A5057482317- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Atmospheric chemistry and aerosols
- Infrared Target Detection Methodologies
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Remote-Sensing Image Classification
- Climate variability and models
- Statistical and numerical algorithms
- Spectroscopy and Laser Applications
- Remote Sensing in Agriculture
- Astronomical Observations and Instrumentation
- Satellite Image Processing and Photogrammetry
- Water Quality Monitoring and Analysis
- Inertial Sensor and Navigation
- Digital Image Processing Techniques
- COVID-19 and healthcare impacts
- Graph Theory and Algorithms
- Color Science and Applications
- Astrophysics and Cosmic Phenomena
- Urban Heat Island Mitigation
- Digital Filter Design and Implementation
Langley Research Center
2011-2025
National Aeronautics and Space Administration
2024
Science Systems and Applications (United States)
2009-2021
University of British Columbia
2002-2020
Support Systems Associates (United States)
2018-2019
The Single Field of View (SFOV) ozone (O3) profiles derived from the Cross-track Infrared Sounder (CrIS) onboard Suomi National Polar-Orbiting Partnership (SNPP), with a high horizontal resolution approximately 14 km at nadir and good sensitivity to O3 in upper troposphere lower stratosphere (UTLS), provide prominent opportunity examine (STT) transport. A process-oriented analysis was performed fine-scale features stratospheric intrusion (SI) event on June 11–13, 2017 southwestern US using...
Abstract. The Infrared Atmospheric Sounding Interferometer (IASI) is an ultra-spectral satellite sensor with 8461 spectral channels. IASI spectra contain high information content on atmospheric, cloud, and surface properties. instrument presents a challenge for using thousands of channels in physical retrieval system or Numerical Weather Prediction (NWP) data assimilation system. In this paper we describe method simultaneously retrieving atmospheric temperature, moisture, cloud properties...
A fast and accurate principal component-based radiative transfer model in the solar spectral region (PCRTM-SOLAR) has been developed. The algorithm is capable of simulating reflected spectra both clear sky cloudy atmospheric conditions. Multiple scattering beam by multilayer clouds aerosols are calculated using a discrete ordinate scheme. PCRTM-SOLAR can be trained to simulate top-of-atmosphere radiance or reflectance with resolution ranging from 1 cm-1 few nanometers. Broadband radiances...
Abstract Data from hyperspectral infrared sounders are routinely ingested worldwide by the National Weather Centers. The cloud‐free fraction of this data is used for initializing forecasts which include temperature, water vapor, cloud, and ice cloud profiles on a global grid. Although these sensitive to vertical distribution liquid in clouds, information not fully utilized. In future, could be validating clouds Center models forecasts. We evaluate how well calculated radiances Radiative...
Abstract The Climate Absolute Radiance and Refractivity Observatory (CLARREO) Pathfinder (CPF) mission is set to launch an SI‐traceable reflective solar (RS) spectrometer aboard the International Space Station measure Earth‐reflected radiation with a radiometric uncertainty of 0.3%–0.6% ( k = 1). This paper introduces fast accurate spectral extension algorithm designed expand CPF‐like radiances beyond CPF range (0.35–2.3 μm) align CERES SW for its filtered (0.2–5 unfiltered (0.2–15.0...
Abstract. One-dimensional variational retrievals of temperature and moisture fields from hyperspectral infrared (IR) satellite sounders use cloud-cleared radiances (CCRs) as their observation. These derived observations allow the clear-sky-only radiative transfer in inversion for geophysical variables but at reduced spatial resolution compared to native sounder observations. Cloud clearing can introduce various errors, although scenes with large errors be identified ignored. Information...
The Climate Absolute Radiance and Refractivity Observatory (CLARREO) Pathfinder (CPF) mission consists of a high accuracy reflected solar spectrometer that will take measurements from the International Space Station for one year starting in 2023. CPF demonstrate its novel on-orbit absolute calibration approaches are capable achieving 0.3% (1-sigma) radiometric uncertainty. Additionally, using two-axis pointing gimbal which enables nearly-concurrent matching look angles with other orbiting...
This paper applies a physical inversion approach to retrieve geophysical properties from the single instrumental field-of-view (FOV) spectral radiances measured by Infrared Atmospheric Sounding Interferometer (IASI) under all-sky conditions. We demonstrate use of principal-component-based radiative transfer model (PCRTM) and methodology simultaneously cloud microphysical along with atmospheric thermodynamic parameters. By using fast parameterization scheme, PCRTM can include scattering...
Detecting climate trends of atmospheric temperature, moisture, cloud, and surface temperature requires accurately calibrated satellite instruments such as the Climate Absolute Radiance Reflectivity Observatory (CLARREO). Wielicki et al. have studied CLARREO measurement requirements for achieving change accuracy goals in orbit. Our study further quantifies spectrally dependent IR instrument calibration requirement detecting moisture profiles. The water vapor, skin variability associated...
A cold air outbreak (CAO) is an extreme weather phenomenon that has significant social and economic impacts over a large region of the midlatitudes. However, dynamical mechanism occurrence evolution CAO events, particularly role stratosphere, not well understood. Through analysis one episode occurred on 27–31 January 2019 across much US Midwest, this study examined its thermodynamic structure impact stratospheric downward transport using single-field-view (SFOV) satellite products (with...
A hyperspectral bidirectional reflectance (HSBR) model for land surface has been developed in this work. The HSBR includes a very diverse distribution function (BRDF) database with ~40,000 spectra. BRDF is saved as Ross-Li parameters, which can generate spectra at different sensor and solar observation geometries. also provides an improved method generating using multiband satellite measurements. It shown that the reflective spectrum be easily simulated parameters or few preselected...
The Climate Absolute Radiance and Refractivity (CLARREO) Pathfinder (CPF) mission will take Système Internationale (SI)-traceable spectral reflectance measurements of Earth at an unprecedented accuracy 0.3% (k=1). CPF also to support intercalibration other satellite-based sensors. To achieve the desired methodology uncertainty (k=1), need closely match those from target sensors in time, space, angles, wavelength. This paper introduces innovative angular correction method significantly reduce...
A hybrid stream PCRTM-SOLAR model has been proposed for fast and accurate radiative transfer simulation. It calculates the reflected solar (RS) radiances with a coarse way then, help of pre-saved matrix, transforms results to obtain desired high RS spectrum. The methodology demonstrated discrete ordinate (HSDO) (RT) model. HSDO method monochromatic using 4-stream method, where only small number are simulated both larger N-stream (N ≥ 16)discrete RT algorithm. accuracy obtained channel...
Abstract The intercalibration between a broadband and hyperspectral satellite Earth observation system requires the convolution of data with spectral response functions (SRFs) corresponding channels. There are two potential issues associated procedure. First, finite resolution spectrum, that is, deviation from highly accurate line‐by‐line monochromatic radiances, will contribute to errors. magnitude errors depends on SRF shape instrument. This type error has not been well recognized, there...
The Climate Absolute Radiance and Refractivity Observatory (CLARREO) Pathfinder (CPF) consists of an Earthviewing reflected solar (RS) spectrometer that will measure the Earth-reflected radiation from International Space Station with SI-traceable radiometric uncertainty 0.3% (1-sigma). high-accuracy CPF measurements provide in-orbit reference for intercalibrating other spaceflight RS instruments. intercalibration team has been tasked to develop a state-of-the-art approach calibrate shortwave...
The Single Field-of-view Sounder Atmospheric Products (SiFSAP), including ozone (0 <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> ) and carbon monoxide (CO), from CrIS on SNPP have a spatial resolution of about 14 km at nadir. Such high-resolution sounder products enable us to make process-oriented analysis CO emission transport large wildfires as well the 0 production along fire plumes. An SiFSAP Australia's unprecedented in end 2019...
We introduce a novel spectral fingerprinting scheme that can be used to derive long-term atmospheric temperature and water vapor anomalies from hyperspectral infrared sounders such as Cross-track Infrared Sounder (CrIS) Atmospheric (AIRS). It is challenging task climate trends real satellite observations due the difficulty of carrying out accurate cloudy radiance simulations constructing radiometrically consistent radiative kernels. To address these issues, we use principal component based...
Satellite ultraspectral infrared sensors provide key data records essential for weather forecasting and climate change science. The Suomi National Polar-orbiting Partnership (NPP) satellite environmental (EDRs) are retrieved from calibrated radiance or sensor (SDRs). Understanding the accuracy of EDRs is critical. first NPP Calibration/Validation Campaign was conducted during May 2013. NASA high-altitude ER-2 aircraft carrying interferometer sounders such as Airborne Sounder...
Abstract. The single field-of-view (SFOV) sounder atmospheric product (SiFSAP) retrieval algorithm has been developed to address the need retrieve high-spatial-resolution data products from hyper-spectral sounders and ensure radiometric consistency between retrieved properties measured spectral radiances. It is based on an integrated optimal-estimation inversion scheme that processes satellite-based synergistic microwave (MW) infrared (IR) measurements advanced sounders. system utilizes...
Goal: COSMIC Medical, a Vancouver-based open-source volunteer initiative, has designed an accessible, affordable, and aerosol-confining non-invasive positive-pressure ventilator (NIPPV) device, known as the Bubble Helmet (CBH). This device is intended for COVID-19 patients with mild-to-moderate acute respiratory distress syndrome. System Design: CBH composed of thermoplastic polyurethane, which creates flexible neck seal transparent hood. can be connected to wall oxygen, NIPPVs including...
Abstract. The Infrared Atmospheric Sounding Interferometer (IASI) is an ultra-spectral satellite sensor with 8461 spectral channels. IASI spectra contain high information content on atmospheric, cloud, and surface properties. instrument presents a challenge for using thousands of channels in physical retrieval system or Numerical Weather Prediction (NWP) data assimilation system. In this paper we describe method simultaneously retrieving atmospheric temperature, moisture, cloud properties...
Satellite-based hyper-spectral infrared (IR) sensors such as the Atmospheric Infrared Sounder (AIRS), Cross-track (CrIS), and Sounding Interferometer (IASI) cover many methane (CH4) spectral features, including ν1 vibrational band near 1300 cm−1 (7.7 μm); therefore, they can be used to monitor CH4 concentrations in atmosphere. However, retrieving remains a challenge due limited information provided by IR sounder measurements. The required resolve weak absorption lines of is often obscured...
Abstract. The term “hotspot” refers to the sharp increase in reflectance occurring when incident (solar) and reflected (viewing) directions almost coincide backscatter direction. accurate simulation of hotspot directional signatures is important for many remote sensing applications. RossThick–LiSparse–Reciprocal (RTLSR) bidirectional distribution function (BRDF) model widely used radiative transfer simulations, mostly from Maignan–Bréon, but it typically requires large values numerical...