Simultaneous retrieval of aerosol and ocean properties from PACE HARP2 with uncertainty assessment using cascading neural network radiative transfer models

Atmospheric measurement techniques, Journal Year: 2023, Volume and Issue: 16(23), P. 5863 - 5881

Published: Dec. 7, 2023

Abstract. The University of Maryland, Baltimore County (UMBC) Hyper-Angular Rainbow Polarimeter (HARP2) will be on board NASA's Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission, scheduled for launch in January 2024. In this study we systematically evaluate the retrievability and uncertainty aerosol parameters from HARP2 multi-angle polarimeter (MAP) measurements. To reduce computational demand MAP-based retrievals maximize data processing throughput, developed improved neural network (NN) forward models spaceborne measurements over a coupled atmosphere system within FastMAPOL retrieval algorithm. end, cascading scheme is implemented FastMAPOL, which leverages series NN varying size, speed, accuracy to optimize performance. Two sets are used reflectance polarization, respectively. A full day global synthetic was generated test various including microphysical optical properties, layer height, surface wind chlorophyll concentration. assess quality, pixel-wise uncertainties were derived error propagation evaluated against difference between truth based Monte Carlo method. We found that fine-mode properties can retrieved well data, though coarse-mode more uncertain. Larger associated with reduced number available viewing angles, typically occur near scan edge instrument. Results performance assessment demonstrate algorithm viable approach operational application after PACE launch.

Language: Английский

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Advanced simulation and measurement of skylight polarization patterns across distinct aerosol type environments

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 967, P. 178768 - 178768

Published: Feb. 12, 2025

Language: Английский

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Simulation of Circular Dichroism in a Three-Layer Complementary Chiral Metasurface

Photonics, Journal Year: 2025, Volume and Issue: 12(3), P. 228 - 228

Published: March 3, 2025

Circularly polarized light (CPL) detection sensors have significant potential for applications in quantum communication and biosensing. In this work, we propose a three-layer complementary chiral metasurface (TCCM) on-chip integration the mid-infrared range (2–6 μm). The TCCM consists of an Al nanorod layer, SiO2 dielectric nanoslit with strong circular dichroism (CD) achieved through symmetry breaking inclined rectangular rods. Finite-difference time-domain (FDTD) simulation results demonstrate that electric fields excited by left circularly (LCP) right (RCP) exhibit different bonding antibonding modes, which explains CD mechanism. response spectral tunability are influenced angle length Through optimization structural parameters, maximum value 0.72 is achieved. Compared to traditional multilayer metasurfaces, simplifies fabrication process. These findings provide valuable insights practical strategies development compact infrared devices, particularly optical communication, sensing, full-Stokes polarization detection.

Language: Английский

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A 13-year space-based climatological evolution of desert dust aerosols in the Middle East and North Africa regions observed by the CALIPSO

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 948, P. 174793 - 174793

Published: July 15, 2024

Language: Английский

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Measurement of Circular Intensity Differential Scattering (CIDS) from Single Optically Trapped Biological Particles

Journal of Quantitative Spectroscopy and Radiative Transfer, Journal Year: 2024, Volume and Issue: 330, P. 109244 - 109244

Published: Nov. 1, 2024

Language: Английский

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Rapid bioaerosol detection by measuring circular intensity differential scattering (CIDS) from single flowing through particle

Aerosol Science and Technology, Journal Year: 2023, Volume and Issue: 58(1), P. 91 - 98

Published: Nov. 7, 2023

ABSTRACTWe present an advanced optical method to measure the phase function of circular intensity differential scattering (CIDS), i.e., normalized Mueller matrix element -S14/S11, from individual single flowing through aerosol particles. Here, a 32-anode photomultiplier tube and its associated electronics, combined with elliptical reflector, were used record functions, when particle illuminated by left-handed right-handed polarization laser beam around focus reflector successively. The new design does not need lock-in amplifier, modulator, rotating goniometer as traditional setup. It can reach detection ability maximum rate 50,000 particle/sec. CIDS functions tryptophan particles, polystyrene latex microspheres, aggregates Escherichia coli, Bacillus subtilis spores, Yersinia rohdei, bacteriophage MS2 measured, results showed that this has rapidly discriminate between bioaerosol non-bioaerosol particles.Keywords: Circular (CIDS)Mueller -S14/S11 Bioaerosol particlesChiralitySpiralElastic light scatteringScattering functionDisclaimerAs service authors researchers we are providing version accepted manuscript (AM). Copyediting, typesetting, review resulting proofs will be undertaken on before final publication Version Record (VoR). During production pre-press, errors may discovered which could affect content, all legal disclaimers apply journal relate these versions also.

Language: Английский

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Light scattering from spiral particles

Journal of Quantitative Spectroscopy and Radiative Transfer, Journal Year: 2023, Volume and Issue: 298, P. 108494 - 108494

Published: Jan. 18, 2023

Language: Английский

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Skylight VIS-NIR Polarization Radiometer: Design, Calibration, and Measurement

IEEE Sensors Journal, Journal Year: 2024, Volume and Issue: 24(6), P. 7700 - 7710

Published: Feb. 5, 2024

Skylight polarization radiation measurement has important application value in atmospheric remote sensing, aerosol retrieval, and navigation. Traditional instruments like the Cimel CE318, while widely used AERONET SONET networks, suffer from limitations, such as long time resolution, limited modes, incomplete calibration. Addressing these gaps, this article designs implements a VIS-NIR Polarization Radiometer (SVNPR) for precise spectral measurements, covering range of 400–1100 nm. The SVNPR, based on ground-based passive, robust, constant-temperature, multiscan features, is particularly suited field deployment. Furthermore, comprehensive feasible indoor calibration scheme proposed, including calibration, radiometric polarimetric Finally, measurements were conducted, experimental results show that SVNPR can achieve effective accurate skylight practical applications. calibrated instrument showed good consistency with CE318-DP, mean absolute deviation (MAD) root square error (RMSE) both within 0.005.

Language: Английский

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Inversion Model of Nonspherical Aerosol Particle Size Distribution Based on Tikhonov’s Regularization With the PSO-GA Algorithm

IEEE Transactions on Geoscience and Remote Sensing, Journal Year: 2023, Volume and Issue: 61, P. 1 - 14

Published: Jan. 1, 2023

Language: Английский

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Unifying radiative transfer models in computer graphics and remote sensing, Part II: A differentiable, polarimetric forward model and validation

Journal of Quantitative Spectroscopy and Radiative Transfer, Journal Year: 2023, Volume and Issue: 315, P. 108849 - 108849

Published: Dec. 1, 2023

The constellation of Earth-observing satellites continuously collects measurements scattered radiance, which must be transformed into geophysical parameters in order to answer fundamental scientific questions about the Earth. Retrieval these requires highly flexible, accurate, and fast forward inverse radiative transfer models. Existing models used by remote sensing community are typically accurate fast, but sacrifice flexibility assuming atmosphere or ocean is composed plane-parallel layers. Monte Carlo can handle more complex scenarios such as 3D spatial heterogeneity, relatively slower. We propose looking computer graphics for inspiration improve statistical efficiency explore new approaches sensing. In Part 2 this work, we demonstrate that capable sufficient accuracy extending Mitsuba 3, a modeling framework recently developed community, simulate simple atmosphere-ocean systems show our achieving error on par with codes currently benchmark results.

Language: Английский

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