dawn D. Mahlobo Thando Ndarana Stefan W. Grab Francois Engelbrecht |
| author_sort | Dawn D. Mahlobo |
| collection | DOAJ |
| description | This study demonstrates that Hadley cell dynamics could be used as a proxy to determine cloud cover and thus solar energy potential over South Africa. Granger causality was used to investigate causal interactions between the Hadley cell and cloud cover for the period 1980–2015, and such links were established. Areas of strong causality are found over the northwestern parts of South Africa. Moreover, weak causality from cloud cover to the Hadley cell does exist, with vertical velocity being the main variable responsible for this causality, which hence indirectly links cloud cover to Hadley cell causality.
Significance:
• Hadley cell dynamics may be used to identify regions of cloudlessness over South Africa.
• Hadley cell dynamics may further be used as a proxy for cloud cover towards understanding the solar energy potential in South Africa within the context of climate variability and change. |
| first_indexed | 2024-04-13T08:02:49Z |
| format | Article |
| id | doaj.art-d87eff3fbd144d99a7a43b80e9a8952d |
| institution | Directory Open Access Journal |
| issn | 1996-7489 |
| language | English |
| last_indexed | 2024-04-13T08:02:49Z |
| publishDate | 2019-09-01 |
| publisher | Academy of Science of South Africa |
| record_format | Article |
| series | South African Journal of Science |
| spelling | doaj.art-d87eff3fbd144d99a7a43b80e9a8952d2022-12-22T02:55:15ZengAcademy of Science of South AfricaSouth African Journal of Science1996-74892019-09-011159/1010.17159/sajs.2019/57245724Granger causality of the local Hadley cell and large-scale cloud cover over South AfricaDawn D. Mahlobo0Thando Ndarana1Stefan W. Grab2Francois Engelbrecht3School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, South AfricaDepartment of Geography, Geoinformatics and Meteorology, University of Pretoria, Pretoria, South AfricaSchool of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, South AfricaGlobal Change Institute, University of the Witwatersrand, Johannesburg, South AfricaThis study demonstrates that Hadley cell dynamics could be used as a proxy to determine cloud cover and thus solar energy potential over South Africa. Granger causality was used to investigate causal interactions between the Hadley cell and cloud cover for the period 1980–2015, and such links were established. Areas of strong causality are found over the northwestern parts of South Africa. Moreover, weak causality from cloud cover to the Hadley cell does exist, with vertical velocity being the main variable responsible for this causality, which hence indirectly links cloud cover to Hadley cell causality. Significance: • Hadley cell dynamics may be used to identify regions of cloudlessness over South Africa. • Hadley cell dynamics may further be used as a proxy for cloud cover towards understanding the solar energy potential in South Africa within the context of climate variability and change.https://www.sajs.co.za/article/view/5724Hadley circulationmass fluxtotal cloud coversolar energy potential |
| spellingShingle | Dawn D. Mahlobo Thando Ndarana Stefan W. Grab Francois Engelbrecht Granger causality of the local Hadley cell and large-scale cloud cover over South Africa South African Journal of Science Hadley circulation mass flux total cloud cover solar energy potential |
| title | Granger causality of the local Hadley cell and large-scale cloud cover over South Africa |
| title_full | Granger causality of the local Hadley cell and large-scale cloud cover over South Africa |
| title_fullStr | Granger causality of the local Hadley cell and large-scale cloud cover over South Africa |
| title_full_unstemmed | Granger causality of the local Hadley cell and large-scale cloud cover over South Africa |
| title_short | Granger causality of the local Hadley cell and large-scale cloud cover over South Africa |
| title_sort | granger causality of the local hadley cell and large scale cloud cover over south africa |
| topic | Hadley circulation mass flux total cloud cover solar energy potential |
| url | https://www.sajs.co.za/article/view/5724 |
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