A5083495821- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Cryospheric studies and observations
- Precipitation Measurement and Analysis
- Air Quality Monitoring and Forecasting
- Wind and Air Flow Studies
- Ionosphere and magnetosphere dynamics
- Tree-ring climate responses
- Tropical and Extratropical Cyclones Research
- Radio Wave Propagation Studies
- Rangeland Management and Livestock Ecology
- Urban Heat Island Mitigation
- COVID-19 impact on air quality
- Plant Water Relations and Carbon Dynamics
- Landslides and related hazards
- Plant responses to elevated CO2
- Remote Sensing and LiDAR Applications
- Aeolian processes and effects
- Solar and Space Plasma Dynamics
- Impact of Light on Environment and Health
Aryabhatta Research Institute of Observational Sciences
2015-2024
Energy and Resources Institute
2020
Indian Institute of Astrophysics
2011
Yonsei University
2008
Abstract Fine particulate matter (PM 2.5 , aerodynamic diameter ≤2.5 µm) impacts the climate, reduces visibility and severely influences human health. The Indo-Gangetic Plain (IGP), home to about one-seventh of world’s total population a hotspot aerosol loading, observes strong enhancements in PM concentrations towards winter. We performed high-resolution (12 km × 12 km) atmospheric chemical transport modeling (WRF-Chem) for post-monsoon winter transition unravel underlying dynamics regional...
[1] The first ever, year-round measurements of aerosol black carbon (BC) over the western part trans- Himalayas are reported from Hanle (∼4520 m above mean sea level). daily BC concentrations varied as low 7 ng m−3 to high 296 with an annual average 77 ± 64 m−3, indicating significant burden even at free- tropospheric altitudes. Variation in day well were highly subdued during winter season (December February) while they used be highest Spring (March May). In general, less frequently...
Abstract Delhi, a tropical Indian megacity, experiences one of the most severe air pollution in world, linked with diverse anthropogenic and biomass burning emissions. First phase COVID-19 lockdown India, implemented during 25 March to 14 April 2020 resulted dramatic near-zeroing various activities (e.g. traffic, industries, constructions), except “essential services”. Here, we analysed variations fine particulate matter (PM 2.5 ) over Delhi-National Capital Region. Measurements revealed...
Abstract The past decade has seen episodes of increasingly severe air pollution across much the highly populated Indo-Gangetic Plain (IGP), particularly during post-monsoon season when crop residue burning (CRB) is most prevalent. Recent studies have suggested that a major, possibly dominant contributor to this quality decline northwest (NW) Indian rice shifted later into season, as an unintended consequence 2009 groundwater preservation policy delayed sowing irrigated paddy. Here we combine...
Exposure to particulate matter less than 2.5 µm in diameter (PM2.5) is a cause of concern cities and major emission regions northern India. An intensive field campaign involving the states Punjab, Haryana Delhi national capital region (NCR) was conducted 2022 using 29 Compact Useful PM2.5 Instrument with Gas sensors (CUPI-Gs). Continuous observations show that increased gradually from < 60 µg m-3 6-10 October up 500 on 5-9 November, which subsequently decreased about 100 20-30 November. Two...
Abstract. We investigate the time evolution of Local Boundary Layer (LBL) for first over a mountain ridge at Nainital (79.5° E, 29.4° N, 1958 m a.m.s.l.) in central Himalayan region, using radar wind profiler (RWP) during November 2011 to March 2012, as part Ganges Valley Aerosol Experiment (GVAX). restrict our analysis clear–sunny days, resulting total 78 days observations. The standard criterion peak signal-to-noise ratio (S ∕ N) profile was found be inadequate characterization mixed layer...
Abstract. The sensitive ecosystem of the central Himalayan (CH) region, which is experiencing enhanced stress from anthropogenic forcing, requires adequate atmospheric observations and an improved representation Himalaya in models. However, accuracy models remains limited this region due to highly complex mountainous topography. This article delineates effects spatial resolution on modeled meteorology dynamics over CH by utilizing Weather Research Forecasting (WRF) model extensively...
The impact of long-range transported dust aerosols, originating from the Thar Desert region, to a high-altitude station in central Himalayas was studied with help micro-pulse lidar (MPL) observations. A drastic change back-scatter profile observed on day as compared that pre-dust day. coefficient revealed layer peaked at an altitude ∼1300 m above ground level (AGL) and extended up ∼3000 AGL, maximum value ∼3 × 10–5 m–1 sr–1. Aerosol Index (AI) air mass back-trajectory analysis substantiate...
[1] Number-size distributions of ultrafine, fine, and accumulation mode aerosols in the size range 5–1300 nm have been measured regularly from pristine, high-altitude (for 4520 m above mean sea level) station Hanle Trans-Himalaya during summer autumn (August–November) 2009. The total number concentration ranged 80 to 8000 cm−3 with a value 1150 cm−3. Examination temporal variations indicated that formation new ultrafine particles precursor gases (probably transported valley regions) was...
An extensive field study, RAWEX-GVAX, was carried out during a 10-month (June 2011-March 2012) campaign at ARIES, Nainital and observations on wide range of parameters like physical optical properties aerosols, meteorological boundary layer evolution were made. This work presents results obtained from high-frequency (four launches per day), balloon-borne (pressure, temperature, relative humidity, wind speed direction). These show as high 84 m/s near the subtropical jet. It is shown that...