A5025827006- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Climate variability and models
- Meteorological Phenomena and Simulations
- Methane Hydrates and Related Phenomena
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Spectroscopy and Laser Applications
- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Climate change and permafrost
- Geochemistry and Geologic Mapping
- Urban Heat Island Mitigation
- Soil Moisture and Remote Sensing
- Soil Geostatistics and Mapping
- Cryospheric studies and observations
- Geological Studies and Exploration
- Fire effects on ecosystems
- Air Quality Monitoring and Forecasting
- Geology and Paleoclimatology Research
- Arctic and Russian Policy Studies
- Carbon Dioxide Capture Technologies
- Building Energy and Comfort Optimization
- Research Data Management Practices
ARC Centre of Excellence for Climate System Science
2013-2019
UNSW Sydney
2011-2019
Australian Research Council
2013-2017
Harvard University
2009-2016
Laboratoire des Sciences du Climat et de l'Environnement
2005-2012
Université de Versailles Saint-Quentin-en-Yvelines
2006-2012
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2005-2012
Centre National de la Recherche Scientifique
2006-2012
Planetary Science Institute
2009-2011
Los Angeles Pierce College
2010
Abstract. We use a global chemical transport model (GEOS-Chem CTM) to interpret observations of black carbon (BC) and organic aerosol (OA) from the NASA ARCTAS aircraft campaign over North American Arctic in April 2008, as well longer-term records surface air snow (2007–2009). BC emission inventories for America, Europe, Asia are tested by comparison with these source regions. Russian open fires were dominant OA troposphere during but we find that was prevailingly anthropogenic (fossil fuel...
Abstract. We simulate nitrogen deposition over the US in 2006–2008 by using GEOS-Chem global chemical transport model at 1/2°×2/3° horizontal resolution North America and adjacent oceans. emissions of NOx NH3 are 6.7 2.9 Tg N a−1 respectively, including a 20% natural contribution for each. Ammonia factor 3 lower winter than summer, providing good match to network observations NHx (≡NH3 gas + ammonium aerosol) wet fluxes. Model comparisons observed fluxes surface air concentrations oxidized...
Abstract. The recent increase of atmospheric methane is investigated by using two inversions to quantify the distribution sources and sinks for 2006–2008 period, a process-based model emissions natural wetland ecosystems. Methane derived from are consistent at global scale: decreased in 2006 (−7 Tg) increased 2007 (+21 2008 (+18 Tg), as compared 1999–2006 period. agreement on latitudinal partition flux anomalies fair 2006, good 2007, not 2008. In positive anomaly tropical found be main...
Abstract. We determine enhancement ratios for NOx, PAN, and other NOy species from boreal biomass burning using aircraft data obtained during the ARCTAS-B campaign examine impact of these emissions on tropospheric ozone in Arctic. find an initial emission factor NOx 1.06 g NO per kg dry matter (DM) burned, much lower than previous observations plumes, also one third value recommended extratropical fires. Our analysis provides first observational confirmation rapid PAN formation a smoke...
Abstract. We use observations from the April 2008 NASA ARCTAS aircraft campaign to North American Arctic, interpreted with a global 3-D chemical transport model (GEOS-Chem), better understand sources and cycling of hydrogen oxide radicals (HOx≡H+OH+peroxy radicals) their reservoirs (HOy≡HOx+peroxides) in springtime Arctic atmosphere. find that standard gas-phase mechanism overestimates observed HO2 H2O2 concentrations. Computation HOx HOy budgets on basis also indicates large missing sink...
Abstract. We use aircraft observations of carbon monoxide (CO) from the NASA ARCTAS and NOAA ARCPAC campaigns in April 2008 together with multiyear (2003–2008) CO satellite data AIRS instrument a global chemical transport model (GEOS-Chem) to better understand sources, transport, interannual variability pollution Arctic spring. Model simulation gives best estimates emissions 26 Tg month−1 for Asian anthropogenic, 9.4 European 4.1 North American 15 Russian biomass burning (anomalously large...
We assess the impact of transport pollution from midlatitudes on abundance ozone in Arctic summer 2006 using GEOS‐Chem global chemical model and its adjoint. find that although midlatitude emissions abundances is at a maximum fall winter, July North America, Asia, Europe together contributed about 25% surface Arctic. Throughout summer, dominant source troposphere was photochemical production within Arctic, which accounted for more than 50% boundary layer as much 30%–40% middle troposphere....
Key Points Spatial variability in the land‐atmosphere coupling defines local heatwave sensitivity to antecedent land surface conditions Land‐driven regions experience a higher day frequency with temperatures sensitive prior soil moisture Antecedent anomaly rather than drying rate 2 weeks has longer impact on
Abstract. This paper presents an inverse method for inferring trace gas fluxes at high temporal (daily) and spatial (model grid) resolution from continuous atmospheric concentration measurements. The is designed regional applications use in intensive campaigns. We apply the to a one month inversion of over Europe. show that information added by measurements depends critically on smoothness constraint assumed among source components. initial condition affects 20 days, provided has enough...
Abstract. We developed an iterative inverse method to infer inter-annual sources and sinks of methyl chloroform (MCF) from atmospheric measurements, on a monthly basis. The methodology is presented used estimate two decades OH variability between 1980 2000, using varying meteorology. When concentrations are adjusted with loose prior errors MCF emissions within inventory bounds, we show that substantial (8.5±1.0% the mean) trend (−0.7%.yr-1) necessary match observations. This result confirmed...
The global chemical transport model GEOS‐Chem, implemented with a dust‐iron dissolution scheme, was used to analyze the magnitude and spatial distribution of mineral dust soluble‐iron (sol‐Fe) deposition South Atlantic Ocean (SAO). comparison results remotely sensed data shows that GEOS‐Chem can capture source regions in Patagonia characterize temporal variability outflow. For year‐long simulation, 22 Tg 4 Gg sol‐Fe were deposited surface waters entire SAO region, roughly 30% this predicted...
Abstract. We use the GEOS-Chem chemistry-transport model (CTM) to interpret spatial and temporal variations of tropical tropospheric CO observed by Microwave Limb Sounder (MLS) Tropospheric Emission Spectrometer (TES). In so doing, we diagnose evaluate transport in GEOS-4 GEOS-5 assimilated meteorological fields that drive model, with a particular focus on vertical mixing at end dry season when convection moves over source regions. The results indicate South America, deep both decays too low...
Abstract Leaf area index (LAI), the total one-sided surface of leaf per ground area, is a key component land models. The authors investigate influence differing, plausible LAI prescriptions on heat, moisture, and carbon fluxes simulated by Community Atmosphere Biosphere Land Exchange version 1.4b (CABLEv1.4b) model over Australian continent. A 15-member ensemble monthly dataset generated using Moderate Resolution Imaging Spectroradiometer (MODIS) product gridded observations temperature...
Abstract. We use the Global Modeling Initiative (GMI) modeling framework to assess utility of cosmogenic beryllium-7 (7Be), a natural aerosol tracer, for evaluating cross-tropopause transport in global models. The GMI chemical model (CTM) was used simulate atmospheric 7Be distributions using four different meteorological data sets (GEOS1-STRAT DAS, GISS II′ GCM, fvGCM, and GEOS4-DAS), featuring significantly stratosphere–troposphere exchange (STE) characteristics. simulations were compared...
This paper demonstrates an inversion of surface CO 2 fluxes using concentrations derived from assimilation satellite radiances. Radiances come the Atmospheric Infrared Sounder (AIRS) and are assimilated within system European Centre for Medium‐Range Weather Forecasts. We evaluate quality inverted by comparing simulated with independent airborne measurements. As a benchmark we use based on flask measurements another only global concentration trend. show that AIRS‐based is able to improve...
Abstract The authors use a sophisticated coupled land–atmosphere modeling system for Southern Hemisphere subdomain centered over southeastern Australia to evaluate differences in simulation skill from two different land surface initialization approaches. first approach uses equilibrated states obtained offline simulations of the model, and second reanalyses. find that using prior contribute relative gains subseasonal forecast skill. In particular, temperature 10%–20% within 30 days can be...
Australia’s Climate Simulator (ACCESS-NRI) is a national research infrastructure established to support the Australian Community and Earth System (ACCESS) modelling system. Since its launch in 2022, ACCESS-NRI has focused on modernising climate software data practices for ACCESS. Guided by needs of our community, goal make framework outputs more FAIR (Findable, Accessible, Interoperable, Reusable) easier use.   One key challenges achieving ACCESS reliance often...
There are very few large-scale observations of the chemical composition Siberian airshed. The Airborne Extensive Regional Observations in Siberia (YAKAEROSIB) French–Russian research program aims to fill this gap by collecting repeated aircraft high-precision measurements vertical distribution CO2, CO, O3, and aerosol size troposphere on a transect 4,000 km during campaigns lasting approximately one week. This manuscript gives an overview results from five executed April 2006, September...
Abstract. An inverse model using atmospheric CO2 observations from a European network of stations to reconstruct daily fluxes and their uncertainties over Europe at 40 km resolution has been developed within Bayesian framework. In this first part, pseudo-data experiment is performed assess the potential continuous measurements 10 AEROCARB project such as in 2001 (http://www.aerocarb.cnrs-gif.fr/). Under assumptions small observation noise perfect transport model, reconstruction particular...
Abstract. An inverse model using atmospheric CO2 observations from a European network of stations to reconstruct daily fluxes and their uncertainties over Europe at 50 km resolution has been developed within Bayesian framework. We use the pseudo-data approach in which we try recover known range perturbations input. In this study, focus is put on sensitivity flux accuracy setup, varying prior errors, errors stations. show that, under assumptions about error data can reliably scale 1000 10...
Abstract. We simulate nitrogen deposition over the US in 2006–2008 by using GEOS-Chem global chemical transport model at 1/2° × 2/3° horizontal resolution North America and adjacent oceans. emissions of NOx NH3 are 6.7 2.9 Tg N a−1 respectively, including a 20% natural contribution for each. Ammonia factor 3 lower winter than summer, providing good match to network observations NHx (≡NH3 gas + ammonium aerosol) wet fluxes. Model comparisons observed fluxes surface air concentrations oxidized...