A5034645197- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Wind and Air Flow Studies
- Air Quality and Health Impacts
- Methane Hydrates and Related Phenomena
- Meteorological Phenomena and Simulations
- Oil Spill Detection and Mitigation
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Oil, Gas, and Environmental Issues
- Arctic and Antarctic ice dynamics
- Climate variability and models
- Fluid Dynamics and Turbulent Flows
- Vehicle emissions and performance
- Particle Dynamics in Fluid Flows
- Ocean Acidification Effects and Responses
- Marine Bivalve and Aquaculture Studies
- Climate change and permafrost
- Arctic and Russian Policy Studies
- Marine and coastal plant biology
- Spectroscopy and Laser Applications
- Environmental Impact and Sustainability
- Risk and Safety Analysis
- Hydrocarbon exploration and reservoir analysis
Kjeller Innovasjon (Norway)
2018-2025
NILU
2015-2024
Japan Agency for Marine-Earth Science and Technology
2010-2019
Sorbonne Université
2009-2012
Laboratoire atmosphères, milieux, observations spatiales
2009-2012
Institut Pierre-Simon Laplace
2008-2012
Centre National de la Recherche Scientifique
2009-2012
University of Cambridge
2009-2012
Laboratoire de Météorologie Dynamique
2005-2010
Université de Versailles Saint-Quentin-en-Yvelines
2010
Abstract. The Lagrangian particle dispersion model FLEXPART in its original version the mid-1990s was designed for calculating long-range and mesoscale of hazardous substances from point sources, such as those released after an accident a nuclear power plant. Over past decades, has evolved into comprehensive tool multi-scale atmospheric transport modeling analysis attracted global user community. Its application fields have been extended to large range gases aerosols, e.g., greenhouse gases,...
Abstract. The Lagrangian particle dispersion model FLEXPART was originally designed for calculating long-range and mesoscale of air pollutants from point sources, such that occurring after an accident in a nuclear power plant. In the meantime, has evolved into comprehensive tool atmospheric transport modeling analysis at different scales. A need further multiscale encouraged new developments FLEXPART. this paper, we present version works with Weather Research Forecasting (WRF) meteorological...
The amount of methane released to the atmosphere from Nord Stream subsea pipeline leaks remains uncertain, as reflected in a wide range estimates1–18. A lack information regarding temporal variation atmospheric emissions has made it challenging reconcile volumetric (bottom-up) estimates1–8 with measurement-based (top-down) estimates8–18. Here we simulate rupture emission rates and integrate these dissolution sea-surface outgassing estimates9,10 model evolution leaks. We verify our modelled...
Abstract Atmospheric measurements show an increase in CH 4 from the 1980s to 1998 followed by a period of near‐zero growth until 2007. However, 2007, has increased again. Understanding variability is critical for climate prediction and change mitigation. We examine role sources dominant sink, oxidation hydroxyl radical (OH), atmospheric over past three decades using observations , C 2 H 6 δ 13 CH4 inversion. From 2006 2014, microbial fossil fuel emissions 36 ± 12 15 8 Tg y −1 respectively....
Abstract We find that summer methane (CH 4 ) release from seabed sediments west of Svalbard substantially increases CH concentrations in the ocean but has limited influence on atmospheric levels. Our conclusion stems complementary measurements at seafloor, ocean, and atmosphere land‐based, ship aircraft platforms during a campaign 2014. detected high dissolved above seafloor with sharp decrease pycnocline. Model approaches taking potential emissions both bubble‐released larger region into...
Abstract Black carbon emitted by incomplete combustion of fossil fuels and biomass has a net warming effect in the atmosphere reduces albedo when deposited on ice snow; accurate knowledge past emissions is essential to quantify model associated global climate forcing. Although bottom-up inventories provide historical Carbon emission estimates that are widely used Earth System Models, they poorly constrained observations prior late 20th century. Here we use an objective inversion technique...
Abstract. Oceanic emissions of halogenated very short-lived substances (VSLS) are expected to contribute significantly the stratospheric halogen loading and therefore ozone depletion. The amount VSLS transported into stratosphere is estimated based on in-situ observations around tropical tropopause layer (TTL) modeling studies which mostly use prescribed global emission scenarios reproduce observed atmospheric concentrations. In addition upper-air measurements, direct oceanic available along...
Abstract. The Lagrangian particle dispersion model FLEXPART was in its original version the mid-1990s designed for calculating long-range and mesoscale of hazardous substances from point sources, such as released after an accident a nuclear power plant. Over past decades, has evolved into comprehensive tool multi-scale atmospheric transport modelling analysis attracted global user community. Its application fields have been extended to large range gases aerosols, e.g. greenhouse gases,...
<p>Following its release and corresponding publication in GMD, we present the Lagrangian model FLEXPART 10.4, which simulates transport, diffusion, dry wet deposition, radioactive decay first order chemical reactions of atmospheric tracers. The has been recently updated, both technical representation physico-chemical processes.<span> </span></p><p>FLEXPART was original version mid-1990s designed for...
Abstract. The oil and gas (O&G) sector is a significant source of methane (CH4) emissions. Quantifying these emissions remains challenging, with many studies highlighting discrepancies between measurements inventory-based estimates. In this study, we present CH4 emission fluxes from 21 offshore O&G facilities collected in 10 fields over two regions the Norwegian continental shelf 2019. Emissions derived during 13 aircraft surveys were found to range 2.6 1200 t yr−1 (with mean...
Abstract. Ozone and nitrous oxide are measured at high spatial temporal resolution by instruments flying on the ER-2 NASA research aircraft. Comparing airborne transects to reconstructions ensemble of diffusive backward trajectories allows estimation average vertical Lagrangian turbulent diffusion experienced air parcels. The resulting estimates show large order 0.1in surf zone outside polar vortex smaller values 0.01 inside. Locally, variation occurs over mesoscale distances. It is found...
Abstract. Existing Lagrangian particle dispersion models are capable of establishing source–receptor relationships by running either forward or backward in time. For receptor-oriented studies such as interpretation "point" measurement data, simulations can be computationally more efficient several orders magnitude. However, to date, the modelling capabilities have been limited atmospheric concentrations mixing ratios. In this paper, we extend technique substances deposited at Earth's surface...
Abstract. Numerical methods and simulation codes are essential for the advancement of our understanding complex atmospheric processes. As technology computer hardware continue to evolve, development sophisticated code is vital accurate efficient simulations. In this paper, we present recent advancements made in FLEXPART, a Lagrangian particle dispersion model, which has been used wide range transport studies over past three decades, extending from tracing radionuclides Fukushima nuclear...
Abstract. Satellite instruments for measuring atmospheric column mixing ratios have improved significantly over the past couple of decades with increases in pixel resolution and accuracy. As a result, satellite observations are being increasingly used inversions to improve estimates emissions greenhouse gases (GHGs), particularly CO2 CH4, constrain regional national emission budgets. However, order make use increasing inversions, transport models need be able represent at these finer...
EYE-CLIMA is a Horizon Europe project that aims to improve estimates of emissions climate forcers (CO2, CH4, N2O, SF6, HFCs, and black carbon aerosols) by using atmospheric observations. Atmospheric observations can be used, with the help an transport model, in statistical optimization framework estimate surface-to-atmosphere fluxes – method known as inversion. These used national sub-national (and removals) support monitoring reporting ultimately Global Stocktake process.One main...
Black carbon (BC) is a significant climate forcer and major health hazard especially close to its sources. BC has both natural (e.g., wildfires) anthropogenic sources industry, traffic, oil gas industries). Its distribution in the atmosphere highly inhomogeneous. Understanding spatial magnitude of emissions critical for accurate modeling. However, emission inventories are fraught with uncertainties, largely stemming from uncertainties factors, which complicate global scale modeling efforts....
Black Carbon (BC) is an important aerosol species with a strong positive radiative forcing and severe health impacts. In the last decades, enforcement of European air quality policies has reduced ambient levels altered composition, implications on aerosol-radiation interaction. Therefore, comprehensive BC emission inventory needed for good understanding associated climate feedback. It also critical to minimize uncertainty in predicting current future influence BC. Under Horizon Europe...
Abstract. At present, anthropogenic halogens and oceanic emissions of very short-lived substances (VSLSs) both contribute to the observed stratospheric ozone depletion. Emissions long-lived have been reduced are currently declining, whereas biogenic VSLSs expected increase in future climate due activities affecting production emissions. Here, we introduce a new approach for assessing impact halocarbons on by calculating their depletion potential (ODP)-weighted Seasonally spatially dependent,...
Abstract. To mitigate the rumen enteric methane (CH4) produced by ruminant livestock, Asparagopsis taxiformis is proposed as an additive to feed. During cultivation of in sea or terrestrially based systems, this macroalgae, like most seaweeds and phytoplankton, produces a large amount bromoform (CHBr3), which contributes ozone depletion once released into atmosphere. In study, we focus on impact CHBr3 stratospheric layer resulting from potential emissions Australia. The assessed weighting...
The dispersion and mixing of pollutant plumes during long‐range transport across the North Atlantic is studied using ensembles diffusive backward trajectories in order to estimate turbulent diffusivity coefficients free troposphere under stratified flow conditions. Values 0.3–1 m 2 s −1 1 × 10 4 for vertical horizontal D v h , respectively, are derived. Uncertainties related method discussed, results compared with previous estimates atmospheric rates. These also yield an vertical/horizontal...
Abstract. We present trajectory-based estimates of Ozone Depletion Potentials (ODPs) for very short-lived halogenated source gases as a function surface emission location. The ODPs are determined by the fraction gas and its degradation products which reach stratosphere, depending primarily on tropospheric transport chemistry, effect resulting reactive halogen in is stratospheric particular residence time. Reflecting different timescales physico-chemical processes troposphere based...
Abstract. The EU HIBISCUS project consisted of a series field campaigns during the intense convective summers in 2001, 2003 and 2004 State São Paulo Brazil. Its objective was to investigate impact deep convection on Tropical Tropopause Layer (TTL) lower stratosphere by providing new set observational data meteorology, tracers horizontal vertical transport, water vapour, clouds, chemistry tropical Upper Troposphere/Lower Stratosphere (UT/LS). This achieved using short duration research...
Abstract. Carbonaceous aerosol (total carbon, TCp) was source apportioned at nine European rural background sites, as part of the Measurement and Evaluation Programme (EMEP) Intensive Periods in fall 2008 winter/spring 2009. Five predefined fractions were based on ambient measurements: elemental organic from combustion biomass (ECbb OCbb) fossil-fuel (ECff OCff) sources, remaining non-fossil carbon (OCrnf), dominated by natural sources. OCrnf made a larger contribution to TCp than...