A5000646354- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Planetary Science and Exploration
- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Air Quality and Health Impacts
- Spectroscopy and Laser Applications
- Spacecraft Design and Technology
- Wind and Air Flow Studies
- Spacecraft and Cryogenic Technologies
- Odor and Emission Control Technologies
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Isotope Analysis in Ecology
- Fire effects on ecosystems
- Climate variability and models
- Groundwater and Isotope Geochemistry
- Hydrology and Drought Analysis
- Hydrocarbon exploration and reservoir analysis
- Vehicle emissions and performance
- Water Quality Monitoring and Analysis
- Industrial Gas Emission Control
- Plant Water Relations and Carbon Dynamics
Environment and Climate Change Canada
2016-2025
Impact
2013
Atmospheric and Environmental Research
2002-2010
NOAA National Weather Service
2009
Joint Research Centre
2009
Howard University
2009
A primary component of the observed recent climate change is radiative forcing from increased concentrations long‐lived greenhouse gases (LLGHGs). Effective simulation anthropogenic by general circulation models (GCMs) strongly dependent on accurate representation processes associated with water vapor, ozone, and LLGHGs. In context increasing application Atmospheric Environmental Research, Inc. (AER), radiation within GCM community, their capability to calculate longwave shortwave for clear...
Abstract The collective representation within global models of aerosol, cloud, precipitation, and their radiative properties remains unsatisfactory. They constitute the largest source uncertainty in predictions climatic change hamper ability numerical weather prediction to forecast high-impact events. joint European Space Agency (ESA)–Japan Aerospace Exploration (JAXA) Earth Clouds, Aerosol Radiation Explorer (EarthCARE) satellite mission, scheduled for launch 2018, will help resolve these...
We describe the approach for estimation of atmospheric state, e.g., temperature, water, ozone, from calibrated, spectral radiances measured Tropospheric Emission Spectrometer (TES) onboard Aura spacecraft. The methodology is based on maximum a posteriori estimate, which mathematically requires minimization difference between observed and nonlinear model radiative transfer state subject to constraint that estimated must be consistent with an priori probability distribution state. techniques...
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...
The Tropospheric Emission Spectrometer (TES) on the Earth Observing System (EOS)‐Aura spacecraft measures global profiles of atmospheric ozone with vertical resolution 6–7 km in troposphere for nadir view. For a first validation TES measurements we have compared TES‐retrieved to ozonesondes from fall, 2004. In some cases ozonesonde data are dedicated launches timed match Aura overpass, while other comparisons performed routine available Southern Hemisphere Additional Ozonesonde (SHADOZ)...
Error covariances and vertical resolutions are reported for Tropospheric Emission Spectrometer (TES) nadir‐view retrievals of surface temperature, atmospheric H 2 O, O 3 , CO, CH 4 . These error computed as a result selecting spectral windows that maximize the information content simulated, TES four regions representative northern midlatitude, southern tropical, polar climates. The retrieval is function an priori posteriori covariance matrix where depends on estimated smoothing error,...
We present global, vertical profile estimates of the HDO/H 2 O ratio from Tropospheric Emission Spectrometer (TES) on Earth Observing System (EOS) Aura satellite. emphasize in this paper estimation approach and error characterization, which are critical to determining very small absolute concentration HDO relative H its uncertainty. These were made TES nadir‐viewing (downlooking) thermal infrared spectral radiances observed 20 September 2004. Profiles simultaneously estimated a is then...
Atmospheric ammonia (NH 3 ) has recently been observed with infrared sounders from space. Here we present 1 year of detailed bidaily satellite retrievals the Infrared Sounding Interferometer and some Tropospheric Emission Spectrometer over San Joaquin Valley, California, a highly polluted agricultural production region. Several sensitivity issues are discussed related to sounding ammonia, in terms degrees freedom, averaging kernels, altitude maximum relation thermal contrast concentration....
Abstract. Observations of atmospheric ammonia are important in understanding and modelling the impact on both human health natural environment. We present a detailed description robust retrieval algorithm that demonstrates capabilities utilizing Cross-track Infrared Sounder (CrIS) satellite observations to globally concentrations. Initial results using simulated real show (i) CrIS is sensitive boundary layer with peak vertical sensitivity typically around ~ 850–750 hPa (~ 1.5 2.5 km), which...
The Tropospheric Emission Spectrometer (TES) on the EOS Aura satellite makes global measurements of infrared radiances which are used to derive profiles species such as O 3 , CO, H 2 O, HDO and CH 4 routine standard products. In addition, TES has a variety special modes that provide denser spatial mapping over limited geographical area. A continuous‐coverage mode (called “transect”, about 460 km long) now been detect additional molecules indicative regional air pollution. On 10 July 2007 at...
Abstract. Presently only limited sets of tropospheric ammonia (NH3) measurements in the Earth's atmosphere have been reported from satellite and surface station measurements, despite well-documented negative impact NH3 on environment human health. Presented here is a detailed description retrieval strategy analysis for Tropospheric Emission Spectrometer (TES) using simulations measurements. These results show that: (i) level detectability representative boundary layer TES mixing ratio value...
Ammonia (NH 3 ) has significant impacts on biodiversity, eutrophication, and acidification. Widespread uncertainty in the magnitude seasonality of NH emissions hinders efforts to address these issues. In this work, we constrain U.S. sources using observations from TES satellite instrument with GEOS‐Chem model its adjoint. The inversion framework is first validated simulated observations. We then assimilate for April, July, October 2006 through 2009. adjoint‐based allows be adjusted...
Reactive nitrogen (Nr) is an essential nutrient to plants and a limiting element for growth in many ecosystems, but it can have harmful effects on ecosystems when excess. Satellite-derived surface observations are used together with dry deposition model estimate the flux of most abundant short-lived species, NH3 NO2, over North America during 2013 warm season. These fluxes demonstrate that contribution dominates NO2 regions (comprising ~85% their sum Canada ~65% U.S.), some regional...
Abstract. Bidirectional air–surface exchange of ammonia (NH3) has been neglected in many air quality models. In this study, we implement the bidirectional NH3 GEOS-Chem global chemical transport model. We also introduce an updated diurnal variability scheme for livestock emissions and evaluate recently developed MASAGE_NH3 bottom-up inventory. While improves comparison modeled-to-hourly situ measurements southeastern USA, concentrations decrease throughout globe, up to 17 ppb India China,...
Abstract. Despite its clear importance, the monitoring of atmospheric ammonia, including sources, sinks, and links to greater nitrogen cycle, remains limited. Satellite data are helping fill gap in from sporadic conventional ground- aircraft-based observations better inform policymakers assess impact any ammonia-related policies. Presented is a description survey that demonstrate capabilities Cross-track Infrared Sounder (CrIS) ammonia product for monitoring, air quality forecast model...
We develop an approach to estimate and characterize trace gas retrievals in the presence of clouds high spectral measurements upwelling radiance infrared region (650–2260 cm −1 ). The contribution is parameterized terms a set frequency‐dependent nonscattering optical depths cloud height. These parameters are retrieved jointly with surface temperature, emissivity, atmospheric gases such as ozone from data. demonstrate application this using data Tropospheric Emission Spectrometer (TES) test...
Comparisons of tropospheric carbon monoxide (CO) volume mixing ratio profiles and total columns are presented from nadir‐viewing measurements made by the Tropospheric Emission Spectrometer (TES) on NASA Aura satellite Measurements Pollution in Troposphere (MOPITT) instrument Terra satellite. In this paper, we first explore factors that relate retrieved true species profiles. We demonstrate at a given location time reported different teams can be very each other. influence priori data...
Abstract Research funded by the U.S. Department of Energy's Atmospheric Radiation Measurement (ARM) program has led to significant improvements in longwave radiative transfer modeling over last decade. These improvements, which have generally come small incremental changes, were made primarily water vapor self- and foreign-broadened continuum absorption line parameters. when taken as a whole, result up 6 W m−2 improvement modeled clear-sky downwelling flux at surface significantly better...
Collocated measurements of tropospheric ozone (O 3 ) and carbon monoxide (CO) from the Tropospheric Emission Spectrometer (TES) aboard EOS Aura satellite provide information on O ‐CO correlations to test our understanding global anthropogenic influence . We examine distribution TES in middle troposphere (618 hPa) for July 2005 compare generated with GEOS‐Chem chemical transport model ICARTT aircraft observations over eastern United States (July 2004). The data show significant downwind...
The Tropospheric Emission Spectrometer (TES) is a high-resolution spaceborne sensor that capable of observing tropospheric species. In order to exploit fully TES's potential for constituent retrievals, an accurate and fast operational forward model was developed TES. important component the TES retrieval model, Earth Limb Nadir Operational Retrieval (ELANOR), as it governs accuracy speed calculations retrievals. achieve necessary computational efficiency, adopted strategy utilizing...
Validation of Tropospheric Emission Spectrometer (TES) tropospheric CO profiles with in situ measurements from the Differential Absorption Measurement (DACOM) instrument during Intercontinental Chemical Transport Experiment (INTEX)‐B campaigns March to May 2006 are presented. For each identified DACOM profile, one three TES selected closest location small area that profile covers. The time differences between comparison within 2 hours. vertical adjusted by applying nearest coincident...
Abstract. Modern data assimilation algorithms depend on accurate infrared spectroscopy in order to make use of the information related temperature, water vapor (H2O), and other trace gases provided by satellite observations. Reducing uncertainties our knowledge spectroscopic line parameters continuum absorption is thus important improve application weather forecasting. Here we present results a rigorous validation updates an advanced radiative transfer model, Line-By-Line Radiative Transfer...