Venkataraman Sivakumar
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View article: Comparative Study of Outcomes of Transradial Versus Transfemoral Approach for Hepatic Arterial Embolization Using Transarterial Chemoembolization (TACE) Technique in Patients with Hepatocellular Carcinoma at a Tertiary Care Hospital
Comparative Study of Outcomes of Transradial Versus Transfemoral Approach for Hepatic Arterial Embolization Using Transarterial Chemoembolization (TACE) Technique in Patients with Hepatocellular Carcinoma at a Tertiary Care Hospital Open
Hepatocellular carcinoma (HCC) is among the leading causes of cancer-related deaths worldwide. Transarterial chemoembolization (TACE) remains the standard locoregional therapy for intermediate-stage disease. Traditionally performed via the…
View article: Decadal changes in meteorological extremes and environmental consequences in the Caspian Sea Region
Decadal changes in meteorological extremes and environmental consequences in the Caspian Sea Region Open
Using data from the MERRA-2 database, the study identifies a clear warming trend in August, with significant peaks in the annual average air temperature in 2010 (28.3 °C) and 2021 (27.9 °C) in the Caspian Sea. Concurrently, the Caspian Sea…
View article: Evidence for Subtropical Dynamical Changes in Reunion Ozone Trends (1998-2021)
Evidence for Subtropical Dynamical Changes in Reunion Ozone Trends (1998-2021) Open
International audience
View article: Characterization of aerosol optical depth (AOD) anomalies in September and October 2022 over Skukuza in South Africa
Characterization of aerosol optical depth (AOD) anomalies in September and October 2022 over Skukuza in South Africa Open
Most major field campaigns, such as the Southern Africa Fire Atmosphere Research Initiative (SAFARI-92 and SAFARI-2000) and AErosol, RadiatiOn and CLOuds in southern Africa (AEROCLO-sA), have focused on the west coast of southern Africa, l…
View article: Study on associated effects of extreme drought and heatwave on air quality in South Africa during october 2022
Study on associated effects of extreme drought and heatwave on air quality in South Africa during october 2022 Open
This study investigates the impact of combined drought and extreme heatwave events on air quality in South Africa during October 2022 (study period). An analysis of meteorological data revealed a sharp increase in surface air temperature a…
View article: Torrential rainfall with severe flooding associated with a baroclinic disturbance on November 17, 2023, United Arab Emirates (UAE)
Torrential rainfall with severe flooding associated with a baroclinic disturbance on November 17, 2023, United Arab Emirates (UAE) Open
International audience
View article: STUDIES ON PER SE PERFORMANCE OF COCONUT HYBRIDS (COCOS NUCIFERA L.)
STUDIES ON PER SE PERFORMANCE OF COCONUT HYBRIDS (COCOS NUCIFERA L.) Open
View article: Unveiling meteorological synergies in the coupling of an abnormal easterly wave and cutoff low in South Africa's February 2023 rainfall
Unveiling meteorological synergies in the coupling of an abnormal easterly wave and cutoff low in South Africa's February 2023 rainfall Open
This study seeks to understand the meteorological mechanisms that caused widespread and heavy rainfall from 6 to 14 February 2023, over southern Mozambique and the eastern and northeastern areas in South Africa, including Limpopo Province,…
View article: Modelling drought in South Africa: meteorological insights and predictive parameters
Modelling drought in South Africa: meteorological insights and predictive parameters Open
View article: Thermospheric NO Cooling During 2003 October “Halloween Storm”: Revisited
Thermospheric NO Cooling During 2003 October “Halloween Storm”: Revisited Open
The Nitric Oxide (NO) emission at 5.3 μm wavelength is a well‐known coolant above 100 km. It effectively regulates thermospheric temperature during space weather events. We studied NO cooling emission over Tromsø (geographic:69.59°N, 19.22…
View article: Characterization of AOD anomalies in September and October 2022 over Skukuza in South Africa
Characterization of AOD anomalies in September and October 2022 over Skukuza in South Africa Open
Abstract. This case study presents the evolution of aerosol optical properties during Intensive Observational Period (IOP) of the Biomass Burning Aerosol Campaign (BiBAC) in the Kruger National Park at Skukuza, between 18 …
View article: A case study on more recent heat wave occurred in South Africa, based on background weather synoptic and dynamic characteristics analysis
A case study on more recent heat wave occurred in South Africa, based on background weather synoptic and dynamic characteristics analysis Open
This study investigates the characteristics of the more recent heat wave episode in South Africa during January 2023. The evaluation of several meteorological parameters using different reanalysis models and observational datasets have dem…
View article: Thermospheric nitric oxide energy budget during extreme geomagnetic storms: a comparative study
Thermospheric nitric oxide energy budget during extreme geomagnetic storms: a comparative study Open
We selected three superstorms (disturbance storm time [Dst] index less than −350 nT) of 2003–04 to study the thermospheric energy budget with a particular emphasis on the thermospheric cooling emission by nitric oxide via a wavelength of 5…
View article: Characterization of AOD anomalies in September and October 2022 over Skukuza in South Africa
Characterization of AOD anomalies in September and October 2022 over Skukuza in South Africa Open
This case study presents the evolution of aerosol optical properties during Intensive Observational Period (IOP) of the Biomass Burning Aerosol Campaign (BiBAC) in the Kruger National Park at Skukuza, between 18 and 23 September (Event 1) …
View article: A Case Study on the Dust Storm that Occurred on March 13-18, 2022, Over the Algerian Sahara, Using Satellite Remote Sensing
A Case Study on the Dust Storm that Occurred on March 13-18, 2022, Over the Algerian Sahara, Using Satellite Remote Sensing Open
View article: Decreasing trend in SO2 concentrations over Durban: 2004 - 2014
Decreasing trend in SO2 concentrations over Durban: 2004 - 2014 Open
The climatology of ambient SO2 air pollution was investigated in Durban, South Africa using data collected by seven air quality monitoring stations (Ferndale, Grosvenor, Jacobs, Wentworth, Settlers School, Southern Works and Prospecton) op…
View article: A case study about the forest fire occurred on 05 July 2021 over Khenchela province, Algeria, using space-borne remote sensing
A case study about the forest fire occurred on 05 July 2021 over Khenchela province, Algeria, using space-borne remote sensing Open
In this study, space-borne remote sensing (Landsat-8, MODIS) was employed to evaluate the effects of forest fires occurring on 05 July 2021, over Khenchela province, Algeria. Our objective is to understand the severity of damage caused by …
View article: A case study of an extreme flooding episode in Charikar, Eastern Afghanistan
A case study of an extreme flooding episode in Charikar, Eastern Afghanistan Open
This work investigates the meteorological mechanisms forming a classical frontal system on 26 August 2020 in the northeast and eastern parts of Afghanistan. The weather system caused heavy rainfall and led to severe flash floods. Flooding,…
View article: Tracking the Transport of SO2 and Sulphate Aerosols from the Tonga Volcanic Eruption to South Africa
Tracking the Transport of SO2 and Sulphate Aerosols from the Tonga Volcanic Eruption to South Africa Open
During a volcanic eruption, copious amounts of volcanic gas, aerosol droplets, and ash are released into the stratosphere, potentially impacting radiative feedback. One of the most significant volcanic gases emitted is sulphur dioxide, whi…
View article: A case study of weather impact on air pollution during the COVID-19 pandemic in South Africa
A case study of weather impact on air pollution during the COVID-19 pandemic in South Africa Open
This study investigates climate, weather characteristics, and air pollution during the third COVID-19 wave in South Africa. During this time, a decrease in of SO2 and NO2 column mass was observed. The investigation displays a positive tren…
View article: Characteristics of Absorbing and Non-Absorbing Aerosol over South Africa using MODIS and OMI satellite measurements
Characteristics of Absorbing and Non-Absorbing Aerosol over South Africa using MODIS and OMI satellite measurements Open
A study on the spatiotemporal variation of aerosols over South Africa was conducted using MODIS, OMI, MERRA-2 and CALIPSO data from 2004 to 2023. The study showed that absorbing aerosols dominates the aerosol regime in all the study locati…
View article: Aerosol Optical Properties and Types over Southern Africa and Reunion Island Determined from Ground-Based and Satellite Observations over a 13-Year Period (2008–2021)
Aerosol Optical Properties and Types over Southern Africa and Reunion Island Determined from Ground-Based and Satellite Observations over a 13-Year Period (2008–2021) Open
Fires occur seasonally in Southern Africa, from June to November, increasing tropospheric aerosol loading and triggering harmful consequences for the environment and human health. This study aims to examine 13 years of aerosol optical char…
View article: Simultaneous profiling of dust aerosol mass concentration and optical properties with polarized high-spectral-resolution lidar
Simultaneous profiling of dust aerosol mass concentration and optical properties with polarized high-spectral-resolution lidar Open
Dust particles originating from arid desert regions can be transported over long distances, presenting severe risks to climate, environment, social economics, and human health at the source and downwind regions. However, there has been a d…
View article: Characteristics and Long-Term Trends of Heat Stress for South Africa
Characteristics and Long-Term Trends of Heat Stress for South Africa Open
Increasing air temperature coupled with high humidity due to ongoing climate change across most parts of South Africa is likely to induce and intensify heat exposure, particularly in densely populated areas. The adverse health implications…
View article: Qualitative Study on the Observations of Emissions, Transport, and the Influence of Climatic Factors from Sugarcane Burning: A South African Perspective
Qualitative Study on the Observations of Emissions, Transport, and the Influence of Climatic Factors from Sugarcane Burning: A South African Perspective Open
There are two methods of harvesting sugarcane—manual or mechanical. Manual harvesting requires the burning of the standing sugarcane crop. Burning of the crop results in the emission of aerosols and harmful trace gases into the atmosphere.…
View article: The first national scale spatial and temporal analysis of surface CO<sub>2</sub> over South Africa utilising satellite retrievals
The first national scale spatial and temporal analysis of surface CO<sub>2</sub> over South Africa utilising satellite retrievals Open
South Africa is the dominant continental source region of CO2 fossil fuel emissions. This is a result of the strong dependence of its economy on fossil fuels. However, the observations of atmospheric CO2 in South Africa are inadequate. The…
View article: A Literature Review of the Impacts of Heat Stress on Human Health across Africa
A Literature Review of the Impacts of Heat Stress on Human Health across Africa Open
Heat stress-related illness attributed to the changing climate, particularly the more frequent extreme high temperatures, is becoming a theme of public concern, especially in the most vulnerable regions, such as the African continent. Know…
View article: Investigating the Long-Range Transport of Aerosol Plumes Following the Amazon Fires (August 2019): A Multi-Instrumental Approach from Ground-Based and Satellite Observations
Investigating the Long-Range Transport of Aerosol Plumes Following the Amazon Fires (August 2019): A Multi-Instrumental Approach from Ground-Based and Satellite Observations Open
Despite a number of studies on biomass burning (BB) emissions in the atmosphere, observation of the associated aerosols and pollutants requires continuous efforts. Brazil, and more broadly Latin America, is one of the most important season…
View article: Ozone Variability and Trend Estimates from 20-Years of Ground-Based and Satellite Observations at Irene Station, South Africa
Ozone Variability and Trend Estimates from 20-Years of Ground-Based and Satellite Observations at Irene Station, South Africa Open
While the stratospheric ozone protects the biosphere against ultraviolet (UV) radiation, tropospheric ozone acts like a greenhouse gas and an indicator of anthropogenic pollution. In this paper, we combined ground-based and satellite ozone…
View article: Stratosphere–Troposphere Exchange and O3 Variability in the Lower Stratosphere and Upper Troposphere over the Irene SHADOZ Site, South Africa
Stratosphere–Troposphere Exchange and O3 Variability in the Lower Stratosphere and Upper Troposphere over the Irene SHADOZ Site, South Africa Open
This study aims to investigate the Stratosphere-Troposphere Exchange (STE) events and ozone changes over Irene (25.5° S, 28.1° E). Twelve years of ozonesondes data (2000–2007, 2012–2015) from Irene station operating in the framework of the…