A5008549381- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- COVID-19 impact on air quality
- Astro and Planetary Science
- Planetary Science and Exploration
- Vehicle emissions and performance
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Advanced Chemical Sensor Technologies
- Climate variability and models
- Solar and Space Plasma Dynamics
- Water Quality and Pollution Assessment
- Lightning and Electromagnetic Phenomena
- Impact of Light on Environment and Health
- Radioactive contamination and transfer
- Heavy metals in environment
- Spectroscopy and Chemometric Analyses
- Scientific Research and Discoveries
- Solar Radiation and Photovoltaics
- Nuclear Materials and Properties
- Energy and Environment Impacts
- Infection Control and Ventilation
Indian Institute of Technology Kanpur
2016-2025
Paul Scherrer Institute
2024
Research Institute for Sustainability at GFZ
2022
Institute of Earth Environment
2020
Chinese Academy of Sciences
2020
Centre for Science and Environment
2016
Indian Institute of Technology Delhi
2012
Goddard Space Flight Center
2010-2011
Indian Institute of Technology Indore
2008-2011
University of California, Berkeley
2006
Aerosol optical properties and the spectral behavior of aerosol depth (AOD) over Kanpur, an urban‐industrial city in Ganga basin, have been presented for first time. Measurements by ground‐based Robotic Network (AERONET) during January 2001 to December 2003 show pronounced seasonal influence, with maximum dust loading premonsoon season (April–May). The distribution AOD is found be large a mean value 0.6 at 500 nm wavelength. frequency Ångström parameter α reveals two modes (α < 1 dominant...
Dust storms are considered natural hazards, which affect day‐to‐day life for a short time from few hours to days. They common in India especially the western Rajasthan Province, is covered by Thar Desert. In this paper, we present effects of dust events on aerosol parameters retrieved over Kanpur (located heart Indo‐Gangetic basin) ground‐based Aerosol Robotic Network (AERONET) measurements. The show strong seasonal variability region, with least spectral dependence optical depth (AOD)...
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...
Abstract. Low-cost particulate matter (PM) sensors are promising tools for supplementing existing air quality monitoring networks. However, the performance of new generation low-cost PM under field conditions is not well understood. In this study, we characterized capabilities a sensor model (Plantower PMS3003) measuring PM2.5 at 1 min, h, 6 12 and 24 h integration times. We tested PMS3003 in both low-concentration suburban regions (Durham Research Triangle Park (RTP), NC, US) with (mean ±...
Abstract. Black carbon, light-absorbing organic carbon (often called "brown carbon") and mineral dust are the major aerosols. Currently sources formation of brown aerosol in particular not well understood. In this study we estimated amount light–absorbing black from AERONET measurements. We find that columnar absorbing (brown carbon) levels biomass burning regions South America Africa relatively high (about 15–20 mg m−2 during season), while concentrations significantly lower urban areas US...
Abstract. The Surface PARTiculate mAtter Network (SPARTAN) is a long-term project that includes characterization of chemical and physical attributes aerosols from filter samples collected worldwide. This paper discusses the ongoing efforts SPARTAN to define quantify major ions trace metals found in fine particulate matter (PM2.5). Our methods infer spatial temporal variability PM2.5 cost-effective manner. Gravimetrically weighed filters represent multi-day averages PM2.5, with collocated...
Delhi, the capital of India, suffers from heavy local emissions as well regional transport air pollutants, resulting in severe aerosol loadings. To determine sources these we have quantified mass concentrations 26 elements airborne particles, measured by an online X-ray fluorescence spectrometer with time resolution between 30 min and 1 h. Measurements PM10 PM2.5 (particulate matter <10 μm < 2.5 μm) were conducted during two consecutive winters (2018 2019) Delhi. On average, Al to Pb made up...
During a comprehensive aerosol field campaign as part of ISRO‐GBP, extensive measurements black carbon were made during December 2004, for the first time, at Kanpur, an urban continental location in northern India. BC diurnal variation is associated with changes boundary layer mixing and anthropogenic activities. concentration Kanpur comparable to those measured other mega cities India but much higher than similar locations Europe, USA Asia. High found both absolute terms (6–20 μg m −3 )...
This study presents a comprehensive 1 year (January 2007–March 2008) data set on the chemical composition of ambient aerosols collected from an urban location (Kanpur) in Indo‐Gangetic Plain (IGP) and suggests that varying strength regional emission sources, boundary layer dynamics, formation secondary all contribute significantly to temporal variability mass concentrations elemental carbon (EC), organic (OC), water‐soluble OC (WSOC). On average, carbonaceous nearly one third PM 10 during...
Abstract. The Moderate Resolution Imaging Spectroradiometer (MODIS) onboard EOS Terra measures global aerosol optical depth and properties since 2000. MODIS products are freely available being used for numerous studies. In this paper, we present a comparison of (AOD) retrieved from with Aerosol Robotic Network (AERONET) data the year 2004 over Kanpur, an industrial city lying in Ganga Basin northern part India. AOD (τaMODIS) at 0.55µm wavelength has been compared AERONET derived (τaAERONET),...
The first simultaneous measurements and analytical data on atmospheric concentrations of PM(2.5), PM(10), inorganic constituents, carbonaceous species, their optical properties (aerosol depth, AOD; absorption coefficient, b(abs); mass efficiency, σ(abs); single scattering albedo, SSA) from an urban site (Kanpur) in the Indo-Gangetic Plain are reported here. Significantly high aerosol concentration (>100 μg m(-3)) AOD (> 0.3) seen as a characteristic feature throughout sampling period,...
High aerosol loading over the northern Indian subcontinent can result in poor air quality leading to human health consequences and climate perturbations. The international 2008 TIGERZ experiment intensive operational period (IOP) was conducted Indo \Gangetic Plain (IGP) around industrial city of Kanpur (26.51degN, 80.23deg E), India, during premonsoon (April-June). Aerosol Robotic Network (AERONET) Sun photometers performed frequent measurements properties at temporary sites distributed...
This paper attempts to characterize the physical and optical properties of aerosols along with relevant meteorological parameters at a typical location in Ganga basin. The emphasis is on delineating prolonged foggy/hazy conditions, phenomenon believed be relatively recent origin, faced by millions people during winter months December January. Collocated measurements number aerosol atmospheric were made using ground‐based instruments as part an intense field campaign launched under Indian...
Carbonaceous species, meteorological parameters, trace gases, and fogwater chemistry were measured during winter in the Indian city of Kanpur to study secondary organic aerosol (SOA) foggy clear (nonfoggy) days. Enhanced SOA production was observed fog episodes. It is hypothesized that aqueous phase drops responsible for increasing production. concentrations on days exceeded those at all times day; peak day evening vs which occurred afternoon. Changes biomass burning emissions examined...
Natural and anthropogenic aerosols over northern India play an important role in influencing the regional radiation budget, causing climate implications to overall hydrological cycle of South Asia. In context change air quality, we discuss aerosol loading variability trends at Kanpur AERONET station located central part Indo-Gangetic plains (IGP), during last decade (2001–10). Ground-based radiometric measurements show increase column-integrated optical depth (AOD) on a yearly basis. This...
Abstract. Sun/sky radiometer observations over the Indo-Gangetic Basin (IGB) region during pre-monsoon (from April–June 2009) have been processed to analyze various aerosol characteristics in central and eastern IGB region, represented by Kanpur Gandhi College, respectively, their impacts on climate terms of radiative forcing. Monthly mean optical depth (AOD at 500 nm) corresponding Angstrom Exponent (AE 440–870 nm, given within brackets) was observed be about 0.50 (0.49) 0.51 (0.65) April,...
We present 5‐year (2001–2005) monthly mean estimates of direct radiative effects (DRE) due to aerosols over Kanpur region in the Indo‐Gangetic basin for first time. Further, and annual heterogeneity aerosol DRE has been evaluated on basis anthropogenic natural contribution. An optically equivalent model formulated surface measurements, altitude profiles properties conjunction with remotely retrieved parameters, optical are used estimate at top‐of‐atmosphere (TOA), atmosphere shortwave (SW)...
Recent global models estimate that light absorption by brown carbon (BrC) in several regions of the world is ∼30–70% due to black (BC). It is, therefore, important understand its sources and characteristics on temporal spatial scales. In this study, we conducted semicontinuous measurements water-soluble organic (WSOC) BrC using particle-into-liquid sampler coupled with a liquid waveguide capillary cell total analyzer (PILS-LWCC-TOC) over Kanpur (26.5°N, 80.3°E, 142 m amsl) during winter...
Exposure to ambient fine particulate matter (PM2.5) is a leading risk factor for the global burden of disease. However, uncertainty remains about PM2.5 sources. We use chemical transport model (GEOS-Chem) simulation 2014, constrained by satellite-based estimates interpret globally dispersed mass and composition measurements from ground-based surface network (SPARTAN). Measured site mean varies substantially secondary inorganic aerosols (2.4–19.7 μg/m3), mineral dust (1.9–14.7...