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Atmospheric boundary layer characterizations over Highveld Region South Africa
Dissertation (MSc)--University of Pretoria, 2013.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613453852606464 |
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| access_status_str | Open Access |
| author2 | Djolov, George D. |
| author_browse | Djolov, George D. |
| author_facet | Djolov, George D. |
| collection | Thesis |
| dc_rights_str_mv | © 2013 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria |
| description | Dissertation (MSc)--University of Pretoria, 2013. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/24754 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:23.737Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/24754 Atmospheric boundary layer characterizations over Highveld Region South Africa Djolov, George D. philuhunga@yahoo.com Venkataraman, Sivakumar Luhunga, P.M. (Philbert Modest) Statistical data analysis Lidar Air-land interactions Micro-meteorology Atmospheric boundary layer UCTD Dissertation (MSc)--University of Pretoria, 2013. Atmospheric Boundary Layer (ABL) characteristics can be highly complex; the links between spatial and temporal variability of ABL meteorological quantities and existing land use patterns are still poorly understood due to the non-linearity of air-land interaction processes. This study describes the results from Monin Obukhov similarity theory and statistical analysis of meteorological observations collected by a network of ten Automatic Weather Stations (AWSs). The stations were in operation in the Highveld Priority Area (HPA) of the Republic of South Africa during 2008 – 2010. The spatial distribution of stability regimes as presented by both bulk Richardson number (BRN) and Obukhov length (L) indicates that HPA is dominated by strong stability regime. The momentum and heat fluxes show no significant spatial variation between stations. Statistical analysis revealed localization, enhancement and homogenization in the inter-station variability of observed meteorological quantities (temperature, relative humidity and wind speed) over diurnal and seasonal cycles. Enhancement of the meteorological spatial variability was found on a broad range of scales from 20 to 50 km during morning hours and in the dry winter season. These spatial scales are comparable to scales of observed land use heterogeneity, which suggests links between atmospheric variability and land use patterns through excitation of horizontal meso-scale circulations. Convective motions homogenized and synchronized meteorological variability during afternoon hours in the winter seasons, and during large parts of the day during the moist summer season. The analysis also revealed that turbulent convection overwhelms horizontal meso-scale circulations in the study area during extensive parts of the annual cycle Geography, Geoinformatics and Meteorology Unrestricted 2013-09-06T18:16:48Z 2013-05-24 2013-09-06T18:16:48Z 2013-04-17 2013-05-24 2013-05-16 Dissertation Luhunga, PM 2013, Atmospheric boundary layer characterizations over Highveld Region South Africa, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/24754 > E13/4/503/gm http://hdl.handle.net/2263/24754 http://upetd.up.ac.za/thesis/available/etd-05162013-180816/ © 2013 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria application/pdf University of Pretoria |
| spellingShingle | Statistical data analysis Lidar Air-land interactions Micro-meteorology Atmospheric boundary layer UCTD Atmospheric boundary layer characterizations over Highveld Region South Africa |
| title | Atmospheric boundary layer characterizations over Highveld Region South Africa |
| title_full | Atmospheric boundary layer characterizations over Highveld Region South Africa |
| title_fullStr | Atmospheric boundary layer characterizations over Highveld Region South Africa |
| title_full_unstemmed | Atmospheric boundary layer characterizations over Highveld Region South Africa |
| title_short | Atmospheric boundary layer characterizations over Highveld Region South Africa |
| title_sort | atmospheric boundary layer characterizations over highveld region south africa |
| topic | Statistical data analysis Lidar Air-land interactions Micro-meteorology Atmospheric boundary layer UCTD |
| url | http://hdl.handle.net/2263/24754 http://upetd.up.ac.za/thesis/available/etd-05162013-180816/ |