Observation of Clouds Using the CSIR Transportable LIDAR: A Case Study over Durban, South Africa

Shikwambana, Lerato; Sivakumar, Venkataraman

doi:10.1155/2016/4184512

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…The presence of supercooled water was distinctly observed by [74]. It was possible to clearly differentiate between the stratocumulus and cirrus cloud [76] in a study in Durban, South Africa. Several in-depth studies of cirrus clouds characterization were conducted [39,[77][78][79] using ground-based LIDAR observation.…”

Section: Introductionmentioning

confidence: 90%

Profiling of Aerosols and Clouds over High Altitude Urban Atmosphere in Eastern Himalaya: A Ground-Based Observation Using Raman LIDAR

et al. 2023

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Profiles of aerosols and cloud layers have been investigated over a high-altitude urban atmosphere in the eastern Himalayas in India, for the first time, using a Raman LIDAR. The study was conducted post-monsoon season over Darjeeling (latitude 27°01′ N longitude 88°36′ E, 2200 masl), a tourist destination in north-eastern India. In addition to the aerosols and cloud characterization and atmospheric boundary layer detection, the profile of the water vapor mixing ratio has also been analyzed. Effects of atmospheric dynamics have been studied using the vertical profiles of the normalized standard deviation of RCS along with the water vapor mixing ratio. The aerosol optical characteristics below and above the Atmospheric Boundary Layer (ABL) region were studied separately, along with the interrelation of their optical and microphysical properties with synoptic meteorological parameters. The backscatter coefficient and the extinction coefficient were found in the range from 7.15×10−10 m−1 sr−1 to 3.01×10−5 m−1 sr−1 and from 1.02×10−5 m−1 to 2.28×10−3 m−1, respectively. The LIDAR ratio varies between 3.9 to 78.39 sr over all altitudes. The variation of the linear depolarization ratio from 0.19 to 0.32 indicates the dominance, of non-spherical particles. The periodicity observed in different parameters may be indicative of atmospheric wave phenomena. Cloud parameters, such as scattering coefficients, top and bottom height, and optical depth for different cloud phases, have been evaluated. A co-located Micro Rain Radar has been used with LIDAR for cloud life cycle study.

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Section: Introductionmentioning

confidence: 90%

Profiling of Aerosols and Clouds over High Altitude Urban Atmosphere in Eastern Himalaya: A Ground-Based Observation Using Raman LIDAR

et al. 2023

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“…() have given a more detailed description of the CSIR National Laser Centre mobile LIDAR system. More recent work by Shikwambana and Sivakumar () address the scientific results obtained and data analysis. LIDAR measurements were carried out only during the day from July 11 to 18, 2014, in Lephalale (23.6665 ° S, 27.7448 ° E).…”

Section: Methods and Datamentioning

confidence: 99%

Investigation of various aerosols over different locations in South Africa using satellite, model simulations and LIDAR

Shikwambana

Sivakumar

2018

Meteorological Applications

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Decadal studies (2004–2014) of various aerosols were carried out over South Africa (SA) using various satellite data and model simulations. The aerosols investigated included black carbon (BC), sulphate, dust and marine aerosols. BC aerosols were observed to be dominant in the northeastern parts of SA while sulphate aerosols were dominant in eastern parts of the country. Seasonal studies revealed that BC aerosols were more dominant in the eastern parts of SA during spring and less dominant in autumn. Sulphate also showed dominance in the eastern parts of SA during summer and less dominance in winter. The high sulphate concentration in summer is a result of an increase in relative humidity which favours the production of sulphates. Air masses from the north and northeastern parts of the subcontinent were responsible for the transport of BC resulting from biomass burning into SA. The Goddard Chemistry Aerosol Radiation and Transport model indicated that there was no significant change in the sulphate aerosol trends from 2004 to 2007. The highest sulphate aerosol levels were observed in the summer whilst the lowest sulphate aerosol levels were observed in winter. The Council for Scientific and Industrial Research (CSIR) Light Detection and Ranging (LIDAR) was used to carry out measurements in Lephalale during July 10–18, 2014. Aerosol extinction co‐efficient profiles were retrieved by the CSIR mobile LIDAR and were compared to aerosol extinction co‐efficient profiles retrieved from the Cloud‐Aerosol LIDAR and Infrared Pathfinder Satellite Observations (CALIPSO). The aerosol extinction co‐efficients of 0.26 and 0.17/km on July 14 and 16, 2014, respectively could be identified as dust aerosols.

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Handling Disturbance in Optical Beam Alignment Using the MPC Approach

Ramdani,

Traïche,

Grouni

2024

J Russ Laser Res

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Observation of Clouds Using the CSIR Transportable LIDAR: A Case Study over Durban, South Africa

Cited by 6 publications

References 27 publications

Profiling of Aerosols and Clouds over High Altitude Urban Atmosphere in Eastern Himalaya: A Ground-Based Observation Using Raman LIDAR

Profiling of Aerosols and Clouds over High Altitude Urban Atmosphere in Eastern Himalaya: A Ground-Based Observation Using Raman LIDAR

Investigation of various aerosols over different locations in South Africa using satellite, model simulations and LIDAR

Handling Disturbance in Optical Beam Alignment Using the MPC Approach

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