The Radiative Effect on Cloud Microphysics from the Arctic to the Tropics

Zeng, Xiping; Heymsfield, Andrew J.; Ulanowski, Zbigniew; Neely, Ryan R.; Li, Xiaowen; Gong, Jie; Wu, Dong L.

doi:10.1175/bams-d-21-0039.1

Cited by 2 publications

(1 citation statement)

References 59 publications

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“…Moreover we shall consider the transfer in the limit of short wavelength compared to the crystal dimensions, and therefore assume that Q abs ≈ 1 (Roach 1976;Liou 2002). It is convenient to express the radiative infrared ratio 𝜂 as (Zeng 2008;Zeng et al 2022):…”

Section: Radiative Transfermentioning

confidence: 99%

Two-Dimensional Dynamics of Ice Crystal Parcels in a Cirrus Uncinus

Berton

2023

Tellus A: Dynamic Meteorology and Oceanography

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A simple 2D non-stationary parcel model has been elaborated by coupling kinematics and microphysics of ice crystals, for the purpose of retrieving realistic trajectories in a cirrus uncinus, with a hooked-shape head or cap, a trail or virga, and observed lifetimes. Prescribed kinematics and ambient physics includes vertical profiles of horizontal winds and updraft, and of air temperature and humidity. Modelled microphysics combines mass variation by deposition/sublimation of water vapour, radiative transfer and ventilation due to friction with ambient air. Upon changing the altitude of the updraft base, other parameters being unchanged, two distinct regimes of motions are found: setting the base at an altitude of 10 km yields a steady, non-oscillatory motion, with a hooked cap and a tail, typical of a cirrus uncinus, whereas fixing the base at a lower altitude (7-9 km), yields a self-sustained damped oscillatory motion with a long time period (7-10 hours) and a long wavelength (70-200 km), depending on supersaturation level and radiative conditions. This latter phenomenon may be related to the turrets occurring with "long-lasting" cirrus or to the Mesoscale Uncinus Complex (MUC) reported in published works. The sensitivity to the ice crystal size is analysed in order to estimate the spreading of trajectories, and the impact of radiative transfer is examined on the oscillatory regime at the light of three contrasting examples. A simple analytic model with kinematics and constant updraft is aimed at an outline of salient features and derivation of characteristic time-and spatial scales of the phenomena.

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Section: Radiative Transfermentioning

confidence: 99%

Two-Dimensional Dynamics of Ice Crystal Parcels in a Cirrus Uncinus

Berton

2023

Tellus A: Dynamic Meteorology and Oceanography

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Parameterization and Explicit Modeling of Cloud Microphysics: Approaches, Challenges, and Future Directions

et al. 2023

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Cloud microphysical processes occur at the smallest end of scales among cloud-related processes and thus must be parameterized not only in large-scale global circulation models (GCMs) but also in various higher-resolution limited-area models such as cloud-resolving models (CRMs) and large-eddy simulation (LES) models. Instead of giving a comprehensive review of existing microphysical parameterizations that have been developed over the years, this study concentrates purposely on several topics that we believe are understudied but hold great potential for further advancing bulk microphysics parameterizations: multi-moment bulk microphysics parameterizations and the role of the spectral shape of hydrometeor size distributions; discrete vs “continuous” representation of hydrometeor types; turbulence-microphysics interactions including turbulent entrainment-mixing processes and stochastic condensation; theoretical foundations for the mathematical expressions used to describe hydrometeor size distributions and hydrometeor morphology; and approaches for developing bulk microphysics parameterizations. Also presented are the spectral bin scheme and particle-based scheme (especially, super-droplet method) for representing explicit microphysics. Their advantages and disadvantages are elucidated for constructing cloud models with detailed microphysics that are essential to developing processes understanding and bulk microphysics parameterizations. Particle-resolved direct numerical simulation (DNS) models are described as an emerging technique to investigate turbulence-microphysics interactions at the most fundamental level by tracking individual particles and resolving the smallest turbulent eddies in turbulent clouds. Outstanding challenges and future research directions are explored as well.

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The Radiative Effect on Cloud Microphysics from the Arctic to the Tropics

Cited by 2 publications

References 59 publications

Two-Dimensional Dynamics of Ice Crystal Parcels in a Cirrus Uncinus

Two-Dimensional Dynamics of Ice Crystal Parcels in a Cirrus Uncinus

Parameterization and Explicit Modeling of Cloud Microphysics: Approaches, Challenges, and Future Directions

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