A5033108232- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Atmospheric and Environmental Gas Dynamics
- Spectroscopy and Laser Applications
- Social and Economic Development in India
- Impact of Light on Environment and Health
- Nuclear Physics and Applications
- Environmental Monitoring and Data Management
- Sulfur Compounds in Biology
- Geophysics and Gravity Measurements
- Vehicle emissions and performance
University of Leeds
2023-2025
University of Bremen
2019-2023
National Institute of Technology Calicut
2018
Centre National de la Recherche Scientifique
2001
Latitude Pharmaceuticals (United States)
2001
Université d'Orléans
2001
New York University
1948
Abstract. Megacities and other major population centres (MPCs) worldwide are sources of air pollution, both locally as well downwind. The overall assessment prediction the impact MPC pollution on tropospheric chemistry challenging. present work provides an overview highlights a new contribution to understanding this issue based data analysis EMeRGe (Effect transport transformation pollutants Regional Global scales) international project. focuses atmospheric chemistry, dynamics, local...
Air quality is an important issue to human health and the climate. Poor air has been proven be a risk factor in wide range of cardiovascular respiratory diseases, it contributes 6.9 million premature deaths worldwide [1]. also complex links climate change, with primary secondary pollutants affecting radiative forcing on Earth [2]. Therefore, accurate measurements pollutants, alongside understanding their emissions atmospheric sinks, crucial information for informing policy quality.Volatile...
Improving air quality is one of the main challenges in achieving a sustainable future. The mitigation strategies for and climate change require accurate knowledge both amount trace gases present atmosphere chemical processes involving these gases. primary removal mechanism species such as methane (CH4), volatile organic compounds (VOCs), NOx (NOx = NO + NO2) reaction with hydroxyl radical (OH), which leads to formation secondary pollutants ozone (O3) aerosol (SOA). Thus, understanding...
We describe the observation of NO3 radical using an incoherent broadband cavity-enhanced absorption spectrometer in open-path configuration (OP-IBBCEAS) a polluted summer environment continental China. The instrument was installed 17 m above ground at top residential complex near CAREBeijing–NCP 2014 site Wangdu, Hebei province, about 200 km southwest Beijing over period 28 to 30 June 2014. separation between transmitter and receiver components 335 cm effective pathlength clean reference air...
Abstract. Hydroperoxyl (HO2) and organic peroxy (RO2) radicals have an unpaired spin are highly reactive free radicals. Measurements of the sum HO2 RO2 provide unique information about chemical processing in air mass. This paper describes experimental features capabilities Peroxy Radical Chemical Enhancement Absorption Spectrometer (PeRCEAS). is instrument designed to make measurements on aircraft from boundary layer lower stratosphere. PeRCEAS combines amplified conversion nitrogen dioxide...
Abstract. EMeRGe (Effect of Megacities on the transport and transformation pollutants Regional to Global scales) is an international project focusing atmospheric chemistry, dynamics local regional pollution originating in megacities other major population centres (MPCs). Airborne measurements, taking advantage long range capabilities HALO research platform (High Altitude Long aircraft, www.halo-spp.de), are a central part project. In order provide adequate set measurements at different...
Simultaneous measurements of NO 3 , along with those O 2 and aerosol extinction coefficient, have been performed during the night by AMON instrument since 1992 at high midlatitudes SALOMON 1998 midlatitude. Observations are conducted using stellar lunar occultation methods, respectively. Vertical profiles obtained after inversion optical depth spectra recorded from 650 to 670 nm, including 662‐nm absorption line. Five midlatitude two latitude presented. Comparisons a box model constrained...
Abstract. In this study, airborne measurements of the sum hydroperoxyl (HO2) and organic peroxy (RO2) radicals that react with nitrogen monoxide (NO) to produce dioxide (NO2), coupled actinometry other key trace gases measurements, have been used test current understanding fast photochemistry in outflow major population centres. The were made during campaign EMeRGe (Effect Megacities on transport transformation pollutants Regional Global scales) project Europe board High Altitude Long Range...
Abstract. Hydroperoxyl, HO2, and organic peroxy, RO2, radicals are reactive short lived species, which play a key role in tropospheric chemistry. Measurements of the sum HO2 known as RO2*, provide unique information about chemical processing an air mass. This paper describes experimental features capabilities Peroxy Radical Chemical Enhancement Absorption Spectrometer (PeRCEAS). is instrument designed for use on aircraft from boundary layer to lower stratosphere. PeRCEAS combines amplified...
Abstract. In this study, airborne measurements of the sum hydroperoxyl (HO2) and organic peroxy (RO2) radicals that react with NO to produce NO2, i.e. RO2*, coupled actinometry other key trace gases measurements, have been used test current understanding fast photochemistry in outflow major population centres (MPCs). All were made during campaign EMeRGe (Effect Megacities on transport transformation pollutants Regional Global scales) project Europe on-board High Altitude Long range research...
Abstract Accurate knowledge of the Rayleigh scattering cross sections, σ Rayl , atmospheric gases as a function wavelength is required for radiate transfer calculations and also calibration optical systems e.g. high finesse cavities. The cavity ring-down spectroscopy (CRDS) highly accurate absolute method which enables experimentally determined to be compared with n-values calculated using refractive index. In this study, CRDS has been applied measure light extinction retrieve nitrogen, N 2...
Abstract Cavity ring-down spectroscopy (CRDS) has been applied to retrieve accurate Rayleigh scattering cross-sections, $${\upsigma }_{\mathrm{Rayl}.}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mi>Rayl</mml:mi> <mml:mo>.</mml:mo> </mml:mrow> </mml:msub> </mml:math> for a set of atmospheric gases at ~ 408 nm. Step pressure changes and ramps were used in three different but similar optical cavities measure light extinction by N 2 ,...
&lt;p&gt;Observations of tropospheric peroxy radicals are a key point for interpretation the processing and transformation polluted outflows from major populated centres (MPCs). A series European MPCs investigated by project EMeRGe (Effect Megacities on transport pollutants Regional Global scales). With this objective two airborne campaigns using research platform HALO (High Altitude LOng range aircraft) were carried out over Europe in summer 2017 east Asia intermonsoon period 2018....