A5051750487- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Meteorological Phenomena and Simulations
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Ocean Acidification Effects and Responses
- Aeolian processes and effects
- Climate variability and models
- Methane Hydrates and Related Phenomena
- COVID-19 impact on air quality
- Spectroscopy and Laser Applications
- Marine and coastal ecosystems
- Ocean Waves and Remote Sensing
- Water Quality and Pollution Assessment
- Robotics and Automated Systems
- IoT-based Smart Home Systems
- Digital Accessibility for Disabilities
- Calibration and Measurement Techniques
- Solar Radiation and Photovoltaics
- Target Tracking and Data Fusion in Sensor Networks
- Healthcare and Environmental Waste Management
Vikram Sarabhai Space Centre
2014-2024
Cochin University of Science and Technology
2012
Indian Space Research Organisation
2008
The Indo‐Gangetic Plain (IGP) encompasses a vast area, (accounting for ∼21% of the land area India), which is densely populated (accommodating ∼40% Indian population). Highly growing economy and population over this region results in wide range anthropogenic activities. A large number thermal power plants (most them coal fed) are clustered along region. Despite its importance, detailed investigation aerosols sparse. During an intense field campaign winter 2004, extensive aerosol atmospheric...
[1] Simultaneous measurements of near-surface ozone, NOx (NO + NO2), and meteorological parameters were carried out at the tropical coastal location Trivandrum (8.55°N, 77°E) in India from November 2007 to May 2009. The data have been used investigate diurnal seasonal patterns ozone its precursor, NOx, also interdependence these two chemical species. pattern is found be closely associated with mesoscale circulation (sea breeze land breeze) availability NOx. daytime peak extends until onset...
During an intense field campaign for generating a spatial composite of aerosol characteristics over peninsular India, collocated measurements the mass concentration and size distribution near‐surface aerosols were made onboard instrumented vehicles along road network during dry, winter season (February–March) 2004. The study regions covered coastal, industrial, urban, village, remote, semiarid, vegetated forestlands. results showed (1) comparatively high (mass) concentrations (exceeding 50...
Using aerosol optical depth as a function of wavelength obtained from ground-based multiwavelength radiometer observations, columnar size-distribution functions aerosols have been derived. It has found that the nature derived is strongly dependent on season. The are discussed in term seasonally natural sources and sinks.
Chemical composition of near‐surface aerosols at the tropical coastal location Trivandrum (8.55°N, 77°E) has been studied by analyzing aerosol samples collected during a period 16 months from October 2003 to January 2005. The annual mean mass loading this site averages around 54 ± 19 μ g m −3 . chemical analysis revealed Cl − , SO 4 2− and NO 3 be major anionic species Na, NH + Fe, Ca cationic species. total concentration various showed pronounced seasonal dependence. active sources have...
Abstract. We present shipborne measurements of surface ozone (O3), carbon monoxide (CO), and methane (CH4) over the Bay Bengal (BoB), first time such have been performed during summer monsoon season, as a part Continental Tropical Convergence Zone (CTCZ) experiment 2009. O3, CO, CH4 mixing ratios exhibited significant spatial temporal variability in ranges 8–54 nmol mol−1, 50–200 1.57–2.15 µmol with means 29.7 ± 6.8 96 25 1.83 0.14 respectively. The average trace gases BoB air masses from...
Abstract Non‐methane hydrocarbons (NMHCs) are ubiquitous trace gases and profoundly affect the Earth's atmosphere climate change. Mixing ratios of light NMHCs were measured over northern Indian Ocean during winter‐2018 as part Integrated Campaign for Aerosols, gases, Radiation Budget (ICARB‐2018). Higher levels coastal regions due to efficient transport anthropogenic biogenic air masses higher air‐sea exchanges biological productivity. Although oceanic emissions dominated open ocean, aged...
Abstract. MODIS (Moderate Resolution Imaging Spectroradiometer) Level-3 aerosol optical depth (AOD) data and NCEP (National Centre for Environmental Prediction) reanalysis winds were incorporated into an flux continuity equation, a quantitative assessment of the sources generation over Ganga basin in winter month December 2004. Preliminary analysis on distribution wind fields showed convergence to be important factor which, supported by regional topography, confines aerosols long band Indo...
Studies on the solar eclipse–induced changes in near‐surface ozone and its precursors NO x CO were carried out at two nearby tropical coastal locations, Thumba (very close to sea) Centre for Earth Science (CESS), which is 4.5 km off coast with varying topography, during annular eclipse of 15 January 2010. The surface decreased by 12 13 ppb (35% 52%) over CESS, time lag 40 min 25 from maximum phase eclipse, respectively, post‐eclipse recovery was faster compared Thumba. No pronounced change...
Abstract. Measurements of ozone and NO2 were carried out in the marine environment Bay Bengal (BoB) during winter months, December 2008–January 2009, as part second Integrated Campaign for Aerosols, gases Radiation Budget conducted under Geosphere Biosphere Programme Indian Space Research Organization. The mixing ratio was found to be high head southeast BoB with a mean value 61 ± 7 ppb 53 6 ppb, respectively. ratios CO also relatively these regions. spatial patterns examined light airflow...