A5086865721- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Climate variability and models
- Ionosphere and magnetosphere dynamics
- Meteorological Phenomena and Simulations
- Geology and Paleoclimatology Research
- Water Quality Monitoring and Analysis
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- Impact of Light on Environment and Health
- Internet Traffic Analysis and Secure E-voting
- Machine Learning in Healthcare
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
- Astronomical Observations and Instrumentation
- Evolution and Paleontology Studies
- Biomedical Text Mining and Ontologies
- Topic Modeling
- COVID-19 impact on air quality
Smithsonian Astrophysical Observatory
2007-2025
Center for Astrophysics Harvard & Smithsonian
2016-2025
Novartis (United States)
2024
Ocean University of China
2024
Guizhou University
2022-2023
Mitchell Institute
2023
Texas A&M University
2023
Sichuan Agricultural University
2021-2023
Fudan University
2023
Qingdao University
2023
The Tropospheric Ozone Assessment Report (TOAR) is an activity of the International Global Atmospheric Chemistry Project. This paper a component report, focusing on present-day distribution and trends tropospheric ozone relevant to climate global atmospheric chemistry model evaluation. Utilizing TOAR surface database, several figures present daytime average at 2702 non-urban monitoring sites, highlighting regions seasons world with greatest levels. Similarly, ozonesonde commercial aircraft...
Abstract. This overview paper highlights the successes of Ozone Monitoring Instrument (OMI) on board Aura satellite spanning a period nearly 14 years. Data from OMI has been used in wide range applications and research resulting many new findings. Due to its unprecedented spatial resolution, combination with daily global coverage, plays unique role measuring trace gases important for ozone layer, air quality, climate change. With operational very fast delivery (VFD; direct readout) near...
Abstract. Methane is a greenhouse gas emitted by range of natural and anthropogenic sources. Atmospheric methane has been measured continuously from space since 2003, new instruments are planned for launch in the near future that will greatly expand capabilities space-based observations. We review value current, future, proposed satellite observations to better quantify understand emissions through inverse analyses, global scale down point sources combination with suborbital (surface...
The Geostationary Environment Monitoring Spectrometer (GEMS) is scheduled for launch in February 2020 to monitor air quality (AQ) at an unprecedented spatial and temporal resolution from a geostationary Earth orbit (GEO) the first time. With development of UV–visible spectrometers sub-nm spectral sophisticated retrieval algorithms, estimates column amounts atmospheric pollutants (O3, NO2, SO2, HCHO, CHOCHO, aerosols) can be obtained. To date, all satellite missions monitoring have been low...
Abstract. Ozone profiles from the surface to about 60 km are retrieved Monitoring Instrument (OMI) ultraviolet radiances using optimal estimation technique. OMI provides daily ozone for entire sunlit portion of earth at a horizontal resolution 13 km×48 nadir position. The have sufficient accuracy in troposphere see perturbations caused by convection, biomass burning and anthropogenic pollution, track their spatiotemporal transport. However, achieve such it has been necessary calibrate...
From the earliest observations of ozone in lower atmosphere 19th century, both measurement methods and portion globe observed have evolved changed. These different uncertainties biases, data records differ with respect to coverage (space time), information content, representativeness. In this study, various datasets are reviewed selected for inclusion historical record background levels, based on relationship technique modern UV absorption standard, absence interfering pollutants,...
Abstract. We present and discuss the Smithsonian Astrophysical Observatory (SAO) formaldehyde (H2CO) retrieval algorithm for Ozone Monitoring Instrument (OMI) which is operational NASA OMI H2CO. The version of described here includes relevant changes with respect to one, including differences in reference spectra H2CO, fit O2–O2 collisional complex, updates high-resolution solar spectrum, use a model sector over remote Pacific Ocean normalize retrievals, an updated air mass factor (AMF)...
Nitrogen dioxide (NO2) at the ground level poses a serious threat to environmental quality and public health. This study developed novel, artificial intelligence approach by integrating spatiotemporally weighted information into missing extra-trees deep forest models first fill satellite data gaps increase availability 49% then derive daily 1 km surface NO2 concentrations over mainland China with full spatial coverage (100%) for period 2019–2020 combining measurements, tropospheric columns...
We present a new solar irradiance reference spectrum representative of minimum conditions between cycles 24 and 25. The Total Spectral Solar Irradiance Sensor-1 (TSIS-1) Hybrid Reference Spectrum (HSRS) is developed by applying modified spectral ratio method to normalize very high resolution line data the absolute scale TSIS-1 Monitor (SIM) CubeSat Compact SIM (CSIM). are Air Force Geophysical Laboratory ultraviolet balloon observations, ground-based Quality Assurance Ultraviolet...
Ozone profiles are derived from back scattered radiance spectra in the ultraviolet (289–339 nm) measured by Global Monitoring Experiment (GOME) using optimal estimation technique. Tropospheric Column (TCO) is directly known tropopause to divide stratosphere and troposphere. To optimize retrieval improve fitting precision needed for tropospheric ozone, we perform extensive wavelength radiometric calibrations forward model inputs. The a priori influence of retrieved TCO ∼15% tropics increases...
We present the first directly retrieved global distribution of tropospheric column ozone from Global Ozone Monitoring Experiment (GOME) ultraviolet measurements during December 1996 to November 1997. The retrievals clearly show signals due convection, biomass burning, stratospheric influence, pollution, and transport. They are capable capturing spatiotemporal evolution in response regional or short time‐scale events such as 1997–1998 El Niño event a 10–20 DU change within few days. displays...
Abstract. We present a new multispectral approach for observing lowermost tropospheric ozone from space by synergism of atmospheric radiances in the thermal infrared (TIR) observed IASI (Infrared Atmospheric Sounding Interferometer) and earth reflectances ultraviolet (UV) measured GOME-2 (Global Ozone Monitoring Experiment-2). Both instruments are onboard series MetOp satellites (in orbit since 2006 expected until 2022) their scanning capabilities offer global coverage every day, with...
The Geostationary Coastal and Air Pollution Events (GEO-CAPE) mission was recommended by the National Research Council's (NRC's) Earth Science Decadal Survey to measure tropospheric trace gases aerosols coastal ocean phytoplankton, water quality, biogeochemistry from geostationary orbit, providing continuous observations within field of view. To fulfill mandate address challenge put forth NRC, two GEO-CAPE Working Groups (SWGs), representing atmospheric composition color disciplines, have...
Emission of bromine from sea‐salt aerosol, frost flowers, ice leads, and snow results in the nearly complete removal surface ozone during Arctic spring. Regions enhanced total column BrO observed by satellites have traditionally been associated with these emissions. However, airborne measurements O 3 within convective boundary layer (CBL) ARCTAS ARCPAC field campaigns at times bear little relation to BrO. We show that locations numerous satellite “hotspots” spring are consistent observations...
Abstract Retrievals of sulfur dioxide (SO 2 ) from space‐based spectrometers are in a relatively early stage development. Factors such as interference between ozone and SO the retrieval algorithms often lead to errors retrieved values. Measurements Ozone Monitoring Instrument (OMI), Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY), Global Experiment‐2 (GOME‐2) satellite sensors, averaged over period several years, were used identify locations with elevated...
Abstract. We analyze the theoretical basis of three different methods to validate and intercompare satellite measurements atmospheric composition, apply them tropospheric ozone retrievals from Tropospheric Emission Spectrometer (TES) Ozone Monitoring Instrument (OMI). The first method (in situ method) uses in vertical profiles for absolute instrument validation; it is limited by sparseness data. second (CTM a chemical transport model (CTM) as an intercomparison platform; provides globally...
Abstract. Satellite remote sensing of the Earth's atmospheric composition usually samples irregularly in space and time, many applications require spatially temporally averaging satellite observations (level 2) to a regular grid 3). When level 2 data over long period target 3 that is significantly finer than sizes pixels, this process referred as “oversampling”. An agile, physics-based oversampling approach developed represent each observation sensitivity distribution on ground, instead...
Abstract. We examine the potential for global detection of methane plumes from individual point sources with new generation spaceborne imaging spectrometers (EnMAP, PRISMA, EMIT, SBG, CHIME) scheduled launch in 2019–2025. These instruments are designed to map Earth's surface at high spatial resolution (30 m×30 m) and have a spectral 7–10 nm 2200–2400 band that should also allow useful atmospheric methane. simulate scenes viewed by EnMAP (10 resolution, 180 signal-to-noise ratio) using...
Abstract. We present satellite based ozone profile estimates derived by combining radiances measured at thermal infrared (TIR) wavelengths from the Aura Tropospheric Emission Spectrometer (TES) and ultraviolet (UV) Ozone Monitoring Instrument (OMI). The advantage of using these combined instruments for sounding over either instrument alone is improved sensitivity near surface as well capability to consistently resolve lower troposphere, upper stratosphere scenes with varying geophysical...
Abstract. Nadir-viewing satellite observations of tropospheric ozone in the UV have been shown to some sensitivity boundary layer pollution episodes, but so far they not yet compared surface collected by large-scale monitoring networks. Here we use 2013–2017 data from China's new Ministry Ecology and Environment (MEE) network ∼ 1000 sites, together with vertical profiles ozonesondes aircraft, quantify ability retrievals Ozone Monitoring Instrument (OMI) detect China. We focus on summer when...