A5001171408- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Meteorological Phenomena and Simulations
- Climate variability and models
- Atmospheric aerosols and clouds
- Odor and Emission Control Technologies
- Air Quality and Health Impacts
- Fire effects on ecosystems
- Urban Heat Island Mitigation
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Water Quality Monitoring and Analysis
- Vehicle emissions and performance
- Isotope Analysis in Ecology
- Cryospheric studies and observations
- Solidification and crystal growth phenomena
- Hydrocarbon exploration and reservoir analysis
- Ocean Waves and Remote Sensing
- Climate Change and Health Impacts
- Environmental Policies and Emissions
- Climate Change, Adaptation, Migration
- Phosphorus and nutrient management
- Satellite Image Processing and Photogrammetry
Université Libre de Bruxelles
2016-2025
Royal Meteorological Institute of Belgium
2024
China is a global hotspot of atmospheric ammonia (NH3) emissions and, as consequence, very high nitrogen (N) deposition levels are documented. However, previous estimates total NH3 in were much lower than inference from observed values would suggest, highlighting the need for further investigation. Here, we reevaluated based on mass balance approach, validated by N monitoring and satellite observations, period 2000 to 2015. Total increased 12.1 ± 0.8 Tg yr–1 15.6 0.9 2015 at an annual rate...
Abstract Excess atmospheric ammonia (NH 3 ) leads to deleterious effects on biodiversity, ecosystems, air quality and health, it is therefore essential monitor its budget temporal evolution. Hyperspectral infrared satellite sounders provide daily NH observations at global scale for over a decade. Here we use the version of Infrared Atmospheric Sounding Interferometer (IASI) dataset derive global, regional national trends from 2008 2018. We find worldwide increase 12.8 ± 1.3 % this 11-year...
Abstract. Recently, Whitburn et al.(2016) presented a neural-network-based algorithm for retrieving atmospheric ammonia (NH3) columns from Infrared Atmospheric Sounding Interferometer (IASI) satellite observations. In the past year, several improvements have been introduced, and resulting new baseline version, Artificial Neural Network IASI (ANNI)-NH3-v2.1, is documented here. One of main changes to that separate neural networks were trained land sea observations, in better training...
Abstract In this paper, we describe a new flexible and robust NH 3 retrieval algorithm from measurements of the Infrared Atmospheric Sounding Interferometer (IASI). The method is based on calculation spectral hyperspectral range index (HRI) subsequent conversion to columns via neural network. It an extension presented in Van Damme et al. (2014a) who used lookup tables (LUT) for radiance‐concentration conversion. inherits advantages LUT‐based while providing several significant improvements....
Abstract. Ammonia (NH3) is an essential reactive nitrogen species in the biosphere and through its use agriculture form of fertilizer (important for sustaining humankind). The current emission levels, however, are up to 4 times higher than previous century continue grow with uncertain consequences human health environment. While NH3 at levels a hazard environmental health, atmospheric budget still highly uncertain, which product overall lack measurements. capability measure satellites has...
We exploit 6 years of measurements from the Infrared Atmospheric Sounding Interferometer (IASI)/MetOp-A instrument to identify seasonal patterns and interannual variability atmospheric NH3. This is achieved by analyzing time evolution monthly mean NH3 columns in 12 subcontinental areas around world, simultaneously considering IASI morning evening overpasses. For most regions, has a sufficient sensitivity throughout capture columns, we show that each region characterized well-marked...
Abstract Aerosol is an important component of the Earth's atmosphere, affecting weather, climate, and diverse elements biosphere. Satellite sounders are essential tool for measuring highly variable distributions atmospheric aerosol. Here we present a new algorithm estimating dust optical depths associated retrieval uncertainties from spectral radiance measurements Infrared Atmospheric Sounding Interferometer (IASI). The based on calculation index neural network trained with synthetic IASI...
Abstract Retrieving concentrations of minor atmospheric trace gases from satellite observations is challenging due to their weak spectral signature. Here we present a new version the ANNI (Artificial Neural Network for Infrared Atmospheric Sounding Interferometer, IASI) retrieval framework, which relies on hyperspectral range index (HRI) quantification gas signature and an artificial feedforward neural network convert HRI into total column. We detail different steps method, especially where...
Abstract Satellite ammonia (NH 3 ) observations provide unprecedented insights into NH emissions, spatiotemporal variabilities and trends, but validation with in situ measurements remains lacking. Here, total columns from the Infrared Atmospheric Sounding Interferometer (IASI) were intercompared to boundary layer profiles derived aircraft‐ surface‐based primarily Colorado, USA, summer of 2014. IASI‐NH version near real‐time data set compared well (windows ±15 km around centroid, ±1 h...
Abstract. Concentrated agricultural activities and animal feeding operations in the northeastern plains of Colorado represent an important source atmospheric ammonia (NH3). The NH3 from these sources contributes to regional fine particle formation nitrogen deposition sensitive ecosystems Rocky Mountain National Park (RMNP), located ∼ 80 km west. In order better understand temporal spatial differences concentrations this region, weekly were measured at 14 locations during summers 2010 2015...
Abstract In the autumn of 2015, thousands square kilometers forest and peatlands in Indonesia went up flames. Among primary species emitted by fires, ammonia (NH 3 ) is special relevance for air quality. Here we derive daily total NH emission fluxes over affected area using satellite measurements years 2008–2015. The 2015 fires an estimated 1.4–8.2 Tg (with a maximum 0.06–0.33 d −1 ). On annual basis, emissions are factor 2–3 larger than previous 7 years. We factors peat soils, which found...
Abstract From 17–22 August 2017 simultaneous enhancements of ammonia (NH 3 ), carbon monoxide (CO), hydrogen cyanide (HCN), and ethane (C 2 H 6 ) were detected from ground‐based solar absorption Fourier transform infrared (FTIR) spectroscopic measurements at two high‐Arctic sites: Eureka (80.05°N, 86.42°W) Nunavut, Canada, Thule (76.53°N, 68.74°W), Greenland. These attributed to wildfires in British Columbia the Northwest Territories Canada using FLEXPART back‐trajectories fire locations...
Abstract. The Paris megacity experiences frequent particulate matter (i.e.PM2.5, with a diameter less than 2.5 µm) pollution episodes in spring (March–April). At this time of the year, large numbers particles consist ammonium sulfate and nitrate which are formed from ammonia (NH3) released during fertilizer spreading practices transported surrounding areas to Paris. There is still limited knowledge emission sources around Paris, their magnitude, seasonality. Using space-borne NH3 observation...
Monthly, high-resolution (∼2 km) ammonia (NH
Abstract The Arabian Peninsula exhibits extreme hot summers and has one of the world’s largest population growths. We use satellite observations reanalysis as well climate model projections to analyze morning evening land surface temperatures (LSTs), refer processes at surface, wet bulb (WBTs) measure human heat stress. focus on three regions: Persian Gulf Oman, inland capital Saudi Arabia, Riyadh irrigated agricultural region in Al-Jouf, Arabia. This study shows that time day is important...
Abstract. Satellite measurements play an increasingly important role in the study of atmospheric ammonia (NH3). Here, we present version 4 Artificial Neural Network for IASI (ANNI; IASI: Infrared Atmospheric Sounding Interferometer) retrieval NH3. The main change is introduction total column averaging kernels (AVKs), which can be used to undo effect vertical profile shape assumption retrieval. While equations matched term with analogous ones UV/Vis retrievals other minor absorbers, derive...
Abstract Satellite‐derived enhancement ratios of NH 3 relative to CO column burden ( ) in fires over Alaska, the Amazon, and South Equatorial Africa are 35, 45, 70% lower than corresponding ratio their emissions factors from biomass burning derived situ observations. Simulations performed using Geophysical Fluid Dynamics Laboratory AM3 global chemistry‐climate model show that these regional differences may not entirely stem an overestimate but rather changes gas‐aerosol partitioning ....
Abstract In a recent global analysis of satellite-derived atmospheric NH 3 data, hotspot was observed in the vicinity Lake Natron, Tanzania. The lake is centre an endorheic (limited drainage) basin and has shallow, saline-alkaline waters. Its remote location absence nearby large anthropogenic sources suggest that mainly natural origin. Here we explore 10 years IASI satellite data other publicly available datasets over area to characterize emissions this unique ecosystem. Temporal reveals are...
Tropical cyclone (TC) detection is essential to mitigate natural disasters, as TCs can cause significant damage life, infrastructure and economy. In this study, we applied the deep learning object model YOLOv3 detect in North Atlantic Basin, using data from Thermal InfraRed (TIR) Atmospheric Sounding Interferometer (IASI) onboard Metop satellites. IASI measures outgoing TIR radiation of Earth-Atmosphere. For first time, provide a proof concept possibility constructing images required by...
Abstract In recent years, major progress has been made in measuring weakly absorbing atmospheric trace gases from high spectral resolution space observations. this paper, we apply the so‐called whitening transformation on spectra of Infrared Atmospheric Sounding Interferometer, and show that it allows removing most climatological background spectra, leaving a residual contains those signatures depart normality. These can subsequently be attributed to changes abundance species. This is...
Abstract. Among the atmospheric emission sources, wildfires are episodic events characterized by large spatial and temporal variability. Therefore, accurate information on fire gaseous aerosol emissions for specific regions seasons is critical air quality forecasts. The Spinning Enhanced Visible Infrared Imager (SEVIRI) in geostationary orbit provides observations over Africa Mediterranean with a unique resolution of 15 min. It thus resolves complete life cycle captures fires' peak...
<title>Abstract</title> While the atmospheric concentrations of ozone-depleting chlorofluorocarbons (CFCs) are gradually declining following regulatory measures, levels other halogenated compounds, such as hydrochlorofluorocarbons (HCFCs) and sulfur hexafluoride (SF<sub>6</sub>), continue to rise or only just starting stabilize. These substances potent greenhouse gases. Their radiative efficiency, which quantifies along with their lifetime impact on climate, has until now been estimated...