Browsing Research Articles (Geography, Geoinformatics and Meteorology) by UP Author "Sivakumar, Venkataraman"
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Browsing Research Articles (Geography, Geoinformatics and Meteorology) by UP Author "Sivakumar, Venkataraman"
Now showing items 1-10 of 10
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Tesfaye, M.; Sivakumar, Venkataraman; Botai, Joel Ongego; Tsidu, G. Mengistu (American Geophysical Union, 2011)In this paper, we present a detailed study of the spatial and seasonal aerosol climatology over South Africa (SA), based on Multiangle Imaging Spectroradiometer (MISR) data. We have used 10 years (2000–2009) of MISR ...
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Sivakumar, Venkataraman; Tesfaye, M.; Alemu, W.; Moema, D.; Sharma, Ameeth; Bollig, C.; Mengistu, G. (Academy of Science of South Africa, 2009-11)We present the first scientific results from the Council for Scientific and Industrial Research-National Laser Centre (CSIR-NLC) mobile LIght Detection And Ranging (LIDAR) and its validation and comparison with other ...
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Botai, Joel Ongego; Combrinck, Ludwig; Sivakumar, Venkataraman (Geological Society of South Africa, 2011-12)We investigate the use of distribution functions to characterise the geophysical signals and noise components embedded in the geodetic Very Long Baseline Interferometry (VLBI) data sets across some of the International ...
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Prasanth, P. Vishnu; Sivakumar, Venkataraman; Sridharan, S.; Kumar, Y. Bhavani; Bencherif, Hassan; Rao, D. Narayana (European Geosciences Union, 2009)In this paper, we present seasonal and nocturnal variations of mesospheric sodium (Na) layer parameters observed over Gadanki (13.5° N, 79.2° E), based on 166 nights during the period from January 2005 to December 2006, ...
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Mbatha, Nkanyiso; Sivakumar, Venkataraman; Bencherif, Hassan; Malinga, Sandile B.; Pillay, Sadhasivan R.; Moorgawa, Ashokabose; Michaelis, Max M. (Academy of Science of South Africa, 2012-01-12)Studying the middle atmospheric thermal structure over southern Africa is an important activity to improve the understanding of atmospheric dynamics of this region. Observations of a middle atmosphere thermal structure ...
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Sivakumar, Venkataraman; Prasanth, P. Vishnu; Kishore, P.; Bencherif, Hassan; Keckhut, P. (European Geosciences Union, 2011-04-12)For the first time, climatology of the middle atmosphere thermal structure is presented, based on 14 years of LIDAR and satellite (HALOE, SABER, CHAMP and COSMIC) temperature measurements. The data is collected over a ...
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Mbatha, Nkanyiso; Sivakumar, Venkataraman; Malinga, Sandile B.; Bencherif, Hassan; Pillay, Sadhasivan R. (Copernicus on behalf of the European Geosciences Union, 2010-04)The occurrence of a sudden stratospheric warming (SSW) excites disturbances in the mesosphere-lower thermospheric (MLT) wind and temperature. Here, we have examined the high frequency (HF) radar wind data from the South ...
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Sharma, Ameeth; Sivakumar, Venkataraman; Bollig, C.; Van der Westhuizen, C.; Moema, D. (Academy of Science of South Africa, 2009-11)South Africa's first mobile LIDAR (LIght Detection And Ranging) system is being developed at the National Laser Centre (NLC) of the Council for Scientific and Industrial Research (CSIR) in Pretoria (25°45'S; 28°17'E). The ...
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Temperature variability and trends in the UT-LS over a subtropical site : Reunion (20.8 S, 55.5 E) Begue, N.; Bencherif, Hassan; Sivakumar, Venkataraman; Kirgis, G.; Mze, N.; Leclair de Bellevue, J. (Copernicus on behalf of the European Geosciences Union, 2010-09)This paper mainly focuses on the trends and variability of the UT-LS temperature using radiosonde observations carried out over 16 years (January 1993 to December 2008) from a southern subtropical site, Reunion (20.8 S, ...
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Sivakumar, Venkataraman; Bencherif, Hassan; Begue, N.; Thompson, A.M. (American Meteorological Society, 2011-07)In this paper, tropopause characteristics observed from tropical to subtropical Southern Hemisphere stations using Southern Hemisphere Additional Ozonesonde (SHADOZ) data are presented for the 11-yr period of 1998–2008. ...
Now showing items 1-10 of 10