Toward Better Constrained Scattering Models for Natural Ice Crystals in the Visible Region

Xu, Guanglang; Waitz, Fritz; Wagner, Shawn; Nehlert, Franziska; Schnaiter, M.; Järvinen, Emma

doi:10.1029/2022jd037604

Cited by 3 publications

(1 citation statement)

References 66 publications

(122 reference statements)

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“…The MC6 and THM g values are also similar to retrievals based on in‐situ polar nephelometers: Cloud Integrating Nephelometer, PN, and PHIPS (e.g., Järvinen et al., 2018). Some in‐situ measurements even report g values lower than 0.74, which is more comparable to the THM g (Garrett et al., 2005; Xu et al., 2022, 2023). In addition, using 1‐year of collocated MODIS and CALIOP single‐layer thin cirrus observations over ocean, C. Wang et al.…”

Section: Resultsmentioning

confidence: 85%

On the Consistency of Ice Cloud Optical Models for Spaceborne Remote Sensing Applications and Broadband Radiative Transfer Simulations

Ren,

Yang,

Loeb

et al. 2023

JGR Atmospheres

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Aqua satellite Moderate Resolution Imaging Spectroradiometer (MODIS) 1‐km observations are collocated with Clouds and the Earth's Radiant Energy System (CERES) fields of view taken during July 2008 afternoon satellite passes over the equatorial western Pacific Ocean. Radiation simulations are compared with collocated CERES observations to better understand the sensitivity of computed fluxes to two ice cloud broadband radiation parameterization schemes and inferred ice cloud characteristics. In particular, the radiation computational schemes and ice cloud property retrievals are based on two respective ice particle models, the MODIS Collection 6 (MC6) aggregate model and a more microphysically consistent two‐habit model (THM). The simulation results show that both MC6 and THM overestimate the shortwave (SW) and longwave (LW) cloud radiative effects at the top of the atmosphere, as compared to the CERES observations; the difference between the MC6 and THM‐based ice cloud retrievals is too small to compensate for the differences between the two model‐based radiation schemes. Therefore, the present finding suggests that broadband radiative simulations are more sensitive to the radiation parameterization scheme than to the input cloud properties retrieved using the corresponding ice cloud particle optical property model.

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Section: Resultsmentioning

confidence: 85%

On the Consistency of Ice Cloud Optical Models for Spaceborne Remote Sensing Applications and Broadband Radiative Transfer Simulations

Ren,

Yang,

Loeb

et al. 2023

JGR Atmospheres

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Ice crystal morphological complexity and asymmetry parameter: Implications for light scattering measurements

Xu,

Waitz,

Wagner

et al. 2024

Radiation Processes in the Atmosphere and Ocean

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Quantifying the coherent backscatter enhancement of non-spherical particles with discrete dipole approximation

Zhou¹,

Xue²,

Bi³

2023

Opt. Express

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The prevailing backscattering peak associated with the scattering phase function of large non-absorptive particles can be interpreted with the coherent backscatter enhancement (CBE) theory, but has not been explicitly quantified with numerical simulations based on solving Maxwell’s equations. In this paper, representative numerical simulations performed with the discrete-dipole-approximation (DDA) model are used to quantify the effect of CBE on the single-scattering phase function. For each scattering case, the particle volume was divided into multiple thin slices parallel to the incident beam. The dipole polarizations in the j’th slice in response to the incident field of the i’th slice were computed, and then the corresponding contribution to the scattering phase function was calculated. Interference between conjugate terms representing reversible wave paths is constructive at the backscattering direction, which corresponds to the CBE. Subsequently, the contribution of CBE to the scattering phase function was quantified by comparing the electric fields calculated with and without the interference between conjugate terms. Results from these numerical simulations are consistent with conclusions obtained from the CBE theory. The simulations also quantitatively explain why it is difficult to identify a CBE-induced backscattering peak for the phase function of small particles and strong-absorptive particles.

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Toward Better Constrained Scattering Models for Natural Ice Crystals in the Visible Region

Cited by 3 publications

References 66 publications

On the Consistency of Ice Cloud Optical Models for Spaceborne Remote Sensing Applications and Broadband Radiative Transfer Simulations

On the Consistency of Ice Cloud Optical Models for Spaceborne Remote Sensing Applications and Broadband Radiative Transfer Simulations

Ice crystal morphological complexity and asymmetry parameter: Implications for light scattering measurements

Quantifying the coherent backscatter enhancement of non-spherical particles with discrete dipole approximation

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