A5033722572- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Calibration and Measurement Techniques
- Carbon Nanotubes in Composites
- Fullerene Chemistry and Applications
- Spectroscopy and Laser Applications
- Atmospheric aerosols and clouds
- Graphene research and applications
- Vehicle emissions and performance
- Water Quality Monitoring and Analysis
- Scientific Measurement and Uncertainty Evaluation
- Geochemistry and Geologic Mapping
- Nanotechnology research and applications
- Synthesis and Properties of Aromatic Compounds
- Boron and Carbon Nanomaterials Research
- Spacecraft Design and Technology
- Advanced Statistical Process Monitoring
- Chemical Thermodynamics and Molecular Structure
- Phase Equilibria and Thermodynamics
- Adsorption, diffusion, and thermodynamic properties of materials
- Nanowire Synthesis and Applications
- Energetic Materials and Combustion
Royal Belgian Institute for Space Aeronomy
2015-2024
KU Leuven
2002-2008
IMEC
2008
Abstract Spaceborne NO 2 column observations from two high‐resolution instruments, Tropospheric Monitoring Instrument (TROPOMI) on board Sentinel‐5 Precursor and Ozone (OMI) Aura, reveal unprecedented decreases over China, South Korea, western Europe, the United States as a result of public health measures enforced to contain coronavirus disease outbreak (Covid‐19) in January–April 2020. The average drop all Chinese cities amounts −40% relative same period 2019 reaches up factor ~2 at...
Abstract. This paper reports on consolidated ground-based validation results of the atmospheric NO2 data produced operationally since April 2018 by TROPOspheric Monitoring Instrument (TROPOMI) board ESA/EU Copernicus Sentinel-5 Precursor (S5P) satellite. Tropospheric, stratospheric, and total column from S5P are compared to correlative measurements collected from, respectively, 19 Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS), 26 Network for Detection Atmospheric...
Abstract. Global observations of tropospheric nitrogen dioxide (NO2) columns have been shown to be feasible from space, but consistent multi-sensor records do not yet exist, nor are they covered by planned activities at the international level. Harmonised, multi-decadal NO2 and their associated uncertainties can provide crucial information on how emissions concentrations oxides evolve over time. Here we describe development a new, community best-practice retrieval algorithm based synthesis...
Abstract. We present EVAPORATION (Estimation of VApour Pressure ORganics, Accounting for Temperature, Intramolecular, and Non-additivity effects), a method to predict (subcooled) liquid pure compound vapour pressure p0 organic molecules that requires only molecular structure as input. The is applicable zero-, mono- polyfunctional molecules. A simple formula describe log10p0(T) employed, takes into account both wide temperature dependence the non-additivity functional groups. In order match...
Abstract. On board the Copernicus Sentinel-5 Precursor (S5P) platform, TROPOspheric Monitoring Instrument (TROPOMI) is a double-channel, nadir-viewing grating spectrometer measuring solar back-scattered earthshine radiances in ultraviolet, visible, near-infrared, and shortwave infrared with global daily coverage. In ultraviolet range, its spectral resolution radiometric performance are equivalent to those of predecessor OMI, but horizontal at true nadir improved by an order magnitude. This...
Abstract. Nitrogen dioxide (NO2) is one of the main data products measured by Tropospheric Monitoring Instrument (TROPOMI) on Sentinel-5 Precursor (S5P) satellite, which combines a high signal-to-noise ratio with daily global coverage and spatial resolution. TROPOMI provides valuable source information to monitor emissions from local sources such as power plants, industry, cities, traffic ships, variability these in time. Validation exercises NO2 v1.2–v1.3 data, however, have revealed that...
Abstract. The TROPOspheric Monitoring Instrument (TROPOMI), launched in October 2017 on board the Sentinel-5 Precursor (S5P) satellite, monitors composition of Earth's atmosphere at an unprecedented horizontal resolution as fine 3.5 × 5.5 km2. This paper assesses performances TROPOMI formaldehyde (HCHO) operational product compared to its predecessor, OMI (Ozone Instrument) HCHO QA4ECV product, different spatial and temporal scales. parallel development two algorithms favoured consistency...
Abstract. Remote sensing of atmospheric state variables typically relies on the inverse solution radiative transfer equation. An adequately characterized retrieval provides information uncertainties estimated as well how any constraint or a priori assumption affects estimate. Reported characterization data should be intercomparable between different instruments, empirically validatable, grid-independent, usable without detailed knowledge instrument technique, traceable and still have...
Abstract. Accurate knowledge of cloud properties is essential to the measurement atmospheric composition from space. In this work we assess quality data three Copernicus Sentinel-5 Precursor (S5P) TROPOMI products: (i) S5P OCRA/ROCINN_CAL (Optical Cloud Recognition Algorithm/Retrieval Information using Neural Networks;Clouds-As-Layers), (ii) OCRA/ROCINN_CRB (Clouds-as-Reflecting Boundaries), and (iii) FRESCO-S (Fast Retrieval Scheme for Clouds Oxygen absorption bands – Sentinel). Target are...
Abstract. The Sentinel-5P TROPOspheric Monitoring Instrument (TROPOMI) instrument, launched in October 2017, provides unique observations of atmospheric trace gases at a high resolution about 5 km, with near-daily global coverage, resolving individual sources like thermal powerplants, industrial complexes, fires, medium-scale towns, roads, and shipping routes. Even though (S5P) is mission, these datasets are especially well suited to test high-resolution regional-scale air quality (AQ)...
Abstract. The availability of formaldehyde (HCHO) (a proxy for volatile organic compound reactivity) and nitrogen dioxide (NO2) oxides) tropospheric columns from ultraviolet–visible (UV–Vis) satellites has motivated many to use their ratios gain some insights into the near-surface ozone sensitivity. Strong emphasis been placed on challenges that come with transforming what is being observed in column actually planetary boundary layer (PBL) near surface; however, little attention paid other...
Abstract. Ozone pollution is secondarily produced through a complex, non-linear chemical process. Our understanding of the spatiotemporal variations in photochemically ozone (i.e., PO3) limited to sparse aircraft campaigns and transport models, which often carry significant biases. Hence, we present novel satellite-derived PO3 product informed by bias-corrected TROPOspheric Monitoring Instrument (TROPOMI) HCHO, NO2, surface albedo data, various models. These data are integrated into...
We present BOREAM (Biogenic hydrocarbon Oxidation and Related Aerosol formation Model), a detailed model for the oxidation of α ‐pinene resulting secondary organic aerosol (SOA). It is based on quasi‐explicit gas phase mechanism primary products, developed objective grounds using advanced theoretical methods, simplified representation further products. The partitioning products follows kinetic with coefficients estimated from vapor pressures calculated dedicated group contribution method....
Abstract. The QA4ECV (Quality Assurance for Essential Climate Variables) version 1.1 stratospheric and tropospheric NO2 vertical column density (VCD) climate data records (CDRs) from the OMI (Ozone Monitoring Instrument) satellite sensor are validated using NDACC (Network Detection of Atmospheric Composition Change) zenith-scattered light differential optical absorption spectroscopy (ZSL-DOAS) multi-axis DOAS (MAX-DOAS) as a reference. VCDs have small bias ∼0.2 Pmolec.cm-2 (5 %–10 %)...
Abstract. Ozone in the troposphere affects humans and ecosystems as a pollutant greenhouse gas. Observing, understanding modelling this dual role, well monitoring effects of international regulations on air quality climate change, however, challenge measurement systems to operate at opposite ends spatio-temporal scale ladder. Aboard ESA/EU Copernicus Sentinel-5 Precursor (S5P) satellite launched October 2017, TROPOspheric Monitoring Instrument (TROPOMI) aspires take next leap forward by...
Abstract. We introduce the new ESA Climate Change Initiative TROPOspheric Monitoring Instrument (TROPOMI) global monthly Level 3 (L3) dataset of tropospheric nitrogen dioxide (NO2) for May 2018 to December 2021. The provides spatiotemporally averaged NO2 columns, associated averaging kernels and L3 uncertainties at spatial resolutions 0.2°, 0.5°, 1.0° on a timescale (https://doi.org/10.21944/CCI-NO2-TROPOMI-L3). To improve our understanding what fraction L2 uncertainty cancels when over...
Satellite instruments like OMI (2004) and TROPOMI (2018) have transformed global monitoring of tropospheric nitrogen dioxide (NO₂). Here we present a new Level 3 (L3) dataset produced within ESA’s CCI ECV project, created by averaging NO₂ columns spatially temporally. This compact, user-friendly is suitable for trend analysis, emission estimation, climate modeling validation. It includes (2004-2021) (2018-2021) data, uncertainty estimates, additional variables...
Abstract. The TROPOspheric Monitoring Instrument (TROPOMI), aboard the Sentinel-5 Precursor (S5P) satellite launched in October 2017, is dedicated to monitoring atmospheric composition associated with air quality and climate change. This paper presents global retrieval of TROPOMI tropospheric formaldehyde (HCHO) nitrogen dioxide (NO2) vertical columns using an updated version Peking University OMI NO2 (POMINO) algorithm, which focuses on improving calculation mass factors (AMFs). algorithm...
Abstract. In spite of the importance diacids and functionalised for organic aerosol formation through aqueous-phase processes in droplets water, there seems to be no reliable set experimental values their Henry's law constants (HLCs). We show that estimation use infinite dilution activity coefficients is also prone error. Here we present HLC hydroxy polyacids determined from solubilities, water activities vapour pressures solids or solutions, by employing thermodynamic relationships. The are...
Abstract. A new module for calculating the dry deposition of trace gases is presented and implemented in Model Atmospheric composition at Global Regional scales using Inversion Techniques Trace gas Emissions (MAGRITTE v1.0). The velocities are calculated Wesely's classical resistance-in-series approach. While relying on analyses European Centre Medium-range Weather Forecasts (ECMWF) meteorological fields, aerodynamic resistance calculation based ECMWF model equations turbulent transfer...
Abstract. The Sentinel-5P TROPOMI instrument, launched in October 2017, provides unique observations of atmospheric trace gases at a high resolution about 5 km with near-daily global coverage, resolving individual sources like thermal power plants, industrial complexes, fires, medium-scale towns, roads and shipping routes. Even though (S5P) is mission, these datasets are especially well suited to test high-resolution regional-scale air quality (AQ) models provide valuable input for emission...
Abstract. In orbit since late 2017, the Tropospheric Monitoring Instrument (TROPOMI) is offering new outstanding opportunities for better understanding emission and fate of nitrogen dioxide (NO2) pollution in troposphere. this study, we provide a comprehensive analysis spatio-temporal variability TROPOMI NO2 tropospheric columns (TrC-NO2) over Iberian Peninsula during 2018–2021, considering recently developed Product Algorithm Laboratory (PAL) product. We complement our with estimates NOx...
Abstract. The Sentinel-5 Precursor (S5P) satellite operated by the European Space Agency has carried TROPOspheric Monitoring Instrument (TROPOMI) on a Sun-synchronous low-Earth orbit since 13 October 2017. S5P mission acquired more than 5 years of TROPOMI nadir ozone profile data retrieved from level 0 to 1B processor version 2.0 and 2 optimal-estimation-based 2.4.0. latter is described in detail this work, followed geophysical validation resulting profiles for period May 2018 April 2023....
Abstract. Secondary organic aerosol (SOA) is a complex mixture of water and molecules. Its composition determined by the presence semi-volatile or non-volatile compounds, their saturation vapor pressure activity coefficient. The coefficient non-ideality effect function SOA composition. In previous publication, detailed chemical mechanism (DCM) for α-pinene oxidation subsequent formation BOREAM was presented. this work, we investigate with DCM impact simulating smog chamber experiments...
Abstract. We applied and compared seven vapor pressure estimation methods to the condensable compounds generated in oxidation of α-pinene, as described by state-of-the-art mechanism BOREAM model Capouet et al., 2008. Several these had be extended order treat functional groups such hydroperoxides peroxy acyl nitrates. Large differences estimated pressures are reported, which will inevitably lead large aerosol formation simulations. Cautioning remarks given for some methods.