A5101588512- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Calibration and Measurement Techniques
- Optical Polarization and Ellipsometry
- Remote Sensing in Agriculture
- Planetary Science and Exploration
- Orbital Angular Momentum in Optics
- Air Quality Monitoring and Forecasting
- Radiative Heat Transfer Studies
- Air Quality and Health Impacts
- Remote-Sensing Image Classification
- Solar and Space Plasma Dynamics
- Aeolian processes and effects
- Astro and Planetary Science
- Geochemistry and Geologic Mapping
- Cryospheric studies and observations
- Electrowetting and Microfluidic Technologies
- Remote Sensing and Land Use
- Field-Flow Fractionation Techniques
- Marine and coastal ecosystems
- Wind and Air Flow Studies
- Precipitation Measurement and Analysis
- Water Quality Monitoring Technologies
University of Oklahoma
2019-2024
Jet Propulsion Laboratory
2011-2021
The University of Queensland
2021
Chongqing University
2021
California Institute of Technology
2019
Universitat Politècnica de Catalunya
2018
University of California, Los Angeles
2012-2013
Gansu Agricultural University
2012
Institut National des Sciences Appliquées Rouen Normandie
2007-2011
Centre de Gestion Scientifique
2011
Polarimetry is one of the most promising types remote sensing for improved characterization atmospheric aerosol. Indeed, aerosol particles constitute a highly variable component characterized by large number parameters describing particle sizes, morphologies (including shape and internal structure), absorption scattering properties, amounts, horizontal vertical distribution, etc. Reliable monitoring all these very challenging, therefore effects on climate environment are considered to be...
Advanced inversion Multi-term approach utilizing multiple a priori constraints is proposed. The used as base for the first unified algorithm GRASP that applicable to diverse remote sensing observations and retrieving variety of atmospheric properties. utilization demonstrated.
Abstract. The total effect of aerosols, both directly and on cloud properties, remains the biggest source uncertainty in anthropogenic radiative forcing climate. Correct characterization intensive aerosol optical particularly conditions where absorbing is present, a crucial factor quantifying these effects. southeast Atlantic Ocean (SEA), with seasonal biomass burning smoke plumes overlying mixing persistent stratocumulus deck, offers an excellent natural laboratory to make observations...
SPECIALTY GRAND CHALLENGE article Front. Remote Sens., 24 February 2021 | https://doi.org/10.3389/frsen.2021.619818
Abstract. The Airborne Multiangle SpectroPolarimetric Imager (AirMSPI) is an eight-band (355, 380, 445, 470, 555, 660, 865, 935 nm) pushbroom camera, measuring polarization in the and 865 nm bands, mounted on a gimbal to acquire multiangular observations over ±67° along-track range. instrument has been flying aboard NASA ER-2 high altitude aircraft since October 2010. AirMSPI employs photoelastic modulator-based polarimetric imaging technique enable accurate measurements of degree angle...
The Plankton, Aerosol, Clouds, ocean Ecosystem (PACE) mission presents new opportunities and challenges in applying observations of two complementary multi-angle polarimeters for the space-based retrieval global aerosol properties. Aerosol remote sensing from radiometric-only enables characterization to a greater degree than single-view radiometers, as demonstrated by nearly decades heritage instruments. Adding polarimetry allows optical depth, Angstrom exponent, parameters size...
Abstract. An optimization approach has been developed for simultaneous retrieval of aerosol properties and normalized water-leaving radiance (nLw) from multispectral, multiangular, polarimetric observations over ocean. The main features the method are (1) use a simplified bio-optical model to estimate nLw, followed by an empirical refinement within specified range improve its accuracy; (2) improved algorithm convergence stability applying constraints on spatial smoothness loading Chlorophyll...
Abstract The Airborne Multiangle SpectroPolarimetric Imager (AirMSPI) has been flying aboard the NASA ER‐2 high‐altitude aircraft since October 2010. In step‐and‐stare operation mode, AirMSPI acquires radiance and polarization data in bands centered at 355, 380, 445, 470*, 555, 660*, 865*, 935 nm (* denotes polarimetric bands). imaged area covers about 10 km by 11 is typically observed from nine viewing angles between ±66° off nadir. For a simultaneous retrieval of aerosol properties surface...
Ocean color remote sensing is an important tool to monitor water quality and biogeochemical conditions of ocean.Atmospheric correction, which obtains water-leaving radiance from the total measured by satellite-borne or airborne sensors, remains a challenging task for coastal waters due complex optical properties aerosols ocean waters.In this paper, we report research algorithm on aerosol retrieval with emphasis waters, uses coupled atmosphere radiative transfer model fit polarized...
Abstract. In this paper, we present aerosol retrieval results from the ACEPOL (Aerosol Characterization Polarimeter and Lidar) campaign, which was a joint initiative between NASA SRON – Netherlands Institute for Space Research. The campaign took place in October–November 2017 over western part of United States. During six different instruments were deployed on ER-2 high-altitude aircraft, including four multi-angle polarimeters (MAPs): SPEX airborne, Airborne Hyper Angular Rainbow (AirHARP),...
NASA's Plankton, Aerosol, Clouds, ocean Ecosystem (PACE) satellite mission is scheduled to launch in 2022, with the Ocean Color Instrument (OCI) on board. For first time reflected sunlight from Earth across a broad spectrum ultraviolet (UV: 350 nm) short wave infrared (SWIR: 2260 will be measured single instrument at 1 km spatial resolution. While seven discrete bands represent SWIR, nm 890 continuously covered spectral resolution of 5 nm. OCI thus combine (and an enhanced for UV) heritage...
Accurate characterization of surface reflection is essential for retrieval aerosols using downward-looking remote sensors. In this paper, observations from the Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI) are used to evaluate a polarized bidirectional reflectance distribution function (PBRDF) model. GroundMSPI an eight-band spectropolarimetric camera mounted on rotating gimbal acquire pushbroom imagery outdoor landscapes. The uses very accurate photoelastic-modulator-based...
This report summarizes the research frontiers on radiative transfer (RT) in coupled atmosphere-atmosphere systems to enable new science and specifically support simulations interpretations of remote sensing observations from upcoming Plankton, Aerosol, Cloud ocean Ecosystem (PACE) mission. Given that (i) there is a multitude atmospheric oceanic constituents at any given moment each exhibit large variety physical chemical properties (ii) light-matter interaction can occur various ways...
Aerosol retrieval algorithms used in conjunction with remote sensing are subject to ill-posedness. To mitigate non-uniqueness, extra constraints (in addition observations) valuable for stabilizing the inversion process. This paper focuses on imposition of an empirical correlation constraint retrieved aerosol parameters. reflects dependency between different parameters, thereby reducing number degrees freedom and enabling accelerated computation radiation fields associated neighboring pixels....
Abstract An optimization algorithm is developed to retrieve liquid water cloud properties including optical depth (COD), droplet size distribution and top height (CTH), above‐cloud aerosol (AOD), single‐scattering albedo, microphysical from sweep‐mode observations by Jet Propulsion Laboratory's Airborne Multiangle SpectroPolarimetric Imager (AirMSPI) instrument. The retrieval composed of three major steps: (1) initial estimate the mean across entire image 80–100 km along track 10–25...
Abstract This study attempts to infer aerosol vertical structure in the urban boundary layer using passive hyperspectral measurements. A spectral sorting technique is developed retrieve total optical depth (AOD) and effective height (ALH) from measurements 1.27‐μm oxygen absorption band by mountaintop Fourier Transform Spectrometer at California Laboratory for Atmospheric Remote Sensing instrument (1,673 m above sea level) overlooking LA basin. Comparison AOD Aerosol Robotic Network...
With the rapid development of Large Language Models (LLMs), numerous Reinforcement Learning from Human Feedback (RLHF) algorithms have been introduced to improve model safety and alignment with human preferences. These can be divided into two main frameworks based on whether they require an explicit reward (or value) function for training: actor-critic-based Proximal Policy Optimization (PPO) alignment-based Direct Preference (DPO). The mismatch between DPO PPO, such as DPO's use a...
Observations from the Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI) are used to relate angle of linear polarization (AoLP) measurements material properties and illumination conditions in sunlit outdoor environments. GroundMSPI is a push-broom spectropolarimetric camera with an uncertainty degree (DoLP) ±0.005. This polarimetric accuracy yields useful AoLP images even when DoLP less than 0.02. reported respect dependency on surface texture, orientation, albedo, conditions....
Abstract. In the fall of 2017, an airborne field campaign was conducted from NASA Armstrong Flight Research Center in Palmdale, California, to advance remote sensing aerosols and clouds with multi-angle polarimeters (MAP) lidars. The Aerosol Characterization Polarimeter Lidar (ACEPOL) jointly sponsored by Netherlands Institute for Space (SRON). Six instruments were deployed on ER-2 high-altitude aircraft. Four MAPs: Airborne Hyper Angular Rainbow (AirHARP), Multiangle SpectroPolarimetric...
The Debye series is developed for scattering of light by a homogeneous nonspherical particle to interpret the angular dependence scattered intensity in terms various physical processes. In contrast previously several regularly shaped particles that mirror orthogonal curvilinear coordinate system where variable-separation method can be applied, we develop and verify coordinate-independent way using extended boundary condition method. Verification computations are made an oblate spheroidal...
We formulate a new model for transport in stochastic media with long-range spatial correlations where exponential attenuation (controlling the propagation part of transport) becomes power law. Direct transmission over optical distance τ(s), fixed physical s, thus (1 + τ(s)/a)− a, standard decay recovered when → ∞. Atmospheric turbulence phenomenology fluctuating properties rationalizes this switch. Foundational equations generalized are stated integral form d = 1, 2, 3 dimensions. A...