A5101413622- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- COVID-19 impact on air quality
- Infection Control and Ventilation
- Reservoir Engineering and Simulation Methods
- COVID-19 and healthcare impacts
- COVID-19 epidemiological studies
- Hydraulic Fracturing and Reservoir Analysis
- Urban Heat Island Mitigation
- Aeolian processes and effects
- Remote Sensing in Agriculture
- Solar Radiation and Photovoltaics
- Inhalation and Respiratory Drug Delivery
- Remote Sensing and LiDAR Applications
- Climate Change Policy and Economics
- Radio Wave Propagation Studies
- Hydrocarbon exploration and reservoir analysis
- Radio Astronomy Observations and Technology
- Precipitation Measurement and Analysis
- Vehicle emissions and performance
- Enhanced Oil Recovery Techniques
- Meteorological Phenomena and Simulations
Shell (Netherlands)
2023-2024
Council of Scientific and Industrial Research
2012-2022
Academy of Scientific and Innovative Research
2018-2022
CSIR National Physical Laboratory of India
2012-2022
National Physical Laboratory
2014
Scripps Institution of Oceanography
2014
University of California, San Diego
2014
Indian Institute of Technology Kanpur
2008-2012
COVID-19 disease is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which originated in Wuhan, China and spread with an astonishing rate across the world. The transmission routes of SARS-CoV-2 are still debated, but recent evidence strongly suggests that could be transmitted via air poorly ventilated places. Some studies also suggest higher surface stability as compared to SARS-CoV-1. It possible small viral particles may enter into indoor environments from various...
To investigate the probable mixing state of aerosols in Indo‐Gangetic Basin, six different cases, viz. external mixing, internal and four combinations core‐shell type (black carbon, BC over dust, water‐soluble BC) have been considered. Composite single scattering albedo (SSA) computed for cases post‐monsoon, winter pre‐monsoon seasons are compared with Aerosol Robotic Network (AERONET) retrieved SSA values. The most post‐monsoon season seems either to be or coating dust season, state....
The aim of this study conducted at Kanpur (26.51°N, 80.23°E), India, was to quantify chemical properties dust and the intensity mixing, due its interaction with various emissions from anthropogenic activities, during long range transport. Aerosol mass collected Indian Institute Technology, (IIT-K) located in Indo-Gangetic Plain April–July 2011, a period marked by intense storms onset monsoon. sampling days were classified as Dust, Polluted Dust1 (PD1), Dust2 (PD2) Continental days. PM10...
The direct radiative forcing (DRF) of dust particles is most uncertain among all the major aerosol species because large regional variation in their shapes and composition. Indian Desert known to be a source natural mineral nonspherical shapes. Particle shape exact mineralogical information are essential for modeling optical properties as latter governs refractive indices. realistic shapes, namely, sphere, spheroid, Chebyshev, cylinder, based on Scanning Electron Microscope (SEM) images,...
The regional dust morphology and spectral refractive indices (RIs; governed by hematite, Fe2O3 content at short wavelengths) are key elements for ascertaining direct radiative forcing of mineral aerosols. To provide morphological features background from a semi-arid zone in the vicinity Thar Desert, we carried out an expedition to Jaipur city during late winter 2012. Morphological analysis reveals predominance "Layered", "Angular" "Flattened" particles, while frequency distribution total 235...
The assessment of direct radiative forcing (DRF) aerosol is uncertain, particularly where the natural dust particles mix with anthropogenic components. One sources such uncertainty assumption morphology (size and shape) composition pure particles. Recently Mishra Tripathi [2008] have computationally assessed effect particle on optical properties over Great Indian Desert. As a continuation previous study, in this paper, we further examined effects properties. Non‐spherical show large...
The morphology, mixing state and hematite content of polluted mineral dust are not well accounted in the optical models this leads to uncertainty radiative forcing estimation. In present study, based on morphological mineralogical characterisation dust, three-sphere, two-sphere two-spheroid model shapes considered. properties above computed using Discrete Dipole Approximation code. single scattering albedo, ω 0, was found vary depending (0–6%) shape. For BC-mineral system, be a dominating...
The quantification of the radiative impacts light absorbing ambient black carbon (BC) particles strongly depends on accurate measurements BC mass concentration and absorption coefficient (β(abs)). In this study, an experiment has been conducted to quantify influence hygroscopic growth absorption. Using factor (i.e., Zdanovskii-Stokes-Robinson (ZSR) approach), a model developed predict chemical composition based measurements, scattering coefficients are derived using core-shell assumption...
Mineral dust particles in the lower atmosphere may significantly influence radiative and optical budgets, along with net chemical balance, through their interactions ambient chemicals. Their ability to absorb/scatter incoming radiation strongly depends on composition (i.e., distribution of major crustal elements), but as yet there is no adequate regional database regard this for Indian region. To create a background mineral from semi-arid zone western India, we measured (with aerodynamic...
The airborne transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been identified as a potential pandemic challenge, especially in poorly ventilated indoor environments, such certain hospitals, schools, public buildings, and transports. impacts meteorological parameters (temperature humidity) physical property (droplet size) on the settings have previously investigated. However, chemical properties viral droplets aerosol particles (i.e., composition acidity (pH))...
We develop a numerical algorithm for calculating the light-scattering properties of small particles arbitrary shape on basis method involving surface integral equations. The calculation error was estimated by performing comparison between proposed and exact Mie with regard to extinction efficiency factor, results show that is less than 1% when four or more nodes per wavelength are set spherical particle. accuracy fluctuates in accordance distribution nodal points particle respect direction...