A5012368567- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Cryospheric studies and observations
- Climate change and permafrost
- Air Quality Monitoring and Forecasting
- Methane Hydrates and Related Phenomena
- Spectroscopy and Laser Applications
- Atmospheric aerosols and clouds
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Hydrocarbon exploration and reservoir analysis
- Fire effects on ecosystems
- Odor and Emission Control Technologies
- Isotope Analysis in Ecology
- Water Quality Monitoring and Analysis
- Ionosphere and magnetosphere dynamics
- Climate variability and models
- Spectroscopy and Chemometric Analyses
- COVID-19 impact on air quality
- Winter Sports Injuries and Performance
- Geochemistry and Geologic Mapping
- Air Quality and Health Impacts
- Geophysics and Gravity Measurements
- Geological and Geophysical Studies Worldwide
Université Libre de Bruxelles
2017-2025
Forschungszentrum Jülich
2017-2021
University of Liège
2009-2019
Sociedade Brasileira de Educação Matemática
2016
Universidade Federal do Pampa
2016
Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul
2015
Joint Research Center
2013
Institut de Recherche pour le Développement
2003
Abstract. To estimate the sea level rise (SLR) originating from changes in surface mass balance (SMB) of Greenland ice sheet (GrIS), we present 21st century climate projections obtained with regional model MAR (Modèle Atmosphérique Régional), forced by output three CMIP5 (Coupled Model Intercomparison Project Phase 5) general circulation models (GCMs). Our results indicate that a warmer climate, gain increased winter snowfall over GrIS does not compensate loss through meltwater run-off...
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 Atmospheric acidity is increasingly determined by carbon dioxide and organic acids 1–3 . Among the latter, formic acid facilitates nucleation of cloud droplets 4 contributes to clouds rainwater 1,5 At present, chemistry–climate models greatly underestimate atmospheric burden acid, because key processes related its sources sinks remain poorly understood 2,6–9 Here we present chamber experiments that show formaldehyde efficiently converted gaseous via a multiphase pathway involves...
Sharp rises in the atmospheric abundance of ethane (C2H6) have been detected from 2009 onwards Northern Hemisphere as a result unprecedented growth exploitation shale gas and tight oil reservoirs North America. Using time series C2H6 total columns derived ground-based Fourier transform infrared (FTIR) observations made at five selected Network for Detection Atmospheric Composition Change sites, we characterize recent evolution determine rates ∼5% yr−1 mid-latitudes ∼3% remote sites. Results...
Abstract. The chemistry–climate model ECHAM-HAMMOZ contains a detailed representation of tropospheric and stratospheric reactive chemistry state-of-the-art parameterizations aerosols using either modal scheme (M7) or bin (SALSA). This article describes evaluates the version ECHAM6.3-HAM2.3-MOZ1.0 with focus on gas-phase chemistry. A 10-year simulation was performed to test stability provide data for its evaluation. comparison observations concentrates year 2008 includes total column ozone CO...
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. An updated and expanded representation of organics in the chemistry general circulation model EMAC (ECHAM5/MESSy for Atmospheric Chemistry) has been evaluated. First, comprehensive Mainz Organic Mechanism (MOM) submodel MECCA (Module Efficiently Calculating Chemistry Atmosphere) was activated with explicit degradation organic species up to five carbon atoms a simplified mechanism larger molecules. Second, ORACLE (version 1.0) now considers condensation on aerosols all mechanism....
Abstract. With the aim to force an ice dynamical model, Greenland sheet (GrIS) surface mass balance (SMB) was modelled at different spatial resolutions (15–50 km) for period 1990–2010, using regional climate model MAR (Modèle Atmosphérique Régional) forced by ERA-INTERIM reanalysis. This comparison revealed that (i) inter-annual variability of SMB components is consistent within investigated, (ii) simulates heavier precipitation on average over GrIS with decreasing resolution, and (iii)...
Abstract. In this study, simulations at 25 km resolution are performed over the Greenland ice sheet (GrIS) throughout 20th and 21st centuries, using regional climate model MAR forced by four RCP scenarios from three CMIP5 global circulation models (GCMs), in order to investigate projected changes of surface energy balance (SEB) components driving melt. Analysis 2000–2100 melt anomalies compared results 1980–1999 reveals an exponential relationship GrIS rate simulated near-surface air...
Abstract Recent measurements over the Northern Hemisphere indicate that long‐term decline in atmospheric burden of ethane (C 2 H 6 ) has ended and abundance increased dramatically between 2010 2014. The rise C abundances been attributed to oil natural gas extraction North America. Existing global emission inventories are based on outdated activity maps do not account for current exploitation regions. We present an updated inventory satellite‐derived CH 4 fluxes with adjusted emissions U.S....
Abstract Formic (HCOOH) and acetic acids ( COOH) are the most abundant carboxylic in Earth's atmosphere key compounds to aqueous‐phase chemistry. Here we present first distributions of COOH retrieved from 2007–2018 satellite observations nadir‐looking infrared atmospheric sounding interferometer (IASI), using a neural network‐based retrieval approach. A joint analysis with IASI HCOOH product reveals that two species exhibit similar distributions, seasonality, burden, pointing major common...
Abstract Volatile organic compounds are emitted abundantly from a variety of natural and anthropogenic sources. However, in excess, they can severely degrade air quality. Their fluxes currently poorly represented inventories due to lack constraints global measurements. Here, we track space over 300 worldwide hotspots ethylene, the most abundant industrially produced compound. We identify specific emitters associated with petrochemical clusters, steel plants, coal-related industries,...
Abstract. As an ubiquitous product of the oxidation many volatile organic compounds (VOCs), formaldehyde (HCHO) plays a key role as short-lived and reactive intermediate in atmospheric photo-oxidation pathways leading to formation tropospheric ozone secondary aerosols. In this study, HCHO profiles have been successfully retrieved from ground-based Fourier transform infrared (FTIR) solar spectra UV-visible Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) scans recorded...
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 Extreme enhancements in the total columns of carbon monoxide (CO), peroxyacetyl nitrate (PAN), ethylene (C 2 H 4 ), methanol (CH 3 OH), and formic acid (HCOOH) were observed over Canadian high Arctic during period 17–22 August 2017 by a ground‐based Fourier transform infrared (FTIR) spectrometer at Eureka, Nunavut (80.05°N, 86.42°W), Infrared Atmospheric Sounding Interferometer (IASI) satellite instruments. These have been attributed to wildfires British Columbia (BC) Northwest...
Abstract. Nitrous acid (HONO) is a key atmospheric component, acting as major source of the hydroxyl radical (OH), primary oxidant in Earth's atmosphere. However, understanding its spatial and temporal variability remains significant challenge. Recent TROPOspheric Monitoring Instrument (TROPOMI)/Sentinel-5 Precursor (S5P) ultraviolet–visible (UV–Vis) measurements fresh fire plumes shed light on impact global pyrogenic HONO emissions. Here, we leverage Infrared Atmospheric Sounding...
Abstract. We report future projections of Surface Mass Balance (SMB) over the Greenland ice sheet (GrIS) obtained with regional climate model MAR, forced by outputs three CMIP5 General Circulation Models (GCMs) when considering two different warming scenarios (RCP 4.5 and RCP 8.5). The GCMs selected in this study have been chosen according to their ability simulate current Greenland. Our results indicate that a warmer (i) mass gained due increased precipitation GrIS does not compensate lost...
Abstract. We present a retrieval method for ammonia (NH3) total columns from ground-based Fourier transform infrared (FTIR) observations. Observations Bremen (53.10° N, 8.85° E), Lauder (45.04° S, 169.68° Réunion (20.9° 55.50° E) and Jungfraujoch (46.55° 7.98° were used to illustrate the capabilities of method. NH3 mean ranging 3 orders magnitude obtained, with higher values at (mean 13.47 × 1015 molecules cm−2) lower 0.18 cm−2). In conditions high surface concentrations ammonia, as in...
Abstract. This paper studies the seasonal variation of surface and column CO at three different sites (Paris, Jungfraujoch Wollongong), with an emphasis on establishing a link between vertical distribution nature emission sources. We find first evidence time lag free tropospheric variations in Northern Hemisphere. The variability obtained from total columns partial shows maximum around March–April minimum September–October Hemisphere (Paris Jungfraujoch). In Southern (Wollongong) this is...
Abstract As one of the most abundant oxygenated volatile organic compounds in atmosphere, acetone (CH 3 C[O]CH ) influences atmospheric oxidants levels and ozone formation. Here we report first unambiguous identification from nadir‐viewing satellite sounder Infrared Atmospheric Sounding Interferometer (IASI). Via a neural network‐based retrieval approach that was previously applied to other weak absorbers, obtain daily global retrievals. A intercomparison with independent measurements is...