A5024027166- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Calibration and Measurement Techniques
- Solar Radiation and Photovoltaics
- Meteorological Phenomena and Simulations
- Electromagnetic Simulation and Numerical Methods
- Precipitation Measurement and Analysis
- Electromagnetic Scattering and Analysis
- Aeolian processes and effects
- Photonic Crystals and Applications
- Cryospheric studies and observations
- Random lasers and scattering media
- Orbital Angular Momentum in Optics
- Surface Roughness and Optical Measurements
- Climate variability and models
- Infrared Target Detection Methodologies
- Remote Sensing and LiDAR Applications
- Advanced Optical Sensing Technologies
- Soil Moisture and Remote Sensing
- Near-Field Optical Microscopy
- Plasmonic and Surface Plasmon Research
- Icing and De-icing Technologies
- Photonic and Optical Devices
Science Systems and Applications (United States)
2013-2023
Langley Research Center
2008-2022
Northeast Electric Power University
2018-2022
Jilin University of Finance and Economics
2015-2021
Kyung Hee University
2018-2021
Jilin Business and Technology College
2015-2020
University at Albany, State University of New York
2020
St Johns River State College
2014
Science and Technology Corporation (United States)
2013
Jilin Meteorological Bureau
2013
An accurate parameterization is presented for the infrared radiative properties of cirrus clouds. For single-scattering calculations, a composite scheme developed randomly oriented hexagonal ice crystals by comparing results from Mie theory, anomalous diffraction theory (ADT), geometric optics method (GOM), and finite-difference time domain technique. This employs linear combination ADT, GOM, which wide range size parameters. Following approach Q. Fu, extinction coefficient, absorption...
The CALIOP depolarization measurements, combined with backscatter intensity are effective in discriminating between water clouds and ice clouds. same measurements can also be used for estimating liquid content information. Using cloud temperature information from the collocated infrared imaging radiometer paths MODIS this study compiles global statistics of occurrence frequency, content, path, their dependence. For temperatures −40°C 0°C, phase fractions significantly higher than ones...
Abstract The current cloud thermodynamic phase discrimination by Cloud-Aerosol Lidar Pathfinder Satellite Observations (CALIPSO) is based on the depolarization of backscattered light measured its lidar [Cloud-Aerosol with Orthogonal Polarization (CALIOP)]. It assumes that from ice crystals depolarizing, whereas water clouds, being spherical, result in minimal depolarization. However, because relationship between CALIOP field view (FOV) and large distance satellite clouds frequent presence...
The Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission will provide a calibration laboratory in orbit for the purpose of accurately measuring attributing climate change. CLARREO measurements establish new change benchmarks with high absolute radiometric accuracy statistical confidence across wide range essential variables. CLARREO's inherently be verified traceable on to Système Internationale (SI) units. established by critical assessing changes Earth system model...
Analytic equations are developed for the single-scattering properties of a spherical particle embedded in an absorbing medium, which include absorption, scattering, extinction efficiencies, scattering phase function, and asymmetry factor. We derive absorption efficiencies by using near field at surface particle, avoids difficulty obtaining based on optical theorem when far is used. Computational results demonstrate that medium significantly affects light sphere.
A three-dimensional finite-difference time-domain (FDTD) program has been developed to provide a numerical solution for light scattering by nonspherical dielectric particles. The perfectly matched layer (PML) absorbing boundary condition (ABC) is used truncate the computational domain. As result of using PML ABC, present FDTD requires much less computer memory and CPU time than those that use traditional truncation techniques. For spheres with particle-size parameters as large 40, extinction...
Abstract. Global satellite observations of lidar backscatter measurements acquired by the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) mission collocated sea surface wind speed data from Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E), are used to investigate relation between driven wave slope variance speed. The new – established this study is similar linear Cox-Munk (1954) log-linear Wu (1972, 1990) larger than 7 m/s 13.3 m/s,...
Abstract Observations from the Clouds and Earth’s Radiant Energy System (CERES), Moderate Resolution Imaging Spectroradiometer (MODIS), Multiangle (MISR), Sea-Viewing Wide-Field-of-View Sensor (SeaWiFS) between 2000 2005 are analyzed in order to determine if these data meeting climate accuracy goals recently established by community. The focus is primarily on top-of-atmosphere (TOA) reflected solar radiances radiative fluxes. Direct comparisons of nadir CERES, MODIS, MISR aboard Terra...
[1] Subvisual cirrus clouds that are defined as those whose optical thickness is less than ∼0.3 found in ∼50% of global observations. Passive remote-sensing instruments, such the Moderate Resolution Imaging Spectroradiometer (MODIS), generally fail to detect these optically thin clouds. The launch NASA's Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellite provides an unprecedented ability cloud layers globally. Also, Clouds Earth's Radiant Energy System...
This paper examines a number of commonly used methods for the calculation scattering and absorption properties nonspherical ice crystals at thermal infrared wavelengths. It is found that, randomly oriented particles, Mie theory using equivalent spheres tends to overestimate efficiency while anomalous diffraction (ADT) geometric optics method (GOM) tend underestimate it. The not sensitive particle shape when size parameter large. Herein composite scheme that valid particles with wide range...
Abstract The Moderate Resolution Imaging Spectroradiometer (MODIS) represents our most advanced system for long‐term, global observations of cloud optical depth ( τ ) and drop effective radius Re ). Here we show that the both zonal means (1) MODIS‐retrieved (2) retrieved from Multi‐angle (MISR) using as input exhibit a large, local negative bias in rainbow scattering direction relative to adjacent angles oceanic water clouds. Using radiative transfer simulations, demonstrate these biases are...
Sunlight contamination dominates the backscatter noise in space-based lidar measurements during daytime. The background scattered sunlight is highly variable and dependent upon surface atmospheric albedo. contribution to increases over land snow surfaces where albedos are high thus overwhelm from optically thin constituents like aerosols clouds. In this work, we developed a novel remote sensing concept that potentially can eliminate induced noise. new requires: (1) transmitted laser light...
A neural-network algorithm that uses CALIPSO lidar measurements to infer droplet effective radius, extinction coefficient, liquid-water content, and number concentration for water clouds is described assessed. These results are verified against values inferred from High-Spectral-Resolution Lidar (HSRL) Research Scanning Polarimeter (RSP) made on an aircraft flew under CALIPSO. The global cloud microphysical properties derived 14+ years of measurements, the sizes compared corresponding MODIS...
Snow is a crucial element in the Earth’s system, but snow depth and mass are very challenging to be measured globally. Here, we provide theoretical foundation for deriving directly from space-borne lidar (ICESat-2) multiple scattering measurements first time. First, based on Monte Carlo radiative transfer simulations of ICESat-2 532-nm laser light propagation snow, find that backscattering path length follows Gamma distribution. Next, derive three simple analytical equations compute average,...
The three-dimensional (3-D) finite-difference time-domain (FDTD) technique has been extended to simulate light scattering and absorption by nonspherical particles embedded in an absorbing dielectric medium. A uniaxial perfectly matched layer (UPML) boundary condition is used truncate the computational domain. When computing single-scattering properties of a particle medium, we derive including phase functions, extinction, efficiencies using volume integration internal field. Mie solution for...
Vertical distribution of phytoplankton is crucial for assessing the trophic status and primary production in inland waters. However, there sparse information about vertical due to lack sufficient measurements. Here, we report, best our knowledge, first Mie-fluorescence-Raman lidar (MFRL) measurements continuous chlorophyll a (Chl-a) profiles as well their parametrization water. The lidar-measured Chl-a during several experiments showed good agreement with situ data. A case study verified...
The formulation of the finite-difference time-domain (FDTD) approach is presented in framework its potential applications to in-vivo flow cytometry based on light scattering. consideration focused comparison scattering by a single biological cell alone controlled refractive-index matching conditions and cells labeled gold nanoparticles. optical schematics including phase contrast (OPCM) microscopy as prospective modality for also analyzed. validation FDTD simulation may open up new avenue...