Study of the effects of phytoplankton morphology and vertical profile on lidar attenuated backscatter and depolarization ratio

Stegmann, Patrick G.; Sun, Bingqiang; Ding, Jiachen; Yang, Ping; Zhang, Xiaodong

doi:10.1016/j.jqsrt.2018.12.009

Cited by 9 publications

(4 citation statements)

References 46 publications

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“…In Koestner et al (2020), from the analysis of ocean water samples in the San Diego area, ψ max ranged from 91°to 98°with a mean value of 94°. The right-shifted tendency in DoLP is also observed in the simulated DoLP in Modeling, and in other single scattering simulations of the DoLP of marine-like particulates (Lotsberg and Stamnes 2010;Xu et al, 2017;Stegmann et al, 2019). At field sites ES and SBC, DoLP max decreases with increasing depth.…”

Section: Measured Particulate Dolp Angular Shapesupporting

confidence: 69%

“…Accurate and meaningful simulations of the full Mueller matrix for marine particulates have also progressed slowly due to the large size and complex shape and composition of marine particulates (Zhai et al, 2013;Bi and Yang 2015;Sun et al, 2016;Xu et al, 2017;Stegmann et al, 2019;Zhai et al, 2020). An associated challenge is vector radiative transfer simulations for the entire ocean and atmospheric system (Zhai et al, 2010;Xu et al, 2016;Stamnes et al, 2018;Chowdhary et al, 2019;Ding et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The term "vector" comes from the inclusion of the full Stokes vector and the entire 4-by-4 Mueller matrix in the RT code instead of just the first element of the Stokes vector. The treatment of the marine particulate Mueller matrix in vRT models generally fall into two categories: 1) based on in situ measurements (Kokhanovsky 2003;Zhai et al, 2010;You et al, 2011aYou et al, , 2011bXu et al, 2016); and 2) numerically constructed with Lorenz-Mie or non-spherical particle single scattering models (Chowdhary et al, 2012;Ibrahim et al, 2012;Stegmann et al, 2019). As mentioned, in situ measurements are scarce and the Voss and Fry "ocean average" matrix (Voss and Fry 1984) has been typically employed (Kokhanovsky 2003;Zhai et al, 2010;Xu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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The Degree of Linear Polarization for Suspended Particle Fields from Diverse Natural Waters

Zhai

Twardowski

2021

Front. Remote Sens.

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The Degree of Linear Polarization (DoLP) for unperturbed particle fields in waters from six diverse regions around the globe was measured with the custom Multi-Angle Scattering Optical Tool (MASCOT). DoLP here is defined as the ratio of two elements of Mueller scattering matrix, i.e., -M12/M11. Field sites covered inland waters, coastal oceans and open oceans, including both ocean color Case I and II water types. The angular shape of the measured particulate DoLP was analyzed in detail for each field site and for the ensemble average. Three parameters used to quantitatively characterize DoLP shape were the symmetry with respect to 90°, peak magnitude, and peak angle of measured DoLP angular curve. Vertical profiles of particulate DoLP were analyzed with maximum recorded depth of 111 m. Converse to Rayleigh scatterers, we found measured particulate DoLPs were not symmetric with respect to 90°. On average, DoLP peaks were shifted slightly toward larger angles, with most falling between estimated values of 90° and 95°. All particulate DoLP peak magnitudes generally varied within [0.6, 0.9]. Lorenz-Mie (homogeneous sphere) light scattering theory was used to construct a new inversion for bulk particulate refractive index from a lookup table based on DoLP and spectral attenuation measurements. We compared the Mie-DoLP-based particulate refractive index retrieval with the backscattering-based model from (Twardowski et al., J. Geophys. Res., 2001, 106(C7), 14,129–14,142). Particulate refractive index retrieved with the two models were in some cases comparable. At two of the six field sites we saw good agreement between the two models, whereas at another two field sites we observed large discrepancies between the two models. Further investigation on the choice of the modeled particle shapes and compositions may improve this retrieval approach. Results are compatible with previous studies on DoLPs in natural waters and comprehensive observations are provided on the particulate DoLP angular shape, vertical profile and global distributions that are important for future vector radiative transfer simulations. This study is relevant to future PACE polarimeters and associated remote retrieval of oceanic particle composition using polarimetry.

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Section: Measured Particulate Dolp Angular Shapesupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Degree of Linear Polarization for Suspended Particle Fields from Diverse Natural Waters

Zhai

Twardowski

2021

Front. Remote Sens.

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“…The technique was later extended to detection of fish schools [59] and subsurface layers [60]. The treatment of polarization in oceanographic lidar was has been considered for oceanic water [61], for fish school detection [62], and for various idealized particle models [63]. Other recent work has considered methods to increase the speed of Monte-Carlo calculations [64,65], and application of Monte-Carlo to HSRL [66].…”

Section: Theoretical Lidar Investigationsmentioning

confidence: 99%

Lidar remote sensing of the aquatic environment: invited

Churnside¹,

Shaw²

2020

Appl. Opt.

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This paper is a review of lidar remote sensing of the aquatic environment. The optical properties of seawater relevant to lidar remote sensing are described. The three main theoretical approaches to understanding the performance of lidar are considered (time-dependent radiative transfer equation, Monte Carlo simulations, and quasi-single scattering assumption). Basic lidar instrument design considerations are presented, and examples of lidar studies from surface vessels, aircraft, and satellite are given.

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Noise reduction for ground-based atmospheric detection lidar: A universal method based on signal segmentation and reconstruction

Shi

et al. 2021

Journal of Quantitative Spectroscopy and Radiative Transfer

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Study of the effects of phytoplankton morphology and vertical profile on lidar attenuated backscatter and depolarization ratio

Cited by 9 publications

References 46 publications

The Degree of Linear Polarization for Suspended Particle Fields from Diverse Natural Waters

The Degree of Linear Polarization for Suspended Particle Fields from Diverse Natural Waters

Lidar remote sensing of the aquatic environment: invited

Noise reduction for ground-based atmospheric detection lidar: A universal method based on signal segmentation and reconstruction

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